Re: [DML] Poor Running when cold, Please Help

[Soma576@xxxx]

In a message dated 10/16/03 6:57:12 PM Central Daylight Time, dcsj@xxxx 
writes:


Is there a most 
> 
> likely item we should be looking at that would cause this senario of 
> events?
> 
> Thanks, Dennis 5180

Dennis,

Does it do this stuff every single time when it is cold? does it clear up 
every single time once it gets warm?

Important things to check would be proper operation of the control pressure 
regulator (which is dependant on ambient temperature). this can be checked 
with a fuel pressure gauge, instructions are in the shop manual. at 20 degrees, 
your control pressure should be between .8 and 1.5 bar.

also you want to check the entire vacuum system for correct routing or bad 
hoses (more likely). when the engine is cold, the lambda system should go into 
a fixed pulse setting which will make the engine run a little rich to enhance 
cold running driveability. this is determined by the lambda thermal switch 
under the intake manifold. 

the only other thing i can think of that changes with temperature for the 
engine would be the heat stove valve in the air intake hose. if it is stuck, i 
suppose it would worsen driveablity at certain temperatures.

You should read all of the 'Fuel, Emission, and Exhaust System' chapter in 
the shop manual. many secrets will be revealed and understood!

Good luck,
Andy


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