Will do when I get them out. I have the flexplate and the cam tone wheel from the original engine that I'm going to install once I get them out. I replace the wiring harness and plenum when I got the car back home. Never had such a problem with an engine swap before.

 

My understanding is that our engines run off the crank sensors up to 2500 rpm, and above that, ign. timing runs off of cam sensor. Our engines are not supposed to be able to run above 2500 rpm with cam sensor disconnected. Things are not adding up. I don’t have an explanation.

'99 and '00 should be the same. SBEC system (cam and crank tone wheels) was used until 2002, then used NGC system. Do you know the history of both engines, i.e., has either engine been previously swapped from an NGS vehicle or been converted to the NGS system? Sounds like that has to be the problem.

PEVA is absolutely correct here. IF in fact your new engine is a 2000, there would be no issue with tone rings, sprockets, or timing differences. This was all the same until 2002. Plug and play.

Guy from the junkyard said that it came out of 1999 300m, original engine. No mods and it ran before they took it out. The mechanic from the shop said that it was firing on 2 cylinders. He checked marks and the timing was dead on. He unplugged the cam sensor and it ran at about 5000 RPM. He checked all the grounds and found them all good. When he exhausted all of his ideas he sent the car down the road to a shop that had the diagnostic computer that said it was a cam sensor tone wheel. I looked at the tone wheel for damage and found none. I am in the process of pulling the engine again to swap flexplate and cam tone wheel. I live in Michigan and doing the job in my driveway, no garage. Any other help would be appreciated.

Either the year the engine is out of is incorrect; or there is some other more serious problem, or installation error (big vacuum leak, crushed a wire) causing these problems. Do you know if the mechanic had to swap any parts over from your old engine to the new one; IE wiring harness, plenum, etc?

 

I'm at a loss too. Both mechanics refused to work further on my car, not sure why but I had it towed home and am going to proceed with changing out the flexplate and the cam tone wheel. I'll let you know if it works. May take a bit though, working around weather and cold temps. Thank you for your input. It's much appreciated.

 

If you can, take a picture of the flex plate and cam tone wheels that were used. We can tell you instantly if they are correct for your year car.

 

Guy from the junkyard said that it came out of 1999 300m, original engine. No mods and it ran before they took it out. The mechanic from the shop said that it was firing on 2 cylinders. He checked marks and the timing was dead on. He unplugged the cam sensor and it ran at about 5000 RPM. He checked all the grounds and found them all good. When he exhausted all of his ideas he sent the car down the road to a shop that had the diagnostic computer that said it was a cam sensor tone wheel. I looked at the tone wheel for damage and found none. I am in the process of pulling the engine again to swap flexplate and cam tone wheel. I live in Michigan and doing the job in my driveway, no garage. Any other help would be appreciated.

 

My understanding is that our engines run off the crank sensors up to 2500 rpm, and above that, ign. timing runs off of cam sensor. Our engines are not supposed to be able to run above 2500 rpm with cam sensor disconnected. Things are not adding up. I don’t have an explanation.

 

'99 and '00 should be the same. SBEC system (cam and crank tone wheels) was used until 2002, then used NGC system. Do you know the history of both engines, i.e., has either engine been previously swapped from an NGS vehicle or been converted to the NGS system? Sounds like that has to be the problem.