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Old 09-07-2010, 06:00 PM   #1
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spark plugs?

Lately my jeep hasn't been running as powerful or as loud. It's also has been running different when I first start it and am not moving. Would the spark plugs be the issue?

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Old 09-07-2010, 06:04 PM   #2
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The same issue happened to me and changing the spark plugs did resolve the issue but still it could be many things.How does the engine sound?any misfiring?

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Old 09-07-2010, 06:20 PM   #3
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It COULD be spark plugs, how many miles have they been installed and what kind are installed now?

What engine and model year do you have?
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Old 09-07-2010, 06:47 PM   #4
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i have a 98 stock s6
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Old 09-07-2010, 06:48 PM   #5
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not really but it just idles alot faster than it usually does
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Old 09-07-2010, 07:02 PM   #6
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Plugs wouldn't cause a higher idle, a higher idle is usually due to a vacuum leak of some kind. Could be a dirty IAC (idle air controller) or a vacuum leak from any of the usual possible sources of vacuum leaks. Or it could be caused by a bad TPS (throttle position sensor)
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Old 09-07-2010, 07:07 PM   #7
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how do I fix these?
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Old 09-08-2010, 03:02 AM   #8
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Take the iac off ms use a carb cleaner like Chem-tool. As for vacuum leaks check your intake up and down and see if anything down stream from the throttle body like the pcv outlet tube or the vacuum brakes booster? Checking the tps I use a scan tool with live data to see the output. Slowly opening it you can see if it has a open in it, 0 voltage.it can be done with a multimeter but you have to find the signal wire

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