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I have a Chrysler 300m 1999 3.5 high output engine in a 2004 300m. The car has never ran good since the engine was installed. I took it to a retired Chrysler mechanic. He was going to replace timing belt and water pump and said it probably needed a crank sensor. I bought one but couldn't get it in the hole so I put the original back in. I took it to him to install when he was to replace the timing belt. When I picked the car up he said he had no problem getting it in. The car would start misfiring and shake and I would stop on the side of the road and turn the engine off and back on and it would run good for hours until it happened again. After talking to another mechanic, he said replace the crank sensor. I removed it and the plastic cover over it was half gone. I went to NAPA with it and got another like it. I couldn't get it in the hole. It was for a 2004 they said. Got one for a 1999 and it won't fit either. Went to junk yard and searched thru half a dozen 300m's and only one had something in the hole and it was a 115v 400w heater. That car was tagged a 2001. Don't know where the crank sensor is on that engine. The car will finally start with or without a sensor. Any ideas would be appreciated.
The hole is at the same place on the block as my engine but is deeper on the one that had the heater. So you say that the crank sensor on that block is higher up on that engine? I don't think there is a heater on my engine.
[quote="landlordsunited" post=20365 I bought one but couldn't get it in the hole so I put the original back in. I took it to him to install when he was to replace the timing belt. When I picked the car up he said he had no problem getting it in. Went to junk yard and searched thru half a dozen 300m's and only one had something in the hole and it was a 115v 400w heater. Any ideas would be appreciated.[/quote]
This is making me think maybe you're working in the wrong area? Not trying to insult you at all, but a block heater is in the engine block. Usually in the place of a freeze plug.
The crank sensor on these cars is in the transmission bellhousing.
Can you maybe post a pic of what your working with and where?
That's from alldata, i checked for the model year of the car and the year of the engine he's got.
It was getting late though...
If i have some free time today I'll check again. I also want to check the interchange of that engine. I don't think a 99 is supposed to be a for an 04.
99 engines are a fit from 99 to 02. 03 engines are 03 04 only. As luck would have it, a 2000 lhs was just dropped at my yard. If the engine in the car t the op is working on its truly from a 99, this is the exact same engine.
The way I read the post is that the car is an 04 with an 99 engine fitted? So the vehicle harness would go to the front of the engine for the sensor in the timing cover but maybe there's no tone ring there for it to read if the bottom end wasn't changed over in the 99 block? I would think the timing cover would have to had been changed for there to be a hole there though? Who did the engine swap? What did they transfer from original engine? I can't believe this vehicle runs without a crank sensor? Check the back of the block see if the sensor is there maybe someone spliced the wiring to hook up the rear crank sensor of the 99 motor?
All data shows the location is the same for an 04 and a 99. Are you using Mitchell or Google or BBB or something?
At a minimum the installer had to have changed the harness and very likely the flywheel and camshaft reluctor to make everything kosher with PCM.
Or maybe he didn't change one or the other and now the recurring crank sensor code and hard start.
Aren't these also the Chryslers that would sometimes mislable the Cam and crank sensor data\codes?
Ha you are right Noah I don't know what I looked up the other day that said it was in timing cover I must have had another vehicle open. Sorry for the confusion.
From the pictures that are posted and the info I have, I am at the right place. The 99 computer is still in that car. The wiring harness was transferred with the engine. The car doesn't start like it should. Once running, it runs fine unless you accelerate to try to pass someone and then it bucks like crazy. Got a p0325 after that. Thinking about getting a scope. How do you make the connection at the computer?
I'm starting to think we may have more than 1 issue here if it runs fine until you floor it we may have a plugged exhaust. Might be worth a try to remove upstream oxygen sensors , also a badly misreporting maf can cause similar symptoms do you have access to a scan tool with pid data?
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And even if you did remove something from the hole on the block, it was not the crank sensor. 
