Random shutdown problem...
Thread Starter
Instructor
Joined: Apr 2016
Posts: 213
Likes: 5
Random shutdown problem...
Hi guys, 2005 M6,
I've got a random shutdown problem and not sure where to go with diagnosis, i'm thinking cam sensor because of Tech II readings but would like some guidance please.
After recording ignition data with Tech II and reviewing the data, i noticed that the CMP sync counter was incrementing from 0 to 255 (not sure if that is normal?) but the CMP sensor reading was pegged at 1040 RPM and not fluctuating.
The CRK sensor and sync counter appear normal, CRK sensor matching vehicle RPM.
But then suddenly the CMP sensor started to read for a few seconds and then froze again and at the same time the spark went from 13 deg down to 0 and -5.
The spark then went back upto 13 deg but CMP still froze.
Any advice on where to look next?
Cheers
I've got a random shutdown problem and not sure where to go with diagnosis, i'm thinking cam sensor because of Tech II readings but would like some guidance please.
After recording ignition data with Tech II and reviewing the data, i noticed that the CMP sync counter was incrementing from 0 to 255 (not sure if that is normal?) but the CMP sensor reading was pegged at 1040 RPM and not fluctuating.
The CRK sensor and sync counter appear normal, CRK sensor matching vehicle RPM.
But then suddenly the CMP sensor started to read for a few seconds and then froze again and at the same time the spark went from 13 deg down to 0 and -5.
The spark then went back upto 13 deg but CMP still froze.
Any advice on where to look next?
Cheers
Moderator, Tech Contributor
Joined: Sep 2013
Posts: 15,615
Likes: 4,062
From: Cape Coral, Florida
Hi guys, 2005 M6,
I've got a random shutdown problem and not sure where to go with diagnosis, i'm thinking cam sensor because of Tech II readings but would like some guidance please.
After recording ignition data with Tech II and reviewing the data, i noticed that the CMP sync counter was incrementing from 0 to 255 (not sure if that is normal?) but the CMP sensor reading was pegged at 1040 RPM and not fluctuating.
The CRK sensor and sync counter appear normal, CRK sensor matching vehicle RPM.
But then suddenly the CMP sensor started to read for a few seconds and then froze again and at the same time the spark went from 13 deg down to 0 and -5.
The spark then went back upto 13 deg but CMP still froze.
Any advice on where to look next?
Cheers
I've got a random shutdown problem and not sure where to go with diagnosis, i'm thinking cam sensor because of Tech II readings but would like some guidance please.
After recording ignition data with Tech II and reviewing the data, i noticed that the CMP sync counter was incrementing from 0 to 255 (not sure if that is normal?) but the CMP sensor reading was pegged at 1040 RPM and not fluctuating.
The CRK sensor and sync counter appear normal, CRK sensor matching vehicle RPM.
But then suddenly the CMP sensor started to read for a few seconds and then froze again and at the same time the spark went from 13 deg down to 0 and -5.
The spark then went back upto 13 deg but CMP still froze.
Any advice on where to look next?
Cheers
Last edited by C5 Diag; Oct 9, 2018 at 08:25 AM. Reason: add waveform
Thread Starter
Instructor
Joined: Apr 2016
Posts: 213
Likes: 5
Hi mate.
Yeah got it started ok after our work over the past couple of weeks but just now got to iron out a random shutdown.
The cam sensor was looking a bit strange on the Tech II, got solid CRK signal but intermittent CAM signal.
I already had a new CAM sensor so went ahead and fitted it today, (its a crazy location, i had to remove a ton of stuff) but it seems to have made a difference. on the scan tool it stays static around 1050 RPM but then when i increase throttle it matches RPM on Engine speed and CRK sensor so looks good.
I let the car idle for 20 minutes and it stayed running, just need to take it for a run tomorrow and hope it doesnt cut out on me, its always a worry incase it does it in a dangerous place.
But gotta bite the bullet and hope for the best.
i will use the scope if i have any issues.
It was cutting out on idle BTW.
Yeah got it started ok after our work over the past couple of weeks but just now got to iron out a random shutdown.
The cam sensor was looking a bit strange on the Tech II, got solid CRK signal but intermittent CAM signal.
