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Old 01-08-2010, 01:04 AM   #1
tony.bas
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Default Need Help Urgently - Mystery Problemm

Ok I have a 2002 Subaru WRX STi. About 2months ago I was drivin aound like normal no probs, then I went down the shops and once I stopped and the car idles it was misfiring and really rough idling. I had to move states so I needed it fixed quickly took it to my mate who was a mechanic and he thought maybe the engine was ****ed but he did compression check on the engine all 110% good.

Next he checked the injectors, they were 110% great even did the injectors clean.
Next checked the coil packs, they were 110% great.
Thought maybe it was a vaccum hose leak, that wasnt it either.
Checked the apexi I had installed that was all good
Checked the 2005 cluster I had installed that was all good.
Next the ECU was checked but an auto electrian it is fine. We also thought it was maybe the keypad, so auto electrian took that out.

Still nothing..... suggested it might be the MAF sensor. Soooo went and bought a new MAF sensor. Still not fixed.

Noticed that when I cleaned the idle air control valve that the gasket had split when I put it back on.. so went out bought new gasket and screws. Still nothing....

I have to get this fixed im going crazy. Any mechanics or ppl who have had similar probs please share. Cheers Tony
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Old 01-08-2010, 01:08 AM   #2
Agkelos
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Have you put new gas in it since the problem started? You may have got a bad tank.
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Old 01-08-2010, 01:14 AM   #3
Natas78
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Did he check the spark plug's ?
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Old 01-08-2010, 01:37 AM   #4
tony.bas
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Hey, yeah the car actually fixed it self initially for 5min then went bad again, spark plugs are the first thing I thought of and after changing them no difference. After awhile the ECU fuse blew, fixed that then after bout 2days of my mechanic working on it, it fixed itself, filled the whole tank up with petty, got it on the train to go interstate, was fine for bout 1 week then I was driving and all the sudden it happened again.

Also before I went to the shop the day it happened when I switched on the car it made a loud hissing/high pitch noise, me and my gf both looked at each other, I think it came from the back she thinks it came from the bonnet.
Also heard that noise at Autobarn just (before it went bad the 2nd time) when I got the spark plugs.
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Old 01-08-2010, 01:55 AM   #5
Nurreg
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Mechanical problems don't just re-fix themselves after turning the car off and on. Check your ECU. Are you running a stock 02 STi? Do you have access to another stock 02 ECU to swap in and test? (Not sure if you can do this with rexies, I know it can be done with other cars). Have you checked -ALL- your sensors? If you can swap another stock 02 STi, check for any codes again. Try get Subaru to run a scan. Some dealerships in NSW are quite generous and will do a quick scan for free/low price. Not sure how Perth is. Any burning on the PCB board/resistors/bloated caps?
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Old 01-08-2010, 01:57 AM   #6
akeric
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Your going to be chasing this for a long time until you start to attack it with a methodical approach.

You need to hook up a datalogger, (Romraider) and see what is going on. It could be anything but if I had to GUESS based on what you've said. If its intermittent and your car is an 02.....I would look at an electrical issue. Maybe a wire somewhere is grounding out. This is rare in a stock car but if its been modded you would be surprised where rubs can occur.

Hissing is normal on startup, fuel pump priming. When I installed my stand-alone ECU it changed the way the fuel pump sounds, the first time I thought something was out of wack but the car ran fine.

Its is 100 times harder to diagnose something over the net , you need to either hook up some logs and look for the problem, or take it to a mechanic. Either way don't dump anymore $$$ into it until you know whats wrong.

I know in your first post you said your buddy was a mechanic.....well there is a checklist and if he is, then he can go down it and test items to find what the problem is before telling you to buy something.

Good luck,
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Old 01-08-2010, 02:03 AM   #7
Nurreg
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On a side note - My 06 idles rough at times. Others have noticed this on the 06 CS9 and the STi. People just upped the idle. How rough is rough, though?

Unplug a plug at a time. Does the engine sound like its running on one less cyl per plug pulled? If so - good. if not - check that coil/plug/connector.
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Old 01-08-2010, 02:37 AM   #8
tony.bas
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Yeah I did speak to the Subaru dealer here in Perth but he want $130 to do diagnostic, I know thats the best choice right now but was hoping I missed something easy that could be fixed.

When I say its running rough it sounds like really bad miss fire, when testing the coil packs we took 2 off running the car on 2 cylinders and it sounded the same. After I bought the gasket for the IACV it did sound alot better but still on idle miss firing.

When I drive it its fine just loss of acceleration and general performance(not driving hard btw) but when its on idle you can hear that its not right for a scooby to run that way.

I'm flat broke from all the parts and repairs atm but next week I will take it to get diagnosed, do you think it will damage the engine by driving it to the dealer which is bout 10km away, or should it def be towed??


