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troutcatcher
P Plater
18 Posts
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 Posted - 21 Aug 2011 : 1:27:44 PM
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I have an early VN commodore v6 in my jet boat and have a lot of problems with crank sensors failing. I had to fit a new DFI module when I fitted the engine to the boat. I put in a Tridon coil pack (square coils) and a Tridon ign module. I was wondering if I should fit a second hand factory round coil pack and ign module. The crank sensors only last about six hours . Any help would be appreciated. By the way I live in Christchurch (shaky city) New Zealand.
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VNGRPA
Fully Licenced
426 Posts
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Posted - 21 Aug 2011 : 6:18:35 PM
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| with you saying you have the square coil packs there off a ser 1 vn v6 are you using a white crank sensor or a black one because if your using a ser 2 crank sensor on a ser 1 motor it will burn out in a few hours a ser 1 motor has a white crank sensor and a ser 2 has a black one |
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troutcatcher
P Plater
18 Posts
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Posted - 22 Aug 2011 : 5:50:30 PM
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| Thanks for that information. Cant remember what colour because this is the fourth one I have replaced. I am thinking of getting a series 2 coil pack and will make sure I get a black sensor. The other thing I have been told to check is all the earths are connected as the electronics on these motors are suseptable to this. |
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troutcatcher
P Plater
18 Posts
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Posted - 25 Aug 2011 : 5:30:24 PM
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| The sensor I was using is a white one. I have a feeling the DFI and coil pack I bought are giving me the problem. I am wondering if anyone knows the volatge that should be at the crank angle sensor with the engine turning over on the starter. (not running) If this is faulty I have the chance of getting a series II coil and DFI which I will fit a series II crank sensor |
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VNSVLE
Forum Moderator
1316 Posts
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Posted - 26 Aug 2011 : 09:13:31 AM
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if it is the white one it will be adjustable and will need to be adjusted correctly. The series 2 has a fixed position sensor and cannot be adjusted. I dont believe that the series one and series 2 sensors are interchangeable. Also i dont believe the series one and two harmonic balancers are interchangeable. I think the gaps on the interrupter rings are different.
As for voltages it should be between 10 and 12 volts coming from the DFI module.
Another thing to look for is bad earths. This may be a factor in the failure of this sensor. It also gets its earth from the DFI module so check the earth to it. I believe it has its own earth strap.
See how you go with that and let us know
Cheers |
What's the difference between understeer and oversteer?
Understeer is when the driver is scared.
Oversteer is when the passenger is scared. |
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VNGRPA
Fully Licenced
426 Posts
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Posted - 26 Aug 2011 : 1:49:16 PM
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| yer i just had to replace my crank sensor and the ser1 and ser2 are not interchangeable same with the harmonic balancers |
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troutcatcher
P Plater
18 Posts
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Posted - 26 Aug 2011 : 5:16:32 PM
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| Thanks for the info. I have unplugged all the wiring and checked every earth and get good readings. I was thinking of changing to the round coil packs as mine is the square one. I priced a new crank sensor today @ $100-00 NZ. Can I test the voltages by cranking the engine over or will it have to be running. It is very difficult in a jet boat as you need to have it in water. I have also have been lent a spare coil pack which I will test the voltages with mine.As for the letters ABCD on the crank sensor or GHMN on the DFI module do you know which ones carry the current and which are the earth. |
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VNSVLE
Forum Moderator
1316 Posts
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Posted - 26 Aug 2011 : 8:21:56 PM
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D on the crank sensor and N on the DFI is the power to the sensor. It should be a White/Black wire.
Earth will be C on the sensor and M on the DFI or the Grey/Red wire.
A and B are the 3x and the 18x sensor inputs into the DFI module.
I believe that there should be power at the sensor as soon as you turn the ignition on.
I hope this helps buddy.
Let us know how you go
Cheers |
What's the difference between understeer and oversteer?
Understeer is when the driver is scared.
Oversteer is when the passenger is scared. |
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troutcatcher
P Plater
18 Posts
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Posted - 27 Aug 2011 : 6:27:01 PM
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| Thanks for you info, it is what I was looking for. will work on the boat next week and let you know the results. |
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troutcatcher
P Plater
18 Posts
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Posted - 29 Aug 2011 : 6:14:29 PM
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| Did a wiring test today and the voltage reading on my coil, and the borrowed one are about 11 volts , so no obvious fault. Would like to find a fault to restore my trust in it before tackling any big rivers. Will let you know how if I find any faults. |
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VNSVLE
Forum Moderator
1316 Posts
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Posted - 30 Aug 2011 : 12:34:33 AM
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Let us know how you go buddy
cheers |
What's the difference between understeer and oversteer?
Understeer is when the driver is scared.