I already had a new CAM sensor so went ahead and fitted it today, (its a crazy location, i had to remove a ton of stuff) but it seems to have made a difference. on the scan tool it stays static around 1050 RPM but then when i increase throttle it matches RPM on Engine speed and CRK sensor so looks good.
I let the car idle for 20 minutes and it stayed running, just need to take it for a run tomorrow and hope it doesnt cut out on me, its always a worry incase it does it in a dangerous place.
But gotta bite the bullet and hope for the best.
i will use the scope if i have any issues.
It was cutting out on idle BTW.
Moderator, Tech Contributor
Joined: Sep 2013
Posts: 15,615
Likes: 4,062
From: Cape Coral, Florida
Hi mate.
Yeah got it started ok after our work over the past couple of weeks but just now got to iron out a random shutdown.
The cam sensor was looking a bit strange on the Tech II, got solid CRK signal but intermittent CAM signal.
I already had a new CAM sensor so went ahead and fitted it today, (its a crazy location, i had to remove a ton of stuff) but it seems to have made a difference. on the scan tool it stays static around 1050 RPM but then when i increase throttle it matches RPM on Engine speed and CRK sensor so looks good.
I let the car idle for 20 minutes and it stayed running, just need to take it for a run tomorrow and hope it doesnt cut out on me, its always a worry incase it does it in a dangerous place.
But gotta bite the bullet and hope for the best.
i will use the scope if i have any issues.
It was cutting out on idle BTW.
Yeah got it started ok after our work over the past couple of weeks but just now got to iron out a random shutdown.
The cam sensor was looking a bit strange on the Tech II, got solid CRK signal but intermittent CAM signal.
I already had a new CAM sensor so went ahead and fitted it today, (its a crazy location, i had to remove a ton of stuff) but it seems to have made a difference. on the scan tool it stays static around 1050 RPM but then when i increase throttle it matches RPM on Engine speed and CRK sensor so looks good.
I let the car idle for 20 minutes and it stayed running, just need to take it for a run tomorrow and hope it doesnt cut out on me, its always a worry incase it does it in a dangerous place.
But gotta bite the bullet and hope for the best.
i will use the scope if i have any issues.
It was cutting out on idle BTW.
Thread Starter
Instructor
Joined: Apr 2016
Posts: 213
Likes: 5
No, on the C6 it's tucked at the back next to the harmonic balancer and has a shield around it and it was incredibly difficult to get to with the power steering reservoir and coolant pipes in the way.
I got an AC Delco OEM cam sensor, i also have an ignition switch on order and should be here on Monday so gonna fit it as a precaution as i think mine is hit and miss on the starting and going between ACC etc.
Good diagnosis call on yours.
I got an AC Delco OEM cam sensor, i also have an ignition switch on order and should be here on Monday so gonna fit it as a precaution as i think mine is hit and miss on the starting and going between ACC etc.
Good diagnosis call on yours.
Moderator, Tech Contributor
Joined: Sep 2013
Posts: 15,615
Likes: 4,062
From: Cape Coral, Florida
No, on the C6 it's tucked at the back next to the harmonic balancer and has a shield around it and it was incredibly difficult to get to with the power steering reservoir and coolant pipes in the way.
I got an AC Delco OEM cam sensor, i also have an ignition switch on order and should be here on Monday so gonna fit it as a precaution as i think mine is hit and miss on the starting and going between ACC etc.
Good diagnosis call on yours.
I got an AC Delco OEM cam sensor, i also have an ignition switch on order and should be here on Monday so gonna fit it as a precaution as i think mine is hit and miss on the starting and going between ACC etc.
Good diagnosis call on yours.
Last edited by C5 Diag; Oct 7, 2018 at 03:56 PM.
Moderator, Tech Contributor
Joined: Sep 2013
Posts: 15,615
Likes: 4,062
From: Cape Coral, Florida
[QUOTE=mazzerman;1598118098]Next for me, i would like to get a coil/injector harness, the heat has started to harden all the cables.
Yeah i'm sure we will both get them sorted soon.
[/QUOTE
Did you ever find that ground for the coils on the bottom of the car ??
Yeah i'm sure we will both get them sorted soon.
[/QUOTEDid you ever find that ground for the coils on the bottom of the car ??
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski