surge at idle
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Instructor
Joined: May 2010
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surge at idle
help please, 1996 c4 lt1 coup. replaced water pump, all front seals, opti spark, plugs, wires and car ran and runs strong, but now at idle the motor surges high and low and lights go dim and back to normal again.
what size hammer should i use the big big one or little one, not sure where to start checking for the cause of this..
help please...
what size hammer should i use the big big one or little one, not sure where to start checking for the cause of this..
help please...
Last edited by pastamike; Nov 22, 2013 at 04:24 AM.
Drifting
Joined: Mar 2012
Posts: 1,492
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From: New Jersey
How many miles? Have you checked for codes with a scanner? Were there any problems before you changed opti, wires and plugs? More information is needed. If you are at or near 100K you may need front (pre-cat) oxygen sensors, could be IAC or throttle position sensor among many other things. 
Thread Starter
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How many miles? Have you checked for codes with a scanner? Were there any problems before you changed opti, wires and plugs? More information is needed. If you are at or near 100K you may need front (pre-cat) oxygen sensors, could be IAC or throttle position sensor among many other things.
just turned 50,000 miles and all other work has been done about 4 months ago, so dont think crossed wires would be it. but will scan in the morning for any codes if any show up..
thanks for the input.
pastamike
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Melting Slicks
Joined: Jun 2013
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And the plugs. When you replaced the ignition wires, which is the proper name for spark plug wires, you may have crossed them. That means, you may have put a few on the wrong spark plug.
Le Mans Master
Joined: Mar 2010
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From: Eugene Oregon
I believe in the Beer Fairy
St. Jude Donor '15,'19
I think he is saying this is a new problem, and the car ran fine after the work done on it, correct me if I am misunderstanding. Mike use the little hammer it doesn't sound to serious. 
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Pro
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From: Nashville TN
Clean the IAC and the throttle body? It fixed mine and my wife's Escalade with a 6.0. Hers had funk on the throttle body plate interfering with proper airflow. The IAC kept opening and closing trying to properly meter the air
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you are correct, the work was done 4 months ago and car runs strong, this is a new problem now. looking for the little hammer. lol
Thread Starter
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waiting for my brother to bring over his scanner to see if it has any codes, and was thinking the same thing also, cleaning it wont hurt a bit anyway, thanks for the help..
pasta.