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Old 07-05-2005, 10:59 PM   #1
keirnna
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Default Multiple Misfires, please help

I was driving my 4EAT 98 RS on a dirt road when I threw the following cels P0301, P0302, and P0303. They are cylinder misfires on 1, 2, & 3. The car also had a substantial loss of power. I limped it home, and it didn't overheat, or have any other problems other than a distinct loss of power, rough idle, and a change in engine tone. I removed all of the plug wires from the coil pack one at a time while the car was runing and the cylinder closest to the passenger (cly 1 I think) made no difference when I did this. All of the other cylinders had a change. I pulled the spark plug, it looked perfect. The car has NGK Iridium plugs with 10k on them and this is the first problem. I swaped the plug wires, no change. I just did a compression test and all cylinders checked out at 120 or more PSI. My next thought was to swap injectors, but after that I am at a loss. I really need some help on this one quickly. The car also had a new fuel filter put in ~10k ago. Please help me. Thanks in advance.
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Last edited by keirnna; 07-05-2005 at 11:05 PM.
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Old 07-05-2005, 11:27 PM   #2
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wow... that really sucks NATE!

I would have said to check your spark plugs/wires...etc. but according to your post you've already done that.

I would actually change the plugs to see if the plugs went bad. I would use cheap copper plugs though (NGK brand). Sorry I don't know the number for your car.

Good Luck...

Jon

- Had a similar problem with Rudy's car here he had the same CEL codes. ended up being that one of his coil pack wires wasn't on good. We though that they were the plugs at first (cheapest option) so we inspected them and when I went to inspect coil #3 the connection that goes to the coil pack just fell off by me just brushing against it. after putting it back on tight and hearing the click the car was all good!
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Old 07-06-2005, 12:01 AM   #3
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Yeah on the N/A subaru's you only have one coil pack. It connects 1-3 and 3-4 I think. Maybe the other way around, so if it was bad there would be trouble in another cylinder. The thing is there was no slow deterioration of performance, it was a suddent thing. I thought I could have pinched or damaged the headers or exhaust, but they look fine. I'm going to try to swap the plugs when I have a chance, but I really don't think any thing is wrong with these. I took them out and inspected them and they look perfect.
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Old 07-06-2005, 01:13 AM   #4
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The resistence is lower in copper plugs, and I've heard of the ECM being confused by platinums' before. I'd try a set of copper NGK V-powers and see if that helps...

Good luck
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Old 07-06-2005, 01:22 AM   #5
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I forgot to add this when we talked on the phone.

Take it to Autozone. I'd be real curious to see what the CEL is.
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Old 07-06-2005, 02:04 AM   #6
keirnna
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Pat, I have a CEL reader, I posted that they are all misfires and cylinders 1 - 3. I've ran these plugs for over 10k so a problem wouldn't just come out of the blue. The plugs are great. They helped the car a lot when I installed them.
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Old 07-06-2005, 01:17 PM   #7
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hang on, hang on, hang on. Before you start pulling anything else, let's think first. No, swapping your injectors won't do anything, most likely.

You got a misfire on three cylinders, acording to code. OK, it's a code. It's also a Subaru, so it could be that you're really misfiring, or it could be that you sucked up enough dirt to make a sensor unhappy, and say you're misfiring. Could you have sucked up some water? I have, on more than one occasion.

It sends me into "limp home" mode. You do know that's what you got, right? Limp home created by the ECU after it sensed a problem, as opposed to your car running like crap being the problem. Relax on it, happens to me every couple weeks. Usually, an ECU reset is enough to fix it.

Now, the one good thing is that you did find a cylinder that wasn't firing, as judged by the lack of change when it was disconnected. However, why isn't it firing? Next step is to jam a nail in the spark plug wire where the plug goes, and see if you can get it to arc to something metal while the engine is running. If you can get it to spark, that plug is bad. No spark, and we'll have to chase this further.

I'll be in and out today checking messages. Let us know what happens, or just call me and we'll think it through. It's a Subaru though, so it's going to be OK.
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Old 07-06-2005, 06:58 PM   #8
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Well I have an ODB-II scanner, and this problem has been going on for over a week. I sucked no water up. I was in a dry dusty area. The first thing I thought is that the air filter may have become so dirty the engine was not getting enough air. The filter was cleaned and re-installed and the problem persisted. I will find a nail and try that. I'll give you a call when I leave work in a few minutes.
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Old 07-15-2005, 10:36 PM   #9
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Well I just swapped the coil pack on top of the engine and still no response from cylinder 3. I need a fix for this ASAP. My STi just developed an electrical problem that is going to take a long while to fix.
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Old 07-16-2005, 03:39 PM   #10
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did you check for spart at the plug and at the wire seperatly? If you don't know that, there's no sense in going further. If you had/have spark, the coil change won't make a difference.

Keep in mind what it takes for a "bang". The basics. Spark, fuel, compression. Which is wrong? Don't assume one thing. CHECK!
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Old 07-18-2005, 11:14 AM   #11
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Right, so can you help me out? Spark is good, compression is good, and who knows about fuel. Should I try to swap the injectors?
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Old 07-18-2005, 03:14 PM   #12
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At this point it can't hurt.
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Old 07-18-2005, 03:17 PM   #13
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Yeah, I guess I'll try that, but I've already made an appointment to take it into the local Subaru dealer.
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Old 07-27-2005, 12:35 AM   #14
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Just to let everyone know what this was: I finally ran out of time to fix this. I took it to Subaru and it turns out that the timing belt with about 30k on it had slipped 3 teeth. $380 later the problem is fixed.
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Old 07-27-2005, 12:51 AM   #15
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Do you have it back? How's it run?
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Old 07-27-2005, 12:55 AM   #16
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I have it back, and it runs just fine.
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Old 07-27-2005, 12:56 AM   #17
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change plugs and plug wires.. if that wont fix it take a wire brush to the coil pack connections and brush off the corrosion. if all else fails go to subaru and get the pack changed. hope this helps.

edit: doh didnt read the post above.
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Old 07-27-2005, 12:58 AM   #18
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Yeah everyone thought it was the spark, but it was just the timing belt.
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Old 07-27-2005, 01:44 AM   #19
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"Just" a timing belt? he he he....only about 3 teeth away from a rebuild..... I'd say he got very lucky!

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Old 07-27-2005, 01:54 AM   #20
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Yeah well I was thinking the same thing when I said that. I wish it was a spark issue because that would have cost me a wopping total of $5 instead of $380.
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