Truck dying- fuel pump? Please help :)
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Ok- just downloaded the datalog from my scan tool from my run last night- LTFT when I got on it went as low as -29%, and saw around 0.100->0.140V when at WOT. Load never got greater than 66%.
By that count, I'd figure it is the fuel pump. With voltage that low, it's leaning way the hell out. At P/T, it was around 0.780V, which is a bit rich.
Another interesting thing- at idle, TPS was reading 15.2%. Is that normal (probably about 1V or so), or is that indicating a bad TPS? Idle (when warm) was about 675 or so, and no vacuum leaks as far as I can tell- Mark W.
By that count, I'd figure it is the fuel pump. With voltage that low, it's leaning way the hell out. At P/T, it was around 0.780V, which is a bit rich.
Another interesting thing- at idle, TPS was reading 15.2%. Is that normal (probably about 1V or so), or is that indicating a bad TPS? Idle (when warm) was about 675 or so, and no vacuum leaks as far as I can tell- Mark W.
Last edited by thaduke2003; 02-21-2009 at 11:12 AM.
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Hah- I know you can't check vacuum with a scan tool, thanks I have vacuum gauges.
Alright- test drove the beast. Once again, O2V was reading as low as 0.060V under WOT. Whacked the tank with a rubber mallet a few good times, not much change.
My next question is, is there any difference between buying an Airtex pump from Autozone, say, than OEM? Are they made by the same people, as they often are? Thanks, Mark W.
Alright- test drove the beast. Once again, O2V was reading as low as 0.060V under WOT. Whacked the tank with a rubber mallet a few good times, not much change.
My next question is, is there any difference between buying an Airtex pump from Autozone, say, than OEM? Are they made by the same people, as they often are? Thanks, Mark W.
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