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Old 06-30-2005, 02:50 PM   #1
SuBart
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Default What can it be?

Not sure what engine problem I have maybe someone could help me out.
I was driving and the check engine light came on and the car felt like it lost all power. I almost had to have it the pedal to the metal for it to go. It felt like I was driving on 1 cylinder or 5 hp. My 0-60 time must have been in the high 30 seconds. Then when I came to a red light and let of the gas and put it in nuetral the engine shut off. It started back up and had an uneven idle and the problem continued all the way home. After getting home I waited about 30 min and started the car again and everything was fine except that the check engine light stayed on. WHat can this possibly be? The closest Subaru dealer to my house is about 200 miles away.
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Old 06-30-2005, 02:58 PM   #2
DreddRS25
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Could you rev past 4000-4500rpms?

What year is your vehicle? It could be a faulty MAF sensor or bad A/F sensor (front 02 sensor).
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Old 06-30-2005, 06:47 PM   #3
Tim Sanderson
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Year, make, model, mods, and mileage please.
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Old 06-30-2005, 06:50 PM   #4
MrViggy
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What about an Autozone? Most of them have the generic ODBII reader, and let you use them in the parking lot for free. That might give you a hint as to what's wrong.

Viggy
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Old 06-30-2005, 08:31 PM   #5
SuBart
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98 Subaru Impreza RS; 80,000 miles. Later today I got in and the check engine light turned off and everything was fine for the first 15 miles of driving, then same thing check engine light and no power. And yes I could rev past 4,500 rpm. It just feels like the car has 1 hp. THen when I got home turned it off and back on again everything was fine except the check engine light was on. I wonder if the 120 degree, dusty Arizona weather has anything to do with it.
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Old 06-30-2005, 09:07 PM   #6
Tim Sanderson
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My guess is it's going to be coolant temp sensor or front air/fuel meter(o2).

Just a guess, get the codes pulled.
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Old 06-30-2005, 10:14 PM   #7
SuBart
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Thanx, Ill go to Autozone tommorow and let you know if you were right.
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Old 07-01-2005, 09:22 AM   #8
DreddRS25
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I read somewhere that on startup subarus run in open-loop mode which disregards the A/F sensor. Once it reachs a certain operating temperature, then it moves into closed-loop mode (A/F driven). So my guess would lean toward the front converter sensor, though, I don't know much about coolant temp sensor. So definitely let us know how this works out. GL!
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Old 07-02-2005, 07:03 AM   #9
Al_Smokemcrack
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You would be correct, though all modern cars do that, not just Subarus. When the O2 sensors aren't all warm and working yet, the ECU just uses a basic best-guess fuel map and calculates fuel delivery based on that map and the other sensors that are working. That's open-loop. Closed-loop is when all the sensors are working properly and it can more accurately calculate fuel deliver. This is one of the reasons why it runs so much better (and generally less rich) once it's warmed up.
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Old 07-02-2005, 04:07 PM   #10
SuBart
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Just got back from getting the codes checked
TROUBLE CODES:
P0103 (Mass or volume air flow circuit high input)
P1507 (Manufacturer specific powertrain trouble code)

I know the first one is the MAF, but the second I'm not sure. I think it's probablt because of the MAF also.
Checkers Auto Parts is trying to charge me $220 for the MAF sensor and $35.00 for the "Core MAF" (<----what is that?) THey said these are the parts I need. Is there any other place I could get the MAF for less? Thanks.
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Old 07-02-2005, 04:42 PM   #11
gtwagon941
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Quote:
Originally Posted by SuBart
Just got back from getting the codes checked
TROUBLE CODES:
P0103 (Mass or volume air flow circuit high input)
P1507 (Manufacturer specific powertrain trouble code)

I know the first one is the MAF, but the second I'm not sure. I think it's probablt because of the MAF also.
Checkers Auto Parts is trying to charge me $220 for the MAF sensor and $35.00 for the "Core MAF" (<----what is that?) THey said these are the parts I need. Is there any other place I could get the MAF for less? Thanks.

As posted here: http://forums.nasioc.com/forums/show...hreadid=298963

P1507 Idle control system malfunction (fail-safe)
P0103 Mass air flow sensor circuit high input

there you have it. I believe it is called the IAC for the first, and you know MAF for the second.

Jared
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Old 07-02-2005, 07:41 PM   #12
SuBart
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Thanx, Now the IAC is that an expensive repair? and what is a good place to get the MAF without paying too much.
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Old 07-03-2005, 01:53 AM   #13
Al_Smokemcrack
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The IAC can often be cleaned to resuscitate it. I forget how you do this, exactly, but a search will probably tell you fairly quickly.
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