which sensor keeps your car from starting? - Jeep Cherokee Forum
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which sensor keeps your car from starting?

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Old 12-19-2010, 04:19 PM   #1
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Question which sensor keeps your car from starting?

WHAT HAPPENED? I was going 35. I pressed on the gas. No raise of rpms. I got a backfire. it kept idling so i slowly made my way to the side of the road. I immediately shut it off. And then tried restarting it, and now it just cranks and cranks. and no fire

MY TIMING WORKS. i have spark (bright blue snap) i Have fuel pressure, I have Fuel. i have compression. The pump buzzes and primes. When i get it timed right like 1 cylinder will fire. Then it will stop and keep cranking. I once got all the cylinders to fire and it didnt stay running.

THINGS IVE REPLACED: the crankshaft sensor, the distributor, the distributor cap, The spark plugs, the coil, my alternator, the cam shaft sensor, and i cleaned out my throttle body.

THINGS I NEED TO KNOW. What sensor keeps a car from starting? How do i check the injector pulse? And what could cause this?
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Old 12-19-2010, 04:40 PM   #2
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Didn't you already say your computer was bad?
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Old 12-19-2010, 04:50 PM   #3
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uhmmmmm no my car got in a giant puddle stayed running and i fried the voltage regulator so now i have one externally wired in. Before my car shut off i was going through puddles feet deep .......do u think my computer took a crap?
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Old 12-19-2010, 04:51 PM   #4
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If you have fuel, spark and compression it will start. Ignition Switch and ASD Relay. You might as well change the MAP Sensor I think you missed that one last time. Have you checked your fuses? Is there gas in your tank?
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Old 12-19-2010, 04:54 PM   #5
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Almost forgot Knock Sensor and Coolant Temperature Sensor.
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Old 12-19-2010, 04:56 PM   #6
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Old 12-19-2010, 05:03 PM   #7
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If you have fuel, spark and compression it will start. Ignition Switch and ASD Relay. You might as well change the MAP Sensor I think you missed that one last time. Have you checked your fuses? Is there gas in your tank?

i swapped the asd. the ignition switch has been replaced i have quarter tank..........the map is fine.....sooooo my guess is bad ecu. is thee ecu easy to swap?
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Old 12-19-2010, 07:34 PM   #8
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just got a new map sensor, IAC, tps, and computer hopefully it will work now!!!!!!!!wish me luck!
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Old 12-19-2010, 07:42 PM   #9
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if you get a new motor im sure it will start
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Old 12-19-2010, 07:43 PM   #10
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If you had somebody working on it who knew what they were doing I am sure it would start.

Edit: You never answered when I asked what Compressed Valves were.
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Old 12-19-2010, 07:49 PM   #11
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it kinda started just fired on a couple cylinders
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Old 12-19-2010, 07:50 PM   #12
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if you get a new motor im sure it will start

hahahah its on my christmas list!!!
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Old 12-19-2010, 07:51 PM   #13
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hahahah its on my christmas list!!!
What are compressed valves?
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Old 12-19-2010, 08:09 PM   #14
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idk the guy i bought it from said it has something like that i have no clue like shaved heads or pistons or something....no clue!
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Old 12-19-2010, 08:22 PM   #15
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i will grab a new ballast resistor tommorow!
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