Exhaust Manifold Glows
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Exhaust Manifold Glows
1984 F-150 4X4 300 I6 - Please help. When I open the hood after I've been driving (usually only about 15 miles from work) @ normal speeds 55-60 my exhaust manifold is glowing. When I shut the truck off after driving @ higher speeds it will backfire everytime. Usually not very loud. Timing was set by a local shop 10 deg. before TDC. I've got EFI manifolds with duels & turbo mufflers. Stock intake with 1bbl Carter carb. The carb is a reman that's only had about 1-2 months use. After I put on the carb, I could not get it set right so I took it to a shop. That's where he set the timing & adjusted the carb. Fuel mileage is not that great either. New fuel pump. Sounds like it's running a little rich, can't afford to take it back to the shop. What do I need to do?
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From: Phoenix USA
Check your timing again. I had the same thing happen to me two weeks ago when I was breaking in a newly rebuilt 302. I had the timing retarded. It sounds like to me that the shop you went to set it ten degrees ATC.
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From: Muskegon, MI (home)
I had the same thing happen to me! I just got done installing a brand new 2 barrel Holley carb and Cliffords 2bbl adapter plate. I decided to take er out for a spin after work one night. I let it warm up for a few minutes and then took off, I stepped on er a little bit and she stumbled and lugged down. It ran okay just didn't have much power. After about a mile or so I started to smell something burning, so I pulled over and popped the hood to find the manifolds glowing. I shut er down and let it cool off. I had my girlfriend tow me home with my other truck. The timing is dead nuts right on the money, all I can think of is I am running way too lean. She idles smooth as silk, and the throttle response is pretty good accept under load (when in gear) I know a few guys on this site are running this same set up, has anyone else experienced this problem after making a carb swap? When I figure out my problem I'll let yall know what it was any suggestions are appreciated!
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That truck doesn't have an EGR system on it does it? I know some carbed trucks do, but if it does that might be the problem. Your combustion temps can get up there otherwise, and you would think this would be especially true if it was originally on there and removed.
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From: dundalk md
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From: Muskegon, MI (home)
My truck doesn't have the EGR system on it either. It did when I had the stock carburetor, but it wasn't hooked up to anything. She ran like a swiss watch, heck you could set a glass of water on the hood and it wouldn't even splash. I had to remove the EGR block in order to install the 2 barrel adapter plate, because of hood clearance problems. The adapter plate was approximately the same thickness as the EGR block, so clearance shouldn't be an issue. A couple of my buddies who are both ASE certified think it's a lean condition, I'll try it tonight after work and see what happens.
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Just a reminder. 84' F-150 I6 - EFI Manifolds with stock intake & reman. carter 1bbl 2" duels all the way out w/ cheap turbo mufflers - EGR system plugged - Ex. manifolds glow after driving about 15 miles @ highway speeds - Does anyone think that if I put my EGR system back together, it might help the problem i'm having? Most of the time the truck runs great, but when I've been driving pretty fast or just really taking off fast it kinda hesitates & loses power for a second then when I let off the gas it's ok. Like it's getting way too much fuel too quick. Is this normal? Also, I had the pleasure of hearing my truck drive by me @ about 50 mph, I thought it was a tricked out Honda by the way it sounded. Any ideas to get a little more throughty sound & a little less buzz @ higher rpms? I've been told to get rid of the 2 muffler system & Y before the muffler & go with a high flow (Flowmaster, Dynaflow, etc) muffler 1 in & either 1 or 2 out. Please help, I'm tired of having Hondas pull up beside me & want to race ricer vs. ricer. Thanks
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Does anyone think that if I put my EGR system back together, it might help the problem i'm having?.....
Couldn't hurt...If your pipes are glowing, you are running too lean, which causes excessive combustion chamber temps. Also, check for carbon....If you had a load of carbon in the engine, that can cause a lean condition, as the carbon can soak up fuel vapor..
You need to find out why it's running so lean, before you melt a hole in a piston. The EGR system will lower the combustion temps a bit, by mixing in the cooler exhaust gasses...So it will help. But that may not be the only problem...Probably isn't...MK
Couldn't hurt...If your pipes are glowing, you are running too lean, which causes excessive combustion chamber temps. Also, check for carbon....If you had a load of carbon in the engine, that can cause a lean condition, as the carbon can soak up fuel vapor..
You need to find out why it's running so lean, before you melt a hole in a piston. The EGR system will lower the combustion temps a bit, by mixing in the cooler exhaust gasses...So it will help. But that may not be the only problem...Probably isn't...MK
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