Car is surging during steady throttle - HELP! - Maintenance and Repair Forum

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Car is surging during steady throttle - HELP!
Tuesday, February 15, 2005 7:17 AM
i've got no idea why it's doing this....

when i accelerate to cruising speed (usually around 40), and hold the gas at a steady level, the car jumps and surges forward randomly...(increases of around 2-300 RPM) and then goes back to normal throttle.

nothing else seems wrong (unless you the slowness )

i'm thinking mebbe the fuel filter (it shouldn't be the injectors, i ran some seafoam through my tank a few months ago)

or possibly my tranny. I just hit 50k miles, and i'm SURE it needs a flush and fill. Too bad i don't have a lift, or i'd check the tranny fluid level.

any suggestions or familiar experiences?





Re: Car is surging during steady throttle - HELP!
Tuesday, February 15, 2005 3:55 PM
nobody??




Re: Car is surging during steady throttle - HELP!
Tuesday, February 15, 2005 5:37 PM
Do you have the A/C on at this time? Maybe the IAC motor is over-compensating for the anticipated A/C load, but the compressor clutch isn't engaging as expected. Does you A/C work?
Just an idea to start with.



http://registry.gmenthusiast.com/images/2002sunfiresl/Modified%20sunfire2.jpg
Re: Car is surging during steady throttle - HELP!
Tuesday, February 15, 2005 9:21 PM
no, the AC works fine, i don't use it much at all...like mebbe once every 4 months or something


but i think mebbe you've got something with the IAC sensor.....

how much do they run?




Re: Car is surging during steady throttle - HELP!
Wednesday, February 16, 2005 7:25 AM
the IAC sensor for my 97 2.2 was about $80





Re: Car is surging during steady throttle - HELP!
Wednesday, February 16, 2005 9:06 AM
check your TPS (throttle position sensor) my car did the same exact thing on my old 2.2 and i changed this and it worked just fine..






Re: Car is surging during steady throttle - HELP!
Wednesday, February 16, 2005 11:56 AM
I'm having a similar problem.. But in my case I noticed.. the RPM's drop by 300 + RPMS and then when the RPMS surge up back to normal. It only does this when warm, at Highway Speeds 45-65 mph's. Anyone else experience this problem? I took it to the dealer a while back and they replaced the coils and changed the spark plugs.

Thanks,

Jeff
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