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2002 Lancer RPM Trouble

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2002 Lancer RPM Trouble - 7/26/2008 9:18:24 PM   
Abnatha

 

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Joined: 7/26/2008
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Purchased a 2002 lancer rally edition a few months back. 75k miles, new timing belt, automatic transmission. Recently I''ve noticed something odd. Fuel economy seems to have been reduced, and when in drive at a stop light, the engine gives a pulsing feeling, with the rpm bouncing between 700 and 1200 at a regular rhythm. I plan on going on long distance drives with this car and want to figure out the problem and have it fixed soon.

Any advice would be greatly appreciated!

Thanks
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RE: 2002 Lancer RPM Trouble - 7/26/2008 10:05:28 PM   
HandyPal

 

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Do you have the same effect at idle? Is there Air conditioning on or off? Could be number of reasons... Throttle position sensor if exists, O2 sensor, air leaks into exhaust/inlet. I would start checking from these components.

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RE: 2002 Lancer RPM Trouble - 7/27/2008 1:00:40 AM   
Abnatha

 

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During driving the air conditioning was off. The RPM only bounced while in drive or reverse. It stayed steady while in neutral.
Turning on the AC made the pulsing a bit more intense


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RE: 2002 Lancer RPM Trouble - 7/28/2008 8:33:15 PM   
darknigh7th


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spark plugs??

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RE: 2002 Lancer RPM Trouble - 7/31/2008 7:01:04 PM   
dsm1990gsx


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Do you have a check engine light?  Could be a vacuum leak or an iac going bad.

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