4kq runs rough when cold

[Ameer Antar]

the WOT [full throttle switch] should be fixed first. The WOT switch makes 
the mixture rich. The rough idle is caused by the rich mixture. The dealer 
may have soldered it on b/c the mixture was too lean. The correct way to 
adjust mixture is to adjust the 3mm allen screw in the fuel distributer. 
There could be more problems, but you really need to start getting things 
working as originally designed. You'll also need some good reading to 
help....a Bentley manual is a good place to start. Another good book [only 
about CIS fuel injection] is 'Bosch Fuel Inj. & Engine Mgt.' by Charles 
Probst. It's only $20 and very helpful. good luck.

-ameer


At 02:01 PM 11/26/2000 , Greg Rich wrote:
>Hey Guys need some input.
>1986 4000 S quattro, 5 cyl, non turbo,
>Bought the car from a VW dealer as traded, did my own tune up (wires, plugs,
>cap/rotor, fluids), noticed the full throttle switch was wired shut (switch
>making contact). Took it in to them as I had no idea what to do. They spent a
>good day looking at it, changed the air filter (which I couldn't wrestle out)
>and came up with nothing. I needed the car for the weekend and was to arrange
>to bring it back-work order left open. The dealer is now closed (bankrupt), so
>I am in the cold as too what is wrong with my car! (but never had to pay
>either). So here it is
>
>1.Starts fine, hot or cold, cranks and fires rigth away
>2.After running a few seconds it will start to miss (idle)
>3.After running a couple minutes it will stall (idle)
>4.If I try to drive it will buck and miss and be a really difficult to get up
>to highway speed
>5.After running 15 minutes it will run like a champ, then once in a while miss
>fire
>
>I have unplugged various sensors and switches but cannot fool it. It will
>however run quite well when the full throttle shut is making contact (running
>rich). I do not want to take it in again elsewhere and have to pay for
>diagnostics when most of it was already checked. I do know the oxygen sensor
>is toast. Any recommendations?
>Thanks
>Greg
>
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