Question about Oldsmobile 88

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I have a 1989 olsmobile delta 88 3.8L front wheel drive.Engine runs very rough and about 5 minutes later catalytic converter turn red hot.

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  • tv2011 Apr 15, 2011

    Thanks for quick answer it was a vacuum hose broke,after fixed the engine still run rough.

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Sounds like a severe misfire to me. This is caused by a cylinder that is misfiring for one reason or another - most likely, several cylinders are misfiring due to a vacuum leak.

Posted on Apr 11, 2011

  • dttech
    dttech Apr 15, 2011

    If it ran bad enough to make the catalytic converter glow, It may have done permanent damage to the catalyst and/or the oxygen sensors. This mat be why it is still running rough. It would probably be a good idea to also check the spark plugs because they can also be damaged by a severe lean condition.

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SOURCE: I have a 1989 olsmobile delta 88 3 8L front wheel drive Engine runs very rough and about 5 minutes later catalytic converter turn red hot any answers

If the cat is red hot it can only be because it is getting too much air and fuel down there. You most likely have a very large vacuum leak.

Posted on Dec 20, 2011

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From a cold start motor runs normal up to about 5 minutes.then runs rough likes it only running on 3 cylinders and then dies and wont start. no engine light come on.


YOU HAVE A HONEST EXHAUST GUY, BUT YOU MIGHT WANT A MORE EXPERENCED MECHANIC. THAT CAN CHECK THE PROBLEM OUT CORRECTLY

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Volkswagen passat catalytic red hot problem, causes and solution


The catalytic converter will glow red hot when it is burning unburned fuel from the cylinders. One very probably cause is that one of the cylinders is not firing because it has a bad coil. If that is the case, the engine should be running very rough. To find out which coil... either get the engine code read, or unplug the wire from the coil and see if the engine does not run any rougher (put the plug back on quickly because that is more fuel not being burned. Replace that coil with new one from auto parts store (about $30).

IMPORTANT... do not try to figure out what coil is bad by unplugging the coil itself from the spark plug... if you touch the side of the cylinder head with the bottom of the coil, you will short it out and have to buy another one (I speak from experience).

RECOMMENDED - buy one extra coil and keep it in the car. Whenever your car starts to run very rough and have low power, pull over and replace the bad one. It takes 5 minutes tops, and only needs a dime to get the engine cover off. No other tools necessary (well... something to move the connector lock).

Another reason could be it's running rich. That is possible if the Mass Airflow Sensor is bad, or possibly the cam position sensor. These are easy to replace with a Google search showing how.

If your catalytic converter is glowing red hot, you have probably wrecked it. It _may_ be ok, but likely is fried and your engine light will be on and the code will indicate you have low efficiency on catalytic converter on bank X. If a 4 cylinder, then it will always be bank 1 because there is only one. If a V6, then it will be one of the two banks. But it will be the one that glowed red. Cats are expensive, and expensive to install, so if you see your cat glowing red, do not drive the car. Not to mention, Passats leak so much oil that it is a fire hazard.

Good luck!

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1 Answer

Catalytic converter gets red hot


No flashing check engine light? I would say that unburnt fuel is being burnt inside the converter, melting its interior down.
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I have a 1989 olsmobile delta 88 3 8L front wheel drive Engine runs very rough and about 5 minutes later catalytic converter turn red hot any answers


If the cat is red hot it can only be because it is getting too much air and fuel down there. You most likely have a very large vacuum leak.

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Check to see if the catalytic converter is clogged, a clogged converter will cause poor performance, the engine to overheat and the exhaust to glow red hot. That should FixYa. Find a different mechanic.

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clogged , check the rest of your exhaust after cat to see if it gets hot

you can buy a no contact thermometer for less than $55.00

but the shop that installed the cat should have that

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