jbrentd's 2nd Chance CQ - Replacement 7A Going In

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Re: jbrentd's 2nd Chance CQ - Replacement 7A Going In

Postby jbrentd » Tue Feb 12, 2019 11:16 pm

PRY4SNO wrote:Good tip about swapping those fuses and relays. Nice to know exactly which ones to target.

IIRC the FP relay trick people use supplies 12.5v all the time, so 11v should be sufficient.


I wanted to throw that in there in case I ever needed to refer back to it in the future. Also a good thing to know if your relay goes bad and you don’t have a spare.
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Re: jbrentd's 2nd Chance CQ - Replacement 7A Going In

Postby jbrentd » Sat Feb 16, 2019 5:36 pm

After installing the new speed sensor, I went to try and start it and wasn’t getting any spark. So I had to start over with some checks. Looks like I have another bad hall sensor. Tested it via the workshop manual method and off the car too. With 12v supplied to the sensor, not getting any voltage across terminals 1 & 2 of the hall sensor as the window passes by. Ugh! This this is wearing my patience.

https://youtu.be/b8FIcLgOKV0

Are new hall sensors available? If so, can they be installed by a DIYer?
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Re: jbrentd's 2nd Chance CQ - Replacement 7A Going In

Postby DE80q » Sat Feb 16, 2019 6:16 pm

They we're available as of last year. I haven't looked in a while though. As for installing it, you need to pull the shaft out to do it.
"If you can't find one, make one"

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Re: jbrentd's 2nd Chance CQ - Replacement 7A Going In

Postby jbrentd » Sat Feb 16, 2019 6:22 pm

I found this link to a DIY guide. Although it’s for an early AAN with the tuna can distributor, it says it applies to the 7A as well.

https://12v.org/urs/Replacement%20%20of%20the%20Hall%20Sender%20on%20a%207A3BAANDistributor.pdf
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Re: jbrentd's 2nd Chance CQ - Replacement 7A Going In

Postby DE80q » Sat Feb 16, 2019 6:37 pm

Looks correct to me. Now, finding the sensor.
"If you can't find one, make one"

Dallastown, PA
1991 Audi 80 quattro (10vt project)
2007 Mitsubishi Raider(Dakota in disguise)
2014 Chevy traverse (It's what she wanted)
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Re: jbrentd's 2nd Chance CQ - Replacement 7A Going In

Postby jbrentd » Sat Feb 16, 2019 6:58 pm

According to this post on Facebook, Bosch 1237031296 can be used but it’s 180 degrees out. I guess due to its design. Looks different from the original where the plug and sensor are across from each other.

https://www.facebook.com/groups/SmallChassisAudi/permalink/1014206028777734/

https://www.amazon.com/dp/B001CO18IQ/ref=cm_sw_r_cp_api_i_5kkACbXSBP8ZC

I might give it a try.
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Re: jbrentd's 2nd Chance CQ - Replacement 7A Going In

Postby jbrentd » Sun Feb 17, 2019 7:48 pm

I ordered that hall sensor and started disassembling the distributor today. The pin that holds the gear on the shaft can be a bitch to remove. The flared end has to be ground down before it can be punched out. And punching it out required some heat and heavy pounding.

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Re: jbrentd's 2nd Chance CQ - Replacement 7A Going In

Postby jbrentd » Tue Feb 19, 2019 12:20 pm

Got the sensor in today and fitted it to the distributor. It showed up sooner than expected, so I need to go to the hardware store and get a 4mm roll pin for the gear.

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Re: jbrentd's 2nd Chance CQ - Replacement 7A Going In

Postby jbrentd » Wed Feb 20, 2019 8:03 pm

Well, it seems that most people that have used that style sensor did so on an early AAN with a tuna can style cam sensor or a 3B/7A that is on stand-alone and converted to COP.

I realized I may not have thought this through completely. If we were dealing with a 4 or 6 cylinder, it would work, but there isn’t a corresponding wire terminal that is exactly 180* across from what is normally number 1. Doh! Look like I’ll be returning that sensor.

I have this one on order, but it’s a little more expensive.

Bosch 1237031292 Timing Module https://www.amazon.com/dp/B001COAMLA/re ... BCbGVM062K
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Re: jbrentd's 2nd Chance CQ - Replacement 7A Going In

Postby jbrentd » Sat Feb 23, 2019 7:17 pm

Got the distributor back together with a new sensor, cap and rotor and installed it on the car. Also replaced the ignition reference sensor. Was still not starting. While testing for power at the distributor, the positive wire gave up by breaking off at the terminal. So, I repaired that...still no start. Back to testing for power at the distributor and I wasn’t getting 12v across the plug. I was getting 12v from the positive wire to engine ground.

So, I got looking for wiring issues between the distributor plug and the ECU. Everything looked fine. I plug the ECU back in and check the distributor plug again and I was getting a nice steady 12v across the plug. I thought, I better try to fire it up. Sure enough, it started right up like it should. It scared the crap out of me because I wasn’t expecting it to start and there’s no exhaust after the header.

It’s been started several times since. I’m not confident that my troubles are behind me yet, but at least it’s running! Pretty sure there’s something wrong with the distributor ground wire.

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https://youtu.be/RsyZIHyfZiM
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Re: jbrentd's 2nd Chance CQ - Replacement 7A Going In

Postby PRY4SNO » Sat Feb 23, 2019 7:51 pm

These old cars can be a love (hate) affair.

When I rebuilt my black UrS4 it had been together and ready to go for about a month but would not fire up. Was renting a garage so had to have it flat decked to a friend's garage when the lease was up. Not long after I found out I had installed an extra ground from the passenger side of the block to the motor mount bracket... would have never guessed an extra ground would prevent it from starting. But once I removed the second ground wire, she fired right up and never had another issue like that again. Frustrating while you're chasing down every little thing, but oh so satisfying when you get it.

Plus now you have some new parts, and some (probably good) spares to either sell or keep just in case.
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|| 2010 Golf Sportwagen TDI /// Farmenwagen
|| 1992 80 quattro 20v /// Eventual AAN'd Winter Sled
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Re: jbrentd's 2nd Chance CQ - Replacement 7A Going In

Postby jbrentd » Sat Feb 23, 2019 10:49 pm

PRY4SNO wrote:These old cars can be a love (hate) affair.

When I rebuilt my black UrS4 it had been together and ready to go for about a month but would not fire up. Was renting a garage so had to have it flat decked to a friend's garage when the lease was up. Not long after I found out I had installed an extra ground from the passenger side of the block to the motor mount bracket... would have never guessed an extra ground would prevent it from starting. But once I removed the second ground wire, she fired right up and never had another issue like that again. Frustrating while you're chasing down every little thing, but oh so satisfying when you get it.

Plus now you have some new parts, and some (probably good) spares to either sell or keep just in case.


I was starting to question why I bought it back. lol

That extra ground would be hard to track down.

I’ve tried to not shotgun parts at it which has caused me to think some parts were okay when they really weren’t. I do think it needed the ignition reference and engine speed sensors. They were both low on ohm checks. I don’t think anything was wrong with the hall sensor, but I can throw that sensor in another distributor, but I would need a new gear since it had a plastic gear.

I hope to move towards re-assembling everything and getting it on the road.
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