So I'm new...hi.
Anyway, I've looked everywhere and can't find a post with my specific problem. The truck runs and idles fine (well idles at about 1200) but anyway if I'm driving and accelerate slowly, no issue. It's the 3vze. And has 211,300. But once I try and give it more gas if I'm under 2000rpm the truck will buck a little. Transmission was just rebuilt.. And I have no other issues. It has no CEL but it does have a code 14 which I know is the ignition to Ecu code... Thoughts?

 

Since you have a code 14, you should probably start there. First thing to do is to pull the EFI fuse for 30 seconds to clear all codes. That code 14 could be left over from a long time ago. If it comes back, the problem must be intermittient. Otherwise the engine wouldn't run at all if the IGF signal was permanently missing. The ECU shuts down the injectors if it doesn't get that signal from the igniter. Check the wiring carefully between the igniter and the ECU.

Your stumbling could also indicate a TPS problem. The primary purpose of the TPS is to give the ECU early notice of throttle position changes, so that the ECU can be ready for the upcoming changes in air flow. If you have a dead spot on the TPS, the ECU doesn't get that early warning and the engine stumbles instead. The faster you move the throttle, the more important a working TPS is. The FSM stickied at the top of this forum has a good section on TPS diagnostics and adjustment. Perform those tests. Particularly pay attention to your meter readings as you slowly sweep the throttle from fully closed to fully open (engine off). The resistance change should be smooth, with no jumps or dead spots.

 

Will do thanks!

 

If you have the automatic transmission (the A340H), you can have the transmission do this test for you! http://personal.utulsa.edu/~nathan-b...34electron.pdf (AT-128) I like this test because a) It's an end-to-end test, showing you what the ECU SEES, not just what the TPS is trying to send, and b) on the 3VZE the terminals of the TPS are pretty darned hard to get to.

If the TT-E1 test doesn't look right, you probably need to run the regular test on the TPS.

 

Thanks, but it's a 5 spd.