98 Neon No Spark
#11
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if you used an oscilloscope you would see if the sensor is working properly. a dvom is not accurate to read crank sensor signal.
the crank sensor sends a signal to the pcm, this signal determines when the pcm fires the coil. you said you have no spark and didn't replace the crank sensor. heck if the cam sensor is bad, you still have spark but no fuel.![Icon Deadhorse](https://dodgeforum.com/forum/images/smilies/icon_deadhorse.gif)
the crank sensor sends a signal to the pcm, this signal determines when the pcm fires the coil. you said you have no spark and didn't replace the crank sensor. heck if the cam sensor is bad, you still have spark but no fuel.
![Icon Deadhorse](https://dodgeforum.com/forum/images/smilies/icon_deadhorse.gif)
#12
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if you used an oscilloscope you would see if the sensor is working properly. a dvom is not accurate to read crank sensor signal.
the crank sensor sends a signal to the pcm, this signal determines when the pcm fires the coil. you said you have no spark and didn't replace the crank sensor. heck if the cam sensor is bad, you still have spark but no fuel.![Icon Deadhorse](https://dodgeforum.com/forum/images/smilies/icon_deadhorse.gif)
the crank sensor sends a signal to the pcm, this signal determines when the pcm fires the coil. you said you have no spark and didn't replace the crank sensor. heck if the cam sensor is bad, you still have spark but no fuel.
![Icon Deadhorse](https://dodgeforum.com/forum/images/smilies/icon_deadhorse.gif)
Any other idea's??
#13
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scrap prices are up.
do you have a scanner,
do you have a wiring diagram
do you have an oscilloscope
do you have a factory service manual?
get these 4 items and dig in... now it's time to have a professional actually look at your problem cuz the internet isn't going to be able to solve this without more digging.... 99% of the neons I get through the shop with no start is due to crank sensor/or it's plug.
do you have a scanner,
do you have a wiring diagram
do you have an oscilloscope
do you have a factory service manual?
get these 4 items and dig in... now it's time to have a professional actually look at your problem cuz the internet isn't going to be able to solve this without more digging.... 99% of the neons I get through the shop with no start is due to crank sensor/or it's plug.
#15
#16
![Default](https://dodgeforum.com/forum/images/icons/icon1.gif)
scrap prices are up.
do you have a scanner,
do you have a wiring diagram
do you have an oscilloscope
do you have a factory service manual?
get these 4 items and dig in... now it's time to have a professional actually look at your problem cuz the internet isn't going to be able to solve this without more digging.... 99% of the neons I get through the shop with no start is due to crank sensor/or it's plug.
do you have a scanner,
do you have a wiring diagram
do you have an oscilloscope
do you have a factory service manual?
get these 4 items and dig in... now it's time to have a professional actually look at your problem cuz the internet isn't going to be able to solve this without more digging.... 99% of the neons I get through the shop with no start is due to crank sensor/or it's plug.
If it is a pcm, I would have bad luck we got 2 from a junk yard and niether work.
I'm going to check over the wires one more time, I'll even slice on a new end to the crank and cam sensor if needed.
**that reminds me, what I replaced the cam sensor the new cam sensor had a new connector in it so i spilced the wires (color for color) and installed. Maybe something is wrong with the connector. **
#17
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obd2 code readers are useless the don't have data stream.
seems odd that it ran before you fixed it.
in all my years wrenching, I can count all the computers I ever had go bad on one hand. and 2 were caused by people jump starting reversing the leads.
Spark is all generated by the signal from ONLY the crank sensor. even if you unplug the cam sensor, you'll still have spark. Cam sensor syncs injector sequence.
seems odd that it ran before you fixed it.
in all my years wrenching, I can count all the computers I ever had go bad on one hand. and 2 were caused by people jump starting reversing the leads.
Spark is all generated by the signal from ONLY the crank sensor. even if you unplug the cam sensor, you'll still have spark. Cam sensor syncs injector sequence.
#18
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obd2 code readers are useless the don't have data stream.
seems odd that it ran before you fixed it.
in all my years wrenching, I can count all the computers I ever had go bad on one hand. and 2 were caused by people jump starting reversing the leads.
Spark is all generated by the signal from ONLY the crank sensor. even if you unplug the cam sensor, you'll still have spark. Cam sensor syncs injector sequence.
seems odd that it ran before you fixed it.
in all my years wrenching, I can count all the computers I ever had go bad on one hand. and 2 were caused by people jump starting reversing the leads.
Spark is all generated by the signal from ONLY the crank sensor. even if you unplug the cam sensor, you'll still have spark. Cam sensor syncs injector sequence.
I think this year if the pcm doesn't receive a signal from the cam it won't send the voltage to the asd relay to power the coil pack. When I unplugged the cam sensor it only allowed ground to be send to the coil pack.
I guess I left out some important info. When I removed the coil pack there was a huge crack in the upper right top corner. When the car was running I reached over there (not touching)....and was shocked pretty bad. The car ran for another 4 minutes fine, and then just died. I thought maybe the coil pack was arching to the bolt that holds the coil pack in place the worked its way to the pcm.
As I mentioned, I replaced my pcm with 2 other pcm’s and same result.
I just finished checking the grounds to the senders along with signal to pcm and both have continuity and zero ohm’s.
One last thing I checked was the timing. I forgot that I put a mark (with pen) the TDC of the belt when it was intune with the BTDC. I was attempting to take off part of the timing cover and the belt is in the exact same location that it was when I timed it. So unless the pin shear off and the cam didn’t rotate with the cam gear than all is good with that.
And by the way thanks for all the suggests thus far!!!
#20
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So pcm? I guess I'm having a hard time trying to wrap my brain around the fact the other 2 pcm's didn't fire.