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Title: Bucking driving me mad plz hlp
Post by: 88cat on December 17, 2009, 11:39:01 PM

I have been having trouble with my 5.4 driving 40-60mph it bucks real bad under light throttle but at wot it wont do it. It really is driving me mad the only mods ive done is custom cai exhaust what can the problem be? Thanks lmk

Title: Bucking driving me mad plz hlp
Post by: 88turbo on December 18, 2009, 09:51:19 AM

hey buddy, long time no see!! check your throttle position sensor sweep and make sure you have no broken areas or spikes. not sure what vehical this is give us alittle more info.

Title: Bucking driving me mad plz hlp
Post by: 88cat on December 18, 2009, 11:22:59 AM

Hey man long time ive been out with another project but i still have my birds. The vehicle is a 99 f250 5.4l super duty ill post some pics later on.

Title: Bucking driving me mad plz hlp
Post by: TurboCoupe50 on December 18, 2009, 11:36:07 AM

Clean the MAF...

Title: Bucking driving me mad plz hlp
Post by: 88turbo on December 18, 2009, 12:53:46 PM

doh!!! forgot about the MAF lol

Title: Bucking driving me mad plz hlp
Post by: 88cat on December 18, 2009, 01:05:57 PM

I just cleaned the maf with the special maf cleaner so thats not it.

Title: Bucking driving me mad plz hlp
Post by: 88CougarGT on January 03, 2010, 06:21:24 PM

I had this problem when I was using the wrong MAF on my 5.0L. I had the same problem as you describe. What Mods have you done to the engine and what programming are you running?

Title: Bucking driving me mad plz hlp
Post by: Bruce M on January 03, 2010, 08:09:50 PM

I had the same problem with my 5.0 cougar. It was a bad egr valve. I blocked it off and it runs great.

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Technical => Engine Tech => Topic started by: 88cat on December 17, 2009, 11:39:01 PM