worf928

Now I'm confused. Does it start every day as per second post? Or does it never start after a day per the first post?

Sounds like it starts but *only* if you use the foot to the floor method?

When you mash the pedal to the floor during cranking there are no fuel injector pulses.

Thus, you either have something leaking fuel into the intake system or a weak electrical system. Or both.

Edit:
What happens if, a day after running the 928, you attempt to start the 928 but *immediately* use the foot-to-the-floor method *without* first attempting a "normal" start with no pressure on the throttle pedal?

Mrmerlin

did you smell the vacuum lines for fuel?
when was the last time you put in a bottle of techron?

mark928gt

Ok. Sorry for the confusion. Dave you are correct in that it only starts using the foot to the floor method when cold but it does start every time. It will start right up normally once it is warm.

Stan - I've not ever used Techron. Yes I will go get some and put it in.

Quick update: When I was putting the Temp II sensor back in I looked closer at the wires on the connector. About an inch down from the connector the insulation had worn off the wires and they were exposed. Looks like they may have been touching. I cut back the insulation and separated the wires. For tonight I put electrical tape on each wire to keep them separated. I wonder if this could have caused the Temp II sensor to malfunction. I think I will try to start it normal again in the morning and see if this was the issue.

I have not smelled any fuel when removing any of the vacuum lines. I think this would only come from the dampers or the FPR right? Since these hold vacuum I don't think I have leaks here.

If the car does not start right away tomorrow. I will not start it but will let it sit for a few hours and then try the pedal to the floor method right away as you suggested Dave.

Thanks for the help guys.

worf928

Possibly. My jury's still out on if the temp-II trims cranking pulse width. It's been too long since I played with my Shark Tuner.

That's not quite what I suggested above. I want your 928 to run, then sit overnight, then have you immediately try the foot-to-the-floor method.

However, if your 928 starts normally tomorrow then possibly your electrical tape fix has worked. (The proof is in the repeated tasting of the pudding.)

The foot-to-the-floor method is what you do when you think the engine is flooded with fuel. If the engine is not flooded with fuel then the foot-to-the-floor method will not start the car. So, if, after sitting overnight, and thus residual fuel should have evaporated, it starts with foot-to-the-floor method then fuel accumulated in the airguide overnight.

If it doesn't work as a result of your TEMP-II fix, I suspect that with my test it will not start and that your problem isn't fuel leaking overnight. But, let's do it step-by-step.

Next question: have you had your LH computer rebuilt? If so when? And by whom?

mark928gt

This morning I went down to the car. Leaned in the window and turned the key. The car fired right up. I have to say it must have been the Temp II sensor. Whether it had come loose a little and affected the ground or whether the frayed wires may have been the culprit. I'm not sure but I do know that they both were a problem. Of course I won't really be convinced until I fire it up again tomorrow morning and everything is good.

Thanks for everyone's help on this! My 928 would not be on the road (and I'm not just talking about this small event) if it were not for this forum and the great people here. Thanks guys!

Now, what is the best way to fix my Temp II wires? Should I just buy a new connector and splice it in? This seems like it might be the cleanest option.

FredR

You can get a new connector and splice it in or you can remove the pins from the connector using a safety pin and insert a new section of cable from the existing connectors back to solid wire cores in the loom if the connector is in good enough condition..

worf928

The TEMP-II needs a crush ring 14x18 mm (IIRC) in order to seal. Poor ground can cause running problems. Usually not starting problems though. But, since I was apparantly wrong about the TEMP-II triming cranking pulse width I'm probably wrong about that too.

If the problem is an inch from the connector you don't have enough length to simply replace the connector. From the many connectors I've replaced, you've got just enough extra length on that branch of the LH harness to replace the connector once. But, no extra length to replace and inch of harness.

You'll have to splice. What I might do in the same situation, if the actual copper part of the leads is in good shape I'd tape them or use liquid electrical tape and re-shrink wrap that branch of the harness (and use a new connector and boot.) That avoids big ugly butt splices.

If the copper isn't in good shape then you'll need to butt splice. In those situations I use the marine-grade solder-shink type splices that combine solder and heat shrink.

https://www.masterappliance.com/sold...jar-lead-free/

You used to be able to get these in packs of 5. Not anymore apparantly.

Roger has 2-pin connector kits. Or you can get them hereL https://eagleday.stores.yahoo.net/connectorkit.html (and order the angled boot not the straight one.)

There are also 'pigtail' connector kits that have connector and an inch or three of leads.

The pins on the TEMP-II sensor are glued into the connector body. At least on '87-91. So, not de-pinnable.

mark928gt

Thanks guys. I started the car again this morning. Started up no problem. I'll get the electrical connection fixed and drive it a bit before we head off to the Badlands. I'll check for that crush washer and make sure everything is sealed up well.

Thanks again for all your help and expertise.