Random cylinder misfire?????
02-16-2007, 08:19 PM
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Random cylinder misfire?????
Well the cobalt addiction DP was clogged,when my buddy put it on the reader it said "bad catattalitic converter and random cylinder misfire.I just swaped back on the stock Downpipe and have made an appointment with the dealer for wedsnesday. Can a clogged cat cause a random cylinder misfire due to a build up of backpressure due to carbon buildup?
02-16-2007, 09:01 PM
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now that I got the stock DP on now,Im gonna give it a good run on the highway to try to get some of the carbs out,cause damn i have no acceleration right now
02-17-2007, 01:59 PM
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The missfire will make lots of excess hydrocarbons which will plug the cat. Its not the cat causing the missfire, but the missfire killing the cat.
First you have to fix the problem of the missfire then get a new cat.
First you have to fix the problem of the missfire then get a new cat.
02-17-2007, 06:32 PM
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02-17-2007, 06:37 PM
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02-17-2007, 06:42 PM
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The dash hawk reads all the things that your throwing codes for. I was wondering what all the things where needed for an this just answered a few questions i had
02-17-2007, 06:49 PM
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my 07 has been to the dealer three times for a cylinder misfire in cylinders 1 and 4 and now finally they decided to fix it. gm told them that to test the injectors then clean them then test them again. so now they decided they are bad and going to put 4 new injectors in. my car has 2600 miles on it not even a month old and has been to the dealer 4 times and in the shop 13 days. they had to replace the stock clutch at 586 miles. i hope it gets better. lol
02-17-2007, 07:19 PM
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just swapped the plugs for autolites extremeperformance and the off idle seems to be gone,my second from the left stock plug had build up the other three were fine
02-17-2007, 07:47 PM
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Whoever said a clogged cat can't cause random cylinder misfire is wrong. It can and will if its clogged. Its like trying to blow through a clogged straw, a little air gets through "Random" spots but its still clogged.
Random Cylinder Misfire can also be caused by:
Bad Timing
Fouled Plugs
Clogged Injectors
Faulty Wiring
and in older cars bad ignition cassettes when the plugs shared a cassette.
Random Cylinder Misfire can also be caused by:
Bad Timing
Fouled Plugs
Clogged Injectors
Faulty Wiring
and in older cars bad ignition cassettes when the plugs shared a cassette.
02-17-2007, 08:22 PM
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Whoever said a clogged cat can't cause random cylinder misfire is wrong. It can and will if its clogged. Its like trying to blow through a clogged straw, a little air gets through "Random" spots but its still clogged.
Random Cylinder Misfire can also be caused by:
Bad Timing
Fouled Plugs
Clogged Injectors
Faulty Wiring
and in older cars bad ignition cassettes when the plugs shared a cassette.
Random Cylinder Misfire can also be caused by:
Bad Timing
Fouled Plugs
Clogged Injectors
Faulty Wiring
and in older cars bad ignition cassettes when the plugs shared a cassette.
02-17-2007, 08:59 PM
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Whoever said a clogged cat can't cause random cylinder misfire is wrong. It can and will if its clogged. Its like trying to blow through a clogged straw, a little air gets through "Random" spots but its still clogged.
Random Cylinder Misfire can also be caused by:
Bad Timing
Fouled Plugs
Clogged Injectors
Faulty Wiring
and in older cars bad ignition cassettes when the plugs shared a cassette.
Random Cylinder Misfire can also be caused by:
Bad Timing
Fouled Plugs
Clogged Injectors
Faulty Wiring
and in older cars bad ignition cassettes when the plugs shared a cassette.
The Missfire clogged his cat and now he has to fix the missfire. Hopefully it was the plugs, but more than likely its the timing from those shiny new cams he has... I'm sure they crank the timing way up and hes getting a little pre-ignition now and again. I would be less into the dealer and more into the guy who did that cams.
02-18-2007, 08:01 AM
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Catalytic Convertors don't clog on there own for no reason... Cats dont die, they are murdered...
The Missfire clogged his cat and now he has to fix the missfire. Hopefully it was the plugs, but more than likely its the timing from those shiny new cams he has... I'm sure they crank the timing way up and hes getting a little pre-ignition now and again. I would be less into the dealer and more into the guy who did that cams.
The Missfire clogged his cat and now he has to fix the missfire. Hopefully it was the plugs, but more than likely its the timing from those shiny new cams he has... I'm sure they crank the timing way up and hes getting a little pre-ignition now and again. I would be less into the dealer and more into the guy who did that cams.
02-18-2007, 01:30 PM
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I keep telling you once you start modifying having one is essential. 
02-18-2007, 03:03 PM
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