beerhunter
Member
- Joined
- Aug 21, 2017
- Messages
- 122
- Reaction score
- 22
- Points
- 18
- Vehicle Year
- 1986
- Make / Model
- Ford Ranger
- Engine Type
- 2.9 V6
- Transmission
- Manual
- 2WD / 4WD
- 4WD
Hi all
Having had an enforced and unwelcome break from playing with my truck, I'm now back on it.
It idles erratically. I have replaced the IAC, leaky fuel pressure regulator, fuel filter, and 02 sensor.
I disconnected the SPOUT, and set the timing to 10 degrees before. Interestingly (to me, at any rate), with the SPOUT disconnected, the timing mark held steady. However, when I re-connected the SPOUT, the surging recommenced, and the timing mark started jumping around.
I appreciate that the timing is supposed to advance when the computer is reconnected, but leaping around back and forth surely isn't?
Does this suggest that the TFI is therefore bad? Or does pulling the SPOUT kill the signal from all the other sensors, e.g. the TPS?
I think the temp sensor must be OK, as it idles approx. 1200 when cold, but drops to approx. 850 when warm (albeit with the annoying surge, which happens cold and warm).
Much obliged to you all.
p.s. I tested for a vacuum leak by disconnecting the lead from the IAC, and the engine instantly died - so presumably no air leaks
Having had an enforced and unwelcome break from playing with my truck, I'm now back on it.
It idles erratically. I have replaced the IAC, leaky fuel pressure regulator, fuel filter, and 02 sensor.
I disconnected the SPOUT, and set the timing to 10 degrees before. Interestingly (to me, at any rate), with the SPOUT disconnected, the timing mark held steady. However, when I re-connected the SPOUT, the surging recommenced, and the timing mark started jumping around.
I appreciate that the timing is supposed to advance when the computer is reconnected, but leaping around back and forth surely isn't?
Does this suggest that the TFI is therefore bad? Or does pulling the SPOUT kill the signal from all the other sensors, e.g. the TPS?
I think the temp sensor must be OK, as it idles approx. 1200 when cold, but drops to approx. 850 when warm (albeit with the annoying surge, which happens cold and warm).
Much obliged to you all.
p.s. I tested for a vacuum leak by disconnecting the lead from the IAC, and the engine instantly died - so presumably no air leaks
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