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Old 04-28-2004, 07:07 PM   #1
nhalterman
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'99 2.5 RS

Default Multiple Miss-Fires

Okay here is my situation. Please let me know what you think.

The car has 64,000 miles on it.

My car is idling bad, it has a horrilble hesitation anywhere under 3200 RPMs at 1/4 throttle, and the car backfires. If I punch the throttle, the car takes off. If I'm above 3200 RPMs I have do not have hesitation at any thottle position.

The car starts to run slightly better once it has warmed up.

I went to Autozone and I pulled the following codes.

Miss-fire in 1
Miss-fire in 2
Miss-fire in 3
Miss-fire in 4
02 error bank 1 P01301 (probably just the header)

Under a year ago I had my coil replaced.
I replaced my plugs and wires under a month ago.
I replaced my fuel filter under a month ago.
I have never replaced my 02 sensors.

The car has:

Cobb intake
Borla header
Stromug Mid-pipe
Scooby Sport Axle back
Perrin Pully
(various suspension & brake upgrades)

I went to a track day at Mid-Ohio last year and my coil went bad. I had it replaced. I went to Mid-Ohio again this year, and the problems started again, but this feels different from last year. I didn't have idle problems last time, and it felt more like hitting the Rev limiter at 3000 RPMs last time. This has a different feel.

I'm guessing it's the coil again, or possibly the O2 sensor.

Please give me your input. Thank you.
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Old 04-29-2004, 01:05 PM   #2
C-daleRidr
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How's your coolant?
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Old 04-29-2004, 04:34 PM   #3
nhalterman
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I replaced that before the track day as well. It's less than a month old. I checked the level as well. It's a nice Subaru coolant green too. So I'd don't think it's a head problem.

Thanks.
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Old 04-30-2004, 12:32 PM   #4
obyone
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May sound stupid but did you check your plug wires to see if they are properly seated?

I just had a CEL for misfire in cyl. 1,2, and 3, after getting my TWE cams installed by the dealer, and it turned out they didn't properly seat my plug wires onto the plugs. They were loose on 3 out of 4 cylinders.
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Old 04-30-2004, 05:45 PM   #5
nhalterman
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I have had that problem before. I didn't torque my plugs down enough so the wires didn't seat. I fixed that and reset my ECU. So this a different problem.

Thanks though.
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Old 04-30-2004, 06:33 PM   #6
obyone
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Quote:
Originally posted by nhalterman
I have had that problem before. I didn't torque my plugs down enough so the wires didn't seat. I fixed that and reset my ECU. So this a different problem.

Thanks though.

More stupidity, did you check the plugs to see if they still fire?
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Old 04-30-2004, 07:40 PM   #7
Honkey3k
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I would vote ecu
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Old 04-30-2004, 10:50 PM   #8
CheezeWeezle
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Quote:
Originally posted by Honkey3k
I would vote ecu
That's a possibility...a scary and $$ one too.....An O2 sensor wouldn't cause misfire codes on all cylinders though...not in my experience anyway...That and I wouldn't think you would be able to punch it with a bad O2 as well....maybe it's your coil again? Doing a quick once over of the RS service manual; It may be your injectors or a poor connection for the injectors..
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Old 05-01-2004, 10:42 PM   #9
obyone
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Quote:
Originally posted by obyone
More stupidity, did you check the plugs to see if they still fire?
Well...didja?

Pull the plugs and leave the wire connect to it. Then touch the thread part to a ground and start the car.

"IMPORTANT TO DISABLE THE OTHER WIRES SO THE CAR DOESN"T START ON YOU!"
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Old 05-03-2004, 01:54 PM   #10
nhalterman
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Default

Thanks. I didn't try this simply because this problem doesn't happen all the time. So the spark plugs must be firing most of the time. I don't think that this would tell me much.

If I had a constant miss-fire, then this would be a good test. Or am I wrong? Thanks anyway.



Quote:
Originally posted by obyone
Well...didja?

Pull the plugs and leave the wire connect to it. Then touch the thread part to a ground and start the car.

"IMPORTANT TO DISABLE THE OTHER WIRES SO THE CAR DOESN"T START ON YOU!"
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Old 05-03-2004, 01:56 PM   #11
nhalterman
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Cheeze,

Yea, I hope it's not the ECU.

What experience do you have with bad O2 sensors?

I'll run some injector cleaner through it, and check all of my injector wire connections and wires for burn marks.

