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86 fiero se 2.8 thermostat and exhaust manifold glowing red

Hi i replaced my thermostat and now it wont stay in its place it keeps turning sideways in the housing i dont get it and then it also hesitates at take off and after only running for a few minutes the exhaust manifolds turn bright red. I thought maybe the cat was pluged but i replaced it and it still does it what would cause these problems need help fast!!!! thank you Nick

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  • Fiero86SEv Mar 14, 2009

    i have the same problem. everyone i talk to says its a vaccume leak but there r no signs of one on mine i still have not found the problem. what i do know is ur engine is running too lean too much air is flowing through. try spraying carc cleaner around your intake and if your rpms shoot up and go back down replace your gaskets. hopefully yours is that easyy.



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SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi there,
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SOURCE: Bosch vacuum Motor turns off after a few minutes

It sounds like you have a motor protection fuse that resets after an overheat/cooling cycle.These work the same as a circuit breaker in your house with the difference being they can reset themselves.The Bosch will also shut down if there is insufficient airflow and I would check your filters first.1) Pull the filter and let the machine run.Do not pick up debris when you operate without a filter-it will be drawn straight into the motor.If it runs fine without shutting down, all you need to do is change your filter.If it shuts down again check the external hose for any blockages.Also check the throat from the powerhead for any blockages.If you continue to have the same problem then you will need to replace the fuse because at this point you have eliminated all the other likely problems.Good Luck-Scott

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SOURCE: red light stays on

It sounds like the plates inside the vacuum that detect the dirt have become dirty. I don't remember where they are, but I think they're accessible if you remove a certain hose. Again, I don't know which hose it is.

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SOURCE: 1997 F150 manifolds are glowing red

Sounds like cat convertors are clogged.

Posted on Jun 18, 2009

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SOURCE: exhaust manifolds glow bright red after driving 3

Check and make sure the catalytic converter is not plugged,or any part of the exhaust.

Posted on Dec 25, 2009

  • 1 Answer

SOURCE: roomba stutters on one wheel causing it to quit

Try setting the Roomba on the floor, powering it up, pressing down hard on the front, just above the front wheel, and hitting "clean" or "spot." My Roomba had the same problem, and this seems to do the trick for it. I think it has something to do with the Roomba thinking the front wheel is extended (which would indicate a cliff) even though it's really not.

If this doesn't work, you might try pressing down over whichever wheel doesn't turn when you turn the Roomba on.

Posted on Apr 21, 2010

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1 Answer

Catalytic converter

The exhaust downpipe is glowing red with heat?
To be honest, that may be fuel-air /and or cylinder head problem. A downpipe gets very hot, yes, but they don't glow red.

A faulty oxygen sensor can cause the catalytic converter to overheat - with disastrous results.

If you're not sure what you're doing don't mess around with things. get somebody who knows what they are doing to look at your car and give you an opinion

Feb 17, 2016 | 2006 Nissan Sentra 2.5

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Why the exhaust manifold turn on red?

Ok I beleive your asking why your exhaust manifold is turning red. If this is the case you probably have a blockage in your manifold, or the cat is clogged. somewhere the is an obstruction not allowing the exhaust gasses to escape properly and the temperature just keeps raising. You need to fix this right away! If I were you I would take the exhaust apart and clean it, or just replace it, then take off the manifolds and clean them out, if you do not find the obstruction then the cat is clogged and needs replaced!

Oct 12, 2012 | 1986 Pontiac Fiero

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Is it normal for v6 fieros exhaust manifolds to glow red at night

Yes, they are made of a very thin steel, so watch for cracks in them.

When the time comes, here is a good source for parts:

Hope this helps.

Oct 10, 2010 | 1986 Pontiac Fiero

2 Answers

1986 Pontiac Fiero V6 2.8L rebuilt..I started it up, within 45 seconds the exhaust manifolds turn bright red and start burning up. I triple checked the timing, it is idling a bit higher than normal still....

That is usually from a clogged catalytic convertor and/or the pre-cat or collector that sits in between the manifold and the cat. If you left the pre-cat on, remove it and see what the result is.

Jun 03, 2010 | 1986 Pontiac Fiero

1 Answer

Ok my 1986 Fiero 2m4 wont come out of reverse it was hard 2 shift gears all day yesterday until about 4 o clock now the transmission shifter just moves around freely but like i said its stuck in reverse...

Manual or auto?

It's gotta be the cable/linkage. You just have to inspect them and see if something is worn or snapped. They get old and crusty and need to be replaced eventually. I had to replace my shift cable on my 86 se with the 5-speed getrag.

Hopefully it's not the actual tranny....?

Apr 17, 2010 | 1986 Pontiac Fiero

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My 86 Fiero SE clutch master cylinder is weeping

Replace it. Not a difficult job. Be careful the bracket on the V6 4spd. isn't strong so don't break it while loosening the slave cylinder retaining nuts.

Good luck,

Rebel Faggioli

Dec 30, 2009 | 1986 Pontiac Fiero

1 Answer

96' toyota corolla Exhaust Manifold Keeps Cracking

Sounds weird that this problem keep occurring over and over. Does it crack in the same spot every time?

Only two things I can think of that would cause this problem.
1. Extensive over heating, I've seen a exhaust manifold get glowing red hot because of a bad oxygen sensor.

2. Excessive Vibration. The whole exhaust line to the back of the car is moving around too much or too stiff. The exhaust line needs to move around enough to take the movement/vibration of the engine. I would check out for bad motor mounts and worn out exhaust pipe mounts.

May 17, 2009 | 1996 Toyota Corolla

1 Answer

86 fiero thermostat and exhaust problem

The thermostat is held in place by a rubber seal around it and the access cap. One of those is allowing the thermostat to move freely.

The bright red manifolds indicate that combustion is occurring in the exhaust manifold. This is usually a retarded ignition timing issue. Check your timing and see if that helps the hesitation at idle.

Good luck,

Rebel Faggioli

Dec 20, 2008 | 1986 Pontiac Fiero

2 Answers


if that is dual exhaust and has seperate catylatic converters.... check that the one on that side is not plugged up.


Sep 10, 2008 | 1987 Pontiac Fiero

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