Question about 1987 Buick Regal

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Exaust getting too hot wont pass emissions

Cat converter gets cherry hot when running

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You have a Bad Catalytic Converter. Get this Replaced and you should Pass Ok. Please Rate My Response! Thanks!

Posted on Jan 31, 2009

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This is usually caused by it being plugged. The longer the exhaust is in the unit the hotter it becomes. They are very hot when new but over time they become restricted with deposits and the increase in heat is great. Usually it will also hinder the cars performance.

Posted on Jan 31, 2009

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Replace timing belts crank sensor runs rough at idle an exaust gets cherry red


This could be several things. One is obstructed CAT. The most common cause though is the engine is running so rich it is dumping unburned fuel into the exhaust. This could be a bad injector sticking exhaust valve, constant misfire etc. Don't run it like this or you will end up with a pile of charcoal and steel where your car is supposed to be.

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My car just cut off,when try to restart it spits back thru breather ,runs a little but willnot accelerate,also when it does finally start,cataylic converter gets cherry red


the cherry red catalytic converter is the sign of a complete blocked cat and needs immediately replacement. The starting problems you have are due to this situation. Change the cat and you will see improvement.

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Failed smog test


Most modern vehicles have 2 catalytic converters, there may be one located at the exhaust manifold, or be what's called a resonator. The resonator will look almost like a cherry bomb muffler, this is a crucial part of exhaust emissions.

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Well i did not pass emissions a code 0420 came up when i go to push on the gas i takes a while to go so there is loss of power in my car


The PCM copares switch rates between the front O2 sensors and the downstream catalyst moniters. The catylist moniters are often mistaken as O2 sensors, and they are, but that is not their job, or what they are called. By comparing the switch rates between the front (before cat) and rear (downstream of cat) the PCM knows if the cat is affecting the exaust, and how much it is affecting the exaust. If it sees little or no effect o the exaust gases that have passed through the cat, then it decides that the cat is not working anymore, ad sets a P0420, or a P0430, depending on which bank it is. To check this yourself, you will need to bring up data stream on your scanner, watch the upstream and downstream O2 parameters and see if they are following each other closely. If the cat is working right, you should see a fairly rapid switch rate, probably 5 or 6 times a minute on the front O2, but almost a flat line just above .5 volts on the rear. If the rear is switching often you proabably need a catalytic converter.

Hope this helps, James Booth!! PLEASE RATE THIS!!!:)

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I have a a check engine light on. Honda tech diagnosed it as a plugged catalytic converter. Estimated parts costs alone are $1300 including converter, exhaust manifold, 2 O2 sensors. Car runs fine at...


If it accelerates good, going up a hill, and you don't feel it holding back, or sluggish when trying to accelerate, I'd certainly get a second opinion. What code were/are you getting?

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It could be the o2 sensor, Try going for a bit of a drive and then getting the emissions test done. When the engine is hot, the test reads better.

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