Stuttering of the engine?

[Merlin]

My car has been misfiring which is more like stuttering. It happens only when I am accelerating (not in idle) and more often when I accelerate on a gear at low RPMs. My catalytic is completely shattered. Anyone recognize these symptoms? I am leaning towards a clogged up exhaust due to the bad cat but I want to hear more opinions because if it is the cat I cannot do anything for about 2 months.

An electric or fuel problem would cause misfire even at idle right? By the way the car has a new air filter.

Thanks

[Nachius]

Is it throwing a SES light and have you had it scanned?

If there is no light a clogged cat will cause that problem

[Merlin]

the SES light has not come on.

[Nicklz]

Just my guess, try running seafoam. My buddies s10 was doing that we ran seafoam thinking the engine was gunked up (210,000miles) and he says it runs like a new truck now.


Worse case senaro, seafoam doesn't work and you'll be out 5 or 6 bucks, but at least you'll have a clean engine.

I think it's weird the SES light doesn't come on though, if your getting misfires it should throw a code of some sort.

[stealth1281]

Originally posted by Merlin:
My car has been misfiring which is more like stuttering. It happens only when I am accelerating (not in idle) and more often when I accelerate on a gear at low RPMs. My catalytic is completely shattered. Anyone recognize these symptoms? I am leaning towards a clogged up exhaust due to the bad cat but I want to hear more opinions because if it is the cat I cannot do anything for about 2 months.

An electric or fuel problem would cause misfire even at idle right? By the way the car has a new air filter.

Thanks

sounds exactly like what my car is doing. no SES light either. My cat is fine and a mechanic said my plugs and wires were fine too. I just can't seem to figure out what the problem is. I switched from 87 to 89 octain gas and it seemed to help some.

[Merlin]

Originally posted by stealth1281:
</font><blockquote>quote:</font><hr />Originally posted by Merlin:
My car has been misfiring which is more like stuttering. It happens only when I am accelerating (not in idle) and more often when I accelerate on a gear at low RPMs. My catalytic is completely shattered. Anyone recognize these symptoms? I am leaning towards a clogged up exhaust due to the bad cat but I want to hear more opinions because if it is the cat I cannot do anything for about 2 months.

An electric or fuel problem would cause misfire even at idle right? By the way the car has a new air filter.

Thanks

sounds exactly like what my car is doing. no SES light either. My cat is fine and a mechanic said my plugs and wires were fine too. I just can't seem to figure out what the problem is. I switched from 87 to 89 octain gas and it seemed to help some. </font>[/QUOTE]Have you tried checking the fuel system? filter, etc? I am not sure if SES would come on or not but it is worth the try. Maybe the air filter too?

Mine is a really noticeable misfire like the engine completely chokes. In fact I cannot even burn my tires anymore. But it is not a persistent misfire, it happens only every now and then when accelerating. I am 99% sure it is the cat, but I wanted to hear other opinions. I think pieces of the cat may have fallen into the resonator that comes with the Flowmaster catback.