Just a question,
If your Thermostat is stuck open, (or missing) what problems would you encounter? (besides the obivous low water temp).

Would the vehicle run really rich? Would you get the smell of fuel in your oil?
My BII runs really rich, but sometimes it will "snap out of it" and will have more power then I know what to do with. This only lasts for a gear or two. The temp never reaches above the lower line in "Normal"

I have replaced the TPS, and had the carb partially rebuilt.

Any suggestions?

 

Yes, a thermostat that is stuck open (or any other condition that causes the engine to run too cold or make the computer think it's running too cold) will cause the engine to run rich. The computer operates in warm up mode, and one of the things the computer does in warm-up mode is to run rich.
At least, that's the way the 2.9 (EFI) works, and I believe it's the same for the 2.8.

 

Thanks!
Thats what I thought. but had to get backup.
Guess I need to tear into the thermostat and replace it.

thanks again!

 

Running rich? Blowing black exhaust smoke? Gas smell in the oil too? Then I'd say you're theory is right; thermo stuck wide open.

P.S. Just in case you're not aware, BII stock thermo's have a heat rating of 185 degrees. GOOD LUCK!

 

Well, I ripped into the thermostat, and to my surprise, there wasn't one!

I got 1 185 deg thermo and stuck it in... (thanks Jimmy James for the suggestion!)

Works like a charm!

Now, I have another problem, but I will make a new thread for it... If you guys could help, please do!

Thanks again!

 

If the problem continues check the vacum line to the fuel pressure regulator. Any gas in means a bad regulator and would cause rich running when started & sometimes hard to start.