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jeeppro 04-15-2010 09:04 PM

my rpms are jumping
anyone know why my rpms would bounce when i put in park:o

jeeppro 04-15-2010 10:26 PM

Re: my rmps are jumping

Scottina06 04-15-2010 10:27 PM

Re: my rmps are jumping
egr maybe? no codes I guess? could be a lot of things really

onorok 04-15-2010 11:40 PM

Re: my rmps are jumping
You're WK is playing HipHop in it's head and bumping to the beats.

sanitarium16 04-16-2010 08:40 AM

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".

05quadratrac 04-16-2010 06:15 PM

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.

BDP08 04-16-2010 07:10 PM

Re: my rmps are jumping

Originally Posted by jeeppro (Post 190269)
anyone know why my rpms would bounce when i put in park:o

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?

Unholyskorn86 04-16-2010 07:18 PM

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...

mjl2610 04-19-2010 08:27 PM

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.

Escape 04-20-2010 10:27 AM

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.

05wkguy 04-21-2010 09:23 PM

Re: my rpms are jumping
Your engine is embarrassed and trying to escape from you......


heehawbus 04-22-2010 04:31 PM

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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