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Old 08-20-2012, 04:54 AM   #1
FoVeoPhotography
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Member#: 329665
Join Date: Aug 2012
Chapter/Region: W. Canada
Location: Edmonton, Alberta
Vehicle:
1993 Subaru WRX RA
Red

Exclamation 1993 WRX rough idle & loss of power

Hey all I'm new here and I seem to be having some issues with my 93' WRX (JDM EJ20G) . I just finished with an engine rebuild (as it had a blown head gasket) and replaced most of the gaskets and basically did a full service of the vehicle (such as: Head gaskets, intake manifold gaskets, exhaust manifold gaskets, valve cover gaskets, knock sensor, timing belt/belts, etc.). I also replaced one of the heads because the valved were unbelievably bent and did not allow for any compression.

Once everything was set and done it was great fun! I did however have a cel code (45 pressure duty solenoid? If I'm not mistaken.) however other then that everything was great, made heaps of power and was a blast to drive. This, however, lasted for an hour before things took a turn for the worse. The vehicle backfires a lot (might be running rich) and the "cat on fire" light came one. once this happened the car decided to have almost no power and have a really rough idle (almost as bad as when it was running on 2 cyl when it had bent valves). and when it drives it had very little power (uphill almost none) and back fires like CRAZY (explaining why my cat hates life).

Since I wasn't too sure what the problem was I decided to check the timing belt, since the tensioner was compressed 4 or 5 times during the build i thought maybe that had given way, however it seems it has not and it also seems that the timing is spot on (however, I may get a new one just in the off chance). Also looked around for vacuum leaks and haven't found any.

What's everyone's opinion on this? I have no cel codes other then the one (45). Maybe the front o2 sensor bit the dust? Later on I'm going to do a compression test to make sure the valves didnt decide to become one with the piston.
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Old 08-20-2012, 12:06 PM   #2
ToneWrx02
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Silver

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Running rich, or check spark, might not be getting spark so the fuel is unburnt and causing backfires. Could be as simple as spark plug wire got loose.

Last edited by ToneWrx02; 08-20-2012 at 12:18 PM.
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Old 08-20-2012, 12:06 PM   #3
ToneWrx02
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Silver

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Just a thought, this is a us forum so 02wrx and after knowledge here haha
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Old 08-20-2012, 03:48 PM   #4
i_c_the_light
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Quote:
Originally Posted by ToneWrx02 View Post
Running rich, or check spark, might not be getting spark so the fuel is unburnt and causing backfires. Could be as simple as spark plug wire got loose.
No plug wires on this bitch.

OP, I would look at the oxygen sensor as the culprit here. These engines don't have a lot that can go wrong and I can only think of the oxygen sensor that would give you those symptoms.

Oh and when or if you can...go catless. For real ****s and giggles get a real basic MBC and sit around 14-16 psi.
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Old 08-20-2012, 04:43 PM   #5
FoVeoPhotography
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Join Date: Aug 2012
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Location: Edmonton, Alberta
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1993 Subaru WRX RA
Red

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Quote:
Originally Posted by i_c_the_light View Post
No plug wires on this bitch.

OP, I would look at the oxygen sensor as the culprit here. These engines don't have a lot that can go wrong and I can only think of the oxygen sensor that would give you those symptoms.

Oh and when or if you can...go catless. For real ****s and giggles get a real basic MBC and sit around 14-16 psi.
Alright ill go find a front o2 sensor and get her up and running.

First I need to get it inspected, then I'm going straight pipe all the way through to blast pipes. should be a fun little thrasher!
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Old 08-24-2012, 04:11 PM   #6
FoVeoPhotography
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Join Date: Aug 2012
Chapter/Region: W. Canada
Location: Edmonton, Alberta
Vehicle:
1993 Subaru WRX RA
Red

Default

So found the problem. however it passed the inspection on 2 cyl... lmao

bad coil packs, should have checked those first... always hear about them going on these things ahaha. I'm gonna pick up some older style packs for temp and rewire the new style for my wiring.
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Old 08-24-2012, 04:50 PM   #7
ToneWrx02
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Vehicle:
2002 Wrx
Silver

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Quote:
Originally Posted by FoVeoPhotography View Post
So found the problem. however it passed the inspection on 2 cyl... lmao

bad coil packs, should have checked those first... always hear about them going on these things ahaha. I'm gonna pick up some older style packs for temp and rewire the new style for my wiring.
AHA! SO I WAS RIGHT! it was something to do with the spark! told ya
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Old 08-25-2012, 05:40 PM   #8
FoVeoPhotography
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Member#: 329665
Join Date: Aug 2012
Chapter/Region: W. Canada
Location: Edmonton, Alberta
Vehicle:
1993 Subaru WRX RA
Red

Default

Quote:
Originally Posted by ToneWrx02 View Post
AHA! SO I WAS RIGHT! it was something to do with the spark! told ya
I'm a little chapped... Thing is right after the build was done I checked out all the coils and they were igniting... I just assumed because this is my first subaru. I didn't think two would just die .

Ah well, for now im gonna get some of the old style coil packs off my bud, then in the future invest in the new style and rewire the damn thing.
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Old 08-25-2012, 06:25 PM   #9
i_c_the_light
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1994 Legacy
"The Silver Slug"

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I should've known myself.
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