Engine Problem Help!! '80 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

cheyguy · 02-25-2003, 01:05 PM

I've got a problem and I'm not sure what to check next! My '80 4x4 has a 350 w/auto trans that starts fine, idles fine, runs fine till it shifts into 3rd, then the engine really boggs down. I took it to my trusted mechanic who said it was the tranny. Well $2000 later and a rebuilt tranny it still no better. But now when I accelerate above 40 mph or go up hill the engine sputters and revs (like a clogged fuel filter). I've changed the fuel filter, checked all the plugs and wires. I'm thinking I need to rebuild the carb but I'm not sure thats my problem. Any ideas are appreciated. Thanks, Mike

72CustomCamper · 02-25-2003, 01:09 PM

You mentioned it "sputters and revs". If it is revving up under load then something is definitely slipping somewhere...could still be your transmission.

Give us more info!

lpaine · 02-25-2003, 02:09 PM

Could possibly be a bad fuel pump(check pressure) or ignition timing out/not advancing probably something simple. Too bad about replacing your trans. I would suggest you consider getting another "mechanic" that knows how to troubleshoot problems, I think you would always check the simple things first.

JimKshortstep4x4 · 02-25-2003, 03:03 PM

If your fuel pump is good, check your in tank pick up filter. From what you are describing, it sounds like it is short on fuel.

Jim

wnc mountain · 02-25-2003, 04:03 PM

had an '80 a while back, sounded about the same. it was the fuel pump.

02-25-2003, 01:05 PM	#1
cheyguy Registered User Join Date: Oct 2002 Location: Manchester, TN Posts: 217	Engine Problem Help!! '80 I've got a problem and I'm not sure what to check next! My '80 4x4 has a 350 w/auto trans that starts fine, idles fine, runs fine till it shifts into 3rd, then the engine really boggs down. I took it to my trusted mechanic who said it was the tranny. Well $2000 later and a rebuilt tranny it still no better. But now when I accelerate above 40 mph or go up hill the engine sputters and revs (like a clogged fuel filter). I've changed the fuel filter, checked all the plugs and wires. I'm thinking I need to rebuild the carb but I'm not sure thats my problem. Any ideas are appreciated. Thanks, Mike __________________ '71 Cheyenne Super '80 Custom Deluxe '75 Blazer

02-25-2003, 01:09 PM	#2
72CustomCamper Registered User Join Date: Feb 2003 Location: Bremerton, WA Posts: 86	You mentioned it "sputters and revs". If it is revving up under load then something is definitely slipping somewhere...could still be your transmission. Give us more info! __________________ '72 GMC C20, "2500 Super Custom", Custom Camper, New 454 '93 K2500 Suburban, Old 454 (157K)

02-25-2003, 02:09 PM	#3
lpaine Registered User Join Date: Oct 2002 Location: Parksville, B.C. Canada Posts: 637	Could possibly be a bad fuel pump(check pressure) or ignition timing out/not advancing probably something simple. Too bad about replacing your trans. I would suggest you consider getting another "mechanic" that knows how to troubleshoot problems, I think you would always check the simple things first. __________________ 1969 G.M.C 3/4 Ton 920 (Canadian Version) 307 3 speed, currently apart 1998 Chevy 1/2 ton ex cab V-6 5 speed 1967 Chevy SWB - project truck; not started just yet

02-25-2003, 04:03 PM	#5
wnc mountain More hobbies than money! Join Date: Jan 2002 Location: Raleigh, nc, usa Posts: 655	had an '80 a while back, sounded about the same. it was the fuel pump. __________________ '70 cst10/swb 350, 3 on the tree, factory buckets. '70 GMC lwb 350/350 ps,pb '72 c-10 lwb 350/350 a/c, ps, pb '72 Blazer project

02-25-2003, 03:03 PM	#4
JimKshortstep4x4 Senior Member Join Date: Jul 2001 Location: Muskegon,MI,USA Posts: 6,026	If your fuel pump is good, check your in tank pick up filter. From what you are describing, it sounds like it is short on fuel. Jim



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