Can you get it to idle at anything less than 1500 on the screws? Rich H DOC 365 VIN 1274 > -----Original Message----- > From: doc-uk@xxxxxxxxxxxxxxx [mailto:doc-uk@xxxxxxxxxxxxxxx] On Behalf Of > blackaddertoo > Sent: 19 January 2006 02:28 > To: doc-uk@xxxxxxxxxxxxxxx > Subject: [doc] Re: re still doesn't idle ok > > Hi > > thanx Mike and Nick and anyone else who've helped. > > i live near wolverhampton. > > a good idea to drive...but...is not yet mot'd/registered. > i know i could book her in then drive to the test station but i have > to do the track rod ends (bolts are rusty and want to make sure they > are safe) > i need a front screen (but that could wait till after an mot run. > > but main part i need a small section of frame welding, on passenger > side by fuel tank. > tank has got to come out again. > > i will probably run the last checks on the coil feed, and if that > does not work, readjust the screws and back out the garage and warm > up (extinguisher at ready as first time for 12 years) > > i may also put 12v across the idle motor to make it shut, then > reconnect and see if it reopens. > > i also wondered if i am looking in the wrong place for the fault, as > obviously the idle motor feeds the air down the bypass brass pipe, > whereas the screws feed it though the main manifold inlets. > > so is my bypass pipe ok ( i have removed and replaced the seal) > > i also have not tried to start while holding the flap down a touch > (i think this enriches the mixture???) > > thanx for the help, and believe it or not i enjoy the challenge of > working on the car. > > Regards > > Steve > > > > --- In doc-uk@xxxxxxxxxxxxxxx, "Mike Bosworth" <mike.bosworth@xxxx> > wrote: > > > > Hi Steve > > > > If your car idles 'ok 'with the brass screw method and is ok to > > drive ,then taking it for a real good run is going to help, > > especially if its been sat some time like it appears to have been. > > > > At the end of this run how see how well the car has performed and > > run, does it smell like its overfueling, missing, poor > acceleration > > etc etc, also an exhaust gas analyzer will give you a good > indication > > of how well the car is set up mixture wise, if thats way off its > not > > going to help for starters, but as has been previously said, dont > > start fiddling with the mixture screw willy nilly ( now theres a > > phrase for you :) ) > > > > Take it for a real good drive and let us know how it goes. If it > goes > > well then at least you have narrowed it down. > > > > I agree with all Nick is saying, and unfortunatly in this instance > > there is only so much help people can give without actually seeing > > the car, but we will keep trying are there any other owners near > by > > to you? ... > > > > > > Kind Regards > > > > Mike > > #2001 > > > > > > > however i cannot understand why the car idles with the brass > screws > > > adjusted. > > > perhaps i need to see if the car warms up fully and drives ok > that > > > way? > > > thanx again for your assistance. > > > > > > Regards > > > > > > Steve > > > > > > > > > > > > > > > --- In doc-uk@xxxxxxxxxxxxxxx, Nick Tomlinson > > > wrote: > > > > > > > > The coil connection is for pickup for the ignition amplifier > > which > > > is separate. > > > > If this was faulty your car would not run at all (i.e. no > spark) > > > > > > > > You will need to remove the coil cover and check for > continuity > > > between terminal marked "1" or "CB" and the pin at the idle > speed > > > ecu multiplug. Wire is white and slate I think. If this cable is > > > open circuit then the idle speed ecu has no engine speed > feedback. > > > > > > > > The blue wire (shielded) goes to the fuel computer and is from > > > the oxygen sensor input cable. > > > > > > > > You should now have checked all the wiring and assuming you > have > > > put the diode in the correct way round (stripe to the throttle > > > switch) there is nothing else I can suggest apart from removing > the > > > idle control valve and looking at the rotary valve when you > first > > > put the ignition to position 2. The valve should be controlled > to > > > fully open. If the valve fully closes then the 2 control wires > are > > > on the wrong way round or the plug has been shove on the wrong > way > > > round. > > > > > > > > This is assuming that the ecu and valve have been checked out > OK > > > btu I think you have had that confirmed already. > > > > > > > > One last thing I can think is that the ecu multiplugs have > been > > > put on the ecu the wrong way round but it is easy to tell if the > 4 > > > wired one goes to the right hand side socket on the ecu when > > viewing > > > the pins on the ecu. > > > > > > > > NickT > > > > > > > > blackaddertoo wrote: > > > > Hi Nick and all > > > > > > > > managed to slope off a site early, with tools in the boot and > do > > > > some more testing. > > > > > > > > checked diode with meter...reads 700 on diode test and tried > with > > > a > > > > test light and jump battery, lights one way and not the other > so > > i > > > > think the didode is ok. > > > > > > > > now with key on, in ignition positive power is ok at middle > > > > connection idle speed motor. > > > > > > > > ground connection at idle mutliplug checks ok for continuity > with > > > > body panel ie -ve ok. > > > > > > > > checked continuity of other two connections at idle speed > motor > > > plug. > > > > checks ok at ecu multiplug, ie no break in wire > > > > > > > > checked pulse coil connection on left side of rear engine at > fire > > > > wall...checks at 550 ohms...is this ok as specialT say this > > should > > > > be about 600+ ohms > > > > > > > > the only lead lest to check is the feed from the coil...do i > take > > > > off the coil cover and investigate there? i could not quite > see > > > > where the leads go...assuming it connects at the ecu mutliplug. > > > > > > > > tried again to start..runs 10 seconds then chugs and dies as > if > > > the > > > > engine is being starved of air/petrol...but it did idle fine > with > > > > the brass screws adjusted. > > > > > > > > one thing to note...a mouse has been living with the ecus in > the > > > > corner behind the drivers seat. > > > > the blue wire (i think it is the feed for the 02 sensor > maybe?) > > or > > > > is the the coil connection has a small amount of chew marks, > > > > exposing the wire below...does not look like the wire itself > has > > > > been damaged, however i think this looks like a shielded cable > so > > > > can't be good. > > > > maybe i might have to remove all the mutliplugs and the metal > > > > support and check all the wiring out. > > > > if the lambda ecu/wiring was faulty would the car idle with > brass > > > > screw adjustment? i thought not? > > > > > > > > thanx for any help. > > > > > > > > a mouse also chewed through my headlight wiring and the rear > of > > > the > > > > indicator plastic!!!! haven't found any dead ones though. > > > > > > > > regards > > > > > > > > Steve > > > > > > > > > > > > > > > > > > > > --- In doc-uk@xxxxxxxxxxxxxxx, Nick Tomlinson > > > > wrote: > > > > > > > > > > The resistance test is a simple one on a diode and you > remember > > > > correctly. > > > > > Diodes though can become 'leaky' when the PN junction breaks > > > > down which is why you check with the diode function. This will > > > show > > > > the voltage drop across the junction and depending on type > should > > > > show no voltage drop one way and between 500mV and 800mV the > > other. > > > > > > > > > > " > > > > > "Put your multimeter to volts. Connect the red cable of > meter > > to > > > > > > jump start post. Use black lead to check for throttle > switch > > > > input > > > > > (AT THE ECU MULTIPLUG) meter should read battery voltage > with > > > > > throttle closed (switch > > > > > > operated) and no voltage with throttle open."" > > > > > according to the workshop manual, does this input not just > earth > > > > > when the switch is closed (car at idle) so to test i earthed > it > > > > with > > > > > diode removed then tried to start car. > > > > > " > > > > > Yes, the unit does earth this switched point when the > throttle > > > > is closed. > > > > > The test I give will show if there is any