From rough idle to dying/no start
'90 Bronco Fullsize, 302 5.0 EFI,
(had previous post on pg.7) Pulled the codes and it showed a bad oxygen sensor. Replaced sensor and truck still ran real rough. Checked the EGR valve with vacuum, when vacuum was applied the idle would get rough, and the egr would hold the vacuum. Also am getting the correct voltage to it from the computer.
When I cleaned the Idle Air Control Valve with carb cleaner and then put it back on it would run smooth for about 15 seconds the the idle would get rough again.
When I tried driving the truck it shook horribly, and finally choked to death down the street. So now it's totally dead and won't start now at all! It turns over fine but it won't fire up. I checked for spark and that's good so I figure it must be a fuel problem.
Also, Tried to get a volatge from the IAC valve but didn't get a reading, I want to be sure that part is it before I spend the $81.00 for it. Could the IAC cause a problem this severe?
Thanks in advance for any help!