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#12704 - 10/28/06 08:10 PM 2000 Chevy Prizm
rickmolen
Junior Member


Registered: 10/28/06
Posts: 1

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Got Codes P0171 and P0300. I have changed the spark plugs and cleaned the MAF sensor. I have also cleaned the throttle body. The car has 120,000 miles on it. I have put fuel injetor cleaner in it numerous times. Are there any suggestions to clear these codes ?
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#15876 - 07/01/09 06:19 PM Re: 2000 Chevy Prizm [Re: rickmolen]
xfi_fan
Junior Member


Registered: 07/01/09
Posts: 3

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I have a 2001 Chevy Prizm with 1.8 and 4 speed automatic.

I continually get the P0300 and P0304 codes. I replaced the MAP sensor, installed new iridium plugs, ran through many tanks of gas with fuel injector clearer, shot all kinds of carb cleaner through the throttle body, checked resistance on all 4 injectors, installed a new coil in #4, etc.

Then I purchased a new coil for #4 and that did not fix it. I then switched the coils around and I still get the 0304, never 0303 or 0302 or 0301. So I am pretty sure the coil is not the problem.

And, of course, I have cleared the error code in one of three ways each time; disconnecting the negative battery cable, had the guy reading the code delete it, and removing the appropriate (efi?) fuse under the hood. All to no avail. I always get the error codes back.

And I have had this problem for 65,000 miles. Just cannot get rid of it. No matter what I have tried!

The odd thing is the car runs really well.

I sure hope someone has some new ideas for me.

Thanks,
Chuck


Edited by xfi_fan (07/01/09 06:38 PM)

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#15878 - 07/01/09 10:36 PM Re: 2000 Chevy Prizm [Re: xfi_fan]
kozloski
Member


Registered: 11/25/03
Posts: 835
Loc: Fairbanks, Alaska

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Do you just get the codes or is the engine actually misfiring? If it's just the code you're getting I'd try a different EMU. It's not properly computing the timing between the tach pulses.
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#15879 - 07/02/09 07:07 PM Re: 2000 Chevy Prizm [Re: kozloski]
xfi_fan
Junior Member


Registered: 07/01/09
Posts: 3

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As far as I can tell it runs beautifully, so maybe I do need to replace the EMU. Guess I better starting looking for one in the salvage yards. - Only thing is, I have never heard of a Prizm/Toyota EMU going bad. Have you (or anyone else)?

Thanks,
Chuck


Edited by xfi_fan (07/02/09 07:08 PM)

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