feedback voltage > from > > > > the other circuit showing the diode has gone short, leaky or > open > > > > circuit. I am presuming that you earthed this input at an > earth > > > > point like the engine block or better yet the -VE battery post. > > > > > > > > > > Hope the circuit diagram I sent to you makes the connections > > > > clear. > > > > > Chances are you have an earth lead off somewhere so the unit > > > > isn't earthing at the earth pin. > > > > > > > > > > It's always harder to explain in words what you could do > > > > yourself in 20 minutes. > > > > > > > > > > This problem will be fixed soon. > > > > > > > > > > NickT. > > > > > > > > > > blackaddertoo wrote: > > > > > Hi Nick > > > > > > > > > > thanx for the reply. Don't worry you can talk technical as i > > > used > > > > to > > > > > do a bit of hobby electronics, building transmitters etc, > > simple > > > > > logic circuits etc. > > > > > > > > > > i thought the screw which has a lead to it earthed the ecu. > > > > > i will recheck the multiplug earth. > > > > > > > > > > i will check for continuity from ecu multiplug to idle > motor. > > > did > > > > > not have any wire long enough yesterday, as the car is > parked > > > away > > > > > from home. > > > > > > > > > > "Put your multimeter to volts. Connect the red cable of > meter > > to > > > > > > jump start post. Use black lead to check for throttle > switch > > > > input > > > > > (AT THE ECU MULTIPLUG) meter should read battery voltage > with > > > > > throttle closed (switch > > > > > > operated) and no voltage with throttle open."" > > > > > according to the workshop manual, does this input not just > earth > > > > > when the switch is closed (car at idle) so to test i earthed > it > > > > with > > > > > diode removed then tried to start car. > > > > > > > > > > the diode, i must be wrong but i thought it would read > > > continuity > > > > in > > > > > one direction ie no resistance one way and 100% the other, > but > > i > > > > > couldn't remember back to my electronics days. > > > > > > > > > > Regards > > > > > > > > > > Steve > > > > > > > > > > > > > > > > > > > > > > > > > --- In doc-uk@xxxxxxxxxxxxxxx, Nick Tomlinson > > > > > wrote: > > > > > > > > > > > > You said you checked the earth by: > > > > > > "earth check with continuity tester from screw into base > to > > > car > > > > > body, > > > > > > to ecu multiplug" > > > > > > > > > > > > This mounting screw just holds the ecu to the metal frame > > > which > > > > > is earthed. > > > > > > The earth on the ecu is actually one of the pins on the 6 > pin > > > > > multiplug so check this first using the test: > > > > > > > > > > > > "Put your multimeter to volts. Connect the red cable of > meter > > > to > > > > > > jump start post. Use black lead to check for earth at ecu > > > MULTI > > > > > PLUG, meter > > > > > > should read battery voltage." > > > > > > > > > > > > Check continuity of all wires from the idle speed ecu plug. > > > > > > Especially those to the idle speed motor. > > > > > > > > > > > > "so how do i check the input from the coil/distibuter > (which > > i > > > > > assume > > > > > > gives the rpm signal (also runs the rev counter input?)" > > > > > > > > > > > > Said this in last message > > > > > > "You can check for continuity using the resistance setting > on > > > > > the > > > > > > multimeter and check for wire continuity between the > switched > > > > side > > > > > > of the coil to the ecu plug, (remove the ecu first). If > there > > > is > > > > a > > > > > > suppressor, temporarily disconnect it in case this has > gone > > > bad." > > > > > > > > > > > > Your test on continuity test through the diode would give > a > > > > > result dependant on the positive feed from your multimeter > for > > > the > > > > > continuity test. This will be blocked or passed through (in > > > > laymans > > > > > terms) due to the characteristic of the diode itself, hence > the > > > > > diode test. > > > > > > > > > > > > Put the diode back in the circuit and do the test as in my > > > > > previous message > > > > > > > > > > > > "Put your multimeter to