bucks near WOT but no knock

dboyle23 · Oct 17, 2012

So, at the top end of any gear, my 2g bucks for a second and then continues to drive normally afterwards.

I have attached a log but I get only 1 count of knock.

I have had this problem for awhile. I have swapped out plugs, turbos, intercoolers, cams, injectors, since it began and the problem persists.

I have a 16g running 264 cams, fmic, 660's, and wally 255 not rewired.

Everything looks fine in the pull to me, what do you guys think the problem could be?

EclipsoGSX · Oct 17, 2012

I have the same problem and would like to understand why it's doing this. Like mentioned, it really only happens under WOT. It's a quick buck and then continues to drive normal. Also maybe related, when under a consistent speed of 45 and greater, I feel slight "bucks" at low to no boost levels.

98EVOECLIPSE · Oct 17, 2012

When it bucks, does it just do it one time, or continuously as you accelerate? My friends gsx jerks when he punches it, but it gets worse and worse the more he presses the gas. Doesn't do it at all when driving normally... No idea what causes it. Although he's not running a boost controller either, just let's off the gas at 20psi... Not sure if unregulated boost could be his issue. Interested to know if anyone knows the cause as well.

Imback · Oct 17, 2012

Weak spark would cause what your describing. I once had a problem very similar and went through everything. In the end it was the coil pack.

Cody Nelson · Oct 17, 2012

putting money on plug wires. they loose their internal resistance with age

DynastyLCD · Oct 18, 2012

Imback said:
Weak spark would cause what your describing. I once had a problem very similar and went through everything. In the end it was the coil pack.

^ This. I've had this same problem time and time again, with multiple DSM's... Only to change either the coil pack, or the transistor pack.

4g63t · Oct 18, 2012

Before you do anything, I would try a new set of br7es plugs and drop the gap to .20. I bet it goes away.

dboyle23 · Oct 18, 2012

I just put in some new plugs yesterday. I'll try narrowing the gap to .20, if that doesn't fix the issue then I'll go with some new plug wires. If all else fails, coil pack and transistor pack.

Thanks guys.

03RedSRT4 · Oct 18, 2012

I have experienced this "buck" before with two cars. My own, and another SRT owners.

My cause was found to be a cracked spark plug body. The spark plug was intact, however it had a crack on the porcelain, above the threads, near the wire.

In another car the cause was found to be an improperly torqued knock sensor. It was very loose.

EclipsoGSX · Oct 18, 2012

Thanks for the information everyone! I'll be narrowing this down soon. I'm going to start with the plugs. I'm not sure what brand was in it when I got it, but the wires are NGK.

The Top DSM Community on the Web

bucks near WOT but no knock

dboyle23

Attachments

EclipsoGSX

98EVOECLIPSE

Imback

Cody Nelson

DynastyLCD

4g63t

dboyle23

03RedSRT4

EclipsoGSX

Similar threads

Latest posts

Build Thread Updates

Vendor Updates

Latest Classifieds