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Re: Jeep won't start
What generally happens with jeeps. is the idle air control valve loses memory of its idle position. try starting the vehicle with your foot slightly on the gas pedal. if it starts your going to have to keep it running by keeping your foot on the gas until it relearns its position and runs by itself. also there is a possibility that one of the modules locked up. if my first suggestion doesnt work then disconnect the negative batt cable for 30 seconds reconnect and then try to start it
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Need to check spark and fuel start by picking up a tester for the wires it plugs in like a spark plug and has a light that will come on if you have spark the next disconnect the main fuel line to the fuel rail and turn the key to the on position if u get fuel out of it the the pump is good
Your Jeep has what's known as the delayed start, no check engine light problem. The Jeep will not start until the check engine light comes on, on the dashboard. Next time it cranks but will not start, look at the dashboard to see if the check engine light is illuminated. If it's not lit up, then your Jeep does have that problem and your Jeep ecu is in need of repair or replacement. There are components inside the ecu that are going bad and will continue to get worse, eventually leading to a permanent no start condition. There are ecu repair services and replacement ecus on ebay.
Jiggle the wire connectors going in to the computer under the hood -- first check battery cables/terminal connections at battery -- beleive it or not, connection could SEEM good because you get crank & lights, but if it's faulty, loose, engine won't start - computer requires good solid voltage flow.. next check a fusible link very close to the battery off of the positive cable. check fusible link carefully. this could cause your problem for sure.
Not much to go on. Try replacing the start relay with another one in the fuse box. Thats if it won't crank. If it cranks need to see if you are getting fuel look down the TB carburetor looking thing on top of engine with key on and someone cranking engine. Put one of those testers in line with the spark plug wire it has a light inside that flashes when the engine fires. Or you could disconnect sparkplug end and hold on but it will knock you on your *** and could KILL you so don't do it
Check to see if the fuel pump is running after it shuts down...could be a relay or the pump itself (overheating internally) Checked the fuel filter yet? Some crank sensors need to be shimmed. If it's too close to the flywheel even though you recently changed it, if it's too close to the wheel it can fail again. May not be the case but worth checking over. Also check the ceramic resistor on the left fender near the master cylinder if you have one. That too can cause problems.
Sounds like it could be the crank sensor. This sensor relays engine crankshaft position to the computer so it knows which spark plug to fire when as well as other info. Another common problem with a Jeep is the throttle position sensor. This usually doesn't prevent the vehicle from starting but its not impossible either.