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Old 07-11-2016, 06:02 PM   #1
Chiller449
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Member#: 450535
Join Date: Jul 2016
Chapter/Region: NWIC
Location: Indiana
Vehicle:
1998 Impreza L
Red

Default New Subaru owner Having engine problems.

Hello all! Just purchased my first Subaru! Ive always wanted one and I jumped on this one when I found it.
Its a 1998 Subaru Impreza L. 2.2L engine 5 speed manual.
When I bought it I knew it had a bad throw-out bearing. So im planning on replacing that and the clutch while im in there.
My problem is that after driving the car for maybe 7-8 minutes it starts missing and chugging almost like its losing spark or running out of gas. Its very prominent in 1st gear as I can barely get going and everyone is laughing at me as it stalls 3 or 4 times before it can get going. The check engine light is on so I had Autozone read them. Here are the codes:

P0304 - Cylinder 4 misfire
P0135 - HO2S-11 (bank 1 sensor 1) Heater circuit malfunction
P0141 - HO2S-12 (bank 1 sensor 2) Heater circuit malfunction
P0301 - Cylinder 1 misfire
P0302 - Cylinder 2 misfire
P0303 - Cylinder 3 misfire
P0325 - Knock Sensor 1 Circuit Malfunction
P0440 - EVAP system performance
P0483 - Cooling fan relay system performance
P1100 - Starter Switch Circuit low input

Im not sure if one thing is causing all of this or a bunch of little things. Autozone suggested replacing my ignition coil. The car runs great until it gets to operating temp. then if I shut it off for a minute or 2 and start it it will be fine for another 2 to 3 minutes and continue what is was doing.
Any suggestions on where to start???

Thanks for any help!!
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Old 07-12-2016, 01:24 AM   #2
CosmoTheCat
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Is bigger than yours.

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Inspect your battery cables for corrosion, check all of your engine harness ground connections, starter, alternator, and the engine ground at the starter. Look for corrosion within the strands of wires as well as at the terminals themselves.

The odds of all of those systems having faults is pretty slim. I'd suspect a grounding issue, perhaps unplug the engine harness main connector and inspect the pin terminals in that too.
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Old 07-12-2016, 01:40 AM   #3
Blksti_16
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I would replace all spark plugs and wires if all clyinders are missing.
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Old 07-12-2016, 03:46 PM   #4
Chiller449
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Location: Indiana
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1998 Impreza L
Red

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Quote:
Originally Posted by CosmoTheCat View Post
Inspect your battery cables for corrosion, check all of your engine harness ground connections, starter, alternator, and the engine ground at the starter. Look for corrosion within the strands of wires as well as at the terminals themselves.

The odds of all of those systems having faults is pretty slim. I'd suspect a grounding issue, perhaps unplug the engine harness main connector and inspect the pin terminals in that too.
Quote:
Originally Posted by Blksti_16 View Post
I would replace all spark plugs and wires if all clyinders are missing.
I have disconnected the battery hoping it will clear the codes. I'm thinking most of them are probably old codes that were never deleted. I am going to replace the coil, plug wires, and spark plugs. I will check all the connections also. The battery terminals look good. Also I have the hood that has the openings in it. should I close off the ones that are over electrical components? I know one of the is right over the battery. Not sure if its supposed to be like that or if someone made it that way.
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Old 07-12-2016, 06:03 PM   #5
monkeyposeur
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Take a look at your knock sensor. They crack with age and can cause your car to run like crap. It's a cheap easy fix. For my NA subies I have bought cheap $15 ebay knock sensors and they worked great with no issues. I generally avoid cheap knock off parts too.
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Old 07-12-2016, 07:42 PM   #6
Chiller449
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1998 Impreza L
Red

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Quote:
Originally Posted by monkeyposeur View Post
Take a look at your knock sensor. They crack with age and can cause your car to run like crap. It's a cheap easy fix. For my NA subies I have bought cheap $15 ebay knock sensors and they worked great with no issues. I generally avoid cheap knock off parts too.
Where is it located? ive never worked on a boxer engine before.
I looked it up. it appears to be below the throttle linkage??

Last edited by Chiller449; 07-12-2016 at 07:58 PM.
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Old 07-12-2016, 09:41 PM   #7
Chiller449
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Ok so while I was bumbling around the engine bay looking for the knock sensor I stumbled upon 2 connectors that were not plugged in. They are on the passenger side kinda below the air intake tube towards the firewall. One is a square connector with 4 wires coming from it and the other is kinda triangular and has 3 wires coming from it. So I search some more and find that both my o2 sensors are disconnected. The front one looks as if the wires somehow got cut half way up from the sensor and someone did a botched wire job and connected them back together. It has a square plug and fits in the 1 open connector that I found. I look at the lower 02 sensor and the connector has been dragging the ground and is all torn up. I found what I believe is the piece of harness that runs from the rear o2 sensor up to the engine but the connectors dont match up, and neither do the wire colors. Both my o2 sensors have 1 black wire and 2 white. I'm not sure whats going on here. Wrong o2 sensors? Wrong connectors? Does anybody have a pic of where the o2 sensors on their car hookup? I'm lost here. I'm gonna try a local junkyard to see if I can find that engine out there. Maybe I can see where they go from there. But pics would help.

