replace the bulb first...then you may want to clean or replace the IAC.
surging l98
Thread Starter
Racer
Joined: Jun 2006
Posts: 477
Likes: 1
From: Jefferson Georgia
surging l98
Ok guys, 1988 l98 coupe, no mods. The problem is surging at idle, 500 rpm to 800 and back. No way of knowing if the check engine light is on as it's burned out(doesn't come on when starting). Once I replace that bulb, how can I display tr codes or is it possible without a scanner? I believe the milage has been suffering a few as well. Any help or direction would be appreciated.
Jay
Jay
Melting Slicks
Joined: Apr 2002
Posts: 2,546
Likes: 0
From: Orlando FL
Replace bulb - test codes.. Vacuum leak, IAC, and even the Throttle Position Sensor could give you these problems. Keep us posted on the progress. Someone in here has experience the same problem - Im sure of that 
Le Mans Master
Joined: Mar 2001
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From: Life is just one big track event. Everything before and after is prep and warm-up and cool-down laps
Cruise-In III Veteran
Cruise-In IV Veteran
St. Jude Donor '12
Replace bulb, check codes.
When I had my 88 it had hesitation and other drivability issues.
Changing the spark plugs, wires, coil, cleaning the TB and the IAC smoothed it right out.
When I had my 88 it had hesitation and other drivability issues.
Changing the spark plugs, wires, coil, cleaning the TB and the IAC smoothed it right out.
Le Mans Master
Joined: Feb 2006
Posts: 8,753
Likes: 9
From: Louisiana
There is not a code 35...code 36 has to do with the MAF, circuit, connection, and/or relays. If you have a factory service manual, just follow the troubleshooting tree and it should tell you the problem. Agent86 (forum member) has this on pdf and he might help if you don't have a manual. I would fix the code first before going any further.
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Team Owner
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From: Summerland B.C. Canada
Le Mans Master
Joined: Feb 2006
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From: Louisiana
Originally Posted by formerfoxbody
I don't have a fsm, where are the relays located?
jay
jay
Le Mans Master
Joined: Feb 2006
Posts: 8,753
Likes: 9
From: Louisiana
Check it out. I had this code when I started working on my some time back. I replaced the burnoff relay and the code went away. I have seen some guys post too replace both the power and burnoff relay when you replace one. All I needed was the burnoff to fix the problem. Let us know if you run into any problems.
Thread Starter
Racer
Joined: Jun 2006
Posts: 477
Likes: 1
From: Jefferson Georgia
ok guys, replaced both the power and burnoff relays and cleaned the IAC to no avail. Surging when warm, time to start hunting wiring issues to rule that out. Any more clues I would greatly appreciate it.
jay
jay
Burning Brakes
Joined: Jun 2002
Posts: 1,001
Likes: 1
From: sd
You can try my last post off of this thread to give you some ideas.
http://forums.corvetteforum.com/show....php?t=1490487
http://forums.corvetteforum.com/show....php?t=1490487
Thread Starter
Racer
Joined: Jun 2006
Posts: 477
Likes: 1
From: Jefferson Georgia
Unplugged MAF absolutely no change accept for the expected SES light.
Surging just as before unplugging. Not knowing much about what the ecm is looking for what would this be telling me?
Jay
Surging just as before unplugging. Not knowing much about what the ecm is looking for what would this be telling me?
Jay