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1979 VW Convertible will start but immediately dies
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busdaddy
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PostPosted: Tue Nov 29, 2022 12:53 pm    Post subject: Re: 1979 VW Convertible will start but immediately dies Reply with quote

With all 4 unplugged?, if one is still connected it'll backfeed power through the injector coil.
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Sickies Garage
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PostPosted: Wed Nov 30, 2022 4:59 pm    Post subject: Re: 1979 VW Convertible will start but immediately dies Reply with quote

Found the problemÖ..I believe itís the ECU. Installed mine in another VW and my controller created the same problem in his car. Somewhere in the controller itís not sending the ground signal to the injectors.

Iíll start looking for another ECU tonight!

Thank you all for helping!
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Sickies Garage
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PostPosted: Wed Nov 30, 2022 5:39 pm    Post subject: Re: 1979 VW Convertible will start but immediately dies Reply with quote

It only ran on cold startÖnever made it to the injectors

busdaddy wrote:
Sickies Garage wrote:
Iíd like to test the coil wire that fires the injectors for continuityÖ.Does the other end of that wire land at the ecu connector or the double relay?

Terminal #1 in the ECU plug.

But as Lost and Jimbo suggest if it runs with the flap poked injectors and ignition are working properly, you have to find out why it can't make enough suck to keep the AFM flap off it's stop.
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busdaddy
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PostPosted: Wed Nov 30, 2022 5:42 pm    Post subject: Re: 1979 VW Convertible will start but immediately dies Reply with quote

Wow, that's very uncommon, but not impossible. You didn't happen to try the other car's unit in yours did you?

Part numbers listed here: https://ratwell.com/technical/FISwap.html although I have seen a few bug units in buses and bus units in bugs, most ran OK(ish).
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Sickies Garage
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PostPosted: Wed Nov 30, 2022 7:27 pm    Post subject: Re: 1979 VW Convertible will start but immediately dies Reply with quote

I did not try that one in mine. Found one here on Samba next state over. Hopefully Iíll have it by Friday and itíll run.
quote="busdaddy"]Wow, that's very uncommon, but not impossible. You didn't happen to try the other car's unit in yours did you?

Part numbers listed here: https://ratwell.com/technical/FISwap.html although I have seen a few bug units in buses and bus units in bugs, most ran OK(ish).[/quote]
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busdaddy
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PostPosted: Wed Nov 30, 2022 9:12 pm    Post subject: Re: 1979 VW Convertible will start but immediately dies Reply with quote

Sickies Garage wrote:
I did not try that one in mine. Found one here on Samba next state over. Hopefully Iíll have it by Friday and itíll run.

Well you've done very well with the ruling out of other potential causes, you get a big pat on the back for jumping in and learning instead of just blindly shooting the parts cannon at it, fingers crossed that a different ECU is the magic bullet for it.
Please keep us updated regardless of what happens.
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PostPosted: Wed Nov 30, 2022 11:28 pm    Post subject: Re: 1979 VW Convertible will start but immediately dies Reply with quote

busdaddy wrote:
Sickies Garage wrote:
I did not try that one in mine. Found one here on Samba next state over. Hopefully Iíll have it by Friday and itíll run.

Well you've done very well with the ruling out of other potential causes, you get a big pat on the back for jumping in and learning instead of just blindly shooting the parts cannon at it, fingers crossed that a different ECU is the magic bullet for it.
Please keep us updated regardless of what happens.


x2.

Just to triple askÖ..you are sure the ecu is receiving uncomprimised power and ground? If so, ecu it is!
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Plus I tend to prefer these impossible projects that take way too much time. Thereís no thrill in easy projects. Challenges are fun.

