[DML] Re: Erratic idle speed - update

["jtrealtywebspannet" <jtrealty@xxxx>]

Setting up the fuel system on a twin turbo is vastly different from a 
stock Delorean. You should contact the vender you got the turbos from 
or one of the Delorean venders. They have experience with them and can 
talk you through. You can start with enriching the idle mixture by 
turning the air-fuel mixture screw under the tamperproof plug. Since 
there is no accelerater pump to overcome the initial leaning till the 
turbos kick in the idle mixture needs to be richer than normal. Any 
vacuum leaks will also hurt as they tend to lean the air-fuel ratio. 
Plug off the vacuum line going to the trans modulater. Make sure after 
adjusting the mixture screw there is a plug in the housing or you will 
have a BIG vacuum leak.
David Teitelbaum
vin 10757


--- In dmcnews@xxxx, Martin Gutkowski <webmaster@xxxx> wrote:
> Well we've been having another look at the car in question today.
> Definitely got all the spark plugs in the right holes.
> Checked for any dislodged hoses/electrical connections, found the 
capacitor going to the
> coil was disconnected, but this didn't seem to affect things anyway.
> Only unaccounted for double wire is a black wire and orange wire in 
a rectangular
> connector at the back of engine bay. Lost or surplus? (this is an 
auto tranny)
> One other strange point. The fuel adjustment screw has been blocked 
off. Is this normal
> on twin turbo setups - anyone? Apparently this needed to be drilled 
out on the
> fresh-from-the-factory engine (this engine has 34000 miles on it!)
> Idle speed switch is ok. In fact, the only time the engine will run 
is with it pressed!
> 
> Just to clarify a bit more what the engine is doing. The engine 
seems to idle quite
> nicely, although it doesn't hunt properly. When any throttle is 
applied it coughs
> splutters and attempts to stall. Also when throttle is applied the 
airflow sensor
> oscillates rapidly, and it misfires badly. With the engine off, the 
metering head
> plunger comes back with quite a spring when you push it down, unlike 
Martin's one which
> bounces nicely against the rubber endstop as the plunger drops down 
slowly.
> 
> Control Pressure regulator has been reconditioned. Could it be the 
metering head at
> fault??
> Any other ideas?
> 
> Thanks
> 
> Richard
> #2727