Question about 1991 Ford Mustang

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91 four cylinder ford mustang

The car wont pick up speed vary fast and its doggy also it always wants to quit running

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  • holmanettie Sep 24, 2008

    already did that recently

  • holmanettie Sep 25, 2008

    i did the fuel filter but i did not try the coil packs or the ignition module thanks

  • Nathan Scheef Oct 27, 2008

    i think i have the same problem here the car seems to be running on only half of it's power. rpm reads 500 at idle normal its about 1000 rpm. i have taken it to two places and although it is checking code they cant fix it please any ideas.

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  • 63 Answers

Whens the last time you had a tune up, plugs and wires could solve this problem.

Posted on Sep 24, 2008

  • anthony molina Sep 25, 2008

    did you do fuel filter, coil packs, ignition module

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My signal lights and brake lights on my 91' Ford mustang stopped working. Does anyone have a owners manual?


Try checking http://www.ffcars.com/forums/108-electrical/211187-helpful-electrical-drawings-schematics.html. You've checked your fuses already, correct? You can also pick up the correct Haynes or Chiltons manuals not only from your local Autozone or Pep Boys, but also many libraries carry these manuals as well.

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2001 mustang...6 cylinder. Car overheats at slow driving speeds with ac on. Temp goes to the H on temp guage, but not over redline but almost. Electric fan running. Ford dealer flushed radiator and changed...


Check that the water pump drive belt is tight
Check that the cylinder head is not blowing.
Check the impleor on the water pump is not eroded
Check theair flow through the radiator is ok.
Check electric cooling fans operates if fitted.
Are you driving in to low a gear?
Are the brakes draging?
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Check that the correct ignition time is ocurring at all engine speeds.

Best of luck Cliff UK

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I have a 2003 mustang cobra with the 4v dohc v8 supercharged. It idles perfectly. when i rev up the engine it sounds great, but when i take off and get into second and third gear it wont go past 4000...


Check the prongs on the #1 coil to see if it is crackd if it is left alone it will eventually turn to a multiple misfire, also take the coil off to make sure nothing is shorting out.

Jan 16, 2011 | 2003 Ford Mustang

1 Answer

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pump running half speed? check for bad ground and yes you need an OBD 1 scanner,need more help get back to me as i strive to be the best. Please rate my fix? Thanks Ray

Dec 10, 2009 | 1995 Nissan Pickup

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Power to fuel pump on 91 ford mustang cobra 5.0


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Sep 30, 2009 | 1991 Ford Mustang

2 Answers

I have a 1998 ford mustang 5 speed. the theft light keeps blinking and it wont start. can you help me


The theft light blinking fast because there is a problem with the PATS ,(passive antitheft system). You either have a bad chip in one of your keys,PATS transceiver on ignition cylinder or computer. If it is a key you would have to have them programmed into system which requires you to have 2 keys and certain diagnostic equipment to program them into sytem. I would take it to your service provider or someone who has the equipment to do this like a ford or lincoln, mercury dealer.Have a good one!

Jul 11, 2009 | 1998 Ford Mustang

1 Answer

68 ford mustang


Hi there!

This isn't going to be good news Im afraid. These symptoms are typical of head gasket failure.

Head gaskets can fail on one of 3 ways -
#1 Rupture to outside from cylinder - Lots of oil, steam, fire maybe - it's pretty obvious.
#2 Rupture from cylinder into an oilway - You burn lots of oil, blue smoke, lack of power, oil forced out of fillercap, dipstick, air filter gets black.
#3 Rupture from cylinder into coolant channel. You use water - but no leaks under car. White steamy exhaust on starting, Coolant overheats quickly and appears to boil. Inspection of coolant is sometimes oily.

Yours sounds like #3

It probably needs the cylinder head off and the gasket replaced. Quite a time consuming job, but DIY-able with the correct tools.

You can check the compression of the cylinders first just to make sure it is this and not leaks somewhere else -

Check out PetesPonies post on the mustang forum about leaks around the intake manifold. It may be easier to check this first.

Thanks for using Fixya! If it solves your problem, please rate as such. Thank you.

Jul 03, 2008 | 1966 Ford Mustang

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