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Old 07-07-2004, 12:13 PM   #1
Phantom Rex
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Default Engine won't stay running. Need help.

I was driving home from work Monday morning on the Interstate when my engine shut down, and I had to have it towed back to my house. Every time I try to start the car the engine will turn over, but when I give it gas it chokes and dies. There's a Very Strong smell of gas and there's black smoke coming from the exhaust.

Here are my mods: Perrin uppipe, intake, inlet hose, downpipe, and cat back exhaust. APS dischage duct.
Cobb AccessPort Stage 2. (2004 WRX- 5400miles)

Any suggestions or ideas would be greatly appreciated. Thanks.
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Old 07-07-2004, 12:29 PM   #2
wix
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What was the most recent thing done to the car?
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Old 07-07-2004, 12:35 PM   #3
DrBiggly
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I don't know much about the AccessPort, but you can probably toss the stock intake back in and drive on the stock ECU. Could be a bad setup on the AccessPort?

Sounds like way too much fuel from something; I'd eliminate both of those as they can alter your a/f ratio quite a bit. Use that as a starting point for your troubleshooting.
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Old 07-07-2004, 02:34 PM   #4
Phantom Rex
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Wanted to thank everyone for the advice, and let you guys know that my car is running. I still have the after market intake on, and I'm still using the Stage 2. The difference being I unhooked the sensor resting on top of the intake filter. A temporary solution until I can dig out my stock intake.

Does anyone know if the stock intake will work with and aftermarket inlet hose?
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Old 07-07-2004, 02:41 PM   #5
DrBiggly
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Wait you unhooked the MAF sensor? No wonder the car won't run! It has no clue how much air is coming in there so it's gone into limp mode. Hook that back up, NOW!

The aftermarket inlet hose should be just fine with the stock intake as long as they mate up and have no air leaks. Unmetered air is very bad for the car; it has no idea how to make it run correctly that way.
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Old 07-07-2004, 03:11 PM   #6
Phantom Rex
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[quote]Originally posted by DrBiggly
[b]Wait you unhooked the MAF sensor? No wonder the car won't run! It has no clue how much air is coming in there so it's gone into limp mode. Hook that back up, NOW!

Let me explain. When the car initially broke down on Monday morning the MAF sensor was hooked up. Yesterday, with the
MAF sensor hooked up, the engine would turn over, but when I gave it any gas it would shut down. At this point there was a very strong smell of fuel and black smoke coming from the exhaust.

Today, I took off the intake filter, the car started with no problem. There was no smell and no black smoke. I put the intake back on, unhooked the sensor, and again the car started and ran with no problems. However, when I hooked the sensor back up that's when I started having the same problems.

I believe you hit the nail on the head when you mentioned the
a/f ratio. Don't know for a fact, but it would seem that the sensor
was reducing the amount of air to the point that the engine was getting not enough air and too much fuel.
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Old 07-07-2004, 03:57 PM   #7
DrBiggly
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Well, that makes a little more sense. Knowing that I say this:

I think your computer is calculating for something that is entirely out of range, and for some reason unhooking the sensor and dropping back to defaults is bringing it pretty close to mediocre. I still recommend putting the stock intake back together (including hooking up the sensor,) and undoing the AccessPort for a bit to eliminate those two variables. If the car runs fine that way, go from there.
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Old 07-07-2004, 04:36 PM   #8
Phantom Rex
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Definitley. Once I get a little time, I plan on doing exactly as you suggested. Thanks for all your help, Doc. Very appreciated.
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Old 07-14-2004, 12:34 AM   #9
Phantom Rex
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Wound up going to the dealer yesterday. I spent the better part of four hours there only to have the service rep tell me that my MAF sensor was shot. They wanted an extreme amount of money to replace it, and weren't able to guarantee that would fixed the problem. Mind you, they never actually mentioned what the problem was. Guess I should have had them be more specific. Anyway, I bought the new sensor with the intention of installing it myself in order to save some money on the labor. The part alone cost me a pretty penny.

I installed the new sensor, put the stock intake back on, and reset the ECU back to stock as well. I did all of this only to have the exact same problem. With the sensor hooked up the car runs rich to the point of choking and not starting. With the sensor unhooked, the car receives too much air and not enough fuel. Strong drag, very little pull, unnoticeable boost. It's like the turbo doesn't exist.

I've reached a brick wall and don't know where to go or what to do. Please spare a suggestion or thought to help out the village idiot.
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Old 07-14-2004, 12:54 AM   #10
supermarkus
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Are you sure you have the MAF sensor oriented correctly? It can be put in backwards. I would advise against running it in the wrong orientation. On a stock WRX the plug faces the bumper end of the engine bay, if your plug is facing the firewall, it's backwards.
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Old 07-14-2004, 01:03 AM   #11
Phantom Rex
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Yep, the sensor is installed correctly. The plug is facing the bumper.
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Old 07-14-2004, 01:16 AM   #12
supermarkus
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Check your intake path to make sure there are absolutely no leaks, especially around the intercooler piping. It couldn't hurt to double check your grounds and coil packs either.
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