Fixed exhaust now runs aweful, HELP!!! - The 1947 - Present Chevrolet & GMC Truck Message Board Network

gloriavoxdei · 01-04-2011, 11:56 AM

Help me out here guys. I'll give you the whole dumb story. 2 weeks ago I pulled the driver side exhaust manifold to remove the gasket due to a bad leak. I got the head and manifold nice and gasket free and then reinstalled the maniflod. The truck then leaked like crazy and ran like crap at low RPM but okay at upper RPMs. Well, I replaced the manifold gasket and flange gasket Sunday and it started up and ran fine although I was not able to drive it. I went to leave for work at 6 this morning and after idling low for 10 min I could not get the 454 to rec without floooring it. I also noticed a popping coming from the driver side exhaust pie (true) duals). The truck ran fine before, what do you guys think?

swampfox · 01-04-2011, 12:26 PM

You might have a couple plug wires crossed ,if they where removed when working on it.

**old Rusty C10** · 01-04-2011, 01:09 PM

rxactly what im thinking are you sure the exhaust pipes are clear and nothing is blocked ip?

JuicyJ · 01-04-2011, 02:14 PM

It would be a good idea to check your plugs also and make sure none are cracked. This can lead to a misfire. This has happened to me.

Buick455 · 01-04-2011, 02:18 PM

I would vote for plug wires too but I am also wondering what the cause of blowing two exhaust manifold gaskets? Are you sure you have no blockage in the exhaust? This would also make it run like crap.

01-04-2011, 11:56 AM	#1
gloriavoxdei Registered User Join Date: May 2010 Location: Florissant, CO Posts: 97	Fixed exhaust now runs aweful, HELP!!! Help me out here guys. I'll give you the whole dumb story. 2 weeks ago I pulled the driver side exhaust manifold to remove the gasket due to a bad leak. I got the head and manifold nice and gasket free and then reinstalled the maniflod. The truck then leaked like crazy and ran like crap at low RPM but okay at upper RPMs. Well, I replaced the manifold gasket and flange gasket Sunday and it started up and ran fine although I was not able to drive it. I went to leave for work at 6 this morning and after idling low for 10 min I could not get the 454 to rec without floooring it. I also noticed a popping coming from the driver side exhaust pie (true) duals). The truck ran fine before, what do you guys think? __________________ 1978 GMC Jimmy, 400, th350, np203 with part time conversion, Fibrecraft popup camper, soon to get a 14 bolt/d44 swap 2001 Yukon XL2500, 6.0, 4L85E, 4x4, family truckster

01-04-2011, 12:26 PM	#2
swampfox Registered User Join Date: Sep 2010 Location: nw arkansas Posts: 41	Re: Fixed exhaust now runs aweful, HELP!!! You might have a couple plug wires crossed ,if they where removed when working on it. __________________ 69 gmc 4x4 lwb 327 4sd not running Last edited by swampfox; 01-04-2011 at 02:14 PM.

01-04-2011, 01:09 PM	#3
old Rusty C10 Robert Olson Transport Join Date: Oct 2002 Location: recent transplant to NC USA Posts: 20,297	Re: Fixed exhaust now runs aweful, HELP!!! rxactly what im thinking are you sure the exhaust pipes are clear and nothing is blocked ip? __________________ Bob 1951 International running on a squarebody chassis "If a man's worth is judged by the people he associates himself with, then i am the richest man in the world knowing some of the fine people of this board" http://67-72chevytrucks.com/vboard/a...t.php?f=25&a=9 (you can review the site rules here!) PM Me for your vehicle/parts hauling needs in the North East US or see my Facebook page Robert Olson Transport Live each day to the fullest.. you never know when fate is going to pull the rug out from under you... I hate cancer!!

01-04-2011, 02:14 PM	#4
JuicyJ Registered User Join Date: Jun 2010 Location: San Antonio, Texas Posts: 123	Re: Fixed exhaust now runs aweful, HELP!!! It would be a good idea to check your plugs also and make sure none are cracked. This can lead to a misfire. This has happened to me. __________________ America is all about speed, hot nasty bad ass speed

01-04-2011, 02:18 PM	#5
Buick455 Registered User Join Date: Mar 2010 Location: Amherst VA Posts: 150	Re: Fixed exhaust now runs aweful, HELP!!! I would vote for plug wires too but I am also wondering what the cause of blowing two exhaust manifold gaskets? Are you sure you have no blockage in the exhaust? This would also make it run like crap.



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