What is the most common problem turning the exhaust manifolds glowing red in a short period of running time,? had the problem in a previous Fiero but don't remember what caused it or how I fixed it. Just did an engine swap and have not driven the car yet.Does the computer reset? Cat? Timing? EGR? Help!!

might be your o2 sensors I had that happen in my truck they where backwards and just sitting in the driveway running they got cherry red. When my truck got fixed they put the wires on backwards. once that was fixed all better.

Most common issue with red hot glowing manifolds is ignition timing too retarded

Most common reason the ignition timing is too retarded is someone set it without jumpering A-B

The other thing that could cause the ignition timing to be too retarded is a slipped dampener ring

Note - a 'slight glow' that can be seen only at night isn't uncommon.

A big vacuum leak that's causing a lean condition. I ran into this on a previous build. My leak was the breather tube under the throttle body neck of the upper intake.

02

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1:
Glowing Manifolds? -- Define GLOWING (Archive: TD&Q - by grinthock, started: 08-30-2001, last post: 2002-02-08 14:46:55 CET)
Hey everyone (and skitime!)Ok some of you have read my issues over the last week.... So far here is what's been fixedClogged EGR Tubereplaced EGR ValveReplaced cracked front manifoldnew plugsnew wiresnew capnew rotorAll that's been done, drove her tonight and she is runnin pretty nice, took her out...
Score: 1000, Size: 48 bytes

2:
glow, manifold, glow!!! (2.5L) (Archive: TD&Q - by tednelson83, started: 08-01-2003, last post: 2004-02-23 13:37:22 CET)
why is it that when my timing is at 18* the exhaust man. is fine, and the engine runs great, but when the timing is at 8* (factory spec) the manifold glows and the engine rides rougher?
Score: 1000, Size: 46 bytes

3:
glow, manifold, glow!!! (2.5L) (Archive: TD&Q - by tednelson83, started: 08-01-2003, last post: 2003-11-10 11:06:11 CET)
why is it that when my timing is at 18* the exhaust man. is fine, and the engine runs great, but when the timing is at 8* (factory spec) the manifold glows and the engine rides rougher?
Score: 1000, Size: 46 bytes

4:
glowing exhaust manifolds (Technical Discussion & Questions - by Wayne Renninger, started: 11-12-2010, last post: 2010-11-14 04:26:14 CET)
What is the most common problem turning the exhaust manifolds glowing red in a short period of running time,? had the problem in a previous Fiero but don't remember what caused it or how I fixed it. Just did an engine swap and have not driven the car yet.Does the computer reset? Cat? Timing? EGR?...
Score: 775, Size: 41 bytes

5:
Glowing exhuast manifolds (Technical Discussion & Questions - by x-thumpr-x, started: 10-20-2009, last post: 2009-10-24 05:38:13 CEST)
My father & I recently rebuilt a stock 2.8L motor, gasket matched the intake & heads. Installed crane lifters and regrind cam to comp's 260H. We've set the timing to 10 degree's in diagnostic mode, runs about 20 degrees in ALDL mode. We first noticed BOTH manifolds glowing during timing the motor...
Score: 775, Size: 36 bytes

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Fiero 2.8 exhaust manifold is getting RED (glow). (Technical Discussion & Questions - by Fieray3800, started: 05-02-2010, last post: 2010-05-03 15:31:51 CEST)
yes another post. Man do i have a lot of questions.ok, when i 1st got this car the exhaust manifold were getting RED i mean a real nice glow.i did a bunch of stuff to the engine tune-up related. well, this helped and the bright glow is gone but, it still gets a little red.
Score: 775, Size: 60 bytes

7:
Glowing exhaust manifolds (Technical Discussion & Questions - by Indiana87GT, started: 01-06-2010, last post: 2010-01-09 20:17:06 CET)
I've had my transmission rebuilt, put all new parts in the suspension and drivetrain and exhaust, got it all put back together and took it for a short test drive of maybe a half mile, not even long enough for the engine to fully warm up. I'm still burning off paint, oil, grease etc. from working...
Score: 775, Size: 37 bytes

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Glowing Exhaust Manifolds.... (Technical Discussion & Questions - by 1986Fiero, started: 10-23-2009, last post: 2009-10-24 22:28:19 CEST)
I have a 2.8l v6 4 speed. New motor just put in. The exhaust manifolds are glowing orange. Is this a cause from a vacuum leak or timing isnt right. I know the timing isnt right but when i get it right will they still glow?
Score: 775, Size: 39 bytes

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Popping and glowing manifold (Technical Discussion & Questions - by TeamPontiac88, started: 05-30-2010, last post: 2010-06-05 02:52:38 CEST)
Hi, My 87se 2.8 starts right up, idles fine but the manifolds turn red and if i touch the throttle it will hiccup and pop through the air cleaner. I dont see any vac leaks... any suggestions? Thanks, you guys are the best!
Score: 775, Size: 42 bytes

10:
exhaust manifolds glow red within 5 min (Technical Discussion & Questions - by cyphersync, started: 11-03-2010, last post: 2010-11-04 03:30:01 CET)
exhaust manifolds glow red within 5 min of starting my 86 gt. and i know its not a clogged up exhaust because its straight pipe out. i was thinking it might be lean cylinders any ideas?
Score: 775, Size: 51 bytes


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I vote for #4

I've searched here and many other forums, as well as the general internet, and none of the resulting matches seem to be able to descirbe what might be wrong with the problem I'm having. Not sure about the OP, but the behavior on my 2.8 with the insane EGTs I'm seeing aren't easily explainable by any of these.