garrett3

when I push in the clutch to shift the rpms don't drop unless I wait about 5 seconds, but the clutch is not doing anything else wierd like slipping under acceleration. It feels good besides this. Any suggestions?

_JB_

iTrader: (33)

Maybe a vacum line has a crack or has come loose.

MeentSS02

iTrader: (11)

Sounds like a vacuum leak of some sort to me as well...

96slow6

When is the last time you check your air filter?

fuseone

well how quick should the rpms start droping because mine doesnt do it right way takes maybe a second or so but not no 5 seconds maybe 3 at the most

garrett3

the air filter is clean. There doesn't seem to be any pattern to it, Ive had it happen when it was cold,hot,high rpms,low rpms, and it will only do it once or twice then nothing for a week or so. Actually kinda helps on fast shifts

99kamarokid

iTrader: (5)

im having the same problem, do a search on rpms lagging... i started that thread, and there are a few suggestions in there...

formuhawk99

iTrader: (1)

Same thing here. It seems to be worse when the engine is cold. When I really notice it however is after I have been driving at a sustained speed for a while. When I get off of the freeway it seems to take a while for the RPM's to drop down again. My car has a naw cam, heads, intake, headers, FIPK and the AIR and EGR removed. Does this sound like a tuning issue as well?

delsold

iTrader: (7)

I'd think a vacuum leak of some sort too. Or maybe your crank position sensor is bad, or going bad, but i'd think that'd be more likely to cause a no start than a rpm drop lag.

Blk97WS6

iTrader: (19)

Ive had that problem ever since i got my car tuned for the cam. Im currently trying to track the problem down.

MeentSS02

iTrader: (11)

Your problem could be in the tune...I can get my RPMs to hang if I mess with the tune enough.

sdm1234

iTrader: (8)

my RPMs hang too after a PCMforless tune. if anyone finds a problem, please update!

PCMFORLESS

Typically this is caused by either an Idle air controller that is too low, meaning the throttle blades are open a bit too far or if you drilled the throttle body. Also a vacuum leak can do it. Also a TPS voltage a bit too high (.67 to .7 at idle works good) can do it as well. Also, there is an idle air decay table in the PCM that can be increased to try to get it to return to idle faster, but if there are the other mechanical issues mentioned above, the IAC decay won't help.

rubber duck

iTrader: (7)

Have you messed at all with the throttle body or put a new one on?