no start with injectors clicking
#31
Three Wheelin'
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Cyberpunky,
I've been having this same problem with our '86 951. I found one of the reference sensor wires to be cracked, with all the metal strands exposed (the sensors are "new-ish"). I tried taping the three individual wires to make sure they weren't shorting against each other. This worked for a few days, then it wouldn't start again yesterday. I went out this morning moved the reference sensor wires around a bit and it started. While it was running, I moved the wire I had taped and it stalled. Repeated this, started again, played with wire, stumble, then stall.
I have ordered the Lindsey racing reference sensor replacement harness, which replaces the wiring from the sensors to the DME.
Good luck.
Roger
I've been having this same problem with our '86 951. I found one of the reference sensor wires to be cracked, with all the metal strands exposed (the sensors are "new-ish"). I tried taping the three individual wires to make sure they weren't shorting against each other. This worked for a few days, then it wouldn't start again yesterday. I went out this morning moved the reference sensor wires around a bit and it started. While it was running, I moved the wire I had taped and it stalled. Repeated this, started again, played with wire, stumble, then stall.
I have ordered the Lindsey racing reference sensor replacement harness, which replaces the wiring from the sensors to the DME.
Good luck.
Roger
#32
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Convert your spare ECU to a 28 pin so you can use it for testing, make sure you install the jumper wire in location 700 on the board! I forgot to do this when installing my Mtune and my injectors were clicking like crazy with the key in the run position. After retracing my steps and figured out the missing step the car fired right up with no issues.
You could always install a switch instead of a jumper and then you would have a 24 or 28 pin ECU!
You could always install a switch instead of a jumper and then you would have a 24 or 28 pin ECU!
#33
Three Wheelin'
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I have bitten the bullet and given my car to a Porsche mechanic. After chasing the issue for nearly a year on a daily driver, and throwing a bunch of money at it, I just want car sorted. Admitedly a lot of the things I have done weren't specifically aimed at fixing problem, and were mods I did have planned for down the track. This just bought them forward in the hope that maybe one of them might also sort the issue out. The mechanic doesn't think that it will take much to get it sorted, so I am hopeful of a quick solution. I can't wait to see how all my mods have changed the car. New Vitesse stage 2 turbo, M tune and some other stuff should be good for 300+ish HP so will be intesting to see the results
#34
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I have bitten the bullet and given my car to a Porsche mechanic. After chasing the issue for nearly a year on a daily driver, and throwing a bunch of money at it, I just want car sorted. Admitedly a lot of the things I have done weren't specifically aimed at fixing problem, and were mods I did have planned for down the track. This just bought them forward in the hope that maybe one of them might also sort the issue out. The mechanic doesn't think that it will take much to get it sorted, so I am hopeful of a quick solution. I can't wait to see how all my mods have changed the car. New Vitesse stage 2 turbo, M tune and some other stuff should be good for 300+ish HP so will be intesting to see the results
![Wink](https://rennlist.com/forums/images/smilies/wink.gif)
#35
Three Wheelin'
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Yeah can't wait, he is hoping to have a bit more news next week. He has to buy a fitting so he can hook up a fuel pressure tester, due to me using the CEP fuel rail Vs factory. Can't wait to do another SMT although the weather is against it ATM
#37
Geaux Tigers!
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What does fuel pressure look like? and do you have spark?
I got this from Bruce, have used it a lot and it's reasonably priced.
http://www.arnnworx.com/catalog/inde...0#.VUL109pVikp
He also makes an ignition checker... I ordered it today.
http://www.arnnworx.com/catalog/inde...1#.VUL1ZdpViko
I got this from Bruce, have used it a lot and it's reasonably priced.
http://www.arnnworx.com/catalog/inde...0#.VUL109pVikp
He also makes an ignition checker... I ordered it today.
http://www.arnnworx.com/catalog/inde...1#.VUL1ZdpViko
#39
Three Wheelin'
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Nothing to report at this stage Eric. My mechanic is testing stuff and doing stuff on it inbetween the main jobs he has on, to help keep my costs down, which is great, as I am not in a position to say just fix it and end up with huge bill. He has also been waiting on a part that will let him test feul pressure, as the CEP rail means you can't just use a normal tester. Can't wait till she is fixed and to feel the Vitesse and M tune in action
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#40
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For future reference, here is the update on my issue. It was indeed cracked wires in the reference sensor harness that was causing my problem. However, the new harness I obtained (not from Lindsey) was assembled wrong, where the position of one of the signal wires was swapped with the ground wire. So it still didn't start after replacing the wires. Naturally, this was one of the last things I checked this time, assuming that the new wires couldn't be the issue. So after a couple more weeks of hair pulling (well, not really much hair left to pull), I discovered the faulty new wires, got a replacement set sent, reinstalled, and it fired right up. What a pain!
