1989 GT 5.0 Start up and Idle concerns

975 Views 4 Replies 3 Participants Last post by TKC, Aug 16, 2012

Caudill15

Discussion Starter · Aug 15, 2012 (Edited)

hey everyone, i just picked up a 1989 Mustang GT 5.0 automatic a couple weeks ago (all stock besides spectre air filter) and im having an issue with startup. whenever i turn the key over the engine will start but if i dont give it any gas, it will just die on me. it also likes to die on me when i am idling at a stoplight and try to take off. i also feel like my engine isnt producing the ammount of power that it should be when i mash the pedel to the floor. i think it may have something to do with the air to fuel ratio but i am not sure of this. does anyone know what may be the problem?

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· #2 · Aug 15, 2012

Welcome to AFM! I moved this here to the 5.0 Tech section to get you some input. The gurus here can help you out.

Thanks for joining!
:bigthumbsup

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Gearbox94

· #3 · Aug 15, 2012

Check for codes firstly and see what the computer thinks of the air/fuel it will tell you if its lean or rich. Next take the IAC valve off and try cleaning it and stick it bad on its on the throttle body. After that take the MAF off and clean it and the little filimint with MAF only cleaner.. this usually helps ALOT in pick up and throttle response. The filament gets dirty and sends a faulty reading to the computer.

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Caudill15

Discussion Starter · #4 · Aug 16, 2012

Thanks alot for the help!

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TKC

· #5 · Aug 16, 2012

Check timing and make sure all spark-relative components are new and or functioning properly. I.E. plugs,cap,rotor,wires. Verify timing,TPS voltage,clean salt n pepper connections,do a base idle reset and see if anything changes.

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