Fires then dies. HELP - Page 3 - ZR-1 Net Registry Forums

XfireZ51 · 2 Days Ago

R u sure its the cam angle and not the crack sensor?

Ozruss90 · 2 Days Ago

Quote:

Originally Posted by XfireZ51

R u sure its the cam angle and not the crack sensor?

I?m assuming a typo and you meant CRANK sensor. No, I don?t know. The only reason why I have referenced the CAM angle sensor is that this, fire up and die straight away, situation started when I went to re start the car after pulling the cam angle sensor out to replace the O ring due to an oil leak
Should I pull the CRANK angle sensor out to check, and test (if possible) ?

Cheers, Russell 🇦🇺

RSLyrick · 2 Days Ago

I think that you would get no spark at all if the crankshaft position sensor was faulty, as the ignition module selects which coil packs to energize based on the sensor output. Your engine is starting and holding for a while and you checked that you had sparks, that already sounds good to me.

If this sensor is working fine, you should logically get RPM readings as well.

If you want to test it (we never know), there's a nice method provided in the FSM which allows you to test without removing the crankshaft position sensor from the engine and make it easy to test (see 6E3-A-32) :

1- Get yourself an engine coolant temperature harness from a 1985-1989 C4 (PN : 12046623)
2- Unplug the actual sensor harness from the sensor and plug the floating engine coolant temperature one in with the two floating leads.
3- Measure the resistance between the leads
4- Should be a value between 965 and 1075 Ohm at 25?C (77?F) for a working sensor.

In any cases, try to give a quick call to Marc. Please, give us a feedback about it, I'm interested!

Ozruss90 · 3 Hours Ago

Well it looks like the problem has been solved. I rang and spoke to Marc Haibeck yesterday and described my situation. He said start with the basics, has it got fuel pressure ? Yes confirmed by pressure gauge. When I told him it happened straight after removing the cam angle sensor, he suggested that I unclip the harness from the sensor to the ECM. I hadn?t done this as I had checked codes at the ALD port and no faults detected. I had also read in the FSM that the engine will still run without Cam sensor input, so assumed problem had to be elsewhere. Looks like the cam sensor is faulty and while connected to the ECM was causing an issue with the ECM. Once I unclippped that harness the engine fired up and idled as per normal. Very relieved to know what the problem was. Thank you Marc. 👍

NOW I have to source another sensor if anyone on here can help me out with one or steer me in the right direction to get one 🤞 would be much appreciated.

Cheers,
Russell. 🇦🇺

RSLyrick · 6 Minutes Ago

Hey Russel,

Very nice !

It's weird that the ECM didn't throw you a DTC31...must have been so confused by the non-working sensor that it didn't know how to react (the failure was probably not landing into the "missing pulses" category or "extra pulses" one...interesting.

So, if I'm not wrong, you will face the second issue. The camshaft sensor lands into the "hard to find parts" section. No longer manufactured or stored.

Original PNs were : 10137658 / 10137658 / 213-141

I came across the following threads about modifying an aftermarket one.

https://zr1.net/forum/showthread.php?t=28584

Phil (Jagdpanzer) seems to be able to make some based on aftermaket parts : he provided his email in the above thread : pwasinger@aol.com

Latest requests were done in February this year, so it should be feasible to get one I guess.

2 Days Ago	#21
XfireZ51 Join Date: May 2007 Location: Chicagoland, IL Posts: 9,700	Re: Fires then dies. HELP R u sure its the cam angle and not the crack sensor? __________________ [SIGPIC][/SIGPIC]Former Membership Chairman Former ZR-1 Registry - BOD 1972 Corvette 4speed base Coupe SOLD long time ago 1984 Corvette Z-51/4+3 SOLD 1992 Corvette ZR-1 Aqua/Gray #474 SOLD 1992 Corvette ZR-1 Black Rose/Cognac #458 2014 Honda VFR Interceptor DX

2 Days Ago	#23
RSLyrick Join Date: Oct 2023 Location: Germany Posts: 7	Re: Fires then dies. HELP I think that you would get no spark at all if the crankshaft position sensor was faulty, as the ignition module selects which coil packs to energize based on the sensor output. Your engine is starting and holding for a while and you checked that you had sparks, that already sounds good to me. If this sensor is working fine, you should logically get RPM readings as well. If you want to test it (we never know), there's a nice method provided in the FSM which allows you to test without removing the crankshaft position sensor from the engine and make it easy to test (see 6E3-A-32) : 1- Get yourself an engine coolant temperature harness from a 1985-1989 C4 (PN : 12046623) 2- Unplug the actual sensor harness from the sensor and plug the floating engine coolant temperature one in with the two floating leads. 3- Measure the resistance between the leads 4- Should be a value between 965 and 1075 Ohm at 25?C (77?F) for a working sensor. In any cases, try to give a quick call to Marc. Please, give us a feedback about it, I'm interested!

3 Hours Ago	#24
Ozruss90 Join Date: Oct 2016 Location: Shepparton. Vic. Australia Posts: 152	Re: Fires then dies. HELP Well it looks like the problem has been solved. I rang and spoke to Marc Haibeck yesterday and described my situation. He said start with the basics, has it got fuel pressure ? Yes confirmed by pressure gauge. When I told him it happened straight after removing the cam angle sensor, he suggested that I unclip the harness from the sensor to the ECM. I hadn?t done this as I had checked codes at the ALD port and no faults detected. I had also read in the FSM that the engine will still run without Cam sensor input, so assumed problem had to be elsewhere. Looks like the cam sensor is faulty and while connected to the ECM was causing an issue with the ECM. Once I unclippped that harness the engine fired up and idled as per normal. Very relieved to know what the problem was. Thank you Marc. 👍 NOW I have to source another sensor if anyone on here can help me out with one or steer me in the right direction to get one 🤞 would be much appreciated. Cheers, Russell. 🇦🇺

6 Minutes Ago	#25
RSLyrick Join Date: Oct 2023 Location: Germany Posts: 7	Re: Fires then dies. HELP Hey Russel, Very nice ! It's weird that the ECM didn't throw you a DTC31...must have been so confused by the non-working sensor that it didn't know how to react (the failure was probably not landing into the "missing pulses" category or "extra pulses" one...interesting. So, if I'm not wrong, you will face the second issue. The camshaft sensor lands into the "hard to find parts" section. No longer manufactured or stored. Original PNs were : 10137658 / 10137658 / 213-141 I came across the following threads about modifying an aftermarket one. https://zr1.net/forum/showthread.php?t=28584 Phil (Jagdpanzer) seems to be able to make some based on aftermaket parts : he provided his email in the above thread : pwasinger@aol.com Latest requests were done in February this year, so it should be feasible to get one I guess.