high idle
Thread Starter
Instructor
Joined: May 2002
Posts: 133
Likes: 1
From: houston tx
high idle
i am having a high idle problem.The car idles in park at 1000-1300 and drive800-1000. I have done everything i can think of.no vacuem leaks,changed iac,no codes ecxept for maf burnoff ,replaced maf with known good one.Know one has messed with the idle since the plug is still in.someone told me if that injectors are leaking that might cause an idle problem so i cleaned the injectors. still having a problem. :(
Le Mans Master
Joined: Dec 1999
Posts: 8,540
Likes: 1
From: And on the fifth day, subpoenas were served to Obama senior staff
Re: high idle (mak567)
1988 car.
Do you still have code 36? Usually burn off code no caused by the MAF, but the burn off / power relay behind the battery.
A scanner would help you out a lot. Sounds like you are checking the right things. I would suspect a vacuum leak as well.
anything else you can add?
Pete
Do you still have code 36? Usually burn off code no caused by the MAF, but the burn off / power relay behind the battery.
A scanner would help you out a lot. Sounds like you are checking the right things. I would suspect a vacuum leak as well.
anything else you can add?
Pete
Team Owner
Joined: Dec 2000
Posts: 90,675
Likes: 304
From: SE NY
Cruise-In II Veteran
Re: high idle (mak567)
First replace the MAF burnoff relay. A dirty sensor wire could be giving false air flow readings.
Then clean the TB bore and throttle plates with intake cleaner, not carb cleaner.
Then clean the TB bore and throttle plates with intake cleaner, not carb cleaner.
Thread Starter
Instructor
Joined: May 2002
Posts: 133
Likes: 1
From: houston tx
Re: high idle (PeteL)
I have already taken of the TB cleaned it ,and nothing.i have a snap-On scanner and everything looks ok. if anyone out there has any parameters i can go by such as block learn #'s . as far as i can hear and see there are no vacuem leaks unless there is one that might be a common problem on these engines that i might not be aware of.
Le Mans Master
Joined: Dec 1999
Posts: 8,540
Likes: 1
From: And on the fifth day, subpoenas were served to Obama senior staff
Re: high idle (mak567)
There are so many places for a vacuum leak it's nutz!
On your scanner at idle (should be warmed up)
Loop status (open /closed)
Desired idle
Actual idle
IAC steps
MAF gm
throttle position % or voltage or both
coolant temp
engine load
IAT temp
timing advance
manifold absolute pressure if available
knock counts
knock retard
Also follow TPS through a full throttle range with the car off / ign on. Should be smooth and see what you get for voltage from start to WOT.
[edit] Block learns should be centered around 128
[Modified by PeteL, 5:15 PM 5/17/2002]
On your scanner at idle (should be warmed up)
Loop status (open /closed)
Desired idle
Actual idle
IAC steps
MAF gm
throttle position % or voltage or both
coolant temp
engine load
IAT temp
timing advance
manifold absolute pressure if available
knock counts
knock retard
Also follow TPS through a full throttle range with the car off / ign on. Should be smooth and see what you get for voltage from start to WOT.
[edit] Block learns should be centered around 128
[Modified by PeteL, 5:15 PM 5/17/2002]
