Idle surge

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2 months 4 days ago #201931 by 67impala
Idle surge was created by 67impala
Hello everyone. I am having an issue with my wifes car. It is a 2005 Suzuki forenza 2.0l i have changed every sensor i can think of and a full tune up. Along with a new timing belt. Sk the issue is when sitting at a stop the motor just does like a surge i am assuming uts an idle problem but everything has been checked. When it surges the idle drops from 800 ish to about 500 ish but only lasts for about a second. I uave checked the injectors no vacuum leak anywhere. I just can't for the life of me figure it out.

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2 months 4 days ago #201932 by relative4
Replied by relative4 on topic Idle surge
How did you check for vacuum leaks? What are your fuel trims at idle, 2500, and 4000?

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2 months 3 days ago #201940 by 67impala
Replied by 67impala on topic Idle surge
I visually checked for a vacuum leak on all hoses and used some carb cleaner. It idles at around 700 should be 850 i changed the iac and the tps. And it has a new intake manifold gasket. I am not sure on the fuel trims it does maintain 60 psi fuel pressure at idle.

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2 months 3 days ago #201941 by 67impala
Replied by 67impala on topic Idle surge
I have a new diagnostic computer coming today so i will be able to do some live tests.

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