eurosport

Sorry for asking but to take out the transmission do you have to take out the engine? I'm new.

no you do not have to take out the engine to remove the transmission on this car

today we took out the transmission and removed the drive plate and what we found was

1 bent tooth on the drive plate. The bent tooth was right below the bolt hole.

We are putting it back together now and hopefully if all our research proves correct

the long crank problem should go away.

I will post the results tomorrow.

The Verdict is in ...... The drive plate bent tooth was without doubt the reason for the long crank problem.

today we took out the transmission and removed the drive plate and what we found was

1 bent tooth on the drive plate. The bent tooth was right below the bolt hole.

We are putting it back together now and hopefully if all our research proves correct

the long crank problem should go away.

I will post the results tomorrow.

Can you check that you are getting a spark when cranking (but not firing?)

Good point. If the crank signal is weak/not proper, I think the DME would not even try to fire the plugs.

Experts: After starting is CPS still used? Is there anything duramatic that can be monitored? thanks, Mike

No expert by any strech of imagination but I'm pretty sure the CPS is continuously monitored since there are so many other functions depending on it (e.g., relative camshaft position, misfire detection, etc.) As far as I know, there's nothing in durametric that directly displays CPS signal. There's a rough running value, which itself is based on the CPS measuring the acceleration/decceleration of the flywheel. Not sure what we can derive from that though.The mystery here is why it doesn't work when cranking but it does when the engine is up and running.

This is exactly the mystery.. at times it will crank 3 times and start.. other times it will crank 15 times to start... other times seems like it cranks 30 times to start...I think I am going to take the transmission out and look at the flywheel again.. I looked at the teeth through the CPS hole while manually turning it over.. Maybe there is more to it once I get it on the table in front of me

Use an oscilloscope to check the DME side (pin #46 signal and pin #32 GND) to make sure it's actually seeing the proper signal?

I do not have and oscilloscope im going to try using a bosch hybrid multimeter set on the ms-pulse setting to test it that way

Im trying to avoid spending 2000.00 for an ocilloscope

typically this tool im using is used to test for example the injector pulse

sorry, I did not know I double posted

No we did not change out the flywheel

and I looked at every tooth on the flywheel for damage

also I pin tested for the signal from the plug on crank sensor to the main pin #10 ground in the harness plug and have continuity and #9 signal has a continuity

we rebuilt an engine in a 2001 c4s

the car now has a long crank before starting

has new alternator and battery and wiring harness for starter

we replaced the crank sensor and cleared the code

the P1579 code keeps coming back for crank sensor - tried 2 new sensors

long crank all hot or cold conditions

I checked crank sensor connector and cleaned with dieelectric grease

fuel pressure is good and does not have any leak down

sometimes will crank 7 times then start some times 20 or more

Im chasing my tail on this one

Im open for all suggestions

Thank You