72 Jimmy w/HEI Wont Stay Timed! - The 1947 - Present Chevrolet & GMC Truck Message Board Network

gweav3 · 05-15-2011, 09:37 PM

HELP!!

My 72 Jimmy with a stock motor-except for the HEI from a later year stock motor-wont run.

I just replaced the entire wiring harness with a Painless #10206 for 67-72 GM trucks. Now I have replaced the HEI with another stock unit (not MSD, Accel or the like) and it wont run worth a damn. I timed the motor to 10 degrees BTC with the vaccum hose removed (and plugged). I confirmed I was at TDC of the # 1 piston and nothing mechanical changed. All the wiring works and I went overboard on getting everything grounded.

The motor will run for a while (but lacks power) but then starts to misfire as it warms up. The distributor cap also wobbles and I dont know what that is about. I have run out of ideas so....

Any suggestions?

05-15-2011, 09:37 PM	#1
gweav3 Registered User Join Date: Mar 2011 Location: Santa Rosa, CA Posts: 11	72 Jimmy w/HEI Wont Stay Timed! HELP!! My 72 Jimmy with a stock motor-except for the HEI from a later year stock motor-wont run. I just replaced the entire wiring harness with a Painless #10206 for 67-72 GM trucks. Now I have replaced the HEI with another stock unit (not MSD, Accel or the like) and it wont run worth a damn. I timed the motor to 10 degrees BTC with the vaccum hose removed (and plugged). I confirmed I was at TDC of the # 1 piston and nothing mechanical changed. All the wiring works and I went overboard on getting everything grounded. The motor will run for a while (but lacks power) but then starts to misfire as it warms up. The distributor cap also wobbles and I dont know what that is about. I have run out of ideas so.... Any suggestions?



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