I have a 1994 940 turbo Wagon
Working very well but has quite a rough idle on cold start, almost chokes out.
On a warm start all is well.
Where would anyone suggest that I start looking?
Plugs and air filter are new
Thank you
A good place to start is by cleaning the throttle body and idle air control valve (the cylindrical air valve under the throttle body. They tend to get fouled with deposits, especially the idle passage from either side of the throttle plate to the thumbscrew underneath. Cold stalling is a typical symptom for dirty throttle bodies.
I remove my throttle body for thorough cleaning (takes about half a can of carb cleaner!) but it can be done on the engine.
Mike
Thanks Mike
This cleaning was or is on my to-do list and although it can be done on the engine I was sort of thinking of doing the whole works, hence yanking it off. Car is new to me and I would like to get an idea of just how dirty everything is.
Any idea about my other post (replacing air intake) as it relates to this as well.
Thank You
Took the car out to my mechanic last weekend and he removed and cleaned the throttle body (somewhat dirty, smaller of the two ports was plugged)
Rough idle is better but not gone away.
What should a fellow look at next?
Gwen Stefani, Catherine Zeta-Jones, or Angelina Jolie would smooth most things out IMHO :)
---might help if you told us what kinda car, what year, have you done the obvious fuel and ignition system maintance and how many miles are on the car.
Sorry, Sorry
For a minute there I thought you were all mind readers.
Car is 94 940 turbo wagon, 110,000 miles, is not the Regina System.
Replaced plugs, wires, air filter, removed and cleaned TB so far. Volvo just popped in new crank sensor via recall.
Runs great when warmed up, just a rough idle on a cold start. Idle stays below 1000 during cold start, I would guess some where around 750 rpms.
Cap and rotor? I know it's a bitch to get to!
Try cleaning the Idle Air Control Valve and checking the MAF for cleanliness. Some air filter housings collect a large amount of plastic foam dust which can affect the MAF.
All the best, Peter.
700/900/90 Register Keeper, Volvo Owners Club (UK).
The mark of a seasoned shadetree mechanic!
Mike
From their new commercial I think some Heineken light would also help immeasurably... :) (you have to drink imported beer to fix an imported car, no?)
--Steve (who has yet to find a brew to exceed the unique wonder of Dortmunder Union Dark, although Becks will work in a pinch (started drinking those when I had VW's - Do I need to change to one of these?
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