67rustavenger wrote:
GFY's Xevin and VW_Jimbo! Smile
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Sickies Garage
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PostPosted: Thu Dec 01, 2022 9:36 am    Post subject: Re: 1979 VW Convertible will start but immediately dies Reply with quote

Itís been a great learning experience for me. Yes the ground is good as well as the power to the ACUÖthank you!
VW_Jimbo wrote:
busdaddy wrote:
Sickies Garage wrote:
I did not try that one in mine. Found one here on Samba next state over. Hopefully Iíll have it by Friday and itíll run.

Well you've done very well with the ruling out of other potential causes, you get a big pat on the back for jumping in and learning instead of just blindly shooting the parts cannon at it, fingers crossed that a different ECU is the magic bullet for it.
Please keep us updated regardless of what happens.


x2.

Just to triple askÖ..you are sure the ecu is receiving uncomprimised power and ground? If so, ecu it is!
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VW_Jimbo Premium Member
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PostPosted: Thu Dec 01, 2022 10:55 am    Post subject: Re: 1979 VW Convertible will start but immediately dies Reply with quote

Good! I have only seen a few of the ECU go bad, like 2! I guess stuff does eventually give up!
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There is never enough time to do it right the first time, but all the time necessary the second time!
nshaddox wrote:
Plus I tend to prefer these impossible projects that take way too much time. Thereís no thrill in easy projects. Challenges are fun.

67rustavenger wrote:
GFY's Xevin and VW_Jimbo! Smile
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Sickies Garage
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PostPosted: Sat Dec 03, 2022 6:08 pm    Post subject: Re: 1979 VW Convertible will start but immediately dies Reply with quote

The verdict is inÖ.new ECM did the trick. Fired right up and purrs like a kitten! My question is which relay test would have identified that, if any?
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busdaddy
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PostPosted: Sat Dec 03, 2022 6:36 pm    Post subject: Re: 1979 VW Convertible will start but immediately dies Reply with quote

Yay! Cool

As for relay testing I don't think any test would have exposed that issue, the relay can only supply power to the ECU and injectors, the pulsed grounding is all the ECU's job.
Go buy a lottery ticket, you are one of the very few where an ECU swap actually solved the problem. I shudder to think of how many have been needlessly swapped when it was really something else to blame, the supply is dwindling and the "no testing before swapping" crowd is mostly to blame.
Don't trash your dead one, one day soon somebody will get into changing transistors or whatever is bugging it and save other vintage FI owners from a parts crisis. There's a few who have done it for their own projects, but not many who will touch others at this time.

Can't wait for the test drive review!
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Sickies Garage
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PostPosted: Sat Dec 03, 2022 8:12 pm    Post subject: Re: 1979 VW Convertible will start but immediately dies Reply with quote

Busdaddy,
Guys like you on forums is what is so valuable. Thanks for taking your time and patience with semi novices like meÖ.itís huge encouragement to keep trying. I was able to take it to a point where I felt comfortable enough to tap a local resource to test the ecm. I will buy a ticket and if it produces Iíll let you know! Iíll let you know how the first test drive goes. Thanks again!
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Sickies Garage
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PostPosted: Mon Dec 05, 2022 4:47 am    Post subject: Re: 1979 VW Convertible will start but immediately dies Reply with quote

Car drives great! I pulled the electronic ignition out in the very beginning to eliminate that early on so I am going to check the points and timing. Then will install the factory exhaust that they saved to replace the ugly aftermarket exhaust.
After that should be ready to go!


quote="busdaddy"]Yay! Cool

As for relay testing I don't think any test would have exposed that issue, the relay can only supply power to the ECU and injectors, the pulsed grounding is all the ECU's job.
Go buy a lottery ticket, you are one of the very few where an ECU swap actually solved the problem. I shudder to think of how many have been needlessly swapped when it was really something else to blame, the supply is dwindling and the "no testing before swapping" crowd is mostly to blame.
Don't trash your dead one, one day soon somebody will get into changing transistors or whatever is bugging it and save other vintage FI owners from a parts crisis. There's a few who have done it for their own projects, but not many who will touch others at this time.

Can't wait for the test drive review![/quote]
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