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Underbody braces, turbos and more!

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PostPosted: Fri Jul 11, 2014 6:03 pm 
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Joined: Tue Feb 13, 2007 10:28 pm
Posts: 1175
Location: So Cal, USA
I got a flat line once after doing a headgasket.
Turns out I hadn't attached the multiple ground leads
to the side of the throttle body.

But this time I had 4 codes, MAF, Air Intake Temp, Throttle Position Sensor and
Coolant Temp Sensor. My first inclination was that they did not all go bad
at once, so I just swapped in a spare computer. The key was having a spare.
The codes disappeared, but then no spark so I swapped the coil and
it fired right up.

2 days later I went to pull it out of the garage and it idled for about
30 seconds then died, no spark. So I've left it since and have not had time
to diagnose it further.

I suspect a wiring issue somewhere. I hate gremlins :x
It currently has no codes. If I had to guess where to start next
it would be the ignition switch or main relay and go from there.

But to answer your question, I suppose that some circuits in a computer
can fail with out it flatlining. We had a Plymouth Voyager a while back
that had a charging system issue which turned out to be the ECM.
So yes, a computer can partially fail, not necessarily all at once.


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PostPosted: Sat Aug 16, 2014 3:02 pm 
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Joined: Tue Feb 13, 2007 10:28 pm
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Location: So Cal, USA


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PostPosted: Sun Aug 17, 2014 2:29 pm 
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Joined: Sun Apr 07, 2013 4:01 am
Posts: 87
Location: AZ
Good work/vid & may Old Reliable's next video be of its' million mile gala/bash! So, do you think your problem was just the ignitor all along? Just wondering if you replaced it first, if the car would have been OK: i.e. did the bad ignitor throw the code,or were the ECU & coil related with the ignitor going out in tandem? ... or should I not leave home w/out a spare ECU and ignitor in my car? :huh:


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PostPosted: Sun Aug 17, 2014 7:34 pm 
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Joined: Tue Feb 13, 2007 10:28 pm
Posts: 1175
Location: So Cal, USA
Replaced it last, I suspect it was the problem all along.
The ignitor does not throw a code. I think I created the codes
by disconnecting the components to check them, as I thought
I remembered when I first checked there was only normal code 12.


I could put the other ECU back in to see what happens, but
I'm not feeling that energetic right now after putting it all
back together and tending to some other issues.

I'm looking forward to driving it around again.


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PostPosted: Thu Aug 21, 2014 1:10 am 
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Joined: Sat Dec 05, 2009 7:58 am
Posts: 756
Location: not here
Great video Jamal, thanks. Some of my non turbo Mk1s would stop dead while I was driving but swapping a distributor out of a running Mk1 would fix it. There must be something in the distributor that starts failing when it gets warmed up. A mark 1 turbo I bought starts failing the same way, once its been driven for a while and warmed up and I think swapping in a coil, igniter and distributor out of one of my blown headgasket mk1s should fix that. Your video showing the turbo running so good after an igniter swap motivates me to get that done soon, thanks. I like too that you pointed at the igniter in the video, swapping it looks real simple.


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