could a convertor make a car misfire?

Question

I have changed the intake gasket, replaced the O rings on the injectors, and replaced spark plug wires with real good ones. I still have a misfire and the convor turns cherry red.

Answer 1

When you replaced the wires did you put the right wire on the right spark plug, if you mixed them up it may cause miss fire. If you have plugged convertor the car might miss fire, lurch, stall out.

Answer 2

The convertor could be turning red hot from overly advanced timing, which will cause your car to run hot, and could cause mis-firing.

Also, overly advanced-timing can cause so much heat in your exhaust gas to effectively melt the catalyst in the convertor, causing additional backflow problems.

You indicated you changed plug wires, but did you actually check the plugs themselves? Is the mis-fire in one cylinder only, or in al of them? You could have a defective coil-pack, which would also cause the cat to overheat from sending too much unburned fuel through the exhaust.

In short, misfires can be caused by a lot of conditions. The cat becoming hot is probably the result of the misfire, though - not the other way around.

Answer 3

Yes, but normally a clogged converter will cause it to die. Timing? Bad gas?

Answer 4

Blocked converter is what it sounds like. I'll bet you don't drive that car very far, even if you drive it a lot.

Answer 5

Yes if it is bad it can make it back fire and can blow your exhaust manifold gaskets in your case your converter is bad.

Answer 6

a converter that is clogged or restricted could cause back pressure that may cause preignition, give it a shot.

Answer 7

is your converter plugged up?