AUSSIE 302 cleveland running rough

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AUSSIE 302 cleveland running rough

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AUSSIE 302 cleveland running rough - 4/27/2005 12:58:23 AM

bundy351

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I NEED HELP. I HAVE A STOCK 302 CLEVELAND IN A 1977 F100 2WD AUTO UTE. IT HAS NO MODS EXCEPT FOR STANDARD FORD ELECTRONIC IGNITION. IT HAS A LOW DOWN MISS. I HAVE CHANGED PLUGS, LEADS, DONE A COMPRESSION TEST (110-120 PSI IN ALL 8 POTS) SWAPPED PLUGS AND LEADS AROUND, CHECKED TIMING, PULLED OFF A ROCKER COVER TO SEE IF ALL THE ROCKERS WERE MOVING (THEY WERE) AND DONE ALLOT OF HEAD SCRATCHING. I THEN STARTED PULLING LEADS OFF ONE BY ONE AND THIS IS WHAT I CAME UP WITH. NUMBER 1,4,6 AND 7 NO CHANGE. 2,3,5 AND 8 ENGINE RAN ROUGH. I THEN PULLED 1,4,6 AND7 ALL OFF AT ONCE AND THE ENGING DID NOT CHANGE. THIS TEST WAS CARRIED OUT AT IDLE IN PARK. I DONT KNOW MUCH HISTORY ABOUT THE ENGINE BUT IT LOOKS LIKE IT HAS BEEN REBUILT IN THE LAST FEW YEARS, IT BLOWS NO SMOKE AND IT STILL DRIVES AROUND OK. I CANT GET IN TOUCH WITH THE PREVIOUS OWNER TO SEE IF HE HAD THE SAME PROBLEM.

ANY IDEAS AT ALL WOULD BE GREAT.

THANKS bundy351

Post #: 1

RE: AUSSIE 302 cleveland running rough - 4/28/2005 5:16:45 PM

cctxfish

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What is the firing order you see on the intake manifold. I'm going to make this up as an example (but I think its close); 302, 1-5-4-2-6-3-7-8. I was replacing an engine in a mustang and had about the same problem but I found that the cam was different (it had the firing order from a Cobra's cam of the same year) and that the firing order had changed to; 1-5-6-3-4-2-7-8, you see the 4 number in the middle changed places.

(in reply to bundy351)

Post #: 2

RE: AUSSIE 302 cleveland running rough - 4/29/2005 1:36:47 AM

bundy351

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THE FIRING ORDER ID 1 - 3 - 7 - 2 - 6 - 5 - 4 - 8. BUT IF THE FIRING ORDER IS OUT WOULD IT BE BACK-FIRING? I THINK IT MIGHT BE A FUEL PROBLEM, WHEN YOU LOOK AT THE FIRING ORDER IS IS EVERY SECOND CYLINDER THAT IS NOT FIRING BUT WHEN I ARC OUT THE LEAD IT SPARKS A BRIGHT BLUE COLOUR ON THE BODY. I AM THINKING IT MUGHT BE A BLOCKAGE SOMEWHERE. THE MANIFOLD IS A DUEL PLANE 2 BARELL SET UP. I HAVENT LOOKED YET BUT IT MIGHT BE THE LOW PLANE THAT FEEDS THE CYLINDERS THAT ARNT FIRING. I WILL HAVE A GOOD LOOK THIS WEEKEND AND LET YOU KNOW.

bundy351

(in reply to cctxfish)

Post #: 3

RE: AUSSIE 302 cleveland running rough - 5/2/2005 3:30:37 PM

cctxfish

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Let us know what you find

(in reply to bundy351)

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RE: AUSSIE 302 cleveland running rough - 5/3/2005 7:24:15 PM

bundy351

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I AM 99.99% SURE IT IS THE CARBIE. I HAD A LOOK AT THE MANIFOLD AND THE 4 CYLINDERS THAT ARE NOT FIRING ARE FED BY ONE SIDE IF THE CARBIE AND THE ONES THAT ARE FIRING ARE FED BY THE OTHER SIDE. I SCREWED IN THE IDLE MIXTURE ON THE SIDE THAT IS FIRING AND THE ENGING RAN ROUGH AS EXPECTED (LEANED OFF). I THEN SCREWED IN THE OTHER SIDE AND NOTHING HAPPENED. I SCREWED IT IN ALL THE WAY AND NOTHING HAPPENED. I MUST HAVE A BLOCKED IDLE PORT ON THAT SIDE IF THE CARBIE.

BUNDY351

(in reply to cctxfish)

Post #: 5

RE: AUSSIE 302 cleveland running rough - 5/5/2005 1:56:45 AM

Ticky

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mate if i was you, i would drop a efi donk in her and go from there cause it is the fuel that makes it run rough

(in reply to bundy351)

Post #: 6

RE: AUSSIE 302 cleveland running rough - 5/6/2005 1:21:17 PM

cctxfish

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Bundy,
Good throbbleshooting!