Question about 1996 Plymouth Grand Voyager

2 Answers

I have a 1996 Plymouth Grand Voyager SE with a 3.3 liter V6 Engine. It hasn't been firing on the 6th and 3rd spark plugs, and is only running off of 4 of them. I was told to replace the camshaft position sensor, which I did, and it still is doing the same thing. The coil pack, spark plug wires, and spark plugs are all brand new also. Any suggestions?

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  • tufforda May 11, 2010

    I had a diagnostics test ran, because of the engine light being on. A code for the cam shaft sensor is what came up. I visually checked the spark plugs for spark when cranking the ignition. No spark to two plugs.

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  • Master
  • 4,088 Answers

The coil pack unit's circuit #3 drives plugs #3 and #6 directly from the PCM. If the cam sensor was defective, it should not fire any plugs. Suspect bad wiring from the PCM to the coil pack, the PCM unit itself, or a segment of the camshaft position sensor surface has lost magnetism causing missing signal to the PCM. An oscilloscope is the best test instrument for chasing down a missing pulse problem. The missing timing signal also explains why the PCM would report a 'bad camshaft sensor'. Hope this helps!

Posted on May 12, 2010

Testimonial: "I appreciate the in depth explanation of what could cause those specific plugs not to fire. I was told to maybe try changing the crankshaft pos. sensor. I figure it can't hurt. Thanks a lot."

  • 4 more comments 
  • drallim May 13, 2010

    Again, if the crankshaft position sensor was bad, the engine woudn't run at all. Chilton's #20302 Chrysler, Dodge, and Plymouth van service manual--pages# 2-4 to # 2-7 covers the distributor-less ignition systems. A trip to your local library may find a copy of this manual. It covers 'failure to start', but not misfires of any particular sort. Page #2-5, fig# 17 shows the camshaft magnets that I was speaking of before, and is about the only part that could cause a specific misfire. If even part of one segment was chipped, or lost magnetism, it could cause an improper timing sequence. On the 2.4L engine, this device is replaceable after removing the sensor--they don't show any details for the V-6s. Good luck!

  • drallim May 13, 2010

    Again, if the crankshaft position sensor was bad, the engine wouldn't run at all. Chilton's #20302 Chrysler, Dodge, and Plymouth van service manual--pages# 2-4 to # 2-7 covers the distributor-less ignition systems. A trip to your local library may find a copy of this manual. It covers 'failure to start', but not misfires of any particular sort. Page #2-5, fig# 17 shows the camshaft magnets that I was speaking of before, and is about the only part that could cause a specific misfire. If even part of one segment was chipped, or lost magnetism, it could cause an improper timing sequence. On the 2.4L engine, this device is replaceable after removing the sensor--they don't show any details for the V-6s. Good luck!

  • drallim May 13, 2010

    Again, if the crankshaft position sensor was bad, the engine wouldn't run at all. Chilton's #20302 Chrysler, Dodge, and Plymouth van service manual--pages# 2-4 to # 2-7 covers the distributor-less ignition systems. A trip to your local library may find a copy of this manual. It covers 'failure to start', but not misfires of any particular sort. Page #2-5, fig# 17 shows the camshaft magnets that I was speaking of before, and is about the only part that could cause a specific misfire. If even part of one segment was chipped, or lost magnetism, it could cause an improper timing sequence. On the 2.4L engine, this device is replaceable after removing the sensor--they don't show any details for the V-6s. Good luck!

  • drallim May 13, 2010

    Again, if the crankshaft position sensor was bad, the engine wouldn't run at all. Chilton's #20302 Chrysler, Dodge, and Plymouth van service manual--pages# 2-4 to # 2-7 covers the distributor-less ignition systems. A trip to your local library may find a copy of this manual. It covers 'failure to start', but not misfires of any particular sort. Page #2-5, fig# 17 shows the camshaft magnets that I was speaking of before, and is about the only part that could cause a specific misfire. If even part of one segment was chipped, or lost magnetism, it could cause an improper timing sequence. On the 2.4L engine, this device is replaceable after removing the sensor--they don't show any details for the V-6s. Good luck!

  • drallim May 13, 2010

    Again, if the crankshaft position sensor was bad, the engine wouldn't run at all. Chilton's #20302 Chrysler, Dodge, and Plymouth van service manual--pages# 2-4 to # 2-7 covers the distributor-less ignition systems. A trip to your local library may find a copy of this manual. It covers 'failure to start', but not misfires of any particular sort. Page #2-5, fig# 17 shows the camshaft magnets that I was speaking of before, and is about the only part that could cause a specific misfire. If even part of one segment was chipped, or lost magnetism, it could cause an improper timing sequence. On the 2.4L engine, this device is replaceable after removing the sensor--they don't show any details for the V-6s. Good luck!

  • drallim May 13, 2010

    Again, if the crankshaft position sensor was bad, the engine wouldn't run at all. Chilton's #20302 Chrysler, Dodge, and Plymouth van service manual--pages# 2-4 to # 2-7 covers the distributor-less ignition systems. A trip to your local library may find a copy of this manual. It covers 'failure to start', but not misfires of any particular sort. Page #2-5, fig# 17 shows the camshaft magnets that I was speaking of before, and is about the only part that could cause a specific misfire. If even part of one segment was chipped, or lost magnetism, it could cause an improper timing sequence. On the 2.4L engine, this device is replaceable after removing the sensor--they don't show any details for the V-6s. Good luck!

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What actual test was done,to confirm that two cylinders are misfiring.
I believe,if that were the case,you would have an O2 Sensor Code,because it couldn't swing far enough, to correct two cylinders ,fuel mixture.
Was the Cam Sensor tested or you just threw one on.
Never replace any parts,until you test and confirm the need to replace,due to failure.
I would do a cylinder leakdown test. I suspect you have mechanical issues,effecting the two cylinders.
Or two dirty injectors,which seems unlikely
Also,maybe a vacuum leak,causing the misfire. Check intake manifold gaskets

Posted on May 11, 2010

  • mikew15 Sep 30, 2010

    in solution #2....What does a cylinder leak down test have to do with a no spark condition?Its stupid people like you the reason i NEVER take my vehicles in for repair.He said only 2 plugs were not fireing,...solution....replace the coil pack.

  • Anonymous Oct 01, 2010

    mikew15--You failed to read the gentlemans question.
    He had coil pack replaced!

    No dispute over cylinders not firing.

    I guess you never consider the engine, a vacuum pump or compressor,and always go for the electrical or electronic issues,trying to shotgun the problem in a hurry.

    You never consider any mechanical issues,rusted,damaged,broken crank positon trigger wheels,worn distributor parts, a history of head and cam issues on the carvans and voyagers,timing belts.

    Iam not offended,I actually thought it was the person with the question getting back to us.

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