Carrera DME failure????????
#16
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Speaking of BMX, who remembers Ashtabula?
My first BMX
racerbvd, I have a pacemaker that keeps my heart out of A-fib and V-tac so no I don't ride I just fund and transport. I could have killed my brother when I found out he gave my circa '78 Mongoose W/tuffwheel II's to a drug rehab center. Bastard!
I just traded some Porsche stuff for an old PK Ripper to restore and they have a very sweet & ridable Retro Ripper out now.
#17
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I remember how cool it was to sit on a frame so "short". After the old Schwinn curved down tube bikes this was a huge difference. I thought my knees were gonna hit my chin.
#18
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let the hijack begin....I got Gary Turner(GT Bicycles) to build her a one off Alliant when they were open a couple years ago. Remember Power Lite? I have a one off '07, yes '07, made exactly how I wanted it. They opened and shut down the shop almost in the same month. My kid is now factory Crupi in a way, so it's on the shelf. now we have hot pink Crupi's.
#19
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Note: To people who have bad things to say about LorenB, don't make rude comments about someone who gives a lot of valuable advice to this forum. Have any of you actually met him in person? He is a good guy and was watching out for my best interest why I asked him for help. Just because he is very opinionated that does not mean he is a jerk by any means. If someone came to me and tried to tell me that my PhD thesis was all wrong I'd snap right back at them, which is what I feel happens a lot in the Steve Wong Chip VS LorenB threads. .02 done. SPRING BREAK!!!!!
#20
I really don't know what the failure rate is. But I have made significant changes to my DME and I'm a EE by education, software eng. by trade. IMHO the boxes are very well built and should last 30+ years without issue.
However, they do have some possible failure points:
1. Already mentioned, weak or faulty solder joints. These are often the result of shock from bumping around under the seat. The box is bolted directly to the floor resulting in road bumps being felt by the box.
2. Any of the Darlington hi-current transistors that drive things like the Injectors and the ICV are always at risk of burning out. Ussually because of faulty external components like injector(s) (shorted) or ICV. This is why you should NEVER take a good DME and put it into a car that may have it's DME burned out! Always take the bad DME and put it in the good car for testing. If the problem car has an outside the DME issue (like shorted injector or harness) and you put the good DME in this problem car you just smoked the good box.
Just my thoughts on this.
However, they do have some possible failure points:
1. Already mentioned, weak or faulty solder joints. These are often the result of shock from bumping around under the seat. The box is bolted directly to the floor resulting in road bumps being felt by the box.
2. Any of the Darlington hi-current transistors that drive things like the Injectors and the ICV are always at risk of burning out. Ussually because of faulty external components like injector(s) (shorted) or ICV. This is why you should NEVER take a good DME and put it into a car that may have it's DME burned out! Always take the bad DME and put it in the good car for testing. If the problem car has an outside the DME issue (like shorted injector or harness) and you put the good DME in this problem car you just smoked the good box.
Just my thoughts on this.
Last edited by scarceller; 03-21-2008 at 11:47 AM.
#21
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Note: To people who have bad things to say about LorenB, don't make rude comments about someone who gives a lot of valuable advice to this forum. Have any of you actually met him in person? He is a good guy and was watching out for my best interest why I asked him for help. Just because he is very opinionated that does not mean he is a jerk by any means. If someone came to me and tried to tell me that my PhD thesis was all wrong I'd snap right back at them, which is what I feel happens a lot in the Steve Wong Chip VS LorenB threads. .02 done. SPRING BREAK!!!!!
#22
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My PO paid $1150.00 for a "New Computer" in 2002, 2 yrs before I bought the car. And $42 for a "New Comp. Relay" - presumably a DME relay.
Ian
Ian
#23
Here is a thread on Pelican where someone had a bad Darlington transistor that drives the ICV.
http://forums.pelicanparts.com/showthread.php?t=346667
If I found this in a DME I would suspect and fully test the Idle Control Valve, these transistors are tough and don't usually just burn out. They ussually fail because the current draw exceeded the specs of the transistor. Could be the cause of a faulty ICV (possibly shorted).
The best person I know that would know what fails (often) in these DMEs would be Loren.
http://forums.pelicanparts.com/showthread.php?t=346667
If I found this in a DME I would suspect and fully test the Idle Control Valve, these transistors are tough and don't usually just burn out. They ussually fail because the current draw exceeded the specs of the transistor. Could be the cause of a faulty ICV (possibly shorted).
The best person I know that would know what fails (often) in these DMEs would be Loren.
#25
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Here is a thread on Pelican where someone had a bad Darlington transistor that drives the ICV.
http://forums.pelicanparts.com/showthread.php?t=346667
If I found this in a DME I would suspect and fully test the Idle Control Valve, these transistors are tough and don't usually just burn out. They ussually fail because the current draw exceeded the specs of the transistor. Could be the cause of a faulty ICV (possibly shorted).
The best person I know that would know what fails (often) in these DMEs would be Loren.
http://forums.pelicanparts.com/showthread.php?t=346667
If I found this in a DME I would suspect and fully test the Idle Control Valve, these transistors are tough and don't usually just burn out. They ussually fail because the current draw exceeded the specs of the transistor. Could be the cause of a faulty ICV (possibly shorted).
The best person I know that would know what fails (often) in these DMEs would be Loren.
#26
Drifting
#27
racerbvd,
Please check and/or replace the DME relay first. Your symptoms are like what I expierenced about a year ago on an '87 3.2. Thanks to the knowledgeable and dedicated people on these threads I was able to get going again. But the mistakes I made along the way gave me valuable expierence. I also got very good advice from Loren and think very highly of him and his opinions. I remember a quote that said 70% of the boxes returned to systems consultants for repair were fine, with no operational problems. Also check your top dead center and speed sensors on the flywheel. they are located on the left (driver's side of the car on the transmission. I replaced both of mine due to the insulation falling off and actually got a bad new sensor. Thanks to murphslaw, iceman, porschemd and loren I was able to solve this frustrating delima. The advice to put your box in another car is money in the bank. Hope this helps.
Mark
Please check and/or replace the DME relay first. Your symptoms are like what I expierenced about a year ago on an '87 3.2. Thanks to the knowledgeable and dedicated people on these threads I was able to get going again. But the mistakes I made along the way gave me valuable expierence. I also got very good advice from Loren and think very highly of him and his opinions. I remember a quote that said 70% of the boxes returned to systems consultants for repair were fine, with no operational problems. Also check your top dead center and speed sensors on the flywheel. they are located on the left (driver's side of the car on the transmission. I replaced both of mine due to the insulation falling off and actually got a bad new sensor. Thanks to murphslaw, iceman, porschemd and loren I was able to solve this frustrating delima. The advice to put your box in another car is money in the bank. Hope this helps.
Mark
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#29
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According to the part number on the sticker it's a Porsche part. http://www.pelicanparts.com/cgi-bin/...811114&x=0&y=0
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