A skip or drag in 3rd

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Jan 29, 2004 | 06:20 PM

Billdozer

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From: Montana

A skip or drag in 3rd

I just replaced my old C6 with a junker (money was an issue, I may have shoot myself in the foot...), it seems to run fine until I get on the hiway over 55. Then it feels like there is periodic drag in the drivetrain. The truck just seems to slow down for a second then it's back to normal. The fluid is fresh and full, the filter is also clean. I plan on replacing the vacuum modulator next week.

Any ideas on why this is happening?

Jan 29, 2004 | 06:37 PM

hdgapeach

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From: Franklin, GA

Is this only occuring at constant highway speeds on level road not during inclines or declines?

Jan 29, 2004 | 06:43 PM

Billdozer

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It does seem to go away under acceleration or load.

Jan 29, 2004 | 06:47 PM

hdgapeach

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From: Franklin, GA

sounds a lot like your egr valve. Try disconnecting the vacuum hose at the egr valve. Stick a golf tee or a screw in it to plug it off temporarily and go for a test drive. If the hesitation goes away, you found your problem. You may have manipulated the valve when you were swapping the tranny.

Jan 29, 2004 | 06:51 PM

Billdozer

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Ok, will do.

Jan 29, 2004 | 08:46 PM

hdgapeach

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From: Franklin, GA

Post your findings so I'll know if I'm an idiot or not, but mainly so we can get to the source of the problem.

Jan 30, 2004 | 07:49 AM

Billdozer

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From: Montana

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Feb 3, 2004 | 06:25 PM

Billdozer

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From: Montana

Checked all my vacuum lines, they seem to be good. I haven't replaced my modulator yet (screwed up my hand at work, it'll be a few days). Any other ideas?

Feb 3, 2004 | 07:10 PM

#10

hdgapeach

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From: Franklin, GA

Did you do the EGR check?

Feb 3, 2004 | 10:24 PM

#11

hdgapeach

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From: Franklin, GA

Before you replace the modulator valve on the transmission, plug the vacuum line that goes to the EGR valve. If it solves the problem, replacing the EGR valve will fix the problem. You can even leave the vacuum line plugged off until the hand heals up. Then replace the EGR valve. It won't hurt anything not being connected. If it works, the only side effect will be no more hessitation.