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Posted by: The Cabinetmaker Aug 12 2013, 06:59 PM

Stopped at a red light and tach dropped to 0, and engine died. Started right back up, but wouldn't idle. Made it back to my shop by keeping the rpms up when stopped. Runsu just fine, just won't idle. Unplugged the tps and it idles fine. Plug it back in, and engine dies. Haven't got to look at it yet, wondered if anyone else has experienced this and what the cause was. 40 years, and this is a first.

Posted by: type47 Aug 13 2013, 07:07 AM

I had mine suddenly run really crappy, turned out to be the MPS.

Posted by: sportlicherFahrer Aug 13 2013, 11:53 AM

I would try cleaning the contact plate inside the TPS and then re-adjust it. Mine has given me issues before and that seems to take care of it.

Posted by: Tom_T Aug 13 2013, 11:59 AM

Curt -

Someone on here in member vendors was making replacement TPS circuit boards for them, if yours looks worn at the contacts.

Cheers!
Tom
///////

Posted by: The Cabinetmaker Aug 13 2013, 04:33 PM

I have a new board that has been adjusted. I'm just wondering what in the tps would make the car not idle. It seems a more likely cause would be the ecu not receiving a signal or not reading it correctly.

Posted by: 76-914 Aug 14 2013, 02:45 PM

Haven't experienced this first hand Curt but read a thread where someone finally discovered the finger(s) were tweeked longitudinally. e.g. riding on their side. GL

Posted by: r_towle Aug 14 2013, 09:12 PM

Let or djet?

Vacuum leak on ljet will do this...like a rack in the big tube, or the oil cap seal or print is bad.

Vacuum leaks on ljet kill the motor at idle
Vacuum leaks on djet or carbs make high idle

Posted by: Cap'n Krusty Aug 14 2013, 09:57 PM

The car will idle and run fairly well with the TPS unplugged .....................

The Cap'n

Posted by: The Cabinetmaker Aug 15 2013, 06:40 PM

You are correct as usual Cap'n, but you already knew that.



I've been working out of town this week (retirement doesn't pay very well), but I'll get back to it saturday.

Posted by: Java2570 Aug 17 2013, 08:10 AM

That is a bizarre one.....maybe a break in the wiring somewhere?? Weird!

Posted by: The Cabinetmaker Aug 17 2013, 10:34 AM

I just got done with my yardwork this morning and headed to my shop shortly. I'll start with the tps part of the harness.

More to come.

Posted by: rmital Aug 17 2013, 10:56 AM

Curt...you wouldn't happen to have a spare know good MPS?
my rebuilt one drove great, but idled badly; needed to adjust.

Posted by: The Cabinetmaker Aug 17 2013, 03:14 PM

Got it fixed turned out to be the ecu. all is good now.

Posted by: 76-914 Aug 18 2013, 10:32 AM

File a complaint, Curt. You were cheated. These things should last more than 40 yrs. don't ya think?

Posted by: rmital Aug 18 2013, 11:18 AM

...I'm very curious these days...must be all the vacation/relaxation the past week.....so have to ask; How did the problem lead you to the ECU??? do tell, what was the process??????

Posted by: The Cabinetmaker Aug 18 2013, 11:58 AM

Sorry Ray, it was mostly a process of elimination. Wiring checked good, tps adjusted to 0 ohms. Using brad anders chart I checked ohms at #17 wire on the ecu plug. He called for under .5 ohms. After dismantling a tps and sanding the gold on the board, then hand polishing it with jewellers rouge, it ohmed at .2. No change. It just had to be the ecu. Since I already had the plug off, it was simple to check.