1998 Mercury Mountaineer wont start when warm

WISCONSINNER

MEMBER
1998 MERCURY MOUNTAINEER

Engine Mechanical problem
1998 Mercury Mountaineer 6 cyl Front Wheel Drive Automatic

the mountaineer starts fine in the winter but once the weather warms up it will only start the first attempt of the day, after that it turns over but will not start.I have taken it to a few mechanics and none could figure out whats wrong with it. Could there be water in the bottom of the gas tank that freezes in the winter and settles in the bottom of the tank during the night then mixes with the gas after its started when its warm. HELP!

1 Reply

RASMATAZ

MECHANIC
75,992 POSTS

Hi wisconsinner, Welcome to 2carpros and TY for the donation

it will only start the first attempt of the day, after that it turns over but will not start. Next time it refuses to start do below immediately to determine if its fuel or spark problem and get back with some results

Get a helper disconnect a sparkplug wire or 2 and ground it to the engine atleast 3/16 away from ground-have helper crank engine over-do you have a snapping blue spark? If so-you have a fuel related problem, check the fuel pressure to rule out the fuel filter/fuel pump/pressure regulator and listen to the injector/s are they pulsing or hook up a noid light. No snapping blue spark continue to troubleshoot the ignition system-power input to the coil/coil packs, coil's resistances, distributor pick-up coil, ignition control module, cam and crank sensors and computer Note: If it doesn't apply disregard it