1999 dodge caravan new pcm new crank and cam sensor new coil pack new flexplate still no spark, scannner show sync problem, any ideas

make sure the timing belt didn't break!

Cam and crank sensors must be gapped right. The hold down is sloted so it can be moved closer or further away. New sensor should have come with a small felt pad on the end. Push the sensor in until it stops. If the gap is to much you may get an internmitent spark. ( I have also gotten bad cam sensors right out of the box)

The first thing to check is the ASD relay which powers several things.

yes def change crank sensor that controls the coil on wen to spark... cam sensr usually controls injector pulse.... good luck

Crankshaft senor. This sensor supplies info to the ECM, that inturns sends the info to the ignition module that controls the spark. Check the codes.

This could be a number of things...
Crank sensor, cam sensor, coil, PCM, spark control module, ect.
Start with the sparkplugs, make sure they are firing if not work your way back from there spark pligs, wires, coil, control module, cank and cam sensors, PCM this is what i would do if this rolled into my shop.

I have a problem with a 1999 Dodge Intrepid 2.7. Looking for some help or suggestions.

Problem: I only have a spark from the #2 coil.

Background:

Vehicle purchased from an Auction and would not start. The vehicle would only backfire. When I removed the valve covers I found that one of the rocker arms had popped out. I replace the heads with heads from a 2001 Intrepid 2.7. I used the cams, primary and secondary timing chains from the 1999 heads. Not sure if I used the original primary (left) cam sprocket from the 1999 or one I purchased in a kit from a Dodge dealership. I tried to use the new primary timing chain but it was not the same. The replacement heads were surfaced and a new head gasket was used. When I tried to start the vehicle it had no spark. The vehicle had set at several locations and parts may have been removed or changed.

Solutions Tried:

I tried 4 ASD relays with no effect. I then tested all 4 on a 2002 Intrepid 2.7 that runs and all worked. I then discovered that the Crank PS has missing. I replaced the Crank PS with one from a 2002 Intrepid 2.7 with no effect. I then replaced the Crank PS with a Crank PS from a 1999 Intrepid 2.7 and got a spark at the #2 coil only. I then replaced the PCM and TCM from the same 1999 Intrepid I got the Crank PS from and still only have spark from #2 coil. I then changed the Cam PS, still spark only from #2 coil. I have tried several coil packs on connector #2 and all have spark. Each coil pack that sparks on #2 will not spark on any other connector. Spark from #2 coil is weak.

I then replaced the wire harness from the PCM to the coils and fuel injectors and still only have spark from the #2 coil. What am I missing? Any suggestions, advice or related information will be greatly appreciated!

Thanks!

Keith P. Richardson

[email protected]

404-606-0728

On this model engine, the power to the coil pack is delivered directly from the power transistors located inside the PCM.
If you are not getting the signal to fire going into the coil, verify you are getting a good waveform from the crank angle sensor, and that the wiring from it to the PCM is intact. If the crank sensor is delivering signal to the PCM, and the PCM is not generating pulse via the internal power transistors, the PCM has failed (the power transistors blow open, it is fairly common on this Chrysler PCM).

Make sure cam and crank sensor are active. pcm must see these signals before allowing primary part of coil pack to energize. crank sensor will be possible suspect,usually located on engine to bell housing. flexplate or flywheel is the reluctor wheel or like a shutter wheel for the sensor to identify the position of crank for spark delivery. see if you have voltage at harness to coilpack with key on? if not you have another problem.

check fuel, compression and spark.