Question about 1986 Ford Mustang

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1986 ford Mustang 5.0 engine is idling to high. How do I turn it down a bit?

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Its likely you have a vacuumk line cracked or broken , search under the hood , you mat have an idle set screw at the throttle
butterfly assembly , if your lucky.

Posted on Aug 27, 2010

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My Ford Mustang 2002 Idles high at start up. Why does it do that? It even idles high in gear when i am not pressing the gas and the idling is causing it to speed up more on its own when Im not pressing...


Hello and welcome to FixYa!

All EFI (electronic fuel injection) engines idles high during start ups. It serves like an auto choke to regulate the vacuum supply and most of all to lessen the wear and tear of the engine. Please drive the car only when it reaches the normal operating temp.

Hope this helps and thank you for using FixYa! Have a good one!

Apr 06, 2011 | 2002 Ford Mustang

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Hi, I have an 86 Mustang GT. At idle the engine dies unless I give it some gas and the revs go up and down. On the freeway the engine died and then came back a few times. She runs strong but I do not...


It could be your idle air bypass valve. They get sticky with age and don't let enough air around the throttle body to keep the car running when it's at idle.

Jan 14, 2011 | 1986 Ford Mustang

1 Answer

My 1986 Mustang Gt starts up fine... sputters a little when i put it in reverse and when im driving it... it will sputter a little bit like a huff and puff.. does this sometimes when i'm idle.. but the car...


Plugs and wires are a good start, if they haven't been replaced for a while. I would change the fuel filter and check the air filter. The fuel filter is often overlooked. The ones I change, you wouldn't believe the dirt that's in them.

May 27, 2010 | 1986 Ford Mustang

2 Answers

We need the timing specs for and 86 2.3 ford mustang


Ignition timing should be set at 10 degrees BTDC (before top dead center), with vacuum advance hose disconnected and plugged, engine idling at 800 rpm or less.

Jan 10, 2010 | 1986 Ford Mustang

1 Answer

I have a 1986 ford mustang GT. i have tried putting the H-4 conversion lights from hella. when i put the head lights on, and turn them on it seems they are drawing to much power or something, because my...


when doing this conversion you are adding extra high power lights did it recomend changing your altenator to a higher amp alt. ? this is what you will most likely have to do

Nov 20, 2009 | 1986 Ford Mustang

1 Answer

1986 Mustang LX 4 cycl won't idle.


check all of the vaccum lines and the one behind the throttle body and the EGR valve and the vaccum pump.

Feb 08, 2009 | 1986 Ford Mustang

1 Answer

1967 Ford Mustang-- idle problem


If I had to fix this, I would use a tiered approach. You have several issues to deal with. 1st- is the engine timing correct (lets assume it is), try adjusting the choke (blackdial on the ffront of a single barrel, turn towards lean) this should bring down the idle. Turn it till it almost dies then turn in the opposite dirrection SLIGHTLY until it steadies out. The engine might shake more now (it did w/mine) so now you losen the 1/2 bolt that is behind the distribibutor. Now that the dis. is lose turn the whole diss. assembily slightly in either direction. One way will steady out the engine, this is adjusting the ignition timmiing. If all that works out you should be golden. Of course there is a lot of possible causes connecting rod length between the gas pedal & carb, vac. leak(through a vac. gauge on it, that will help finding wether or not there is a leak). if this doesnt work repost with results and a vacum reading. I'll check back

Oct 19, 2008 | 1966 Ford Mustang

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