1999 Subaru Legacy engine hesitates intermitantly upon exce

Tiny
LEONAIZ
  • MEMBER
  • 1999 SUBARU LEGACY
Engine Performance problem
1999 Subaru Legacy 4 cyl All Wheel Drive Manual 200k miles

I failed the idling portion of the CA/smog; co's were at 10 (gross polluter), and then had 02sensor pre catalitic converter replaced and that brought it down to just over 2 (CA requires below 2). Mechanic says he now believes it is the mass air flow sensor but cannot guaantee. We changed plugs/wires and still the intermitant hesitation upon exceleration is a problem. Your advise would be appreciated as this part is very expensive new and I'm afraid to take a chance on a used part because somewhere I read that this was a problem subaru experienced with this year.
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Thursday, August 6th, 2009 AT 2:00 PM

4 Replies

Tiny
KHLOW2008
  • EXPERT
Hi leonaiz,

Thank you for the donation.

As you are aware the MAF is a known issue, the lilelyhood of it being the cause is high.

One way of confirming the operations of the MAF is to run a diagnostics on the MAF to check if the readings are correct under various operating conditions.

What is the engine type of your vehicle?
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Friday, August 7th, 2009 AT 2:56 PM
Tiny
LEONAIZ
  • MEMBER
The engine is the 2.2L single overhead cam model.
Like I said, knowing of the problems with MAF's in 1999 I'd be reluctant to buy a used part.
Before I cough up $245+installation for a new one I'd like to be sure it is what I need to cure my emission problems (idling).
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Friday, August 7th, 2009 AT 3:44 PM
Tiny
LEONAIZ
  • MEMBER
Just thought you'd like to know that after further research (www. Repairpal. Com) I discovered the recall in 2002 for MAF sensor on my vehicle. I double checked on www. Epa. Gov/ltaq/recall. Htm and it was confirmed. I called a local dealer and he punched in my vin# and said that it did not show any active/or closed campaigns on my vehicle. The reason that it did not come up I suspect is that my vehicle was originally meant for the Canadian market. I had a lot of problems getting an emission label (needed for smog to be performed). I had to write to the mfg for a letter of compliance and go to a smog referee to have it applied inside my door jam. I am the second owner and would not have gotten notification of this recall. I hope that I am able to have it fixed under this recall, but I have to hear from Subaru/Canada. Thought you might like this info to pass onto others having the same problem. I cannot believe all the problems I have encountered in trying to correct an emission problem and not lose all the money I have tied up in this car ($4800) by being labeled as a gross polluter and having to retire it to the junk pile and the state being so kind as to give me $1000 (how generous of them).
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Friday, August 7th, 2009 AT 6:58 PM
Tiny
KHLOW2008
  • EXPERT
Thank you for the input.

It is much appreciated and would be helpful to others who might face the same problem.

Thank you once again.
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Wednesday, August 19th, 2009 AT 9:31 AM

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