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99 mustang will turn over but won't start what to do??

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First, check the basics. Do you have spark? Do you have fuel?

To check spark, pull a plug, and, with wire attached, try to start the engine. Do you see a spark at the end of the plug?

To check fuel, first turn the key from OFF to ON, but not START. You should be able to hear the fuel pump prime up for a second or two. (If not, try listening closer to the tank while someone else turns the key.) If it passes that test, crank it for several seconds then depress the schrader valve stem on your fuel rail (looks like the valve on your tires if you don't know). Do this quickly -- if there's fuel in the rail you'll get a shot of it once you depress that stem.

Those two quick tests will tell you where to start looking.

Posted on Mar 20, 2014

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Posted on Jan 02, 2017

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SOURCE: 99 mustang won't start it only do 1 click. If it

Battery good, cables good, all connections clean and tight, no corrosion on battery terminals?
Try to determine if click is from solenoid on the starter or starter relay. Turn the headlights on and watch them while someone turns the key to start. If they get dim, probably the starter-have it tested-even new ones are sometimes bad. If lights don't dim, you will need to check the start circuit. Check for power on the small wire to starter solenoid when key is held in start. If no power there, work back towards the ignition switch. Check the neutral safety switch-should have power in and power out when key held in crank. The ignition switch will have a start wire out of the switch going to the neutral safety switch. It should have power with key in start, the only time the start wire will have power.
Post back with what you find-good luck.

Posted on Sep 25, 2013

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