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Old 10-10-2017, 08:50 PM   #1
Chump Car Subie
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Default First time with a subie and shes a bit cranky

Hi everyone, new to this forum and Subarus in general and thought I could pick up some good advice in here about a build I'm working on with a 2000 Subaru Impreza with a 2.2 and 5 speed. Trying to get my 3 posts in so that I can post in the NA forum with some issues that I am having and tried to resolve with no avail, looking forward to learning the subie world!
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Old 10-10-2017, 08:59 PM   #2
Mashedanalpotato
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Well you can ask here. Also should have bought a he not a she, less leaky!
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Old 10-10-2017, 09:59 PM   #3
Chump Car Subie
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Haha I like that! anyway its a project build that was inherited and is having some high rpm issues, especially after it gets warmed up. So basically it had a terrible break up or what feels to be like a misfire anywhere between 3500 to redline when under a load, under no load it does not exist. Compression check was done and all cylinders were between 175-180 psi, new front O2 sensor was installed due to a p1133 code which has not came back. The coil pack was swapped with a spare and this seemed to make a difference until the coolant temp was up to operating temperature and then the break up started to show up again but not as bad. Next the fuel injectors were swapped along with the pressure regulator for some from another intake that was lying around. This really seemed to help, she sang all the way to the limiter for 5-6 first gear pulls which previously was not possible, but to no avail after a while the random jerk or misfire came back after it had been running for a while. I hate to sink a bunch of money into sensors and things not knowing for sure if they'll cure the problem or not.
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Old 10-11-2017, 12:41 AM   #4
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Check all your grounds and battery terminal connections while you are at it. If you have loose connections the higher vibrations under load can vibrate the connections and it will feel like a misfire or fuel cut.
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Old 10-11-2017, 01:04 AM   #5
Pro60modman
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Check the fuel pressure. Judging by what you are saying it is likely a fuel pump or fuel filter. The misfire is likely a result of running very lean to the point of causing multiple misfires. If the spark plugs aren't too new pull them and check the color of the electrode. If it's white your running lean.
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Old 10-11-2017, 04:44 AM   #6
hijinks
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Quote:
Originally Posted by Mashedanalpotato View Post
Well you can ask here. Also should have bought a he not a she, less leaky!
Careful your sponsors might pull out after statements like that
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Old 10-11-2017, 08:04 AM   #7
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I haven't seen it mentioned... spark plugs?
My old tuned WRX would have random misfires at the upper rpms on long wot pulls when it was time to change the plugs.
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Old 10-11-2017, 09:59 AM   #8
Chump Car Subie
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Hmmm I never considered the ground connection, I'll definitley check that next since its free to do haha. Pro60modman, the fuel pressure is reading 40 psi right out of the filter which is where the sending unit for the gauge is so the pump isn't a concern, the filter could still be clogged I suppose though. littledrummerboy,The spark plugs aren't terribly old and they have a whiteish grey look so I suspected it was a bit lean. The spark wires also ohm checked good as well and don't appear to be in bad shape
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Old 10-11-2017, 10:37 AM   #9
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Quote:
Originally Posted by Chump Car Subie View Post
littledrummerboy,The spark plugs aren't terribly old and they have a whiteish grey look so I suspected it was a bit lean. The spark wires also ohm checked good as well and don't appear to be in bad shape
Yeah imo, it’s not about the age of the plugs, but how much work the motor is doing and the distance it’s been doing it.

Mine ended up on a 2 yr plug replacement schedule... not terribly old either, but with the tune, autocross, and dd, it needed it. It seems to be worth a shot at least considering the things you’ve checked.

Last edited by littledrummerboy; 10-11-2017 at 10:42 AM.
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Old 10-11-2017, 12:40 PM   #10
Chump Car Subie
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littledrummerboy, yea I think thats what I'm gonna try next, the car ran a 12hr endurance race last spring and didn't start having this problem until the end and it has gotten progressively worse, I'll update when I try!
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Old 10-11-2017, 01:17 PM   #11
lpxltt
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Make sure the plugs are correctly gapped. I had a misfire on my 2.2 AFTER I replaced the plugs with "pre gapped" units.

IIRC the stock gap is .039-.043 as acceptable. I was in a rush and didn't check them. The one that was misfiring was .053.
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Old 10-13-2017, 07:54 AM   #12
Mashedanalpotato
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You have any luck on this? Lots of good advice it looks like you got.
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