(Of course, now that this is fixed, I think my fuel pump check valve has failed and it won't re-start hot. New check valve going in tonight. Never ends with this car!)
Roger
(Of course, now that this is fixed, I think my fuel pump check valve has failed and it won't re-start hot. New check valve going in tonight. Never ends with this car!)
Roger
#42
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After 9 years, I need to resurrect this old thread. I'm having the same issue as you. What did your mechanic finally figure out about your problem with the clicking injectors? Was it fuel starvation or bad DME / chip problem?
It seems to me the DME is the likely culprit from all the information I've gained so far, so I'm surprised your last post was about fuel starvation.
#43
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For future reference, here is the update on my issue. It was indeed cracked wires in the reference sensor harness that was causing my problem. However, the new harness I obtained (not from Lindsey) was assembled wrong, where the position of one of the signal wires was swapped with the ground wire. So it still didn't start after replacing the wires. Naturally, this was one of the last things I checked this time, assuming that the new wires couldn't be the issue. So after a couple more weeks of hair pulling (well, not really much hair left to pull), I discovered the faulty new wires, got a replacement set sent, reinstalled, and it fired right up. What a pain!
(Of course, now that this is fixed, I think my fuel pump check valve has failed and it won't re-start hot. New check valve going in tonight. Never ends with this car!)
Roger
(Of course, now that this is fixed, I think my fuel pump check valve has failed and it won't re-start hot. New check valve going in tonight. Never ends with this car!)
Roger
I'd like to test your memory, as this thread is 9 years old. You mentioned you were having the same problem as Cyberpunky and the reference sensor harness fixed it. I don't see that you ever mentioned if your injectors were clicking like made with the ignition switch on but engine not running. Do you recall if they were doing this?
I'm trying to decide my next steps...DME rebuild or reference sensor harness...
Thanks,
Aaron
#44
Three Wheelin'
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Hi Aaron
We never got that fixed as such, as car just wouldn't run with the rogue DME. I ended up going for a VEMS plug n play ECU. As soon as we fitted it, the car started first time. I adjusted fuel Req and did an autotune and got car purring. Since then have changed a few things but sadly all I know is the car took 2 years(and great expense) to finally get sorted and driving properly and it was only fitting the VEMS set up that sorted it all out. Not much help I know, sorry
We never got that fixed as such, as car just wouldn't run with the rogue DME. I ended up going for a VEMS plug n play ECU. As soon as we fitted it, the car started first time. I adjusted fuel Req and did an autotune and got car purring. Since then have changed a few things but sadly all I know is the car took 2 years(and great expense) to finally get sorted and driving properly and it was only fitting the VEMS set up that sorted it all out. Not much help I know, sorry
#45
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Thanks for the follow up. I also have the Rogue chip, and I have my worries. But last night I found fraying in my reference sensor wires (same as Roger in this thread), so my hope is a new harness will fix it. If not, looks like I'll be going back to the stock chip and air flow sensor. I'll follow up in another post after I fix the wires.
Update: wires were not frayed, but I replaced the reference sensor wiring harness anyway and it didn't fix the problem. Looks like it is either the Rogue chip or the DME. This is the second DME that's gone bad with the Rogue chip. Next step is to remove the Rogue chip and go back to stock setup.
Update: wires were not frayed, but I replaced the reference sensor wiring harness anyway and it didn't fix the problem. Looks like it is either the Rogue chip or the DME. This is the second DME that's gone bad with the Rogue chip. Next step is to remove the Rogue chip and go back to stock setup.
Last edited by Aaron_Neumann; 08-22-2024 at 08:46 AM. Reason: I made a mistake