My car has about 13k miles and the CEL has been coming on frequently for the same reason, multiple cyl misfires. The CEL comes on and then off within a couple of days. I took it to the dealer and they told me that the car doesn't have a catalytic converter and that may affect it. I know this isn't the case since there are alot of people out there with a test pipe and no misfire conditions. They also pointed out the tie-wrap on the map sensor, are you serious?? I know dealers tend to be stupid but how bad can this get. Just wanted to see if the test pipe and aftermarket exhaust could contribute. What else could cause this since this car only has 13k miles on it. They said they swapped the coils and well lets see.

 

Put the cat back on and see if it continues.

 

What kind of test pipe do you have?
How do you fool the O2 sensor?

 

Although a possibility, I doubt the test pipe will be the primary cause of the misfire codes. Quite a few people with totally stock exhausts get multiple misfire codes. These things happen and it's doesn't necessarily have anything to do with the exhaust system.
As for the zip tie on the MAP sensor, he's not kidding. This is actually a Honda TSB. A loose MAP sensor harness has been responsible for a whole variety of woes on this car. Have a look:
https://www.s2ki.com/forums/index.php?showtopic=253242

 

Don't all s2k's have the tie-wrap around the map sensor? I was surprised to see that they didn't know about the tie-wrap. I have a Berk's tech test pipe with the built in mech 02 sensor. Before that i had a megan and i made the mech 02 fix myself and never got a CEL due to cat malfunction. I've tried some fuel injector cleaner and several different gas stations to see if it's a bad quality gas problem but keeps coming back. Now they took a look at it and swapped coils or something like that but prob won't do anything else if it comes back on since they're blaming the cat. I don't have a stock cat but i guess i have to buy one.

Thank you for the replies.

 

I need some help, car got out of the dealer, no more CEL obviously they didn't fix crap just erased the code. The service guytoldme they swapped the coils around or some crap, man this is upsetting. Now it's even worse i can actually hear the damn misfire fromthe exhaust, and it seems to only happen at idle. The car when idling starts to puff, throw like little bombs/mini explosions type of sound . What to do

 

That is the first step in resolving multiple misfire codes. I imagine next will be injector cleaning, new coilpacks, check fuel pressure and ultimately, a new ECU. These things take time. It took Rick Hesel between 6 months to a year to resolve his issue. He ended up getting a new ECU that cured it all.
You might want to put the cat back on. Having a test pipe may deny you a warranty fix even though it's not the likely cause of your problems.

 

I'll try different dealers and see if any othem would want to deal with the case without blaming the cat. What exactly do they mean by swapping coils, is it like switching them around? I need to invert their process since the problem is more detecable now. Thanks

 

I doubt you'll find one. You've removed a key component of your emissions control. Your sparkplugs, coilpacks, injectors and ECU are all part of that same system. It would be easy for any dealer to say you've voided your warranty.

 

One thing that i always wondered, don't dealers get paid by the manufacturer to fix things on vehicles under warranties if so then wouldn't dealers be benefiting from working on these or any other cars since all they're doing is replacing/fixing stuff and getting paid.?? Just curious maybe i'm wrong and cars under warranty aren't so much profit for them.