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03-05-2008, 06:50 PM | #1 |
Scooby Newbie
Member#: 21370
Join Date: Jul 2002
Chapter/Region:
MAIC
Location: In the #24 Chevy--I mean Subie
Vehicle:01 Impreza RS 2.5 Blew-ridge Pearl |
Help me!!!
I am ready to drive this car off a cliff.
We have an 01 2.5RS, the engine started to have a bad misfire. I replaced plugs and wires, no improvement. Took it to a dealer, they found a cracked y-pipe, also showed codes for misfires on 2,3,4 cyls, cat sysytem efficiency below threshold (p0420), evap emission control system malfunction (p0440), and evap system vent control low imput. We replaced the y-pipe and cats, now runs even worse. If revs go below 4000, the engine just about dies. While we were waiting for cats to come in, the shop put a straight pipe in, and the car ran fine. They installed the cats today and its bad again. Does anyone have any ideas why this would happen? Mike
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03-05-2008, 07:23 PM | #2 |
Scooby Specialist
Member#: 117980
Join Date: Jun 2006
Chapter/Region:
NESIC
Location: Rochester, NH
Vehicle:2005 sti wr blue |
maybe o2 sensor or bad coil
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03-05-2008, 08:06 PM | #3 |
Scooby Newbie
Member#: 21370
Join Date: Jul 2002
Chapter/Region:
MAIC
Location: In the #24 Chevy--I mean Subie
Vehicle:01 Impreza RS 2.5 Blew-ridge Pearl |
Is there any way to test the coils? and if they were bad, would they still work at high rpm's?
Mike |
03-05-2008, 08:24 PM | #4 |
Scooby Specialist
Member#: 168129
Join Date: Jan 2008
Chapter/Region:
SCIC
Location: High Desert
Vehicle:2013 WRX WRBP |
Do you have a digital multimeter? you can use that to check the resistance of the coils but I dont know what the spec is............and no the higher the rpm the more load is put on the ignition system...
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03-05-2008, 08:56 PM | #5 |
Scooby Newbie
Member#: 173384
Join Date: Mar 2008
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Try spraying some water on the coil,if it sparks it is no good.
Does it run bad all the time? Could have jumped time if it runs rough all the time. May have to do a leakdown test just to make sure cylinders are ok. |
03-05-2008, 09:22 PM | #6 |
Scooby Newbie
Member#: 21370
Join Date: Jul 2002
Chapter/Region:
MAIC
Location: In the #24 Chevy--I mean Subie
Vehicle:01 Impreza RS 2.5 Blew-ridge Pearl |
It runs strong over 4000 rpm's, but wants to die below, while you are driving. It will idle about 10-15 seconds smoothly, the drop to below 500 rpms and shake. If you give it the gas it will pick up revs immediately, but then repeat the low idling and shaking. It is very frustrating.
Mike |
03-06-2008, 08:59 AM | #7 | |
Scooby Newbie
Member#: 64646
Join Date: Jun 2004
Location: Northern Virginia
Vehicle:1995 Legacy wagon Green |
Quote:
You could also check the idle air control valve (IACV or IAV, depending on who you talk to). However, a vacuum leak is the first thing I'd look for and it's easy/cheap to fix. --Bob |
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03-06-2008, 12:44 PM | #8 | |
Scooby Newbie
Member#: 21370
Join Date: Jul 2002
Chapter/Region:
MAIC
Location: In the #24 Chevy--I mean Subie
Vehicle:01 Impreza RS 2.5 Blew-ridge Pearl |
Quote:
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03-06-2008, 05:33 PM | #9 |
Scooby Specialist
Member#: 80465
Join Date: Jan 2005
Chapter/Region:
RMIC
Location: Denver
Vehicle:2001 2.5RS Black Diamond Pearl |
on an 01 RS...hmm....there is a vacuum hose to the pressure regulator and cruise control on the passenger side pointing towards the rear. there is the brake booster on the driver side, also pointing to the rear. you can also try looking at the manifold gaskets for the intake, TB, MAP....ummm. IACV too. maybe check the bolt tightness on some things. also check the hose for the gas tank pressure relief, it's right behind the alternator/PS pump. may have a purple electrical connector.
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