Question about 1986 Ford Mustang

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Ford Mustang missing upon hitting throttle

I have a 1986 Ford Mustang with the 5.0 HO 302, when i hit the gas it misses, or hesitates, and will then throttle up. I replaced the throttle positioning sensor and it still acts the same. Any suggestions?

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It could be either of the pcv valves, it could also be the o2 senser on the exaust

Posted on Apr 12, 2009

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I have a 1986 f150 with a fuel injected 302. it starts fine, likes to warm up before you shift into gear ( automatic trans). the problem is when you start driving at about 15 mph and make a sharp turn or...


I will try to suggest a few things but you have a lot going on there. First, the missing exhaust sensor can play havoc on the fuel mixture set by the computer.

Second, the sharp turn (In either direction?) can cause the fuel to move from the rear of the tank to the side of the tank unless the tank is full. You have to think about whether this problem is at a low fuel level or not. You can be having starvation issues at these times Or some models have a sensor on the Power steering pump to increase RPM to compensate for steering drag so the truck won't stall at low rpm with high steering demands. Like backing up a trailer.

Third, the loss of power and studdering upon impact, Need some clarity here. Do not know if you mean your truck will continue to run poorly unless you shut the key off and restart or since it has passed the impact it can straighten out on its own and you think its because of turning the Ignition key.

Try new Ignition key for the impact cutoffs.

For awhile some gas stations used filters on their pumps which contained styrofoam miniballs. When the gas stations filters ripped and broke apart the styrofoam miniballs were released and found their way into the fueltanks of a lot of customers. When the fuelpump is shut off, any debris can float away from the fuelpump pickup.

Loose connections, take a plastic or wooden mallet and hit around electric connections that can bounce while the motor is running. Check for corrosion on connectors.

Ask your autoparts store about relays for the fuelpump and computer control relays, check their plugins for corrosion.

I hope I have helped you and would like to know what you found.

Dec 05, 2010 | 1986 Ford F150 SuperCab

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Car starts fine and seems to idle normal with only a small "hitch" or "bounce" in the tachometer every once in a while, meaning the rpm's dip slightly and only for a split second. This happens maybe 15...


Check your fuel pressure regulator, just pull the vacuum line off of it and see if it is leaking fuel, it is found on the fuel rail, will be the only vacuum line on the fuel rail.

Oct 23, 2010 | 1994 Ford Mustang

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1988 ford f150 302: heavy hesitation.


Check engine light? Have you checked fuel pressure?

Apr 06, 2010 | 1988 Ford F 150

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89 ford f150 in-line 6 cylinder. i have replaced a few injectors both fuel pumps and filter. idles like a dream. when i hit the gas it studders but doesn't die. need more info ask. any ideas?


This is for a 1989 Ford F150 In-Line 6-Cylinder (4.9L) wrongly posted by the Asker under a 1986 Ford Mustang....

Fuel Injector Pressure Regulator. Look it up on line at any of the reputable auto parts websites to get an idea what it looks like.
There should be a Rubber Vacuum Line coming from this (the Regulator is located on the Fuel Line prior to the Fuel Injectors) to the Intake. Take this Line OFF. If there is gas in that line = The Fuel Injector Pressure Regulator diaphram is broken and the Fuel is being dumped into the Intake and NOT being advanced onto the Fuel Injectors; and the Regulator must be replaced.
Let me know if this helped.

Apr 01, 2010 | 1986 Ford Mustang

1 Answer

I just replaced my timing chain on my 302 but when I put it all back together it wont turn over like the motor is locked up and you cant turn the crank by hand??? Did I miss something


Sounds like engine is out of time and pistons are hitting valves locking engine up especially if it turned over and ran before you took it apart this is most likely cause. Remove timeing cover and verify timing marks are properly lined up on gears, then roll engine by hand, if it does not turn then it is hydro locked(fluid in cylinders with valves closed) or mechically locked(dropped a foriegn object into cylinders or bearings/pistons seized). good luck, if out of time you could have bent valves. Need to remove heads and verify if engine has a miss when you get it running.

Mar 01, 2010 | 1989 Ford Mustang

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Horn fuse location for 1986 mustang


Look in the owners manual or the underside of the fuse panel cover.

Jun 21, 2009 | 1986 Ford Mustang

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