I tried cleaning the TBI with injector cleaner, while the TBI was attached to the intake manifold - no real help. I changed the fuel filter - the fuel filter was not blocked, but nasty stuff came out of it. Changing the fuel filter had no real effect.
I read a bunch of threads on the net about the stalling problem while in gear. I changed the IAC - there was a slight improvement. After changing the IAC it took a few more seconds, when in gear, before it would stall. I changed the EGR and PCV - which had no real effect. I changed the coolant temp sensor - also no effect.
The next thing seemed to be the fuel pressure regulator. The kit for the pressure regulator and the entire TBI rebuild kit with a new pressure regulator was a nominal difference, so I figured I might as well get the rebuild kit. I disconnected the TBI from the intake manifold. The gasket between the TBI and the intake manifold did not seem right. The gasket seemed to have squished into the underside of the TBI into the channels/canals that lead to various vacuum lines. Parts of the TBI were pretty dirty. Where the IAC goes into the TBI was pretty black. The vacuum lines were pretty dirty, but nothing was blocked by any means. I cleaned the TBI with throttle body cleaner and followed the instructions and did the rebuild (and changed the pressure regulator). It was not overly complicated. I don’t see how I did anything wrong.
When I put the TBI back on the intake manifold, reconnected everything and started up the truck it idled really high and steady and never dropped down. Any thoughts? I would like to first find out what may be going on with the TBI and if I did something wrong in the rebuild. Also the check engine light is not on and there are no pending codes.
have the same problem?
Thursday, July 23rd, 2015 AT 12:08 PM