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  #1  
Old 08-21-2013, 09:52 PM
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Newbei needs help please!

Hey y'all new to the site and I must say its awesome. I'm having a issue with my 1999 grand cherokee Laredo with 4.0 inline six. I'll be cruising down the road and the tach with drop all the way down and I lose power then it will die. I put it in neutral and it will start right back up and run fine. I don't lose any lights and they don't flicker so I don't think it's a ground. Anyone ever have this issue with their jeep? Any help would be greatly Appreciated. Thanks.
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Old 08-21-2013, 10:06 PM
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Re: Newbei needs help please!

Try the keydance and see if any fault code pops up: ignition switch off/on three times and leave in on at the third time. The odometer will show DONE when all ok, or a fault code. let us know what you find.
Could be the crank sensor, but also something else.
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Old 08-21-2013, 10:12 PM
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Ok I did what you said and three popped up. P0123, p0320, and p0121
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Old 08-21-2013, 10:26 PM
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Re: Newbei needs help please!

Ok, two codes are for the TPS (throttle position sensor): P0121 = TPS voltage does not agree with MAP signal.
P0123 = TPS voltage signal high
The third code P0320 = no crank speed signal received by PCM
Let me have a look what the most probable cause for this is.
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Old 08-21-2013, 10:36 PM
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Re: Newbei needs help please!

Seems that the P0121 and P0123 both are caused by a bad TPS.
The P0320 seems to be caused by the crank position sensor.
I would reset the codes first and then see which one (or all) comes back, to be sure what the problem is. But i bet that the crank position sensor is the problem and maybe the TPS a previous fault
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Old 08-21-2013, 10:42 PM
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Ok looks like I'm headed to auto zone tomorrow. Thanks so much for the info sir. Greatly appreciated!
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Old 08-21-2013, 10:53 PM
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Re: Newbei needs help please!

If it ever comes to change out the crank position sensor, our member JeepMe did a nice writeup on how to do it. Have a look here: How To: Replace Crankshaft Position Sensor
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Old 08-21-2013, 11:27 PM
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Thanks ill be changing it out tomorrow.
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Old 08-27-2013, 02:01 PM
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Well took me longer than I thought to change out the crank sensor but just got it done. Wow what a pain in the butt. Thanks again the the help!
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Old 08-27-2013, 10:28 PM
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Re: Newbei needs help please!

Ok, let us know after some testdriving if it has solved the problem.
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Old 08-28-2013, 11:06 AM
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I've got 75 miles on it since the sensor change and haven't had one issue that I was before. So I'm hoping it all good. I still have to get the throttle position sensor. That will be changed this weekend.
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Old 08-28-2013, 03:33 PM
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Re: Newbei needs help please!

Quote:
Originally Posted by jeepman465 View Post
I've got 75 miles on it since the sensor change and haven't had one issue that I was before. So I'm hoping it all good. I still have to get the throttle position sensor. That will be changed this weekend.
Did you reset the faults first to be sure that the TPS is still faulty? Could be an old code which was set once.
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