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Old 01-20-2004, 11:13 AM   #1
C-daleRidr
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Default New plugs, wires, coil alright and still idles really rough...

My car's still not running right. I've been getting flashing CEL's under or just over 1k rpm and really rough idle. I replaced the plugs and wires and the coil checks out fine as far as resistence goes. I finally bought an OBD-II scanner and am now waiting for it to start throwing codes again. The interesting thing is that the car evens out and any CEL's go away or steady up after about 2k rpm.

I spoke with a service manager over the weekend (we live too damn far away from a SUbie shop, so I'm doing a lot over the phone and on here) and he suggested that it might be an air flow sensor and kept talking like my car had a MAF sensor instead of MAP. In looking under the hood, though, it sure looks like there's a MAP sensor on top of the manifold right next to the coil pack. Would that be something to check out as well? The service manager seemed to think that it was probably air flow related, especially since everything evens out at higher revs.

I have the scanner in the car so that the next time it throws a CEL I can pull the codes and find out what's up. It seems like, every time I disconnect the battery, the car waits a few days to throw a code again, which also seems pretty strange. I'll get codes up if they get thrown again, but I'm treating it like a rough idle problem at this point, and any help or suggestions would be great.
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Old 01-20-2004, 01:08 PM   #2
C-daleRidr
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Update: The only code that it's throwing is P0302, misfire on cyl. 2.
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Old 01-20-2004, 02:50 PM   #3
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Could be the front O2 sensor; it'll screw everything else up and give you misfires at idle/low RPMs. When mine went bad I was having misfires on all four cylinders.

A set of rhino ramps, a 22MM wrench, and a $65 sensor may be your solution.
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Old 01-20-2004, 04:19 PM   #4
JenisonWRX
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stock plugs and wires?

irdiums made my rs run like as ass ...
magnecore wires make my rs run like ass ...

stock = good
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Old 01-20-2004, 04:40 PM   #5
C-daleRidr
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stock all the way around. The good news is that I have an extended warranty that my dumb ass completely forgot about. I'm going to have it towed to the nearest dealer (2.5 hours away) and go from there. Less than 200 miles before I get to 80k and the end of the warranty, so for once it was pretty good timing.
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Old 01-20-2004, 08:30 PM   #6
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You're lucky. Have the CAT checked, too. They're warrantied up to 80K naturally (mine went bad and was replaced at 75).
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Old 01-20-2004, 08:37 PM   #7
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Ok.

Misfire related things

Since you have pretty much rulled out the ignition system as the cause.

I would have the compression checked on cyl 2 and have a leakdown test perforumed to rule out a bad valve, or a worn piston ring.

Next if that passes I would be looking at that fuel injector.

you wont get a misfire code for an individual cylinder from a bad cat or a bad o2 sensor.

Jay
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Old 01-21-2004, 11:03 AM   #8
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Quote:
Originally posted by McDade
Ok.

Misfire related things

Since you have pretty much rulled out the ignition system as the cause.

I would have the compression checked on cyl 2 and have a leakdown test perforumed to rule out a bad valve, or a worn piston ring.

Next if that passes I would be looking at that fuel injector.

you wont get a misfire code for an individual cylinder from a bad cat or a bad o2 sensor.

Jay

Since it's under warranty, I'm going to see if the dealer will do a compression test on all four cylinders, and maybe leakdown tests all the way around too, if they'll work with me to see if that stuff could be covered. I also thought about using some injector cleaner to see if that helped it. I would think, though, that it would be a problem throughout the rev range if it was a fuel delivery issue. This all happens just at idle. We'll see pretty soon. Thanks for your suggestions, Jay. I'll at least make sure that the dealer does as much to properly diagnose the problem as possible.
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Old 01-21-2004, 12:27 PM   #9
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Yeah it doesn't sound like a fuel issue, its possible though. Your injectors could be clogged.

Have you changed your fuel filter recently or at all? I just swapped a new one in my 98 at 65k and it made a noticeable difference through my entire rpm range. Most noticeable in the upper rpms, but it did affect from 2k-3k as well, my car pulls harder, is more consistant and doesnt' really misfire at all down low now.
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Old 01-21-2004, 12:41 PM   #10
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investigate the IAC. sometimes can be cleaned.
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Old 01-21-2004, 04:43 PM   #11
C-daleRidr
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Thanks for the suggestions, all. It's on its way to the dealer and should be there soon. I picked up some Techron fuel system cleaner to start using every time I change the oil, just in case. I think I might clean out the throttle body, or at least take a look at it, when she gets back to me as well. The fuel filter was changed about 20k miles ago, but I did consider that as well. We'll see, I suppose.

I've also had cat problems with the car in the past; it's thrown the P0420 without any mods at all. Gonna have them check the cats, too.
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Old 01-24-2004, 12:31 PM   #12
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Well What Happened?? I have a Misfire on Cly 3... I dunno If it's due with the Bosh Plat plugs I put in at 77K miles I'm at 80K now... Still the same O2 plug but it does this rough idle when cold.
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Old 06-27-2004, 07:30 PM   #13
erice1984
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I also have rough idle, I went through these steps and still havent solved it,

I only have 57,000 miles on my 00 rs

Codes say misfire on all cyclinders

+ changed fuel filter
+ cleaned idle sensor
+ cleaned throttle body

Thing I have not checked is the o2 sensor.

-Eric
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