volts. Connect the red cable of > meter > > > to > > > > > > jump start post. Use black lead to check for throttle > switch > > > > input > > > > > (AT THE ECU MULTIPLUG) meter should read battery voltage > with > > > > > throttle closed (switch > > > > > > operated) and no voltage with throttle open." > > > > > > > > > > > > Do you have a circuit diagram of the idle speed ecu ? > > > > > > > > > > > > NickT. > > > > > > > > > > > > blackaddertoo wrote: > > > > > > hi Nick > > > > > > > > > > > > thanx for the post...i know a long one but here hoes.. > > > > > > > > > > > > earth check with continuity tester from screw into base to > > car > > > > > body, > > > > > > to ecu multiplug > > > > > > > > > > > > connected test light to main power ecu multiplug...lights > > with > > > > > > ignition each time (tested fuse-ok) > > > > > > > > > > > > check throttle switch input before/after diode, continuity > > > > before > > > > > > (with earth) non afterbut reads about 700 on doide test on > > > meter > > > > > > from your comment this looks about right but removed diode > > > > > > completely to test further. does not activate continuity > > > buzzer > > > > on > > > > > > positive or neg current...thought it should. > > > > > > > > > > > > have not checked coil to ecu or ecu plug to idle plug > > > > > > > > > > > > thermister has been replaced a couple of weeks ago...reads > > > about > > > > > > 1800 ohms cold so that is ok i think. > > > > > > > > > > > > tried earthing the throttle input and starting the > car....car > > > > did > > > > > > the same...runs for 15 secs then chugs and dies. > > > > > > > > > > > > car idles ok (1500rpm) with brass screws adjusted so i > assume > > > co > > > > > > adjustment is ok otherwise it would not run? > > > > > > > > > > > > > > > > > > so how do i check the input from the coil/distibuter > (which i > > > > > assume > > > > > > gives the rpm signal (also runs the rev counter input?) > > > > > > > > > > > > i'm running out of things to test but surely my problems > are > > > > here > > > > > > somewhere. > > > > > > > > > > > > Regards > > > > > > > > > > > > Steve > > > > > > > > > > > > --- In doc-uk@xxxxxxxxxxxxxxx, Nick Tomlinson > > > > > > wrote: > > > > > > > > > > > > > > How did you check the earth connection at the ecu multi > > plug? > > > > > > > > > > > > > > Have you checked for a switched connected at the ecu > > > multiplug > > > > > > from the throttle switch? > > > > > > > > > > > > > > Put your multimeter to volts. Connect the red cable of > > meter > > > > to > > > > > > jump start post. Use black lead to check for earth at ecu, > > > meter > > > > > > should read battery voltage. > > > > > > > > > > > > > > Put your multimeter to volts. Connect the red cable of > > meter > > > > to > > > > > > jump start post. Use black lead to check for throttle > switch > > > > > input, > > > > > > meter should read battery voltage with throttle closed > > (switch > > > > > > operated) and no voltage with throttle open. > > > > > > > > > > > > > > With the ECU plugged in, check the multiplug that goes > to > > > the > > > > > > idle speed motor, the centre pin should have 12v on it > (with > > > key > > > > > in > > > > > > ignition and tuned to position 2) continuously. The ecu > > > > > momentarily > > > > > > earths the outer pins to open and close the motor. > > > > > > > > > > > > > > You can check for continuity using the resistance > setting > > on > > > > the > > > > > > multimeter and check for wire continuity between the > switched > > > > side > > > > > > of the coil to the ecu plug, (remove the ecu first). If > there > > > is > > > > a > > > > > > suppressor, temporarily disconnect it in case this has > gone > > > bad. > > > > > > > > > > > > > > The white lead from the distributor to the ecu is from > the > > > > > > negatively switched side of the coil. If this was short > then > > > the > > > > > car > > > > > > would not run at all. > > > > > > > > > > > > > > > > > > > > > The Diode should be tested using diode function on the > > > > > > multimeter ideally not resistance. > > > > > > > Reading