Engine misses at high RPM

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Feb 13, 2002 | 07:58 AM

suzukrider

Thread Starter

5th Gear

Joined: Feb 2002

Posts: 5

Likes: 0

From: woodbridge va

Engine misses at high RPM

My 88 coupe is a little under the weather, when I get up to 70-75 MPH my car starts to miss (fishbite), I replaced the plugs, distr cap, ignition module, wires, rotor button and vacum line running to the EGR valve and its still doing it. I just had Chevy replace the intake manifold gasket and the clutch in Dec, so I was thinking that they could have disconnected something.Can some one please help me.

[Modified by suzukrider, 2:59 AM 2/15/2002]

Feb 13, 2002 | 10:45 AM

PonyH8R

Drifting

Joined: Jul 2001

Posts: 1,595

Likes: 0

From: Chino Valley AZ

Re: Engine misses at high RPM (suzukrider)

Mine does too so I would be interested what suggestions people come up with on this topic.

Feb 13, 2002 | 10:52 AM

flubuyu2

Instructor

Joined: Jan 2002

Posts: 172

Likes: 0

From: Garland TX

Re: Engine misses at high RPM (suzukrider)

I have the Lt1 so I'm guessing here but since you've already done ignition maybe it's fuel starvation under high rev's???let me know very curious!

Feb 13, 2002 | 10:56 AM

Nathan Plemons

Race Director

Joined: May 2001

Posts: 14,165

Likes: 9

Re: Engine misses at high RPM (suzukrider)

My old car developed a miss that NOBODY could track down. For those who have never experienced it, a miss on a 4-cyl is painful. I hope you get it worked out, I sold the car for it. Poor guys at the dealership didn't even test drive it :D

Feb 14, 2002 | 11:07 PM

suzukrider

Thread Starter

5th Gear

Joined: Feb 2002

Posts: 5

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From: woodbridge va

Re: Engine misses at high RPM (suzukrider)

I was informed by Chevy that my engine was not missing, that at high RPM my car was going in and out of overdrive. As I think about it, it did fell as if it was downshifting at times and I did notice that the shift light came on once. I seen a articial in VETTE on how to by pass this function maybe I will try that. Thanks I hope this can help other Vette luvr's.

Feb 25, 2002 | 01:09 PM

PonyH8R

Drifting

Joined: Jul 2001

Posts: 1,595

Likes: 0

From: Chino Valley AZ

Re: Engine misses at high RPM (suzukrider)

Hmmmm. Not sure that is the same with me then. Mine misses when I WOT it and continues until I let off. :confused:

Feb 25, 2002 | 05:48 PM

CORVETTE MIKE

Racer

Joined: Dec 2000

Posts: 290

Likes: 0

From: harrisburg pa. usa pa

Re: Engine misses at high RPM (suzukrider)

When i had my 89 it did the same,it turned out to be catalytic converters gone bad.

Feb 25, 2002 | 06:05 PM

emoshn

Burning Brakes

Joined: May 2001

Posts: 790

Likes: 2

Re: Engine misses at high RPM (CORVETTE MIKE)

Could also be valve spring tension. Weak valve springs will cause a high rpm miss. So will low fuel pressure. Check your pump pressure and you fuel pressure the the injectors. Could be a bad regulator.

Just as a thought. I had an all around poor running engine...wanted to stall at idle...wouldn't run up very well etc. Had a motorvac done on the engine. This cleans all things fuel...including valves/combustion chamber/plugs. Ran great afterwards...$100.