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  #1  
Old 04-15-2010, 09:04 PM
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my rpms are jumping

anyone know why my rpms would bounce when i put in park
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Old 04-15-2010, 10:26 PM
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Exclamation Re: my rmps are jumping

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Old 04-15-2010, 10:27 PM
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Re: my rmps are jumping

egr maybe? no codes I guess? could be a lot of things really
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Old 04-15-2010, 11:40 PM
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Re: my rmps are jumping

You're WK is playing HipHop in it's head and bumping to the beats.
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Old 04-16-2010, 08:40 AM
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Re: my rmps are jumping

Could be the idle air control motor. Did you recently install a tune/disconnect the battery? It does this sometimes when it "learns".
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Old 04-16-2010, 06:15 PM
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Re: my rmps are jumping

My RPM's jump when I slow down to a stop and the tranny downshifts, its really noticable with the intake and exhaust sounds but im not sure what the problem with yours would be.
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Old 04-16-2010, 07:10 PM
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Re: my rmps are jumping

Quote:
Originally Posted by jeeppro View Post
anyone know why my rpms would bounce when i put in park

the same thing happens some times with my jeep. they told me long time ago, maybe i needed to clean my fuel injectors???? anyone know?
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Old 04-16-2010, 07:18 PM
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Re: my rmps are jumping

Well it's normal for rpms to move when pressing the brake right? AND you are pressing the brake when putting it in park so...Do this...put it in park and pump your brake. If the rpms go up or down like what your describing I think that's normal...
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Old 04-19-2010, 08:27 PM
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Re: my rmps are jumping

Completely different vehicle but when i had my Oldsmobile, i had the same issue with it with the weird RPMs. It sounded like the engine was also struggling to stay on when idle too. It turned out to be a bad PCV valve and partially clogged breather tubes.

Same went for my buddies 85 Cherokee back in the day, clogged breather lines and a clogged CCV system (older jeep system similar to PCV). Once these systems were cleaned and appropriate parts replaced, the engine ran smooth and didnt sound like it was gonna die when the rpms were dipping.

It might not be the issue but it is worth a shot...similar issue to what i had resulted from this. I hope this helps man.
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Old 04-20-2010, 10:27 AM
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Re: my rpms are jumping

Check MAP sensor and clean/replace also check and clean the throttle body. It could be a lot of things but those are the easy check and clean ones.
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Old 04-21-2010, 09:23 PM
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Re: my rpms are jumping

Your engine is embarrassed and trying to escape from you......















































maybe
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Old 04-22-2010, 04:31 PM
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Re: my rpms are jumping

is it the 4.7? mine jumped alot when the TPS was going bad, replace it with a dealer one before it goes bad, mine went bad on the highway going 80, dropped the tranny into 2nd (i think), scared the shit out of me, check engine light and red line, ran my codes and it was then "TPS sensor low or no voltage" thing
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