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 1993 FX GT Corolla

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kalee
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PostSubject: 1993 FX GT Corolla   Thu Jan 10, 2013 7:06 am

Hi,Can anyone help?our GT has started missing and running rich,It does it randomly and the check light comes on then it comes right. it starts missing at about 4k. if we stop it and then turn the key back on you can see the check light is dim.Also when its missing the rev counter drops away intermittently almost like its an electrical fault.Any clues???? Thanks.
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PostSubject: Re: 1993 FX GT Corolla   Thu Jan 10, 2013 8:52 am

Ah man. Unfortunately there's quite a bit of things that can cause this. Trying working from the cheapest solutions up to the most expensive. Bad spark plug wires, spark plugs, distributor, cap, bad/leaky fuel injector, Upstream O2 sensor.

But first you should run a scanner to actually know what the code is.

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PostSubject: Re: 1993 FX GT Corolla   Thu Jan 10, 2013 9:59 am

Thank you,Thats where the problems lie,No codes come up! it resets itself and light goes out. Got a lot of people beat.
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PostSubject: Re: 1993 FX GT Corolla   Thu Jan 10, 2013 10:57 am

maybe a bad earth somewhere?
knock sensor?
dizzy?
cam timing been knocked out retarted or advanced?
lambda sensor?
coolant temp sensor?
maf sensor?

which way have to tried to get the error codes? through the diagnostic port?

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PostSubject: Re: 1993 FX GT Corolla   Thu Jan 10, 2013 10:59 am

If it does that, the code probably turned into a pending code. The check engine light does not have to be on for your car to store codes.

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PostSubject: Re: 1993 FX GT Corolla   Thu Jan 10, 2013 11:03 am

you can reset it by taking the negative terminal off the battery for about 30 mins, this resets the ecu..

start it up again, leave it running for 30 mins then turn it off, then turn it back on then check error codes

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PostSubject: Re: 1993 FX GT Corolla   Fri Jan 11, 2013 2:48 pm

Thanks for your help people<it is not storing codes thats the problem,we are going to try another ECU and see what happens.
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PostSubject: Re: 1993 FX GT Corolla   Fri Jan 11, 2013 4:38 pm

sounds like blown caps in the ecu.

same thing happened to mine. thats probably why i got it for $500. replaced leaky caps, cost me about $4. runs mint now.

oh and to reset ecu, its quicker to pull the EFI fuse for 5 seconds.
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