5.0L (1979-1995) Mustang Technical discussions on 5.0 Liter Mustangs within. This does not include the 5.0 from the 2011 Mustang GT. That information is in the 2005-1011 section.

Idle problem

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Old 11-22-2007, 10:53 AM
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wildsurfer92
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Default Idle problem

Okay so i just got finished installing a professional products egr plate and throttle body, both 70mm, and got everything all hooked up, and the car idles at like 600rpms, and if i get on it, and come to a stop, it will just die, any suggestions
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Old 11-22-2007, 11:05 AM
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92cobra
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Default RE: Idle problem

600rpms is a pretty low idle, could there possibly be a vac leak somewhere? Does the car die when you drive it regularly and then stop, or only if you get on it and stop. Anychance you can check the fuel pressure?

I dont know a lot, but im giving my 2 cents <3.
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Old 11-22-2007, 11:06 AM
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HACKGT350
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Default RE: Idle problem

did you upgrade your maf to go with that tb?
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Old 11-22-2007, 11:10 AM
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wildsurfer92
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Default RE: Idle problem

yea it should be somewhere around 900, no vacuum leaks, yea it dies pretty much either way i drive it..and fuel pressure is fine, just put on a walbro 255lph pump, and kirban afpr, and pressure is good...i have a feeling it is something not adjusted right with the new throttle body plate
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Old 11-22-2007, 11:10 AM
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Default RE: Idle problem

nope, no upgrade to the maf
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Old 11-22-2007, 11:15 AM
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HACKGT350
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Default RE: Idle problem

well that new tb is sucking in all that air and the maf is to small and not reading the right thing
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Old 11-22-2007, 11:19 AM
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wildsurfer92
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Default RE: Idle problem

i see, so what size maf should i go with? right now its stock. Is there anything else i can do besides getting a new maf, to solve the problem?
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Old 11-22-2007, 11:52 AM
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Default RE: Idle problem

Ryan, what is the TPS set at? It doesn't come preadjusted on that t/b? Also, you may need to set the base idle up (adjusting screw under the t/b)and then set the TPS. I ran my stock mass air for quite a while when I upgraded to the same t/b and plate you have. That shouldn't have anything to do with it. What intake are you running?
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Old 11-22-2007, 12:28 PM
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wildsurfer92
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Default RE: Idle problem

Hey Bernie, I have no idea what the tps is set at, or where to check it. and i tried to adjust the screw down there like the directions said...it has a t-15 screw in it, and it is coated with some yellow stuff? locktite? and when i tried to adjust it, i only managed to break my torx bit[:@]... i am still running the stock intake too
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Old 11-22-2007, 12:36 PM
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Default RE: Idle problem

Hmmmm, you shoulda waited in the upgrade. The stock inlet is quite a bit smaller on the intake. Not really gonna get much outa the new parts. I'm in Dela this weekend, otherwise I would help ya out. It's not that hard to adjust. There should be some links in our tech section on the sublect.
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