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Discussion Starter #1
Alright here is the specifics - 1996 OBW recent tune up (last 500 miles) new plugs, wires, fuel filter, both O2 sensors and knock sensor and seafoam engine and fuel treatment. Had a slight miss/hesitation especially before the engine warms up before the tune up. Thought it would take care of it. After tune up - same thing. Here is the bad part. Before the tune up 257 miles on a tank - hwy driving at 60mph. Now I am at 1/4 tank left and at only 189 miles. I checked the tires all same size and inflation. I am going to change the diff fluid and see what that does - but this miss/hesitation is killing me. This is my first subaru so I am almost at an end point at what to do. The only other things I can think of are an ignition coil on it's way out or MAF? What about a leaky injector or something? Any thoughts from the guru's?
 

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MY12 WRX, MY07 FXT
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Well.

I would say at a minimum clean the MAF sensor's wire.

Then check the TPS voltage.

And also, did you disconnect the battery/reset the ECU after all that recent work?

Brian
 

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i take it the cel is not on ? if it is , you need to pull the codes.

i'm guessing the mileage is related to the miss so i'd concentrate on that for now.

seems like the car is going in to limp mode.

like suggested,

clean maf,

check tps is functioning correctly,

could be clogged inj, bad inj wire connection

shorting coil

burned valve or just way out of adjustment

bad coolant temp sensor

bad knock sensor

stuck pcv valve

let us know if there are any codes
 

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Discussion Starter #4
I have replaced the PCV valve and the knock sensor. Battery was disconnected for at least an hour after all of this work was completed. No CEL. How do you exactly clean the MAF sensor?
 

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1996 Subaru Legacy Outback 2.2L AT
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Make sure your running premium. Some of you guys may think i'm wrong but i also have a 96 and yes it makes a difference but only in 96. My car wouldn't even have power to get out of the driveway when i put regular gas in it, it would stall, miss, barely run and even backfire. I put put premium back in it and it's been fine since.
 

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Discussion Starter #6
Well I am ready to fill up and since gas has dropped like a rock I wouldn't feel too bad for filling up with premium..I can try that and know pretty quick..
 

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1996 Subaru Legacy Outback 2.2L AT
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I noticed in my chrysler that when i run premium i get about 4 more miles to the gallon so thats like a 20% increase, and the difference between 2.60 a gallon for regular and 2.90 a gallon for premium is 11%. so in theory its cheaper for me to run premium in my chrysler. But its tuned to run on premium and its better for the feul system anyway so i run premium in everything. Not sure on mileage difference in subaru yet, just started driving it again for winter


and if you check your manual the 1996 2.5l models are required to run Premium. Yes us 96 guys had to run premium but still had 10 less hp than the 97-99 models that run regular gas.
 

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Discussion Starter #8
So I am trying to concentrate on the engine and listening to hear if I hear something out of the ordinary and while I am driving - with the cruise crontrol off - I hear alot of clicking underneath the kickpanel, dash area. When it clicks I can notice a difference in how the engine is running. I wonder if the cpu is going out?
 

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1996 Subaru Legacy Outback 2.2L AT
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the ecu is behind glove box but i wouldn't imagine you would be able to hear it even if it was bad, the noise is probably your key chain but i don't know. your gonna need someone elses help on that one
 

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2005 OBW 2.5L, 1989 Subaru Justy, RIP Blu
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If the ECU was going out wou would know it.

Do you always get gas at the same station?

What brand of wires?

How old is the Oxygen sensor, im thinking your O2 sensor is going out.

nipper
 

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Discussion Starter #11
get gas at different stations, both O2 sensors were replaced during the tune up and it is not my key chain. Sounds like a relay or some circuit opening and closing..
 

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2005 OBW 2.5L, 1989 Subaru Justy, RIP Blu
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For now always get gas at the same brand of station.

If you rule out everything else, it may be a valve adjustment is needed.

What brand wires?
What Brand front O2 sensor?
How old is the timing belt?


nipper
 

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1998 Subaru Legacy Outback
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get gas at different stations, both O2 sensors were replaced during the tune up and it is not my key chain. Sounds like a relay or some circuit opening and closing..
Bump :)

Ever find the issue?

Thanks.
 
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