misfire question

**baseballss** · 01-28-2006, 06:30 PM

can a bad catalytic converter cause a misfire??? i just had my damn engine swapped and all the plugs wires coil packs changed and i have a misfire on cylinder #! unreal. anyways..... i looked under my car tonight first time i have driven it in a week and when i looked under it the catalytic converter on the drivers and and part of the y pipe was glowing broight red, hot as fire!!!!! what the hell. anybody got anything??

**baseballss** · 01-28-2006, 07:30 PM

????????????????????

**baseballss** · 01-28-2006, 08:28 PM

anything????

**Blitzed** · 01-29-2006, 04:22 AM

Sounds like your too lean, Throwing any codes? since you said its a misfire on Cyl 1 then I assume you have a data logger. Check your fuel trims and O2's for erratic behavior. I data log all the time so when somthing is a little off I spot it quickly, good luck

**baseballss** · 01-29-2006, 06:03 AM

how do i check that?

**baseballss** · 01-29-2006, 06:04 AM

i went to autozone and the only code was p0301 which is misfire cylinder #1. seems like if i had a sensor out it would come up wouldnt it?

**02z28ls1** · 01-29-2006, 11:47 AM

The convertor is red hot from being overloaded with fuel-it will affect the entire engine not just one cylinder if it were clogged.In other words the cylinder 1 misfire is causing the convertor to be loaded with fuel creating the red hot glow.It may be damaged from this but it's not what is causing the problem.Check the plug in cylinder #1-is this a new engine?It may be a problem w/new motor.Or defective coil pack.Swapping this stuff to the cylinder next to it would be one method of diagnosing this.The misfire would move if it was the part you just moved(plug,coil pack,etc.)

**keliente** · 01-29-2006, 12:11 PM

Spark plug, spark plug wire, coil pack, fuel injector. Try swapping those parts with other cylinders and see if the misfire moves to that cylinder.

Do a compression test to verify the cylinder is healthy. Do a leakdown test to verify that you don't have a bad intake or exhaust valve.

**baseballss** · 01-29-2006, 04:53 PM

i have just had a new block and heads put in!!! new plugs and wires.

**baseballss** · 01-29-2006, 04:54 PM

im thinking the converter is damaged because i drove it way too long before when i had a damn whole in one of my pistons (Cylinder #5) and of course still having problems.

**baseballss** · 01-30-2006, 05:13 AM

???????????????

**toneloc60** · 01-30-2006, 06:24 AM

Your converter isn't going to cause a misfire on only one cylinder, as stated before. You have to check what's going on with that one cylinder. Check for spark, check for fuel.

For now, don't worry about the symptom (the converter), find the problem.