Welcome to the DoItYourself Forums!

To post questions, help other DIYers and reduce advertising (like the one on your left), join our DIY community. It's free!

'81 chevy truck misfiring


boman's Avatar
Member

Join Date: May 2001
Posts: 487

10-07-02, 04:24 PM   #1  
'81 chevy truck misfiring

'81 Chevy 1/2 ton 6cylinder

Misfires when changing into high (drive) with 3 speed auto tranny.

Seems like it wants to shut off until you let off the accelerator.

Comments appreciated.

 
Sponsored Links
bejay's Avatar
Member

Join Date: Dec 2001
Posts: 2,538

10-07-02, 06:54 PM   #2  
could be alot of things, might check cap and rotor , might also see if it acts up with vacum advance unplugged.

 
Joe_F's Avatar
Visiting Guest

Posts: n/a

10-07-02, 07:34 PM   #3  
Joe_F
I agree. Might have frozen advance weights.

 
boman's Avatar
Member

Join Date: May 2001
Posts: 487

10-08-02, 04:24 AM   #4  
Thanks guys, I had also suspected the spark advance. I think this old truck had been sitting for a while before I got it. Changes into second fine, but when it goes into drive, ....

It also may need a modulator valve. It seems to not want to shift into drive until it is going about 50. I'll piddle around with it and see what it takes to straighten it out.

 
Search this Thread