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07/20/2007 07:13:57 PM · #1 |
My jeep is having a very difficult time right now and I was hoping someone here could point me in the right direction.
On Monday morning I went to work very early (think, before the sun comes up) when it was nice an cool. I left work at 2:00, which means about 116 here in Phoenix. My jeep would not start. It cranked over, but did not even attempt to start.
That evening when my DBF came home (7:30 ish, much cooler) he drove me back to the Jeep and it started with no problem.
Repeat every day this week. I drive my Jeep to work with no problem, after work it will not start and I take the bus home. Mysteriously by 8:00 or so it will start and I bring it home.
What could the possible problem(s) be? What should DBF look at first? Right now he says either something fuel related or electrical. Pretty broad spectrum.
Thanks guys!
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07/20/2007 07:20:24 PM · #2 |
Its a TDC (Top Dead Center) Sensor. I'm guessing you have a Cherokee right? You can get them at O'Reillys for about 60 bucks and its pretty easy to change.
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07/20/2007 07:21:20 PM · #3 |
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07/20/2007 07:24:29 PM · #4 |
| Hmmm, not familiar with the jeeps. You said it cranks just fine, but it does not start. When hot, sometimes a starter solenoid will lock up, but if it's cranking, then it's not that. I would check the TDC Sensor like CalamitysMaster00 suggested. Good luck. |
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07/20/2007 07:35:31 PM · #5 |
I've had Jeeps, HAVE a Jeep actually, though it's a Grand Cherokee this time. I agree, check the TDC sensor.
R.
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07/20/2007 07:36:55 PM · #6 |
Before throwing parts at it, need to check to see if it has spark. This can be easily done with 2 people, one person inside the car, one under the hood. Not sure what year you have, but I'm guessing it has the straight-6 4.0L engine as most Jeeps have. Pull the coil wire off the distributor cap and stick it somewhere so the center connector is near (1/4" away or so) from a ground, like a metal bracket, a bolt, etc, and placed in such a way that the person under the hood does not have to hold it. Have the other person crank the engine over, while watching the end of the coil wire to see if it has spark. If it has spark, put the coil wire back on the cap, and repeat the same procedure using the spark plug side of any spark plug wire (most easily done by sticking a screwdriver into the end of the spark plug boot and placing the screwdriver shank/metal near a ground point, again 1/4" or so away). This will test coil output to the cap, and coil output from the coil, through the cap, through the rotor and out the spark plug wire.
Common crank & no-start problems on the Jeeps are in-tank fuel pumps going bad, TDC sensors as mentioned earlier, ASD relays (in the underhood relay box), igintion coils and distributor rotors.
Message edited by author 2007-07-20 19:38:13.
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07/20/2007 07:41:36 PM · #7 |
| Check the thingamajig and do the hokie pokie three times around the jeep :) |
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07/22/2007 05:08:07 PM · #8 |
Update: My DBF changed the Crank Position Sensor and the Jeep started right up. I drove it to work this morning, and when I left work it started right up. 2 more days and I will feel assured that the problem is fixed.
Thanks for the advice everyone. I love DPC just for this reason. What an outstanding community we have here. |
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07/22/2007 05:12:47 PM · #9 |
When in doubt hit it with a Birmingham Spanner...
A hammer, works everytime, almost! |
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07/22/2007 05:47:03 PM · #10 |
With temps of 116F it could be vapor lock.
The Army has a hell of a time with that on their ATV's in Iraq |
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07/29/2007 12:01:42 PM · #11 |
I have a question, Is the TDC sensor and the Crank sensor the same? It appears both names are used interchangable like you are talking about the same thing. I have a 93 Jeep Cherokee that won't start. It isn't getting any spark. It will turn over but not start. My husband changed the Crank sensor but still not working. He has also put in new plugs, distributor, rotor and fuel injectors. It did run after the fuel injector replacements but now it's not starting again.
Thanks, |
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07/29/2007 01:29:56 PM · #12 |
With DIS and multi-point EFI there was a sensor put on vehicles to tell teh computer when cylinder #1 was at TDC (top dead center). This told the computer the timing needed for spark and what cylinder to shoot gas into.
Some engines have it on the crankshaft (usually the flywheel/transmission end) but some put it on the front of the motor on the camshaft gear (the newer designs mostly). I've seen some with both.
If it was the sensor then the engine should not have started hot either - like if you stopped for gas or lunch or whatnot. Electrical components often fail when hot -they expand and lost contact inside. Cool down and contact is made again.
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