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Old 07-07-2007, 02:33 PM   #1
xclover
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Member#: 109390
Join Date: Mar 2006
Location: Lake Placid, FL
Vehicle:
1998 Forester
Black

Unhappy Subaru Forester Misfire Problem

Hello,

I have a 1998 Subaru Forester with a 2.5L DOHC engine. When my problem first started I replaced the heads with 1996 heads with hydraulic lifters. I still have the problem. I put new plugs and wires in, new timing belt/tensioner, and new coil. Still throwing check engine light and it has been on for about 2 years now. When the engine idles it jumps around pretty good and last night on my way home the light started to blink a lot...it has blinked before but not that much. It was raining last night, but I have driven the car in the rain before and it did not seem to do that. Sometimes when the car is nice and warm it does not idle so badly. When I do start it on cooler mornings (I live in FL) it does have a good "Tick" to it. But some people have told me that is because the pistons do not have skirts?! Not sure about that. I have done a compression test and all looks good. Any help would really be appreciated!

Thank you,

Scott
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Last edited by xclover; 07-07-2007 at 02:35 PM. Reason: adding info about compression test
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Old 07-07-2007, 02:36 PM   #2
Acostafan
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Did you have the codes read? That would give you some insight. Autozone will pull the codes for free.
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Old 07-07-2007, 04:06 PM   #3
xclover
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Black

Default Codes

Ok, I did have them read before...that is how I know it is a cyl. 1 misfire. But I am going to have them pulled again and get the up-to-date code(s). When I get them I will post them, prob tomorrow 7/8/07. Thank you.
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Old 07-07-2007, 05:41 PM   #4
xclover
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Ok, I got the codes...there are two of them, and it is not cylinder 1...it is 3:

P0303
Cylinder 3 Misfire Detected

P0400
EGR Flow Malfunction

So that is where I am now. Please let me know what you think. Thank you!
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Old 07-07-2007, 06:04 PM   #5
silver2004impreza
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2004 Outback sedan H6

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What it could be is your EGR valve is sticking open. It's only supposed to be open when you're cruising at part throttle, if it opens at idle, the car will run rough and potentially die, if it's open far enough. There's a way to check the EGR with a hand-held vacuum pump, but I can't remember how to do that particular test. If you know any friends with a car like yours, only without the EGR code, you may want to try temporarily swapping your EGR valve with theirs and see if the problem clears up. If the replacement valve fixes your problem, then you know to replace the valve. It's only a couple of bolts and either a vacuum line, or maybe an electrical connector, depends on the year and type of car.
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Old 07-09-2007, 06:05 PM   #6
xclover
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Ok, I will check that out. I also was told that it could be my spark plugs...I did not know when I replaced them that I have to gap them...they are not pre-gapped. Is it true that this engine has a "Tick" to it because the pistons do not have skirts? I will gap the plugs and post if that worked or not. Thanks!
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Old 07-14-2007, 02:32 AM   #7
SubaruImpreza_power
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Quote:
Originally Posted by silver2004impreza View Post
What it could be is your EGR valve is sticking open. It's only supposed to be open when you're cruising at part throttle, if it opens at idle, the car will run rough and potentially die, if it's open far enough. There's a way to check the EGR with a hand-held vacuum pump, but I can't remember how to do that particular test. If you know any friends with a car like yours, only without the EGR code, you may want to try temporarily swapping your EGR valve with theirs and see if the problem clears up. If the replacement valve fixes your problem, then you know to replace the valve. It's only a couple of bolts and either a vacuum line, or maybe an electrical connector, depends on the year and type of car.

When I had my 98 Forester that happened to me.. It stuck open at starting the car up.. it was a bitch.... took 5 seconds of cranking then the car finally ran on it's own.
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Old 07-14-2007, 07:36 AM   #8
r8r4life
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Has it always been a misfire on #3?I don't know much about a 98 but I kept having a misfire on my 05 sti and it was the injector.
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Old 07-14-2007, 01:57 PM   #9
xclover
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I will check the injector too if it does not pan out with the plugs. I just hate pulling the plugs on this thing...pain in the rear!!
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