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1995 WRX Auto Rough Idle
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Old 27 Jun 2009, 11:29 PM   #1 (permalink)
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1995 WRX Auto Rough Idle

I recently changed the plugs in 1995 WRX Auto. I was sufferring an intermittant misfire when put in D and foot left on brake. Every 10-15 seconds the engine would misfire once ... a single occurence ...

I changed the plugs and checked the ignition coils for deterioration and all seemed fine. I replaced plugs like for like and now i am getting a double misfire in the same period.

When put in D and pull away, i now suffer a little starvation (misfiring) which i never did before. Old plugs were platinum PFR6B and i replaced with the same.

I cannot understand why i now get this rougher idle when sat in D not moving - nor why it stutters when pulling away. Once off the mark, it flies and never misses a beat!? The initial misfire was never there before - can anyone offer any pointers?

I have never seen the engine light come on at all during this time. The engine has 47,000 miles on the clock. I love this car (even though its auto!) and would love to get it back as was if not better. Please help!
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Old 28 Jun 2009, 04:41 PM   #2 (permalink)
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Re: 1995 WRX Auto Rough Idle

Are the gaps ok in plugs????Could clean your maf sensor with a cotton bud and carb cleaner gently as they sensitive devices see if that cures it if it does but not 100% but it feels better get a new maf sensor
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Old 04 Jul 2009, 01:40 AM   #3 (permalink)
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Re: 1995 WRX Auto Rough Idle

Thanks for your suggestions ... a question to you all ... do you always hear the petrol tank depressurise when you remove the fuel cap?? Could this be a source of rough idle at low rpm and load on the auto gearbox?
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Old 04 Jul 2009, 02:07 AM   #4 (permalink)
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Re: 1995 WRX Auto Rough Idle

Quote:
Originally Posted by jchard View Post
Thanks for your suggestions ... a question to you all ... do you always hear the petrol tank depressurise when you remove the fuel cap?? Could this be a source of rough idle at low rpm and load on the auto gearbox?
Happens in nearly all cars bud especially if you went for a fairly fast spin and then went to get petrol when you open cap you can hear it more then
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Old 04 Jul 2009, 08:33 AM   #5 (permalink)
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Re: 1995 WRX Auto Rough Idle

Just a thought .. if you all get it then no worries ... ive never noticed it to be so prominent on my other cars ... this one ALWAYS does it.
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