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Old 01-27-2019, 08:20 PM   #1
Merko
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1995 GC8C WRX import
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Default EJ20G hesitation and stalling


Hey all, trying to fix my '95 GC8. It idles like crap as per the vid. Also jerks, hesitates and cuts out completely while driving. Then at the 33 second mark in the vid I try to keep the revs raised in neutral but it doesn't hold them too well and also backfires non-stop.

Been trying to fix this for over a year. Have changed many parts and sensors (AFM, crank/cam sensors, MAP sensor, coolant sensor, pressure exchange solenoid, cleaned IACV and installed new gasket, spark plugs, fuel pump, checked all intake hoses for leaks but am now out of ideas).

ECU codes are useless. They always throw up different things. The terrible idle and cutting out I think is just making the ecu get readings all over the place. Most of the sensors for the codes have been addressed with no change.

Have also cleaned the wiring looms in the engine bay for the related codes in case the plugs were dirty.

Also sometimes the car idles fine, but the instant any load is applied to the engine while releasing clutch it cuts out. Then on restart idles fine again til any load applied.

This all started after driving the car on a very hot day on the highway. It just randomly started cutting out and in on the highway and has been stuffed ever since.

Any ideas for what else to check before I burn it?
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Old 01-28-2019, 01:42 PM   #2
Metzenw
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Check coils. They are old.

Double/Triple check for Boost/Vacuum leaks with a Smoke machine or pressurize your intake to about 5 psi with an air hose and use soap and water.

Unplug your O2 sensor and see if anything changes.

Also, find a friend with a known good IAVC and swap.
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Old 01-28-2019, 10:10 PM   #3
Merko
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Yep I was wondering if the coilpacks could be an issue. I converted the car to run newage coils about 6-7 years ago, so probably wouldn't hurt to see if my soldering has fallen apart or test some other coils to start with.
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Old 01-29-2019, 06:41 AM   #4
harveyspecter
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Quote:
Originally Posted by Merko View Post
Yep I was wondering if the coilpacks could be an issue. I converted the car to run newage coils about 6-7 years ago, so probably wouldn't hurt to see if my soldering has fallen apart or test some other coils to start with. Your car is sputters when starting? check out my article to fix https://autofthings.com/car-sputters-when-starting/

Hello!

From what I can hear in the video, you have quite a lot of misfire.
Does the exhaust gas smell like unburnt fuel?
This can be easily caused by bad plugs or coils.

Hope this helps.

Last edited by harveyspecter; 03-03-2019 at 11:44 PM.
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Old 01-30-2019, 10:44 PM   #5
Merko
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Quote:
Originally Posted by harveyspecter View Post
Hello!

From what I can hear in the video, you have quite a lot of misfire.
Does the exhaust gas smell like unburnt fuel?
This can be easily caused by bad plugs or coils.

Hope this helps.
Yes it's misfiring a lot. Exhaust is spraying out black soot over the driveway but it always did this to some extent - maybe a little more now. The plugs literally have about 20km on them as I changed them while trying to find the issue. I think coils are a possibility but after that I'm stumped!
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Old 02-04-2019, 01:57 AM   #6
binny
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check the injectors? if the coils come up all good
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Old 02-04-2019, 11:20 PM   #7
Merko
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Currently waiting for a set of replacement coilpacks to arrive in post. Is there way to check the injectors at home without getting a flow test done?
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Old 02-05-2019, 06:46 AM   #8
thoughto
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O2 sensor or ECU? As was suggested, see if you can swap with someone else's working parts before buying any more replacements. If you unplug 02 sensor and nothing changes, obviously that's not working. Very hot day, maybe a solder joint gave out or an electrical component overheated? Good luck, sounds really infuriating!
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