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p2164
Newly Aquired
Joined: 27 Apr 2008
Posts: 15
Location: MISSOURI
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 Posted: Mon Apr 28, 2008 12:24 pm Post subject: Faulty crank trigger |
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| I found this site while searching for an answer to a problem which I have had in the past which is a faulty crank trigger. It has happen twice on a R5 turbo and just the other day on a 427 GT40. The crazy part is that the both cars ran perfect and where parked and the next day or in the R5 case weeks later it would not start and the crank sensor is OPEN or no resistance, fried. It has to happen either while you turn off the key when its running or when you try to start the next time. I have a TEC 1 unit on my Countach for 15 years and never had a problem but this is the third time with TEC 2. Someone have an idea? Anyone had similar problem?
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TimZ
founding member
Joined: 25 Feb 2008
Posts: 120
Location: Dearborn, Michigan
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| Posted: Tue Apr 29, 2008 1:30 am Post subject: Re: Faulty crank trigger |
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| p2164 wrote: |
| I found this site while searching for an answer to a problem which I have had in the past which is a faulty crank trigger. It has happen twice on a R5 turbo and just the other day on a 427 GT40. The crazy part is that the both cars ran perfect and where parked and the next day or in the R5 case weeks later it would not start and the crank sensor is OPEN or no resistance, fried. It has to happen either while you turn off the key when its running or when you try to start the next time. I have a TEC 1 unit on my Countach for 15 years and never had a problem but this is the third time with TEC 2. Someone have an idea? Anyone had similar problem? |
Wow - nice cars!
The main problem that I have had with the crank trigger pickups are that the old-style ones are fragile. If the trigger wheel makes any contact at all with the sensor it will die shortly thereafter. In my experience they don't go all at once though - there is usually a period of intermittent problems first..
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p2164
Newly Aquired
Joined: 27 Apr 2008
Posts: 15
Location: MISSOURI
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| Posted: Tue Apr 29, 2008 11:17 am Post subject: |
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| That can explain a lot, if they die over a period of time and not all at once then that could be the answer, also I am using the old 3/8 style triggers. I usually gap them about .020 and perhaps they hit once and self adjusted then died later on. I wouldn't think that would be the issue but possible. As you well know its hard to get the trigger wheels just perfect.
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TimZ
founding member
Joined: 25 Feb 2008
Posts: 120
Location: Dearborn, Michigan
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| Posted: Tue Apr 29, 2008 11:50 am Post subject: |
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| p2164 wrote: |
| That can explain a lot, if they die over a period of time and not all at once then that could be the answer, also I am using the old 3/8 style triggers. I usually gap them about .020 and perhaps they hit once and self adjusted then died later on. I wouldn't think that would be the issue but possible. As you well know its hard to get the trigger wheels just perfect. |
If you pull the sensor and look at the little "nib" in the center of the business end you should be able to tell if it has made contact before. It it has just replace it.
Off topic, but are all three cars yours? I saw the pics of the GT40, but would love to see the other two - you don't see too many modified Countach's and you just don't see too many R5's period.
_________________
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Knowledge is not wisdom
Wisdom is not truth
-FZ, Joe's Garage
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p2164
Newly Aquired
Joined: 27 Apr 2008
Posts: 15
Location: MISSOURI
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| Posted: Wed Apr 30, 2008 11:55 am Post subject: |
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The GT40 is new to the heard, but I have two Ferrari's with forced induction, the old LP400s and R5. I will post some pictures in you member picture area. Not sure on which computer they are on so it will be only a couple at a time. All use electromotive. The collector purist of these cars hate me. Funny how you can make something much better but the value goes down. 
I am a retired electronics tech who now imports granite from Brazil and lives in the garage.
Oh by the way, the chissel was rubbed, so that was it but crazy how they don't fail till down the later. Every single time it was after I turned the car off for the night or couple weeks.
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TimZ
founding member
Joined: 25 Feb 2008
Posts: 120
Location: Dearborn, Michigan
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| Posted: Wed Apr 30, 2008 1:15 pm Post subject: |
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| p2164 wrote: |
The GT40 is new to the heard, but I have two Ferrari's with forced induction, the old LP400s and R5. I will post some pictures in you member picture area. Not sure on which computer they are on so it will be only a couple at a time. All use electromotive. The collector purist of these cars hate me. Funny how you can make something much better but the value goes down.
I am a retired electronics tech who now imports granite from Brazil and lives in the garage.
Oh by the way, the chissel was rubbed, so that was it but crazy how they don't fail till down the later. Every single time it was after I turned the car off for the night or couple weeks. |
Purists - meh.  For a long time I've wanted to find an old 308 or 328 with a blown engine and drop in a turbo'ed Nissan SR20 just to piss people off... 
Back on topic: It wouldn't hurt to look a little further into why the sensor made contact. Could be that the wheel is simply slightly off-center, which is easily remedied on a lathe. However, if your trigger wheel is mounted on the "floating" part of a two-piece damper, it could be that the elastomer that isolates the two pieces is starting to fail, which will eventually end up with the two pieces separating (bad). I've also seen dampers that have developed a hairline crack that allowed the damper to wobble (also bad). These types of failures are not uncommon on older vehicles.
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Knowledge is not wisdom
Wisdom is not truth
-FZ, Joe's Garage
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