should be between 500 and 800 with test leads > one > > > way > > > > > > round on the diode, and no reading (ie infinite) the other > > way > > > > > round. > > > > > > > The diode is there to stop feedback voltage going to > this > > > > > > circuit, as the throttle microswitch operates a couple of > > > other > > > > > > circuits too. > > > > > > > > > > > > > > I would say from your resistance tests that this diode > > would > > > > > > appear to be open circuit. > > > > > > > Temporarily connect this wire to permanent earth for > idle > > > > > > testing purposes only. Does the car idle now?? If it does > > then > > > > the > > > > > > diode will need replacing. Note which way round the diode > is > > > > when > > > > > > you removed it and replace it with another the right way > > round. > > > > > > > > > > > > > > I am presuming that you have check for wire continuity > > > between > > > > > > the idle speed motor multiplug and the idle speed ecu > > > multiplug. > > > > > > > > > > > > > > Have you measured the thermister resistance? > > > > > > > Do this by using your multimeter on resistance and > connect > > > to > > > > > > the 2 pins on the idle speed ecu multiplug. If you get no > > > > reading > > > > > > (open circuit) then the connector to the thermistor > connector > > > > plug > > > > > > may have fallen off or the thermistor itself has gone bad. > > > > > > > If you get no resistance, you can make some short fly > leads > > > to > > > > > > enable the multiplug to be connected to the ecu by 2 pins > (on > > > > the > > > > > 4 > > > > > > pin block) and the thermistor ecu inputs to a 10 kilo ohm > > > > resistor > > > > > > to simulate the thermistor. If the car now idles then this > is > > > > the > > > > > > problem. > > > > > > > > > > > > > > NIckT. > > > > > > > > > > > > > > > > > > > > > blackaddertoo wrote: > > > > > > > Hi all > > > > > > > > > > > > > > an update on my idle problems > > > > > > > idle ecu and idle motor checked and working by martin at > > > DMUK. > > > > > > > now removed motor, blocked pipes and adjusted > screws...car > > > > idle > > > > > ok > > > > > > > at 1500 rpm. > > > > > > > checked power to ecu ok at plug, checked switch ok at > > engine > > > > but > > > > > > > diode reads no resistance either polarity. (should it?) > n > > > > moved > > > > > > for > > > > > > > further testing. > > > > > > > checked ground connection at ecu - Ok. > > > > > > > put Eecu and motor back in, shorted the > diode/microswitch > > > > input > > > > > to > > > > > > > earth...car idle 30 second then dies. exactly the same > > > problem. > > > > > > > removed diode short...idle 30 secs then dies. > > > > > > > > > > > > > > so i am left to check the input from the distributor > > (should > > > > the > > > > > > car > > > > > > > idle if this is dead and hence the ecu does not know > engine > > > > > > speed??) > > > > > > > and if the leads from the ecu to motor are OK. > > > > > > > > > > > > > > if i put a test light on the connector at engine end and > > > > switch > > > > > > > ignition, should there be a short positive signal on the > > one > > > > (to > > > > > > > either close the motor or open?) > > > > > > > > > > > > > > then remove the microswith...do the same and the other > lead > > > > > should > > > > > > > go positive. > > > > > > > > > > > > > > that is correct is it not, middle lead to motor is > ground > > > and > > > > > the > > > > > > > other run motor positive one way and positive the other > to > > > > close > > > > > > the > > > > > > > air valve??. > > > > > > > > > > > > > > Thanx for reading this!! and sorry to bore you. i am > > > > determined > > > > > to > > > > > > > resolve this (and enjoy it really!!) > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > DOC UK Website: www.deloreans.co.uk > > > > > > > Unsubscribe: doc-uk-unsubscribe@xxxxxxxxxxxxxxx > > > > > > > ** Unless otherwise stated, all messages posted to the > > group > > > > are > > > > > > assumed public and may be printed in the club magazine ** > > > > > > > Yahoo! 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