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It Randomly Dies!!!, 97 1500 4x4 5.9

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Old May 30, 2016 | 01:26 PM
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Default It Randomly Dies,Now it's Dead!!! 97 1500 4x4 5.9

In my ongoing saga of problems, something new started yesterday.

At first I thought my transmission was slipping as it seemed to lose power and then kinda slammed back in gear. This was in stop and go traffic, under 5 mph. About another 10 miles down the road felt like it was slipping again, intermittent "sputter" so I pulled off to check transmission fluids.

While I was parked at idle in neutral it just died. ??
Started right back up, so checked trans fluid. Was a little low but still on the stick. Needed to hopefully get home so took off.

Another 15 miles later in freeway traffic ~50 mph, on deceleration coast in 4th or OD, engine stalled. Pulled to shoulder and immediately restarted. Made it the last 5 miles home without issue.

No CEL. Haven't looked for any codes yet.

Before this issue a fair bit has changed but these are the first issues with drivability in ~300 miles. Recent changes:
  1. Changed speedo gear from 30 tooth to 34 tooth, tire/gear correction. (300 miles ago)
  2. Installed remanufactured transmission with torque converter. (600 miles ago)
  3. Replaced PCM/ECM to fix a "no start" condition right after the shop installed the transmission. (600 miles ago).
Not sure what to check for or diagnostics to run so any suggestions are appreciated. Thanks!
 

Last edited by 4STFire; Jun 1, 2016 at 12:30 AM.
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Old May 30, 2016 | 02:11 PM
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Doesn't really sound like an IAC problem..... Maybe a failing cam or cranks sensor......
 
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Old May 30, 2016 | 02:57 PM
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Originally Posted by HeyYou
Doesn't really sound like an IAC problem..... Maybe a failing cam or cranks sensor......
You mean cam sensor or the cam itself? Duhh, Checked the SM. I think you meant sensors for both.Thx.
 

Last edited by 4STFire; May 30, 2016 at 03:15 PM.
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Old May 30, 2016 | 02:59 PM
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Originally Posted by 4STFire
You mean cam sensor or the cam itself?
Sensor.
 
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Old May 30, 2016 | 03:16 PM
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Originally Posted by HeyYou
Sensor.
LOL, just edited mylast post as I figured that out after looking at SM. Duhh.

Wold there likely be any codes in memory for this or would a different OBD scanner tell me more than a simple code reader?
 
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Old May 30, 2016 | 03:40 PM
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It's a tossup. They have so many different failure modes, most of which, the PCM doesn't have a clue about. If you can check pending codes, that *might* be enlightening..... trouble is, it's the same code for both/either sensor.....
 
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Old May 30, 2016 | 08:20 PM
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Ok. Pending code is p0351. Now gotta research that.

FWIW, I have recently had a P0441 code. Started right after having had to move the fuel tank a little to install new leaf springs. Haven't checked any of the hoses or fill next hose for any looseness or cracks. Didn't think it related but thought worth mentioning.
 
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Old May 30, 2016 | 09:48 PM
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P0351 Ignition Coil # 1 Primary Circ

Losing power to the coil, or, failing coil.
 
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Old May 31, 2016 | 02:09 AM
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Originally Posted by HeyYou
P0351 Ignition Coil # 1 Primary Circ

Losing power to the coil, or, failing coil.
Sweet, swapping the coil is an easy step one. Last coil went on in 03, from AutoZone so it's under lifetime warranty. If the coil replacement doesn't cover it I guess PCM diagnostics is next?

I did try wiggling all the connectors on the PCM to try and duplicate the failure, but couldn't get it to fail.
 
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Old May 31, 2016 | 09:10 AM
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Coil gets power from the ASD relay, so, simply swapping that one, with the horn relay, will test to see if it's just a power issue.
 
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