help with idle problm
08-21-01, 12:25 PM
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help with idle problm
Have similar idle problem. 94 FD with DP,IC,Air Bos and replumbed vacum. Removed DT. When car is warm idle lunges fron ~500 to 800 rpm. Sometimes knocks off. If I turn the AC on it revs to ~1000 rpm and idles just fine. Car runs great, plenty of boost. I have the fast idle cam wired open, wax rod deal is not a problem. Suspect a disconnected electrical connection under the extension manifold or perhaps at the ACV. Does anybody have an idea? Does the AC turn on provide a hint? I dread pulling the extension manifold without a clue. Also when I crank up cols I do not get the 3000 rpm idle. It seems to gradually rise to about 800 rpm. Thanks for any help you guys can give.
08-21-01, 12:50 PM
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Did u drained your Radiator fluid?? If you did try to burp the system, if not do you have the main cat still make sure the cat is not cloged o yeah one more to check on on the side of the intake manifold by the firewall there's a hose that connects to the manifold from the elbow, last time mine disconnected my idle went down and it would not idle @3000rpm at the cold start. That hose is basicaly for your cold start. Make sure the hose is in good condition.
Kelvin
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08-22-01, 05:27 AM
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I am running DP, have already burped the cooling loop. I am using the Greddy ellbow that does not have the connection for the air pipe you are refering to. I just plugged the hose comming out of the extension manifold. My problem is not cold idle, its only when it gets hot.
08-22-01, 01:18 PM
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No engine codes?
Could be the ACV or the intake temp sensor. Could be a bad air bypass adjustment or throttle door setting. Could be a vacuum leak at any point like gaskets, check valves, and hoses.
Could be the ACV or the intake temp sensor. Could be a bad air bypass adjustment or throttle door setting. Could be a vacuum leak at any point like gaskets, check valves, and hoses.
08-23-01, 08:21 AM
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thanks guys. I have no engine codes. Does anybody know what is normally done with the air hose from the stock intake ellbow to the manifold when using the Greddy ellbow? I just plugged mine up at the manifold.
I replaced all gaskets when putting back togather after vacum plumbing.
Another symptom is a low pitched growl when lightly pushing on the accelerator. Sounds like air turbulance. I suspect it may be the little round diaphram in the ACV is not in place. Guess I will have to take this thing apart again.
Still looking for suggestions
One last thing. When stepping on the accelerator in any gear my boost jumps to ~15 PSI just for about a second or two before the waste gate starts dumping. Is this normal and is it dangerous?
I replaced all gaskets when putting back togather after vacum plumbing.
Another symptom is a low pitched growl when lightly pushing on the accelerator. Sounds like air turbulance. I suspect it may be the little round diaphram in the ACV is not in place. Guess I will have to take this thing apart again.
Still looking for suggestions
One last thing. When stepping on the accelerator in any gear my boost jumps to ~15 PSI just for about a second or two before the waste gate starts dumping. Is this normal and is it dangerous?
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