I'm stumped with a no start problem, Fuel injection strikes again Options

[brant]

Hi everyone,

sorry for basically posting the same problem I've been chasing for 3months...

1972 1.7 with Djet

I've Done nearly everything... honestly.. tested and re-tested... This weekend I even changed the FI harness completely..... So I guess I'm going to start over from scratch and give it one more go around.

The good news is that my problem has gotten worse and now its to the point of not starting, so it should be easier to find than when it was intermittent.

The symptoms.
when the car is cold (or sits for 30 minutes) it will start and then run for 30-60 seconds. During this running time it is smooth, hitting on all cylinders, and sounds good....

However, after 30 seconds it dies and will not restart until it has sat for 30 minutes.

During the "dying" it shows spark at the timing light and Fuel Pressure on a guage... During its no start period, it continues to have spark at each plug wire, and continues to have 29.6psi of fuel pressure at the guage...

So I've got to think its FI related. I swear, I've tested everything except for the cold start sensor, and TPS....
but I guess I had better start over...

Is there something with this type of symptom I should check first?

I thought FI points, but have tried 3 sets yesterday to no avail. I also ohm tested the 25 pins on the ECU and they were all fine.

Is there something in the regulator board that would cause this problem, other than the power to the Fuel pump (since I have pressure still).

thanks everyone.
brant

[brant]

John or anyone,

one thing I haven't tested yet is the TPS...
Will a bad TPS case a no start condition?
will it cause a no start irrelevant of throttle position?

(when I tested the 25pin ECU connector I was able to get all 10 different continuities from the TPS, and if memory serves there was a pin for TPS idle that measured correctly also)

regarding the cold start sensor... I removed it once and tested it... thought it was bad, but found out my ohm meter was bad.... So your right, I do not know if this part is good/bad...

Question, If I unplug the wire to this sensor it is supposed to slightly enrichen the mixture... unless if was shorting somehow, I didn't suspect that it would cause a no start.. in fact it is not even directly tied to the ECU, but rather gets its power from the starter circuit in the regulator board... What are your thoughts on this?
It seems like unplugging it would solve any possible short, so maybe I'll try that.

brant