Thanks.


Quote:
Originally posted by CheezeWeezle
That's a possibility...a scary and $$ one too.....An O2 sensor wouldn't cause misfire codes on all cylinders though...not in my experience anyway...That and I wouldn't think you would be able to punch it with a bad O2 as well....maybe it's your coil again? Doing a quick once over of the RS service manual; It may be your injectors or a poor connection for the injectors..
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Old 05-03-2004, 08:14 PM   #12
CheezeWeezle
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With other cars I have had when the o2 sensors went bad I couldn't accelerate at all, and actually it idled fine.......It would sputter and run like pure hell. Like I said, The service manual suggests either your coil, or injector problems..
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Old 05-03-2004, 11:28 PM   #13
obyone
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Quote:
Originally posted by nhalterman
Thanks. I didn't try this simply because this problem doesn't happen all the time. So the spark plugs must be firing most of the time. I don't think that this would tell me much.

If I had a constant miss-fire, then this would be a good test. Or am I wrong? Thanks anyway.
You never know, but it's always best to rule out the least expensive fixes caus you don't wnat to spend alot of coin to fix something that would've been a few bucks to replace.
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Old 05-04-2004, 09:32 AM   #14
Charlie-III
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What plugs did you put in?
What wires did you put on?
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Old 05-05-2004, 02:37 PM   #15
nhalterman
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Stock plugs & wires
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Old 05-05-2004, 04:25 PM   #16
Burnout
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Interesting, awhile back i had uneven idle and misfire on all cylinders and the same code you had. Car would hesitate terribly at low rpm's but once past 4grand it would do fine and everyone said it wasn't an o2 sensor........three aggregating months later I stop listening to every body and got a new o2 sensor and the problem was solved.

maybe its just me
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Old 05-05-2004, 07:39 PM   #17
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doesn't hurt to try...
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Old 05-05-2004, 09:32 PM   #18
maddbmxjumper
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ill put $$ on the rear 02 sensor, i had a cel, and i went to auto zone i it was same codes, missfire on all cylinders, and i took it to my subaru dealership and it was the rear o2 sensor, the 02 sensor is not covered under warranty so they replaced my cats so that it would be under warranty, ha ha, but ill bet its the 02 sensor, the rear one, kyle
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Old 05-05-2004, 10:56 PM   #19
Burnout
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The front is the one that crapped on me. The rear is to make sure the cats are operating correctly.
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Old 05-06-2004, 02:48 AM   #20
joefocker20
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I'd send the injectors to RC engineering to have them cleaned and flow tested. If not, buy new ones. I'd also ditch the OEM Crapion plugs and get some NGKs. Is there a way to check our coils with a multimeter? I had a fuel filter that was ruined by ****ty gas once, and it did the same thing, but that's an odd occurence.

BTW: the Rear 02 sensor does jack..
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Old 05-07-2004, 04:02 PM   #21
Burnout
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I would find someone local and see if they wouldn't mind switching out sensors for a little bit. Its not hard to do. I think there's a place online that sells the bosch o2 sensors for like 30 bucks. Another way to test it I think would be to unplug it and the car should go to a set map and see if the problem still occurs, if it goes away you know what it is then. Don't quote me on that but its worth a try and its free. Every one told me it was the wires, plugs, coil, water in my tank fuel filter the list went on. The o2 sensor is funny like that and a damn pain.
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Old 05-07-2004, 06:02 PM   #22
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Carefull with the O2 sensors. They are made of soft metal and will strip if you force them.
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Old 05-10-2004, 11:04 AM   #23
nhalterman
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Thanks for everyone's help.

I'm betting on the O2 sensor now.

I went to an auto-x on Sunday. The car was so rich that it stalled at idle. My gas mileage is way down right now too.

The only plus was that when I launched it spit black soot all over the front bumper of an Integra behind me. j/k I felt bad it was a nice Type R too.

I'll put an O2 sensor in this week and let you know how it goes.

Thanks again.

Nathan
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Old 05-10-2004, 12:29 PM   #24
1 Lucky Texan
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rich huh? could be Temp. Sensor.
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Old 05-10-2004, 02:49 PM   #25
obyone
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this anymore???

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Quote:
Originally posted by 1 Lucky Texan
rich huh? could be Temp. Sensor.
My car has a CEL for misfire too, but my O2 sensor is literally a week old.
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