why would my exhaust manifold be glowing red hot?
What type of driving are you doing? It takes a lot of heat to get manifolds glowing. Usually happens under very heavy loads for extended periods of time.
right, and or they might be clogged. Do you have drivability problems, such as the car not going over a certain RPM or speed?
Never heard of clogged manifold........explain
Could be a clogged catalytic converter.
Sounds like a clogged up catalytic converter to me. Manifolds do get hot to touch but not normal to glow unless the exhaust from the engine isn't leaving thru the exhaust pipes fast enough. Converters can clogg up to the point of the car either not running at all or running very rough. If that manifold is glowing, it's probably at 900-1000 degrees and it's too hot to drive and could cause a fire and burn up your car and possibly with you in it. Call an exhaust repair place like Meinke or MIdas or Car-X and see if they think you can drive it in or should you have it towed. If one is very close by by only a few blocks then it should be OK to drive it when the engine is cooled down from the night before but not if it's farther away or the engine is already warm or hot. I myself would just have it towed in just to be safe. You don't want to be in a car that catches fire. It can explode with you in it very quickly if that manifold is glowing. Call the exhaust repair shop and make an appointment, but call a towtruck first, that's what they are there for. to move your car safely. Good luck, Kenny.
its simple its clogged up change your manifold end of problem.
It most likely does this only while cruising under high loads? A clogged up exhaust manifold will not glow red hot. It is basically the same as starving your engine of air. You will produce less power therefore less heat. It would be like putting a lawn mower engine carb on a V8 engine.......no power ,......no heat. Even at "wot" you would not generate enough heat. You would have lots of fuel and no air for the mixture all that fuel would cool down the mixture and the combustion. If somehow you have late ignition timing that would cause this scenario.
In a 2002 Toyota Sienna i change the spark plugs after a 30 minute drive it stared shaking a it was night by that time we know it, that the manifold was red hot i disconnected the catalytic converter and still got red hot i don't k now what can it be; how do i check if is late ignition timing or if is something more.
i got a 1992 chevy truck 350 tbi ehaust glowing red changed o2 sensor and checked exhaust its not clogged up any idea
I have to agree with both points Clogged cat Plus an additional reason they got clogged, to much fuel aka Rich, if it's Immediate running rough it's not the O2's they don't turn on till operating temp and since headers and manifolds rarely ever clog loosen your pre cat bolts spread the pipe 1/4 inch or so and see if there is an improvement besides sounding like a drag car =Þ if yes then it's clogged if no move on to pertinent sensors with a digital volt meter you can test most The big ones are TPS, MAF, Primary Temp sending unit on top of the motor next to the fuel rail usually brass. those are the easy checks, rent a fuel pressure gauge at auto zone or such costs nothing since you get your money back when you return it, free is always good
Why would a 87 chevy 350 manfold glow
Christine, read me post above that I answered 2 years ago. That should answer your question. Kenny/MrBlueOval
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