[DML] Re: Hot exhaust

["Nick" <nicholden@xxxxxxxxx>]

Round 3:

I have swapped number 1&2 injectores with 5&6 and the problem has 
stayed with 1&2.

The engine was dead cold and within 2 minutes number 1&2 extractor 
was around 160degC while the rest was 90degC. So that eliminates 
any 'cooling' system blockage possibility as the whole engine was 
cold.

I also Trile checked the firing order which was correct. For a test 
i swapped number 1 & 2 spark plug leads which caused a miss hence it 
was correct before.

I have contacted the sofware engineer who has suggested he come back 
next week with 6 remote coils and attach them into the computer so 
we can remove the distributor as a possibility for incorrect rotor 
phasing etc.

Running out of options .............. I am now confident it is not a 
fuel delivery issue or a spark plug issue. 

Cheers, Nick





Posted by: "David Teitelbaum" jtrealty@xxxxxxxxxxxxx 
jtrealtywebspannet
    Date: Wed Nov 8, 2006 7:22 am ((PST))

Since the cylinders are leaning out under boost air leaks are less of
an issue. My guess is some kind of quirk causing cylinders 1 & 2
injectors to be metering less fuel than required. I would swap them
around to see if the problem moves or measure them somehow against 
the
others to be sure they are balanced against the others. Depending on
the system they may be indidually calibrated so you can put more or
less in each cylinder by modifying the fuel map. Pulling the spark
plugs will confirm that the cylinders are running lean. Meausuring 
EGT
from each cylinder is another way to tell. Before running the motor
again I would do a compression test and leak-down test to make sure
each cylinder is working and there is no damage. I would not suspect
an ignition timing problem since the other cylinders seem to be
running alright. I would recheck that there is no mistake with the
firing order and that the wires are not cross-firing between 1 & 2.
David Teitelbaum
vin 10757







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