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Thread: 5.0l mustang help

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    5.0l mustang help

    ok so my uncle has a problem with his mustang, he took the intake portion off for a cleaning and painting, and now when he got it back together something isnt right.

    he says its like the choke is staying on and when it warms up its running like crap...
    now its a 88 5.0l HO so its fuel injected, so im thinking it wouldnt have a choke, is this correct? would it be the throttle position sensor? or maybe an idle air control circuit?

    and help or advice would be great!
    If its a mechanical device i can fix it

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    sounds like a vacuum leak to me
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    ok i will pass that on, i guess its a good easy place to start...
    am i correct in my assumption that a fuel injected motor does not have a choke?

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    ^ A vaccuum leak is definitely a possibility considering the intake was just tinkered with. Also, Ford IAC motors are notorius for getting sticky. If it is stuck open, it will idle high. It is simple to remove, inspect and clean on that engine. I would unbolt the sensor and while plugged into the harness, turn the ignition on and see if it winds itself open at all. It might need cleaning or replacement.

    ---------- Post added at 10:15 AM ---------- Previous post was at 10:13 AM ----------

    Quote Originally Posted by markr1001 View Post
    ok i will pass that on, i guess its a good easy place to start...
    am i correct in my assumption that a fuel injected motor does not have a choke?
    It does not have a choke in that sense of the word like a carb...but it does have choking functions. The IAC regulates idle only air flow and with the addition of ECM programming that allows for cold engine fuel enrichment, the choking process occurs.
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    awesome! this is great, give him tons of stuff to check... any other thoughts definatly toss them up

    he said"Low idle is a little rough when first starting out and high end of 3rd feels like a miss but smells like it is running rich b/c the choke is on"

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    Well like posted above, there's no physical choke. The "running rich" statement is a little concerning because a vacuum leak should cause a lean run, not rich... although from the drivers seat he may just be mistaken.

    You can use carb cleaner to spray around the mating surfaces of the upper and lower intake. Spray the gasket seam and listen for a change in the idle speed or a studder in the RPM. You can use the same cleaner to clean out the IAC that CTD mentioned.
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    Check and make sure the pcv hose at the back of the lower intake in the middle is actually seated in the hole correctly and the screen in there is not plugged
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    my 87 had a rich condition, did he disconect the wireing harness, maybe forgot to plug in the o2 sensors..
    mine was a rewire job on a 52, the heated curcuit never got wired in, took to long for the o2's to start reading..
    Last edited by MJ4.0; 10-22-2010 at 12:20 AM. Reason: spelling...

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    My brother has a 5.0 in his jeep and was doing something very similar... ran good when first started (when it was cold), then when it warmed up it ran like crap... black smoke from the tail pipes and would hardly hold an idle, almost like the choke was stuck on (yes, I know, fuel injected). We changed alot of stuff on it (all sensors, painless wireing harness, fule regulator, computer) but through everything what it turned out ot be was a bad main coil. Once that was changed it ran like a dream. Just something else to look at.
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