Need help with my distributer firing order - The 1947 - Present Chevrolet & GMC Truck Message Board Network

77Vandura4x4 · 01-10-2007, 04:18 PM

Just rebuilt my 350 from my 1977 Gmc Vandura 4x4, and noticed it wasnt running right. So while it was running, i pulled the plugs one by one from the distributor and noticed no change in engine performance on plugs 1 7 6 and 4. The distributor is producing the electrical current, but those cylinders arent firing. I did a compression test and they all are at 150. What do u think the problem is?

OJOE · 01-10-2007, 08:48 PM

make sure firing order is correct, ck for vacum leaks,may want to spray some wd40 around intake to ck for leaks. maybe some of this will help

lurch115 · 01-10-2007, 09:13 PM

i've had 2 plug wires switched around and the motor run....thats what i get for having a friend help me to a tune-up... the other thing to look for is to make sure that the coil hold-down screws aren't poking through the underside of the distributor cap...cause that will cause the rotor to short out before it makes contact with the terminal right after it... course that is if your truck has an HEI dist. on it....

01-10-2007, 04:18 PM	#1
77Vandura4x4 Registered User Join Date: Dec 2006 Location: Canada Posts: 16	Need help with my distributer firing order Just rebuilt my 350 from my 1977 Gmc Vandura 4x4, and noticed it wasnt running right. So while it was running, i pulled the plugs one by one from the distributor and noticed no change in engine performance on plugs 1 7 6 and 4. The distributor is producing the electrical current, but those cylinders arent firing. I did a compression test and they all are at 150. What do u think the problem is?

01-10-2007, 08:48 PM	#2
OJOE Crew Cut Join Date: Dec 2005 Location: MONTGOMERY,AL Posts: 757	Re: Need help with my distributer firing order make sure firing order is correct, ck for vacum leaks,may want to spray some wd40 around intake to ck for leaks. maybe some of this will help __________________ 85 SWB 1/2 TON CREWCAB/5.3 03 CHEV 3500 DURAMAX CREW CAB 85 CHEV SWB/TPI 06 CHEV TAHOE (WIFES) 30 MODEL A HOT ROD 07 HARLEY DAVIDSON BAGGER 09 STREET GLIDE AN D A LOT MORE JUNK Last edited by OJOE; 01-10-2007 at 08:51 PM.

01-10-2007, 09:13 PM	#3
lurch115 Registered User Join Date: Oct 2006 Location: iowa Posts: 722	Re: Need help with my distributer firing order i've had 2 plug wires switched around and the motor run....thats what i get for having a friend help me to a tune-up... the other thing to look for is to make sure that the coil hold-down screws aren't poking through the underside of the distributor cap...cause that will cause the rotor to short out before it makes contact with the terminal right after it... course that is if your truck has an HEI dist. on it.... __________________ "Horsepower is how fast you hit the wall, torque is how far you carry the wall with you." '84 chevy half ton short box 2wd, 67,000 actual miles '03 chevy 1500 HD crew cab 4x4 standard box, 6.0L



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