2nd Generation Specific 1986-1992 Discussion

where to adjust idle speed

Old 07-31-2011, 08:38 PM
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Join Date: Jul 2011
Location: San Francisco, CA
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I just bought 88 turbo II... Runs nice, but have a couple issues... Variable idle speeds and not sure if i adjusted the right screw... I have repair manual but it is very vague on idle control. I wanted to know if somebody could take a photo with the arfea i adjust idle in photo. Also, temp guage does not seem to work, unless it doesn't get hot, and i know that is not the case. adjusted timing and that solved a turbo lag issue. the old owner was running 20w 40 oil, i swithched to 10w 40... Would that make a diff? Also, when i start the thing cold, i know from previouse models it goes to 3000 rpm then gradually slows to an idle of about 800. Mine does not go above 1000 unless you give it a little help with accelerator. I am stumpped. I adjusted a screw above the turbo on the right side of intercooler and that seemed more like idle mixture. Can SOMEBODY tell me what the hell is going on?
donmhall is offline  
Old 09-08-2011, 06:49 PM
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Location: Houston Tx
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Well, nobody seems to have any answers, so I will try to help. First thing is go and buy yourself a Haynes repair manual. On my 87 turbo2, the Bypass air control valve is the is where I adjust my idle speed. It is located above the turbo if you are standing in front of the car looking at the motor, the BAC valve is on the left of your intercooler and slightly below it. If you look closely at it, there is a piece that stems off of it with cap on it called a blind cap. Remove the cap and you will see a screw inside-that is the air adjust screw. Turn the screw to adjust idle speed...just make sure the engine is at normal operating temperature when you do this.

Secondly, 20w50 is the recommended oil for the turbo 2. Thirdy, The problem your having is the accelerated warmup process not working. If it is not working do not fret... it is not a desireable trait with these cars. One of the worst things you can do to a cold engine is rev it up high upon startup. I almost forgot, I have a problem with my passenger side window not working. Bad connections are a common problem on these cars, mostly due to age. I will have to remove my inner door panel and resolder my connections there. This could be the problem with your temperature gauge not working. You will have to follow all your connections and check them all, a haynes manual contains alot of wiring diagrams. The best thing to do is install an aftermarket temp gauge anyway. The stock one isnt very reliable, I hope this helps!
Clark13b is offline  
Old 09-08-2011, 09:18 PM
Join Date: Jul 2001
Location: Stuart, FL
Posts: 24,412

My guess is you didn't get any answers because you put this in the suggestion box. I'll move it to a more appropriate forum.
phinsup is offline  
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