Another thing also, I read on a thread this that an alternator on its way out can drain a battery and cause similar probs, I just bought a new batt cause mine went dead, could this be an optional fix??


Also when it started it would fix itself but now its just crap, but I guess I haven't been driving for it to fix itself.... no it did fix itself for bout 30sec after reseting battery the other week

Last edited by tony.bas; 01-08-2010 at 02:49 AM.
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Old 01-08-2010, 02:56 AM   #9
tony.bas
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Another thing is theres a real strong fuel smell, like its running rich.

Fuel pump maybe??
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Old 01-08-2010, 03:03 AM   #10
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Quote:
Originally Posted by tony.bas View Post
Another thing is theres a real strong fuel smell, like its running rich.

Fuel pump maybe??
possibly... or a short in the FP wiring.

Could also be a badly clogged fuel filter or FP sock(in tank)
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Old 01-08-2010, 03:22 AM   #11
tony.bas
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Went outside had another fiddle with the sensors, when i took the alternator sensor out it stopped the misfiring/putting but engine still rough in the sense its shaking, which isnt usual for my car. Also took the ecu sensor/harness out and it had alot of oily grease on it. Had another look over the vaccum lines, they're all good.
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Old 01-08-2010, 04:36 AM   #12
akeric
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Rough idle to me means 1 or 2 things. Usually its a fueling issue. There is almost no reason for timing to change from a faulty sensor or anything of that issue. If your plugs are good and the coil packs are fine and your getting a good spark then to me it really sounds like fuel.

That being said you can be running lean at idle, I had a problem like that once and every so often it would make a 'puh' sound which you could hear. Try unplugging the MAF sensor. That will force the car into a very basic MAP based fueling mode. If they idle clears up you know that either A) your maf sensor is faulty B) you have some kind of leak somewhere letting in unmetered air.

As for is it safe to drive.....well its hard to say until you know whats wrong. If you unplug the maf sensor and it clears up then I can tell you that running the car in MAP based fueling is safe just go easy on it.

See what that does.
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Old 01-08-2010, 04:54 AM   #13
tony.bas
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I bought a new maf sensor and it wasnt the problem, all stayed the same. Normally when the maf sensor is removed the car stalls but in my case it doesnt.

I've got it sounding better now cleaned some sensors and fiddled around. Nearly sounds normal but still a little off
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Old 01-08-2010, 06:56 AM   #14
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Your fuel pressure is?

The voltage when the car is running is?

You'll need to check these when the car is malfunctioning. Yah...I know...good luck timing it so you can do that. If you can't find anything, remove, clean and reconnect all major grounds.

The blowing fuse for the ECU has me bothered, however. A fuse doesn't just blow for no reason.
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Old 01-08-2010, 09:26 AM   #15
Nurreg
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Subaru are charging you that much in Perth? So glad I don't live in the desert!

You got done by your 'mechanic' mate. How can you not test before replacing a part? Could have saved so much money and gone the smart route and got a proper ECU scan at Subaru.

Just remember for next time, If it fixes itself after turning the car off an on, It's electrical. ECU, Sensors, what ever. Mechanical faults don't just repair them selves like that
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Old 01-08-2010, 09:53 AM   #16
chapstien
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Did you check the clamps on the intercooler?
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Old 01-08-2010, 09:54 AM   #17
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All that and no CEL? weird.
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Old 01-08-2010, 03:34 PM   #18
akeric
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I'm telling you..... unplug the maf ....start the car (it will start).... see if it clears up. This will cause the car to run based on just the MAP sensor and the ECT sensor. Remember it might not be a sensor especially if your blowing fuses.....a short in a wire somewhere can cause that as well.
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Old 01-08-2010, 03:45 PM   #19
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Sounds like the "mechanics" looking at this are just parts-changers and not real technicians. By the time all is said and done, you'll have spent far more than the $130 that Subaru was asking for a proper diagnostic, and you may still not have an answer. Suck it up and take it to someone who knows what they are doing.
In the meantime check all the main power and ground cables between the battery, engine and frame for cleanliness and tightness. You might just find your problem there.
Oh, and what the heck is an "alternator sensor"?
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Old 01-10-2010, 07:20 AM   #20
tony.bas
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Yeh well thats what im going to do take it for a subaru scan see how it goes,i forgot to mention this all hapened the day after i changed the oil and filter,i came home after a good pull on the freeway,went to go down the road as i started car heard a long whine from the fuel pump which it nornally only primes after you turn the key on but this was different it sounded like it was priming when the engine was on then thats when engine started to run rough, so i'm def thinkn fuel pump or i heard maybe a carbon clean,maybe the oil change bought some carbon up in the engine!
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Old 01-10-2010, 07:27 AM   #21
tony.bas
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Could it also be an 02 sensor can that cause rough idle?
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