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Old 09-27-2010, 09:40 PM
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1994 wrangler wont start- 2.5l

i have a 94 wrangler with a 2.5l 4cyl engine and it turns over but wont start and yes i have gas in it. i have replaced the coil and crank sensor, it randomly quit while i was driving home. the last time it did it i replaced a blown 30A fuse. the fuel pump kicks on the only problem is that there is no power to the coil. woiuld the cam sensor in the distrubuter be the problem or would it be something else. please help i need this to work asap so i can get to work!!! thank you-kyle

and also if anyone has any idea why it keeps spittin antifreeze out the overflow under normal temp and running conditions let me know
thank you

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Last edited by FirstOnRaceDay11; 09-27-2010 at 09:50 PM.
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Old 09-27-2010, 11:57 PM
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2 things cause a no start on those engines ( and the 4.0L's ). the crank sensor, and the camshaft position sensor.. the ignition will not spark until it senses 1 rotation from each sensor
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Old 09-28-2010, 06:13 PM
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ok

here's the deal now. i put an new cam sensor on it and nothing still. its not even trying to start still.
the other day when it stopped running i acted like it was a bad wire connection( now that i think about it) somewhere but i cant trace it down.
any clue on what i should be looking for?
keep in mind i have power to the fuel pump and the injectors just not the coil. and i tested both wires that go into the coil(+ and - side). neither gave me any indication of power from either side of the battery
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Old 09-28-2010, 06:21 PM
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The coil is fed off the ASD relay, the same as the fuel pump. It only sees pawer momentarily when the key is turned on, but will see power when cranking. Hook a test light up to the negative side of the coil, and put it to power, then crank the engine. You should see the test light pulse on-off-on-off. If it does not, then you are missing one or more of the inputs from the crank and cam sensors. It was fairly common on these 2.5's and the 4.0's in the jeeps to seize the distributor shaft in the dizzy housing, the result being a shattered drive gear(usually). this lead to no diszzy rotation, hence no spark. A quick and dirty look was to see if the dizzy had been dragged around a bit under the hold down clamp, as when the bushings seized it would rotate the distributor body clockwise a bit.

Forgot to mention, also check the timing belt as the intermediate shaft that drives the dizzy is driven off it. No belt, no rotation on the dizzy, no spark and no start. It is a non interferance engine, so if the belt broke/stripped, not a big deal.
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Old 09-28-2010, 06:32 PM
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hmm

still nothing no flicker at all

and what do you mean by inputs from the sensors? the computer is not telling me that theres a problem with them at all and i ran the codes just a little bit ago.
do you think theres a wire from one of the sensors no connecting with the computer?

and the dizzy is spinning

thank you all for the help by the way

Last edited by FirstOnRaceDay11; 09-28-2010 at 06:38 PM.
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Old 09-28-2010, 07:04 PM
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sbc chev freak is correct missing crank or cam sensor signal will cause no asd relay operation which will not run the pump or power the coil.you replaced both sensors and no go, so
Have you checked ALL the fuses. If they are all good then check for power at the ignition coil positive side while cranking (ASD ENERGIZED) if no go... there then check for reference voltage at the connector to both sensors the wire color is orange. It could be 5 volts or 8 volts.I dont recall specifically. Point is if you dont have a voltage on the orange wire then the pcm is not sending power to them and may the culprit. It is pretty common with jeeps and chryslers.I would like feedback on this piece of info the most,K
be sure that the fuses are good and have power with the key on.
Fuse F 1 in the power distribution center is the fuse that supplys the asd and the pcm with power.
like sbc freak said check for distributor rotation.this motor is timing chain driven not belt. But they both will break and fail to turn the distributor and cam shaft.
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Old 09-28-2010, 07:08 PM
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also spittin antifreeze could be a weak radiator cap.If you have replaced it and it still does the same thing then it could be a head gasket,or it is overheating and the temp gauge is reading wrong
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Old 09-28-2010, 09:54 PM
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You need to find someone with a scan tool that can see what signals are missing. You have replaced several thing you didnt need to already. The most common failure item on that engine is the crank sensor and it sounds like the only thing you havent replaced yet.
Please find someone with the proper tools to diagnose the issue. It probably would have been cheaper to pay someone to fix it then what you have spent on parts you didnt need.
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Old 09-29-2010, 06:44 PM
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ok just went out and tested it and no power on either orange wire to either sensor so now my question is what do i do to fix it? why is my pcm not giving them power?

oops and yess all fuses are good


Quote:
Originally Posted by latech
sbc chev freak is correct missing crank or cam sensor signal will cause no asd relay operation which will not run the pump or power the coil.you replaced both sensors and no go, so
Have you checked ALL the fuses. If they are all good then check for power at the ignition coil positive side while cranking (ASD ENERGIZED) if no go... there then check for reference voltage at the connector to both sensors the wire color is orange. It could be 5 volts or 8 volts.I dont recall specifically. Point is if you dont have a voltage on the orange wire then the pcm is not sending power to them and may the culprit. It is pretty common with jeeps and chryslers.I would like feedback on this piece of info the most,K
be sure that the fuses are good and have power with the key on.
Fuse F 1 in the power distribution center is the fuse that supplys the asd and the pcm with power.
like sbc freak said check for distributor rotation.this motor is timing chain driven not belt. But they both will break and fail to turn the distributor and cam shaft.
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Old 09-29-2010, 07:52 PM
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Quote:
Originally Posted by FirstOnRaceDay11
ok just went out and tested it and no power on either orange wire to either sensor so now my question is what do i do to fix it? why is my pcm not giving them power?

oops and yess all fuses are good
OK you will have to verify the power circuits to the pcm.Give me a few minutes and I'll post the colors and pin positions at the pcm.
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Old 09-29-2010, 08:02 PM
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On the plug for the pcm the pin in number 3 position should be Red with White stripe. It should be 12 volts all the time

Pin 9 should be yellow with white stripe and should have power with the key on
It has a fuse in the fuse box fuse number 5 it is 10 amp. I think it is in the fuse box under the dash not the one under the hood. Check both again to be sure.
If you have these 2 input voltages and the reference voltage you tested earlier is not there the the pcm puked.
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Old 09-29-2010, 08:10 PM
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[QUOTE=FirstOnRaceDay11] it randomly quit while i was driving home. the last time it did it i replaced a blown 30A fuse.

Which fuse was that by the way? was it the F 1 fuse in the underhood box?

( I am trying to determine the root cause)
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Old 09-29-2010, 08:14 PM
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yes it was. its the only 30A fuse in the box
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Old 09-29-2010, 08:40 PM
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The ignition coil could have shorted or leak a high voltage from the secondary and blown the fuse.I wouldnt be suprised if it took out the pcm the second time. I saw you put on an ignition coil so now you need to change the computer.The coil probably smoked your PCM
If you buy a remanufactured one keep this in mind. Cardone is the absolute worst POS there is. I would run a junk yard computer first.I have looked in at the boards on some of the PCMs that cardone peddles as Remanufactured and the work is shoddy ,about 50 percent fail within the first week.I have no axe to grind with them,they just sell junk

I would get one from napa or a junkyard if you have to.There are better alternatives to getting one remanufactured if one is not readily available.
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Old 09-29-2010, 08:47 PM
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ok the red wire with a white stripe has power but the yellow with white stripe does not and yes the key is on and i could not find a blown fuse
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