Question about 2001 Chrysler LHS

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Ok here we go. This is a good brain teaser for the Chrysler engineering and technicians. I own a 2001 Chrysler LHS that has been a decent car if you like to fix stuff, all the time. Recently my wife heard a knock coming from the engine. My friend is a tech, he came over and assured me I was hurting (money). After tearing into it I was stupid and did not check the EGR system. the sensor stuck inside the throttle body tried to pull away and striped the thread on the plunger. It moved so no codes were generated. It plugged the entire system causing oil problems and oil being pushed into the intake manifold. I poured a cup of oil out of it. The driver side of the engine was toast, must be the last place to get oil on its way to the filter. I am not rich. I found a 2006 transverse mounted brand new 3.5 engine. I investigated the needed changes and what could be different. Chrysler said they don't believe so. Stupid me believed them. I removed the timing cover, cam sprockets intake manifold and oil pan. I had to fill a spot with weld and grind it smooth. Everything else bolted up real nice. I now found out the wiring harness is brittle due to heat, some of the wires stuck together but did not contact the center conductor. Put everything back together and went to start the car. No spark ground signal to coils. My friend brought a $2500.00 snap on scanner and we went though it pretty good. everything was working in terms of crank sense cam sense etc.. No spark. put a extra coil on the motor with spark plug and test lead to ground meter in line. Nothing. Check ground connections OK. The book says the PCM could lose its memory if the it sits with no power to long. it sat for 3 weeks while I fixed everything. I find that hard to believe but I talking about Chrysler. The one issue that has me worried is that the cam sprocket ring for triggering the cam sensor and fuel pulse is different than the 01 model. The timing mark on the sprocket starts at the 3 hole on the 01 and the 06 engine over 1. I can send digital pictures if some one would like to help. I would pay to have this problem answered. The only difference in the sprocket is a milled key way and the 01 only has the d hole with no key way. Chrysler for some reason thought the cheesy key way was strong enough to remove the huge bolts that hold in the cam sprocket. You use a large wrench and a breaker bar and they mill a key way out of soft metal and then manufacture the engine using a gallon of thread locker. This car has been a nightmare..Final question does this engine use different cams because putting in the old sprockets from my 01 3.5 engine would be easy. New cams would be terrible. Heads would have to come off and lots of money spent. I am on budget due to getting the motor for $850. So far I am at around $1300 which is reasonable for a car that should last me a few more years. Any help appreciated.

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  • tginley May 04, 2010

    Thank you for the response. Yes we did have crank pulse according to his scanner. The issue may be the crank shaft flywheel from my 2001 3.5 and the cam shaft sprocket are from 2006 3.5. I put the sprockets side by side and the windows on the ring are not the same as the 2006 3.5. The 2006 3.5 has no D shape sprocket. Chrysler had the part manufactured with a key milled into the sprocket. Very weak, the key way snapped when changing the front cover. Bought another sprocket and it is the exact same thing. I went to the dealer and looked up the cam. It seems that the cam was used beginning in 06. I was told by Chrysler there was no diffidence with the motors. I just need to know if I swap out the sprockets to the 01 model will the cam profile and firing order work. Also can the PCM handle it. Major mess I didn't plan for.

  • tginley May 04, 2010

    Hey thanks. The wiring harness is the original 2001 LHS.
    The best way to explain would be the only thing I used was the block and heads and cam sprockets. The engine was a transverse model brand new with new coils exact same as the 01. I tore it down pulled the block off plugs and changed the front timing cover and oil pan. The only mod was the oil pan. I had a bud weld/ fill a curve which was exposed. It worked perfectly. I resembled everything else as stock. There can=m sprockets are the only difference. The timing windows are not the same. Is the firing order the same on all 3.5 and does the crankshaft have the same firing order as in terms of piston position. I think I may only have to swap out the cam sprockets to align the crank signal with the cam signal. I can not tell if the timing for both signals id she same to let the PCM fire the cylinder. Any help would be appreciated. I also check all the sensors and grounds and good. Have you heard of brittle wires not functioning properly due to running wires over the top of the motor, A lot of the wires were stuck together but not melted together. I know the wire losses its ability to flow electrons if it is baked. I have a harness like that but it checking OK but cant check to see the voltage drop using amp draw.

  • David Burbee
    David Burbee May 11, 2010

    Hello! Let me attempt to end your nightmare...First, a few questions...Which wiring harness are you using; The 2001 or 2006? Which Power Train Control Module (PCM) are you using with the 2006 3.5L; The 2001 or 2006? This is crucial, the 2001 3.5L coil on plug circuit is different from the 2006 circuit. Send a comment.....Guru..........Saailer

  • tuyen bui May 11, 2010

    did you check the fly wheel? the crank sensor pick up signal from the teeth on the flywheel. if the fly wheel is different then the problem can start from there.

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Hello! There isn't any difference between both engines...Find a replacement for the coil over wiring harness...Brittle is common...Wiring is the problem...Send a comment...Saailer

Posted on May 04, 2010

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Yo can swap the cams i just did a swap into a 300m that wasnt supposed to work i put an old iron 3.5 in place of an aluminum one swapped intakes and cams worked fine actually have more compresion now but back to you that would seem logical except you have no fire i would look harder at the crank sensor or the fuses

Posted on May 04, 2010

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