2004 auto vett surges when coasting help
Thread Starter
Le Mans Master
Joined: Jan 2009
Posts: 7,767
Likes: 19
From: East Texas
2004 auto vett surges when coasting help
my 04 c5 surges when you let off the gas to coast pulses it is automatic i noticed it even when the car was bone stock can someone help me does anyone have the same problem? 
Melting Slicks
Joined: Jun 2004
Posts: 3,439
Likes: 6
From: Newark, DE
St. Jude Donor '06
There's a lot of things that could cause this, but I'd start with the easy stuff first. Remove the intake/filter assembly from the throttle body and check the MAF and throttle body opening. Clean the MAF with something like spray contact cleaner, and clean the mouth of the tb with a turpentine-soaked rag or something similar. If the MAF is dirty, it'll send the wrong signals to the PCM re airflow requirements. If the tb opening is dirty, the crud buildup could prevent the butterfly from closing fully.
Question: How is idle and driveability when the engine is cold?
GL!
Question: How is idle and driveability when the engine is cold?
GL!
Tech Contributor
Joined: Jan 2007
Posts: 19,425
Likes: 1,146
From: Dyer, IN
I assume you discussed this with your tuner? Did they notice it during/after tuning, or when road testing after dyno?
Thread Starter
Le Mans Master
Joined: Jan 2009
Posts: 7,767
Likes: 19
From: East Texas
There's a lot of things that could cause this, but I'd start with the easy stuff first. Remove the intake/filter assembly from the throttle body and check the MAF and throttle body opening. Clean the MAF with something like spray contact cleaner, and clean the mouth of the tb with a turpentine-soaked rag or something similar. If the MAF is dirty, it'll send the wrong signals to the PCM re airflow requirements. If the tb opening is dirty, the crud buildup could prevent the butterfly from closing fully.
Question: How is idle and driveability when the engine is cold?
GL!
Question: How is idle and driveability when the engine is cold?
GL!
Thread Starter
Le Mans Master
Joined: Jan 2009
Posts: 7,767
Likes: 19
From: East Texas
Thread Starter
Le Mans Master
Joined: Jan 2009
Posts: 7,767
Likes: 19
From: East Texas
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Thread Starter
Le Mans Master
Joined: Jan 2009
Posts: 7,767
Likes: 19
From: East Texas
ill try cleaning some parts and let you guys know how it works thanks
