1990 - 5.0 L idle problem - Muscular Mustangs
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post #1 of 9 Old 08-02-2009, 10:51 PM Thread Starter
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1990 - 5.0 L idle problem

Hello all,

I own a 1990 - 5.0 L Mustang LS that has been in the garage for some time.
I had to recharge the battery as it was dead.

The problem i have now is that when i start the car :

1- engine stops unless i keep foot on gas pedal
2- when i press the gas pedal to keep it from stopping, it sounds like the intake is back firing when rpm arround 1000

Any toughts ?

Thanks.
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post #2 of 9 Old 08-05-2009, 01:11 PM
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Re: 1990 - 5.0 L idle problem

That really could be many things. The only thing to do is to start ruling out different things. How long have you let the car run for since recharging the battery? It's possible that the computer just hasn't relearned it's idle since the battery died.

Also try checking your computer codes as that may lead you in the right direction.
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post #3 of 9 Old 08-06-2009, 10:07 AM
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Re: 1990 - 5.0 L idle problem

I think you need to drive it up to 45 mph for the computer to reset the base idle. It also might be a vacuum leak.
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post #4 of 9 Old 08-06-2009, 10:25 AM Thread Starter
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Re: 1990 - 5.0 L idle problem

Yes, i let it run for about 10 minutes keeping my foot on the gas.
I get no codes from the computer at all.

Any documentation about all vaccum hoses i could check ?

Thanks guys.
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post #5 of 9 Old 08-06-2009, 08:01 PM Thread Starter
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Re: 1990 - 5.0 L idle problem

Bah....i got it....
TPS voltage was at .86....

After putting it at .99 and starting it, it started to adjust itself hehe...and i could hear it adjusting too...
After 20 minutes it was running like a baby...

Cool stuff...

Thanks guys.
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post #6 of 9 Old 08-06-2009, 08:15 PM
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Re: 1990 - 5.0 L idle problem

Awesome.
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post #7 of 9 Old 01-26-2014, 06:41 AM
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