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Old 08-19-2006, 10:24 AM   #1
Scooby Newbie
Member#: 123476
Join Date: Aug 2006
Default 01 OBW lean misfire cyl 2 mechanic can't locate cause!

Okay, on the way back from GA my car started getting sluggish and threw a CEL. Car ran "okay" once we were home and took the several hundred pounds of tools out. A few days later I get the FLASHING CEL. I take the car to a buddy of mine that has worked at the subaru dealership, the Mercedes/Porsche dealership, the Jaguar dealership,VW, etc and now has his own shop, a real import guy. He pulls the codes and gets Misfire CYL 2, knock sensor, and some other code ( which he disregarded, saying the misfire was causing that one to come up). He hooks the car up to the Sun machine, tells me the impedance in the wires is all wrong and to go get some new plugs and wires (I didn't bother to tell him I had replaced the plugs 2 days before to no avail), and that should fix it. Well, it didn't and the car is getting steadily worse. A few more tests (one with a bottle of MAPP gas) and he tells me it is a lean misfire....don't worry about the knock sensor as if it were that or an 02 sensor, it would randomly misfire, not just the #2 Cyl. I see his point and concur. Tells me to grab a bottle of 44K, throw in the tank and see what that does. It did nothing and the car is only getting worse, to the point of backfiring now (not to mention the grief and embarrassment of driving out an entire tank of fuel waiting for the "hope in a bottle" to work). Now it has gotten so bad, that I do not want to move the car again until I try at least something else to improve it for fear of hurting the Cat. Conv. I should also note that the car does seem to get worse as it's operating temp heats up.

He says the coil pack checks out, the plug wires check out, etc... and NOW THE GUY WON'T RETURN MY CALLS, AND I OWE HIM MONEY!! I believe he has ran out of ideas as to what the problem is and is a little skiddish about recommending more work that won't help..can ANYONE help? The car's head gasket did/does have a minor leak ( I need to add water to the OF tank after about 1500 miles, 16-32 oz or so) which I have made manageable with ThermaGasket (and it was in cyl 2), could this be the cause? There are no external leaks, no steam, and the car indeed fires right up ( it's not a struggle to get ignition), and I believe that the mechanic did indeed check the compression on that CYL when he was doing his diagnostics, so we've kinda looked in the opposite direction.

It really does seem like a fuel problem to me, but I'm no mechanic. Could the knock sensor create a false lean misfire in just one recurring cylinder?

Since the guy has thrown his hands up at the problem, could someone tell me what is involved with pulling the #2 injector and cleaning it manually, sans magic bottle of goo?

Has he/myself overlooked something obvious?

Is there a chronic problem that one of you folks may know of?

I'm desperate here, and will be going back out of town mid-week of this coming week and really, really need this car back on the road. Any Ideas?
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Last edited by GYates; 08-19-2006 at 03:32 PM.
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Old 08-22-2006, 09:11 AM   #2
Scooby Newbie
Member#: 123476
Join Date: Aug 2006

Too much information? I was hoping that this may be something typical amongst phase II 2.5. Can anyone offer a lead or point me in another direction?
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Old 08-23-2006, 12:46 PM   #3
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Chapter/Region: E. Canada
Location: Ajax, Ontario, Canada
03 Sonic YellowWRX
03 BH Titanium


I say change the knock sensor, if it comes up in a new scan, ie, still a problem.

Knock sensors are consumables on our cars, go regularly, and should be replaced if the car needs one.
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Old 08-23-2006, 01:57 PM   #4
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Join Date: Aug 2006

So, a knock sensor could just cause a misfire in one cyl.?

Is there are preferred brand of knock sensor to use? I see that some of the parts places sell different brands, but if they are a consumable, would I just be better off buyest the least expensive?
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