Stumbles when accellerating hard

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Jan 30, 2008 | 04:34 PM

barker2036

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From: Texas

Stumbles when accellerating hard

I have a 97 6M, that drives like a champ until I get put the pedal to the floor, that when it stumbles (well below red line) like it is hitting the rev limiter. I just changed plugs and wires to correct this, but the problem still exists. Any ideas?

Jan 30, 2008 | 05:09 PM

BowTieRocket

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From: Chico CA

Traction control? That's the obvious guess, though your post doesn't indicate what you're doing beyond standing on the gas. Traction control works by de-powering the engine, so you get a stumble.

That's my best guess. If you're under hard acceleration, and losing traction, try turning TC off with the button on the console. Easy check, and if that's it, well, you have a cheap answer.

Good luck!

Jan 30, 2008 | 05:38 PM

zo6_yellow

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I am having the same problem with my 01, but I will try with TC off. Thanks

Jan 30, 2008 | 07:59 PM

barker2036

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From: Texas

Took the TC off and problem still exists. Its only when I put it to the floor from 25mph on, I havent tried from a dead start but am sure I will get the same response. Any ideas?

Jan 30, 2008 | 10:26 PM

BowTieRocket

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From: Chico CA

Quote:

Originally Posted by barker2036

Took the TC off and problem still exists. Its only when I put it to the floor from 25mph on, I havent tried from a dead start but am sure I will get the same response. Any ideas?

Sorry it didn't help. That was my one shot. Check the plug gap. I've seen that cause stumbling.

There are some clever folks on this forum. Maybe a better one will jump up. For me, I like the plug check. My Shelby had this little problem, just like you're describing. Turned out the plugs were gapped way wrong. That was enough. New engine, too. I just got in a hurry (or got sidetracked) and forgot to check the gaps before installing. Regapped, and as Mazda says, zoom zoom zoom.

Good luck. If no codes, it's probably something pretty straightforward. Oh, if the plugs are too light, you may be running lean. That will cause the symptom you're seeing, too. Do check the codes - there are instructions here on the forum, for just a quick search ("read codes" or something similar).

I rented a new Shelby last year. When it ran up against the rev limiter or the traction control, it stumbled just like you describe. Just went out and got into my car a little - second gear and the trac control did it again. It was a guess, but one I've seen personally.

I'll keep looking for your results.

Jan 30, 2008 | 10:44 PM

RdDragn2

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What codes are you throwing if any?

It could be a lot of things. Such as a knock sensor, or many other things.

Here is a link on how to read your codes if you don't already know:
http://www.97vette.com/howto/codes/index.html

Jan 31, 2008 | 10:14 AM

0Slowhawk

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Joined: Jun 2002

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From: Bridgewater Ma

Could be anything.You need someone to scan it while driving.I've seen alot of older cars have bad MA meter's which will do this or you could have a bad coil. If I had my scanner on it I could tell you in less than 5 minutes.

Jan 31, 2008 | 11:18 AM

BlackZ06

Safety Car

Joined: Aug 2000

Posts: 4,933

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From: San Rafael CA

Quote:

Originally Posted by barker2036

Which plugs and wires did you put in, and what plug gap?

Take a look and see if the PCM has posted any codes ... if you don't know the procedure, go here ....

https://www.corvetteforum.com/techti...D=26&TopicID=1

Be sure to post the entire code, such as P0300C

I'd also check for any air leaks between the MAF (located above the radiator) and the throttle body (located on the front of the engine). Air leaking in is "unmetered" air, and will cause the engine to run lean, making it feel like it is stumbling. It may be that the higher vacumn at WOT is opening up the "leak". Main thing, though, check for codes.