96 Jeep GCL DOA - JeepForum.com
 
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post #1 of 12 Old 07-24-2021, 07:22 PM Thread Starter
allenalthor
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96 Jeep GCL DOA

1996 Jeep Grand Cherokee Laredo
New 318 and Tranny @ 310,000 Both running a little over 30,000 now
New Battery

I hope someone can help me with this. Driving home the other night I noticed my ZJ was running a little hot. I got into the parking area and parked. As soon as I got it into "Park", my waterpump gave out. My "Idiot Box" was telling me to check my gauges which I did. My battery was on zero... it's a new battery, and the cables were hooked up. Strange. I decided to put my scope on it and it blew the code for the Camshaft Positioning Sensor. Okay. So, first things first, I replaced the waterpump, Rotor, and clutch fan. When I got the waterpump off, I saw a crack in the lower right quadrant of my Timing Cover. Probably should have replaced it, but it was $250!! I ended up JB Welding it. That's what it's there for, right? LOL. Buttoned it up and it wouldn't start and sounded different while cranking. This is the point I connected my scanner and it was throwing the Camshaft Positioning Sensor Code. It said PCM not receiving data stream. So I replaced the distributor cap and rotor, cleaned up all the contacts (Plug wires, distributor posts, battery). I could not find the sensor in the parts stores, Amazon or EBay, so I cleaned it up as best I could and reapplied it. Crossed my fingers, but it still wouldn't start. I'm out of options and money. Normally I would think some of this is unrelated, coincidence maybe. But it all happened at once. HELP!! It's my only vehicle and I am handicapped. Has anyone run into this?

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post #2 of 12 Old 07-24-2021, 08:14 PM
PolkaPower
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Bad camshaft position sensor will cause a no run. I'm not trying to diagnose it here over the internet but that is a fact.


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post #3 of 12 Old 07-25-2021, 01:40 AM
riiz
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https://www.rockauto.com/en/moreinfo...=7176&jsn=1332

Sometimes the Camshaft sensor is listed at a distributor pickup coil.
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post #4 of 12 Old 07-25-2021, 06:47 AM
jtec
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allenalthor ARE you still working this - what have you done since your last post?

If you need help start by post ALL code #s your getting. Keep all parts.

When I see the price of OEM I think aftermarket.
When I see the quality of aftermarket I think OEM.
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post #5 of 12 Old 09-04-2021, 02:43 PM Thread Starter
allenalthor
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Update on 96 Jeep GCL DOA

I have since replaced the following:
  • Water Pump
  • Clutch Fan
  • Distributor Cap
  • Cam Positioning Sensor
  • Rotor
  • Spark Plugs
  • Plug Wires
  • Coil

It still will not start.
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post #6 of 12 Old 09-04-2021, 02:44 PM Thread Starter
allenalthor
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Yep. Found that out thanks. Replaced it but it still doesn't start.
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post #7 of 12 Old 09-04-2021, 02:59 PM
jtec
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OK lets regroup.
Started working JULY 24th, do they call you lightening.

I enjoyed your post.
"My "Idiot Box" was telling me" IDIOT BOX? IDK your boyfriend.
" my scope on it and it blew the code " Scope maybe a code reader or scanner?
BLOW a code thats CODY your friend right?

What codes is the system showing Pxxxx? Tis is a 1996 correct?

Do you have spark at several plugs?
Are the injectors pulsing- a noid makes this easy. Try a test light on inj's.
What is fuel pressure - PSI?

Taking a SWAG I am thinking CKP. lack of spark and inj pulse will confirm. And the CODES ALL of them.

When I see the price of OEM I think aftermarket.
When I see the quality of aftermarket I think OEM.
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post #8 of 12 Old 09-04-2021, 06:05 PM Thread Starter
allenalthor
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UPdate GCL DOA

Mopar Self-Diagnostics show codes 12 and 55.

12: Indicates power between PCM and battery was interrupted

55: Indicates the end of the diagnostic cycle.

NO HELP THERE
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post #9 of 12 Old 09-04-2021, 06:15 PM Thread Starter
allenalthor
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My scanner registered the following:
PO340 (No Cam signal at PCM. No camshaft signal detected during engine cranking.)
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post #10 of 12 Old 09-04-2021, 09:56 PM
jtec
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read the info I posted above to check CKP. BEFORE discarding CMP. test is easy fast.

AGAIN
'Taking a SWAG I am thinking CKP. lack of spark and inj pulse will confirm.
Do you have spark at several plugs?
Are the injectors pulsing- a noid makes this easy. Try a test light on inj's.'

When I see the price of OEM I think aftermarket.
When I see the quality of aftermarket I think OEM.
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post #11 of 12 Old 09-05-2021, 06:10 AM
V8GCZJ
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With no cam or crank sensor input you will not get a spark. You said you replaced it, What brand is it?
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post #12 of 12 Old 09-05-2021, 01:57 PM
RedRiverT
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"I noticed my ZJ was running a little hot. I got into the parking area and parked. As soon as I got it into "Park", my waterpump gave out. My "Idiot Box" was telling me to check my gauges which I did. My battery was on zero... it's a new battery."

Explain exactly what you mean by "waterpump gave out".

I suspect you had a problem while you were driving, not simply as soon as you parked. That's why your battery was on zero, the alternator wasn't turning because the belt was off, or the water pump was locked up and was holding the belt so it was slipping on the crankshaft pulley, or the idler pulley or tensioner pulley was locked up.

Overheating can cause problems with other items.

Also, one time mine would not start 2 minutes after I had just shut it off, and I forget the reasoning behind my actions, but I put on a new alternator and it started right up. Maybe your alternator is bad. The reason your battery went to zero is probably because either the belt wasn't turning or the alternator was bad. It could possibly have burned up the bearing and locked up, which led to your overheating problem.
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