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Car bucking when hitting 4k WOT

Old 04-24-2005, 10:07 PM
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Default Car bucking when hitting 4k WOT

I'm being tuned with uberdata and me and my tuner were working on it and did two 3rd gear pulls. And everyrthing was fine. But then on the third one, the car started to buck like it was stalling out at 5k rpms. And we tried everything to fix it. I'm going to try and get Matt to post in here also and tell you what happened (he's tuning it)

I used to have a VAFC but got rid of it. Could the way the VAFC was wired cause any problems with Uberdata? We are out of ideas other than the wiring. Any help would be appreciated.

If you need any specs on the car or the turbo components please tell me.
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Old 04-24-2005, 11:48 PM
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Default Re: Car bucking when hitting 4k WOT

any cel?
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Old 04-25-2005, 07:18 AM
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Default Re: Car bucking when hitting 4k WOT

Did you tighten up your plug gap or even install new plugs? 99% sure that is your problem.
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Old 04-25-2005, 07:59 AM
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Default Re: Car bucking when hitting 4k WOT

Originally Posted by Ravage70
any cel?
No
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Old 04-25-2005, 08:11 AM
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Default Re: Car bucking when hitting 4k WOT

Originally Posted by CSaddict
Did you tighten up your plug gap or even install new plugs? 99% sure that is your problem.
I didn't do the install, so I would have to ask. But if not how would I go about doing this? I've never heard of this or anything, so could you explain it somewhat? THanks, I'm trying to learn all I can so I can do the install myself next time.
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Old 04-25-2005, 08:31 AM
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Default Re: Car bucking when hitting 4k WOT

Search GOOGLE on "How to Properly Gap Spark Plugs"
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Old 04-25-2005, 08:45 AM
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Default Re: Car bucking when hitting 4k WOT

Alright figured it out, if I don't need new spark plugs, what should be a good gap size? And I've heard good things about NGK spark plugs, should i get those if new ones are needed?
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Old 04-25-2005, 11:05 AM
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Default Re: Car bucking when hitting 4k WOT

Cant go wrong with .030, one or two step colder NGKs havent let me down. Denso's work ok too but generally foul out quicker and start misfiring more easily than the NGKs
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Old 04-25-2005, 11:30 AM
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Default Re: Car bucking when hitting 4k WOT

http://www.sparkplugs.com/more_info....15733&pid=2530

Do these seem fine? Any better websites to get them at? And how much do spark plug gap tools run? Thanks and sorry for all these questions. I just need to make sure this is right.
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Old 04-25-2005, 12:38 PM
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Default Re: Car bucking when hitting 4k WOT

Bucking can also be caused by the engine runing out of gas.
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