Rough Idle
Thread Starter
Instructor
Joined: Apr 2002
Posts: 159
Likes: 0
From: Delanson NY
Rough Idle
89 L98 with mods:
Problem:Cold starts great and she'll idle nicely!
After she warms up, when you start she'll stall unless you tap the gas, plus when you come to a stop she tries to stall and sometime succeeds. Would it be a bad sensor or incorrect adjustment??? Please advise, Thanks!
Problem:Cold starts great and she'll idle nicely!
After she warms up, when you start she'll stall unless you tap the gas, plus when you come to a stop she tries to stall and sometime succeeds. Would it be a bad sensor or incorrect adjustment??? Please advise, Thanks!
Melting Slicks
Joined: Jun 2004
Posts: 3,032
Likes: 4
Originally Posted by CFI-EFI
First, check for codes, set. That will answer the sensor question. Failing any codes, thoroughly clean the IAC AND the IAC passages. Then get back to us.
RACE ON!!!
RACE ON!!!
Race Director
Joined: Jan 2004
Posts: 18,726
Likes: 710
From: Bergen County, NJ
Originally Posted by mikey whipreck
is there a tech tip for this? can it be done without removing the TB?
Racer
Joined: Aug 2004
Posts: 379
Likes: 170
From: Buffalo Grove IL
Uggh, same symptoms myself and several others are having. I did a couple simple replacements (new spark plugs, new O2 sensor) to see if it would help, it didn't. Checked the resistance of the fuel injectors this last weekend, four were just over 5 ohms, one at 9 ohms, and one at 14 ohms. The remaining two were right at 16.8 ohms both cold and hot.
I ordered a new set of injectors today, probably will be a couple weekends before I get 'em in but will keep you posted if it helps the warm idle.
Ben
I ordered a new set of injectors today, probably will be a couple weekends before I get 'em in but will keep you posted if it helps the warm idle.
Ben
Team Owner
Joined: Oct 2000
Posts: 96,443
Likes: 9
From: Fort Knox, KY
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Check your PCV valve, too. I replaced mine last weekend and it was either O.E.M. or SERIOUSLY past its service life. Car idles much smoother now.
Race Director
Joined: Sep 2000
Posts: 17,298
Likes: 33
From: The Top of Utah
Originally Posted by Metz8790
I have the same problem. I checked the codes and it said the o2 sensor was bad, but i changed it and it still dose it so the next step im going to check the EGR valve
RACE ON!!!
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Le Mans Master
Joined: Feb 2000
Posts: 9,715
Likes: 27
From: Kempner Texas
A few years ago I had a bad idle problem that was traced to a broken MAF wire.
I borrowed a MAF from a guy I know off his 85 and the idle problem cleared up instantly.
Got a replacement off a wrecked car at my local wrecking emporium for $50
Jake
I borrowed a MAF from a guy I know off his 85 and the idle problem cleared up instantly.
Got a replacement off a wrecked car at my local wrecking emporium for $50
Jake
