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Sorry if this has been covered before, but searching in the forums seems to be disabled so I can't check.
I was getting on the freeway this morning accelerating hard in third gear. I was keeping an eye on the tach when at about 6000rpm it seemed to me that the rev limiter kicked in. I lost loads of power and all acceleration pretty much stopped.
I've hit the limiter in the past by mistake (forgot to shift out of second while passing a truck on a hill) and this felt pretty much like it. But, I rarely push the car into those revs (I don't race), so I'm not sure what's the expected behavior once you get around 6000.
Has anyone noticed this behavior?
By the way, I have a '99 996 C2 Cab.
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larry
Rev limiter in my 78 seems to be "predictive". If the engine RPM is climbing rapidly the rev limiter kicks in, HARD, (BLAM!! damn, I just broke something really serious) and at an earlier point. If I ease the RPMs upwards then the rev limiter just starts "niggling" the torque off.
Would you believe that at over 10k miles and two years I don't remember ever having encountered the rev limiter in my 01 C4.
Then of course the 78 needs the RPMs to "pull", while the 01 doesn't.
Larry, is your engine stock or do you have a piggy back chip perhaps? I've had this happen to me with the TRG Unichip when it got overheated.
Do you have a check engine light on? Under some CEL conditions, the DME will go into limp mode which reduces power and limits rpms.
If neither of these, maybe you got a batch of bad gas and the DME was limiting rpm to avoid knock.
Karl
Back-firing is most likely due to intake valve "float", also most likely to occur at high engine RPM. Your valves have two springs, I think the inner one is there specifically to prevent high RPM float.
You only need one spring failure, one floating intake valve, to ignite the entire mixture in the intake plenum.
This definitely sounds unusual. My engine revs cleanly all the way to 7200
rpm. Has great sound and power over 6k. I would have this checked out if it persists.
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