Also could these disconnected 02 sensors be causing my stuttering and stalling problem when the engine warms up?

Last edited by Chiller449; 07-12-2016 at 09:52 PM.
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Old 07-12-2016, 10:26 PM   #8
Chiller449
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So after searching the forums about my p1100 code I found a guy that was having the same stuttering and loss of power as i am. He said he had a problem with his o2 sensors. replaced the upstream sensor and it went away and everything went back to normal! Maybe this is whats causing my engine problems. I bet once I get this o2 sensor situation handled ill be good to go.
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Old 07-13-2016, 12:18 AM   #9
monkeyposeur
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Quote:
Originally Posted by Chiller449 View Post
Where is it located? ive never worked on a boxer engine before.
I looked it up. it appears to be below the throttle linkage??
Its under the intake manifold behind the throttle body towards the back of the block and on the driver's side half. Pretty easy to spot.

Yeah, not having your o2 sensors hooked up is bad, m'kay.

Check your pm for info about the factory service manual w/diagrams.
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Old 07-13-2016, 02:04 PM   #10
Chiller449
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Red

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Quote:
Originally Posted by monkeyposeur View Post
Its under the intake manifold behind the throttle body towards the back of the block and on the driver's side half. Pretty easy to spot.

Yeah, not having your o2 sensors hooked up is bad, m'kay.

Check your pm for info about the factory service manual w/diagrams.
Checked the wiring diagram. The only page I could find about 02 sensors does not match what I have. My o2 sensors have 3 wires. 1 black 2 white. The diagram says it has 4. Also the wire colors dont match what I have on my car. Im pretty sure that my front 02 sensor hooks up to the forward most connector. But the connector has 4 wires coming from it? the rear I think hooks up to the triangular connector, But the connectors are different. The 02 connector is square and this one is triangular. both have 3 wires though. I tried looking at my local junkyard and could only find 1 subaru and it was a legacy GT with the 2.5 I think. It has a different setup.
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Old 07-13-2016, 06:16 PM   #11
Chiller449
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I think I got it figured out. I will post results.
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Old 07-13-2016, 06:27 PM   #12
Joshfl420
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Those two codes p0135 and p0141 are directly connected to the missing or faulty O2. You could open source the rear one out for "testing" and replace the front one.
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Old 07-13-2016, 08:04 PM   #13
Chiller449
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Join Date: Jul 2016
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Location: Indiana
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1998 Impreza L
Red

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Ok so i have managed to figure out the wiring!! Big thanks to monkeyposeur for supplying me with wiring diagrams. Couldn't have done it without them.
For anyone wondering when u have 3 wires coming off your 02 sensor black is 12v switched and one white can be ground and the other white can be the signal wire to the ecm. The white wires can be interchanged. I just figured out which wire was positive and which was ground on my plugs coming from the ecm and the other has to be the signal wire to the ecm. (rear o2 sensor plug coming from ecm has 4 wires, 2 are ground.)

Is this going to fix my stuttering problem? Who knows. I'll drive it home tonight and post in the morning if ive had any success.

Last edited by Chiller449; 07-13-2016 at 08:10 PM.
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Old 07-14-2016, 01:03 PM   #14
Chiller449
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Location: Indiana
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1998 Impreza L
Red

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Ok so it is running way better than before. No more stalling or jerking. It does still have a miss though. Im going to pull the plugs at work and check for any that have fouled out. Im sure at least 1 has with it dumping a ton of gas into when the o2 sensors were unplugged. Ill post my results!
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Old 07-14-2016, 02:47 PM   #15
Chiller449
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1998 Impreza L
Red

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Well it was running good. It gave up on my way to work this morning. just bogged real bad started missing and died. Tried limping it to work but then the clutch finally failed. So im replacing the coil, plugs, wires, maybe the 02 sensors, throwout bearing, and clutch. Ill update when i get it fixed. I think my miss is from fouled out plugs from when the o2 sensors were unplugged and the computer was pumping too much fuel into it. Who knows.

Last edited by Chiller449; 07-14-2016 at 07:55 PM.
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Old 07-16-2016, 09:32 PM   #16
Chiller449
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Red

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Update Time!! I pulled the plugs and they are new. NGK R's I think is what they said on them. They were still shiny and new looking. Plug wires were the same way. The coil looks newer as well. It has no numbers or anything on it but it looks pretty clean. So I moved onto the knock sensor. It has a big ol' crack in the side of it and it is corroded on the bottom. Im replacing it soon. Ill update when complete.
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