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1990 Ford Bronco Question: starting issues popping from intake

 

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ford bronco XLT, 5.8L V8, Jefferson, NC, January 06, 2011, 20:22
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 Enthusiast

the year if my truck is not available but is the same as a 90 model, this thing has been giving me a fit for more then 2 1/2+ years, when i crank it, it runs fine for about 5 seconds or so, ides up to 2500 rpms then it trys to die, feather the gas (wave the peadal) it starts to run rough, then as im giving it gas it pop's out the intake "so sever it blows the air box lid off, and i can keep it running like that for a brief time then it dies, and will strart back up and do it all over again, runs really rich, fuel pump works fine, timing seems right, it just seems like it not getting enough air, i wrecked the week before this happend, but did no visual damage to my truck, but the mini van i hit was 6 or 7 thousand dollars of damage, i have put a tune up on it, plug's, wire's ,cap etc..., checked fuel pump kicks on as usall, i replaced the tps (throttle postition senser) and fixing to clean IAC and the throttle body in best hopes, but it back fired really bad one and only one time right befor this happend and it started going down hill slowly for a bout a week after and now wont run at all, please any help is greatly apprecaiated,

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  • Answer #1

    mastertech6371 January 06, 2011, 20:32
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     Master

    idle air cannot be cleaned. replace it. it may be bad and making it run so lean that itis backfiring.
    the throttle body may have to be cleaned and adjusted. the idle should be 500 rpm with the iac disconnected.
    orherwise it sounds like a bad vaccuum leak that is causing your issues.
    do the basics first.

    Roy

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  • Answer #2

    Brian Glastetter January 06, 2011, 20:43
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     Master

    Another known concern that could cause this is cross-firing plug wires. There is a way that spark can be induced into another wire firing an adjacent cylinder causing a back-fire. Make sure that all plug wires are in the separators and routed correctly. I hope this helps.

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