Question about 2007 KTM 250 SX

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Engine stops when throttle is opened also exhaust glows red at manifold

Posted by Mervyn Wallace on


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Has major air leak (running seriously lean). If it is hard to start I would check carburation and crank seals.

Posted on Dec 14, 2012


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When you say that one injector is not working are you saying that it is not spraying fuel? If that is the case then the engine is releasing air into the exhaust manifold and that causes increased temperatures in the manifold. That is why the exhaust manifold is glowing red. There are other things that could cause this though and you should know that you have a big fire hazard present.

Feb 25, 2017 | Cars & Trucks

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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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Engine stops when throttle opened also exhaust glows red at manifold

I assume you're talking about 250SXF?
Check the carbie jets are not blocked, air filter clean, exhaust not blocked and valves are in specified clearance.
At night the manifold will glow red, this is normal.
You just can't see it during the day.

Dec 14, 2012 | 2007 KTM 250 SX

1 Answer

My serpentine belt broke drove car 30 miles home without belt, got a new belt put it on cranked car up took for test drive got back opened hood realised the exhaust manifold was red hot. Turned A/c off...

  • Well, that belt drives everything including the water pump. When the belt broke and you drove it no coolant circulated and the exhaust glowed from overheating. A red glowing manifold usually only happens from excessive heat caused from modified engines. But in this case this is almost surely what happened. You are lucky you did not blow your engine. Park it and let it cool down for a few hours.

Regards, Tony

May 25, 2011 | Mercury Sable Cars & Trucks

1 Answer

I have caterpillar disel genretor of 456kva capacity,when i switch on generator within halfhour of running it's EXHAUST MANIFOLD AND TURBINE GETS RED HOT. i am not able to understand why gets red...

It is quite normal for the exhaust manifold and turbo to get very hot, especially when the engine is working hard running at high speed under load. Every time the mixture in the cylinder is ignited there is a small explosion producing a BIG flame and a lot of heat to push the piston down. A lot of this heat goes out the exhaust. During daylight it is usually not noticeable, but at night it will visibly glow up to a bright red.

In relation to the oil pressure dropping, providing the oil level is at the correct level, there may be a restriction in the gauze filter on the input of the oil pump due to sludge buildup. Once the engine warms up and the oil thins out, the oil pump can't work at maximum capacity. The drop in RPM could be caused by the turbo getting insufficient lubrication and cooling due to the low oil pressure reducing oil flow to the turbo causing it to not work at its optimum speed and efficiency and therefore through reduced air flow into the cylinders the engine would tend to loose speed especially when under high load. The drop in RPM could also be caused by a problem with fuel flow to the injector pump causing the engine to run lean which would not allow the engine to produce maximum power and also contribute to higher exhaust temperatures because the governor would have the throttle wide open to try and maintain the engine speed when the generator is required to produce maximum output.

Oct 29, 2010 | Heating & Cooling

2 Answers

1997 F150 manifolds are glowing red

Sounds like cat convertors are clogged.

Jun 18, 2009 | 1997 Ford F150 Regular Cab

1 Answer

2001 ford Taurus v6 exhaust manifold glowing red

If you dont have the proper spark due to a bad coil pack you will not get all the gas burned properly and your manifold will glow red.I would start with the coil pack.!

May 14, 2009 | 2001 Ford Taurus

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