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Old 04-29-2013, 11:21 PM   #1
Speedwagon
Scooby Specialist
 
Member#: 19681
Join Date: Jun 2002
Chapter/Region: RMIC
Location: Denver, CO
Vehicle:
1998 Legacy Wagon GT
Green

Default Misfires and such

1998 Legacy GT, that came with the 2.5, but currently has a turbo 2.0 block(JDM 91 EJ20, no turbo, factory 2.5 NA manifold, wiring, etc). The problem stayed with the car, after I swapped the block, so I know it's not block related.

When the ambient temp is cool, the car is usually fine. But once it gets warm out, like it is now, I get misfires when the car is hot, after I turn it off and let it sit for a short period of time. I have also gotten flashing CELs, more so when it is warm/hot ambient temp. I recently got a job delivering pizza, which has made the problem that much more noticeable(a lot of on/off with the engine fully warmed up). So I have to get this fixed.

The coilpack tests within specs (~0.7 primaries, ~14k secondaries). Crank, cam, and knock sensors have been swapped out with junkyard ones, with no change in behavior. I have gotten codes for all 4 cylinder misfires, but no other codes present. The last one had freeze frame data of 177F temp, 87% load. It usually doesn't throw a code at idle when I fire it up, but it runs incredibly rough. I can often feel 1 or 2 cylinders not firing properly. If I rev the engine, they will start firing correctly, and then be fine the rest of the time the engine is running. I cleaned the IAC today, and put a new gasket on. Didn't change anything. I have also verified the timing belt position several times.

Last summer, during 90+ ambient temps, there was at least one time the car would NOT start after sitting about 30 minutes. It fired a few times, but wouldn't turn over. After I let it sit for another hour or so, it finally started up, but ran really rough at first. This was on the 2.5 block.
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Old 04-29-2013, 11:28 PM   #2
cal_look_zero
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Member#: 294461
Join Date: Sep 2011
Chapter/Region: NWIC
Location: Grass Pants, OR
Vehicle:
1997 Outback Sport
344hp/348tq

Default

Do you have 3 wires going into your coil pack, or 4? If it's 3, you have an external ignitor on the firewall directly behind the throttle body and may need to replace it. If 4, you may need to look into replacing your coil pack in spite of it ohming out okay.
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Old 04-29-2013, 11:46 PM   #3
Speedwagon
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Member#: 19681
Join Date: Jun 2002
Chapter/Region: RMIC
Location: Denver, CO
Vehicle:
1998 Legacy Wagon GT
Green

Default

3 wires. I'll check out the ignitor. Is there a way to test the ignitor?
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Old 04-30-2013, 07:01 PM   #4
yarrgh
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Member#: 80465
Join Date: Jan 2005
Chapter/Region: RMIC
Location: Aurora, CO
Vehicle:
2001 2.5RS
Black Diamond Pearl

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If you're getting codes on all 4 cylinders, look for something common to all 4. How's the timing? Any exhaust leaks? Is the front O2 sensor still good?
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Old 05-01-2013, 01:24 AM   #5
Speedwagon
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Member#: 19681
Join Date: Jun 2002
Chapter/Region: RMIC
Location: Denver, CO
Vehicle:
1998 Legacy Wagon GT
Green

Default

I swapped the ignition module out with a junkyard one today. I still got the rough startup once, but the temp has been dropping today(going to snow tonight). So my initial thought is that didn't fix it, but I can't say for certain yet.

I haven't checked the timing with a light, if that is what you are asking. And the O2 sensor wouldn't cause startup problems(or I don't see how, as the engine shouldn't care about the O2 at startup). But I don't know the exact condition of the O2 sensor, though there haven't been any codes for it at all.
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Old 05-01-2013, 05:14 PM   #6
Speedwagon
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Member#: 19681
Join Date: Jun 2002
Chapter/Region: RMIC
Location: Denver, CO
Vehicle:
1998 Legacy Wagon GT
Green

Default

I don't know if this is related or not, but my car has been doing this vacuum flutter under decel for a very long time. Is this normal? Or indicating a problem?



edit: A little more info now. It is snowing in Denver today, and I just noticed that the car doesn't do the vacuum flutter when it is cold. When the temp got up to ~50C, it started to do the fluttering.

Last edited by Speedwagon; 05-01-2013 at 07:04 PM.
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