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Topic: 24V Cosworth mystic stalling problem (Read 2822 times) |
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Scorpio_Mike
Senior Member
Jeep Grand Cherokee 3.0 V6 & 2.8 Sierra XR4i 4x4
Posts: 2351
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Re: 24V Cosworth mystic stalling problem
« Reply #20 on: Aug 3rd, 2018, 9:33pm » |
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on Aug 3rd, 2018, 4:50pm, Tompion wrote:The 24v has a separate belt for the aircon. |
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Star sign is Scorpio ! Sierra XR4i's are great...especially when fitted with 4WD
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Tompion
Administrator
1997 2.3 Ultima estate.
Posts: 2918
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Re: 24V Cosworth mystic stalling problem
« Reply #21 on: Aug 3rd, 2018, 10:08pm » |
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I thought it was the case - but had to look it up to check
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ABS multiplug wheel sensor pins MK IV or MK 20
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theogrenietis
Newbie
I'm a YaBB newbie!
Posts: 34
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Re: 24V Cosworth mystic stalling problem
« Reply #22 on: Apr 25th, 2019, 9:38pm » |
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Hey, Some time has passed, but still there is no solution to this mystic problem. Just to be sure I replaced the fuel pump which was not the problem. In my studies I have discovered, that when the car does not start, the injectors are not working, question is - why? I have replaced fuel pump relays and it didn"t change anything, the relay itself is a 2 stage relay so I can't hot wire it to get past the relay, because I don't know which pin does what. It was really strange that when I was measuring for voltage, there was voltage on the injector connector when the ignition was off, but the voltage was 6v. Does 24V cosworth fire all the bank injectors at the same time? If so, could it be possible that a shorted injector is making the whole bank to not fire? I have a donor car with a 24V cosworth PCM and PATS, if the problem is in the PCM, can I just replace the PCM and PATS for the car to fire up without problem? Or is some extra treatment needed?
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Pianoman
Full Member
24v Ultima Saloon & 2.0 16v Ultima Estate
Posts: 246
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Re: 24V Cosworth mystic stalling problem
« Reply #23 on: May 15th, 2019, 4:14pm » |
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I had the same problem on my 24v. Engine would start and run perfect for around 5-10 min then die. If left for a while, it would start again. The problem turned out to be chaffed wires going into the ECU. Once I taped these with electrical tape, the car ran fine.
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Tompion
Administrator
1997 2.3 Ultima estate.
Posts: 2918
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Re: 24V Cosworth mystic stalling problem
« Reply #24 on: May 16th, 2019, 10:29pm » |
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You can change the PCM, no need to change PATS. Presumably the dash light behaves as it should & doesn't flash a PATS code. The injectors fire individually. When the ignition is on they all receive + V from a common splice via the Violet plus trace side of their plugs as does the idle speed control valve which is also is connected to this splice. The PCM controls the negative side via the Black plus trace wires. The PCM pins used for injectors are listed here: http://www.fordscorpio.co.uk/24vlooms.htm
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ABS multiplug wheel sensor pins MK IV or MK 20
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theogrenietis
Newbie
I'm a YaBB newbie!
Posts: 34
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Re: 24V Cosworth mystic stalling problem
« Reply #25 on: Jan 6th, 2020, 8:47am » |
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Hi guys, there has been some movement in this case. Over the winter holidays I had spare time to spend with my troubled scorpio, it had been standing outside for the best part of a year, but once I connected a battery it started right up and ran fine form almost an hour, when it again went back to the darkside with a no start. I spent a lot of time with the wiring diagram and multimeter chasing major possibilities of the PCM not sending injectijon pulse to the injectors. I found that the PCM recieves all neccesery grounds and all battery + voltage, but in the end the injectors still don't open. The wiring harness to the injectors is new. My question is - does someone know hoe does the PCM thinks? Obviously the PCM is not receiving some vital signal, but how do I find which signals are vital and which ones are not. I have good spark so it would mean that the PCM recieves all signals regarding vital sensors. In order to find the missing signal I nees to find without which signal will shut down the injectors in the PCM. The PCM is good, I have tried to change it with another one, same simptoms. I can't scan codes, because the PCM is not connecting to the car. Please help, if you can. Regards
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theogrenietis
Newbie
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Posts: 34
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Re: 24V Cosworth mystic stalling problem
« Reply #26 on: Feb 10th, 2020, 11:11am » |
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The mystic problem is SOLVED. I went though the complete wiring diagram and found the problem on the EDIS comuninication with the PCM. It's a shielded wire and all 3 signal wires had NO insulation on the point were they enter the metal shield. Probably they were touching agaist each other in the shield as well. While the problem is fixed, it is still a mistery how could the car constantly work when it was cold and never run when it was hot and it stalled for the first time. If it wasn't for one user who said that EDIS could also STOP the injection, I would have never found the problem, because in the diagram a buch of things are connected to the PCM and there is no way of knowing which ones are critical. Happy Scorpio'ing!!!
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Nunnspoet
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I love YaBB 1G - SP1!
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Re: 24V Cosworth mystic stalling problem
« Reply #27 on: Feb 12th, 2020, 8:50am » |
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Wow, well done! You were determined to get to the bottom of this most frustrating, annoying, back breaking problem, and now you have done it. You must be pretty pleased with yourself, and rightly so . For well over a year my Cossie, Ruby, would not give me Cossie power. She was like a lame Duck, eventually my excellent local Garage sorted some of the wiring out and now Ruby is like a Spring Chicken, up and raring to go. Just driving (dribbling) along, I am constantly aware of the power under my right foot. So, as you say "Happy Scorpio'ing!!!" Mike
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