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24v nightmare

Mikelilly84
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Mikelilly84

Mikelilly84

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Hey guys new member here! Buckle up this is gonna be a long one. Lol I have a 99 3500 with a 6speed swap. Bought the truck not running from an auction. First thing I noticed when trying to get running was it had a lift pump in the tank that looked factory ran never seen that before. Got truck running by just replacing batteries. Install a fass 100. My issue is now truck runs and idles good but I have no tach , power loss , and extended crank sometimes and a crank sensor fault. Replace crank sensor 3 times no change. So my thought was tone ring so I pulled starter and sensor to try and inspect tone ring. Here’s where it gets weird. I don’t see a tone ring? All I see through the hole is the crank when it comes around and it take up almost the entire hole. It also is slightly rubbing the crank sensor. My thought is maybe an 01 block? My buddy has Cummins insight and the engine number on the front cover has a build date of 7-2000. Im at a loss of what to do next cause I know motor isn’t original and idk if it has the right ecm on it. And to top it all off is when I unplug the crank sensor truck will not start. What is it reading the crank counter weight lol I’m at a loss. What should I do next? Any help or insight would be greatly appreciated 

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Silverwolf2691

Silverwolf2691

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I think someone grabbed a 2001 model year truck and just popped the engine into your 1999. Not good to do that..

Only thing I don't know is when that transition happened for the engines. Because from the way it sounds the engine is the right year..

 

The in tank pump was a replacement for the block mount pump. Just please tell us you bypassed the in-tank pump for the fass? If not, you are gonna loose your brand new pump. 

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Mikelilly84

Mikelilly84

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Hey thanks for the reply! Yes I installed the fass with the beans sump in bottom of tank. I’m almost convinced now the motor was built for a 01 truck. I just can’t get my head around why it won’t start if I unplug the crank sensor when there’s no tone ring on the crank and that it runs and idles so well minus the extended crank. I’m gonna plug the crank sensor plug into the cam sensor and hope it’s a complete 01 motor and 01 ecm. 

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Silverwolf2691

Silverwolf2691

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I'm gonna say sensor signal. The computer wants to see something there even if its not signaling any data. For instance, I run a mechanical fuel pump on my truck. It had a gen 1 or 2 airdog on it. When I unplugged the airdog relay from the pump connector I had a check engine light. So I cut the power wires from the relay and plugged it back into the fuel pump. No more check engine light. The computer was just looking for a load and the relay provided enough to keep the computer happy. Not exactly like a sensor, but might be similar to what's happening. 

 

Not sure what you can do besides swap all the stuff from an 01-02 truck that's listed in the article.. 

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Mopar1973Man

Mopar1973Man

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Be careful. The whole early vs. later trucks is a real issue. Make sure you have the right PCM and ECM being you can hook up to the cam sensor doesn't mean the ECM and PCM to count that number of tone wheel teeth. So if you get it hooked up and tach is weird or wrong value then you going to need the ECM and PCM reflashed. Being the tach signal is used by both for different reasons. Personally if I was in your shoes I would pull both ECM and PCM have them flashed as 2001 software. Then take the entire wiring loom out and ewxchange for 2001. Over the years of the 2nd gens there was some wiring that was change on pin location and usage. Again common for issues between early and later series truck on software and functions of each year.  

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Mikelilly84

Mikelilly84

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Update I got a nice 2001 engine harness and sent my ecm to auto computer specialist for a 01 flash. I’ll make another post about them and there awesome customer service when I get the ecm installed tomorrow. But I have another question. The engine harness I bought was supposed to be off an 01 truck but it has a one wire oil pressure switch plug. My truck has the oil pressure sensor (3 wire) I bought a oil pressure switch but the threads are to small. Did I get sold a 02 harness? What sensor/switch do I need to use? Any thoughts? I can probably find an adapter bushing to use the switch. 

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