Oversteer is when the passenger is scared. |
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VNGRPA
Fully Licenced
426 Posts
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Posted - 30 Aug 2011 : 4:54:03 PM
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| almost sounds the same as what my problem was when i first put the supercharger on my car i kept burning out my crank sensor so i pulled the engine apart and i noticed my crank was a little warped witch keep making the crank sensor read a strange signal and made the harmonic balance cut up the crank sensor so i replaced the crank and it has been fine ever since i hope that's not your problem mate |
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troutcatcher
P Plater
18 Posts
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Posted - 30 Aug 2011 : 5:17:20 PM
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| Have had the harmonic balancer in the lathe and set the rings up running true last time. Have changed to a VR coil as the new square one I have in the boat I think was made in China . Just have to get a new crank sensor now and fit a small heat exchanger I made for the fuel line and I will be racing. Will post a photo of the engine when I can work out how to do it,or get help from my daughter. |
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troutcatcher
P Plater
18 Posts
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Posted - 04 Sep 2011 : 5:17:40 PM
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| I had the boat at the river today and there still seems to be a problem. May bee comming out of the computer, the engine misses if yiou give it a booot to 3600rpm and then starts missing. Maybee the fault in the computer>. I have not isolated the battery can can get a scan read and see whats happening |
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troutcatcher
P Plater
18 Posts
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Posted - 05 Sep 2011 : 5:53:59 PM
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Had the computer checked today and it is reading everything ok. Been informed it maybe the fuel pump or the diaphram at the end of the fuel rail. Will check this out tomorrow and keep you up to date
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troutcatcher
P Plater
18 Posts
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Posted - 11 Sep 2011 : 2:03:28 PM
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| I have had the engine running since fitting coil and crank sensor. The engine fired up great, but after warming up and taking the engine up to 3000rpm it started missing and backfiring. I have pressure gauge on the fuel line and have 100psi with pump line blocked off. With fuel line connected to rail I have 40psi. When engine starts and idles I have 30psi, and when reving up the vacum gauge drops to 5 and the fuel pressure remains at 30psi. The Holden agents in NZ dont have new ones, but i can get a second hand one. What pressure should be at the rail with the engine on idle and at 3000rpm.Any help would be appreciated |
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VNGRPA
Fully Licenced
426 Posts
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Posted - 11 Sep 2011 : 2:27:48 PM
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| on idle fuel pressure should be between 45 and 50 i was told as for the 3000rpm it should be the same but if anyone else knows better pls say as it has been a while since mine was at the stock pressure |
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VNSVLE
Forum Moderator
1316 Posts
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Posted - 11 Sep 2011 : 10:07:08 PM
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on idle 34 - 37
ignition on engine not running 40 - 46 |
What's the difference between understeer and oversteer?
Understeer is when the driver is scared.
Oversteer is when the passenger is scared. |
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troutcatcher
P Plater
18 Posts
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Posted - 02 Oct 2011 : 7:50:00 PM
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| I have spent hours searching for the backfiring problem as the computer comes up code 12. I have bared some wire from the throttle position sensor and did voltage checks. The voltage to the TPS is 5volts but the voltage out is 3.8 volts. I was sure I was in the right area of the problem so I disconnected the TPS and the engine ran great , up to 4900rpm without a miss. The computer reading is now telling me I have a TPS fault. Does it cause a problem to allways run the engine with the computer in fault mode. I have tried 3 different TPS modules and either i am fitting them wrong but they dont seem to go right to the end of thier stroke. I can get the TPS to give off 5 volts output by turnig it with a screwdriver. Any help would be appreciated. |
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troutcatcher
P Plater
18 Posts
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Posted - 04 Oct 2011 : 7:06:37 PM
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| I think I have found the problem, a small drive adaptor that fits on the bottom of the throttle body shaft. I contacted our major Holden dealer in Christchurch who said these adaptors fit VN thru to VT but General Motors no longer carries them and they are unavailable new. But wreckers here will not split them from the throttle body. |
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troutcatcher
P Plater
18 Posts
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Posted - 27 Nov 2011 : 3:32:49 PM
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| I thought I would keep you up to date. The TPS was fine but the coolant sensor was reading .4 v instead of .9 to 1.5 v. Changed the sensor and the backfire disappeared but still had a miss. So took the inlet manifold off and found the gasket rubber seals all squigly. Fitted new gasket and had the boat at the river today ( still tethered to the trailer)and all systems seem to be ok. I also made and fitted a small heat exchanger cooled by river water to keep the fuel temp down and this seems to be working fine. |
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VNSVLE
Forum Moderator
1316 Posts
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Posted - 27 Nov 2011 : 3:41:23 PM
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Excellent news buddy!!
Good to see things coming together nicely! |
What's the difference between understeer and oversteer?
Understeer is when the driver is scared.
Oversteer is when the passenger is scared. |
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Crank Sensor
