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Old 08-19-2006, 09:38 PM   #1
Master2192
RIP 10/12/83 to 02/10/08
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04 WRX

Default Yay for Misfire codes

Well, last month about 2 days before I installed my new flywheel/clutch, I got a cylinder 4 misfire code while climbing a hill at high rpms and light throttle.

Today on the drive home from my Parent's house on I-5, I got Cylinder 1 & 2 misfire codes. These were about 1000 rpms less with even less throttle. I do know I get misfires every now and then, when slowly accelerating from a light, but usually never above 2500 rpms (and they don't throw codes).

Spark plugs are about 2000 miles old, plug wires are less than 10k. Should I think about replacing my coil? Try changing spark plugs again?(didn't help last time) I don't know if the coil has ever been replaced, car has 163,200 miles. 98 RS

Some info on the Misfires:

Cylinder 4 Misfire
-Intake Manifold Pressure (absolute) 7 psi
-Coolant 183.2 degrees
-Calculated Load 27.8%
-Engine Speed 4,125 rpm
-STFT 0.00%
-LTFT 18.75%
-Fuel System Status = Open Loop

Cylinder 1 & 2 Misfires
-Intake Manifold Pressure (absolute) 5 psi
-Coolant 183.2 degrees
-Calculated Load 16.1%
-Engine Speed 3,275 rpm
-STFT -1.56%
-LTFT 6.25%
-Fuel System Status = Closed Loop
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Old 08-19-2006, 10:46 PM   #2
Phot3k
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Crystal Gray Metallic

Default

My car seems to do that too. I hear some pinging when I'm driving under load with light throttle (9 times out of 10 up a steep hill without stepping all the way down on the gas). Goes away when I really step on the gas and burry the throttle.

Just out of curiousity though what kind of datalogging software were you using? I'm about to pickup an ODB2 cable myself to try and diagnose this myself.
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Old 08-20-2006, 12:55 AM   #3
Master2192
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Default

Quote:
Originally Posted by Phot3k
Just out of curiousity though what kind of datalogging software were you using? I'm about to pickup an ODB2 cable myself to try and diagnose this myself.
Actually, thats my CarChip. It records up to 5 parameters, once every 5 seconds. The information I just gave was actually the information stored for the trouble code. A standard code reader won't give you all the information that the ECU has, but a OBD-II cable with some software, or this carchip should be able to. What I like about the carchip though is I can leave it plugged in, its so small that it sits in the OBD-II port and you can't tell. Later I can disconnect it and download the information on the computer.

It has shown me that at 60 mph, and 7 psi absolute manifold pressure, for an extended period of time, will trip off the Catalyst Efficency code. I have gotten that code like 6 times and the information always comes back the same. Same speed, rpm, manifold pressure. Only thing that changes is the fuel trims.
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Old 08-20-2006, 01:21 AM   #4
Kostamojen
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Check for seepage in your spark plug holes, and look for any leaks around the headgasket area...
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Old 08-20-2006, 01:43 AM   #5
dexterous
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I had an issue just like that years ago on my 97 L. I found out that my timing belt jumped a tooth.
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Old 08-20-2006, 11:10 AM   #6
Seeinstars
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2004 jbp forester xt

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The missfires are because of the lighter flywheel. (I'm guessing you put a lightened on in)
The IAC cannot compinsate for the quicker throttle response, and causes it to throw out missfire codes.
This happens on some rs's 99-02, all 02 wrx's, some earlier 03 wrx's.
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Old 08-20-2006, 03:30 PM   #7
Kostamojen
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Quote:
Originally Posted by Seeinstars
The missfires are because of the lighter flywheel. (I'm guessing you put a lightened on in)
The IAC cannot compinsate for the quicker throttle response, and causes it to throw out missfire codes.
This happens on some rs's 99-02, all 02 wrx's, some earlier 03 wrx's.
I havent seen him say lightweight flywheel...
But if it is a lightweight flywheel, then yes thats probably the problem. Mine causes a CEL every now and then. Reseting the ECU fixes it for a long while, but it usually happens at lower RPMS in stop and go traffic (this car hates going under 2000rpms, so I tend not to drive under 2000rpms)
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Old 08-20-2006, 07:51 PM   #8
Master2192
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Well, the first misfire code was before the flywheel. Yes I did install a lightened flywheel, ACT Pro Lite 13.5lbs. I don't see how the IAC could cause problems because they've all been at such high rpms with light throttle so the IAC should be closed. I've always had misfires at low rpms and low to mid throttle, but they never threw codes before.

In other news, I checked my fluids today and there was no oil on the dipstick I put in the 3/4 of a quart I keep in the car and it still didn't touch. So I decided to change the oil instead of just pouring more in. There was still alot to drain out so it must have been just under the level of the dipstick, but I am tired of burning through all this Mobil 1 so I switched to Syntec. We'll see how that goes.

I also changed my air filter, it had been with the car when I bought it so I didn't know how old it was (that and it never looked that dirty). The date code on the old filter was 07/01 It'll probably run better now. Then I also found a slight vacuum leak at where the vacuum hose comes of the manifold for the egr stuff and my vacuum gauge. So I took a zip tie and fixed that, gauge reads 20 inHG at idle instead of 18 and reacts much faster as well.

I'll hold out for alittle while longer and see if the codes pop up. I checked the cam timing and it is dead on. So maybe it was a combination of all the other things I found, or just the flywheel.
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Old 08-20-2006, 09:51 PM   #9
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Did you double check for oil seepage anywhere? Oil disapearing like that is not good...
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Old 08-21-2006, 05:53 PM   #10
Seeinstars
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2004 jbp forester xt

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Quote:
Originally Posted by Kostamojen
Did you double check for oil seepage anywhere? Oil disapearing like that is not good...
Mine used to loose a lot of oil. I had to add a quart everytime I filled the gas tank. So about once a week.
The cause of this problem was because the original owner switched to mobil 1 at 45,000 miles. (worst thing you can do!!) After that it started getting worse, he sold it to me, I drove it for a while like this. I rebuilt the engine at about 70,000. (new pistons, new rings, and rod and crank bearings.)
If your going to use synthetic Please do it from the very start of your car being new.
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Old 08-21-2006, 06:57 PM   #11
Kostamojen
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None of the subarus my family owns loose any oil at obsene rates, even the 04 FXT and the '78 wagon (which I redid most of the engine seals/headgaskets myself), so personally I dont think any scoob should do that ever...

I'm trying to figure out how the technician diagnosis goes after the misfire code gets pulled, but I dont have the specifics step-by-step for it...
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Old 08-21-2006, 08:10 PM   #12
Master2192
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Default

Nope, didn't notice any oil seepage. Everything was bone dry under there, I checked for that first but I am pretty sure I am burning it off. We'll see what happens with the castrol, but it could just be the mileage since the engine has 163k on it.

I usually don't burn it that quick, and I check it pretty regularly. But I also drive very hard as well. Car feels much stronger now though, I think that air filter was far more clogged than it looked.
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