ECU - P1691 Code...HELP!
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From: Houston, TX
ECU - P1691 Code...HELP!
I have done the search on the code and found the description - "Detected error in the fuel injector pump calibration".
Here's the rest of the story;
On my way to work this morning, truck running fine. All of a sudden, dead as a door nail. Pulled in a parking lot. Cycle key switch, all is good (lights, buzzers, FASS turns on, etc...). Tried to start and it only cranked. Sat for a minute, then tried to remember how to access codes. Cycled ign switch several times (couldn't remember how to access codes). Sat for another minute, tried to start and truck started and ran fine. Drove to work, with a couple of minor stumbles in deceleration, but overall, truck seemed to run fine. Just drove to Autozone to have it scanned, and still only showing P1691 (and P1693). Truck seems to be running perfect!!
My question is, is this a glitch, or is the VP44 going out? Will it act like this until repaired, or is it going to totally quit? I'm the third owner and to the best of my knowledge the VP44 was replaced at approx. 75K, truck now has 134K. I do have a FASS w/gauge, and have maintained at least 14 psi since installation of FASS.
Thanks in advance for any help!
Here's the rest of the story;
On my way to work this morning, truck running fine. All of a sudden, dead as a door nail. Pulled in a parking lot. Cycle key switch, all is good (lights, buzzers, FASS turns on, etc...). Tried to start and it only cranked. Sat for a minute, then tried to remember how to access codes. Cycled ign switch several times (couldn't remember how to access codes). Sat for another minute, tried to start and truck started and ran fine. Drove to work, with a couple of minor stumbles in deceleration, but overall, truck seemed to run fine. Just drove to Autozone to have it scanned, and still only showing P1691 (and P1693). Truck seems to be running perfect!!
My question is, is this a glitch, or is the VP44 going out? Will it act like this until repaired, or is it going to totally quit? I'm the third owner and to the best of my knowledge the VP44 was replaced at approx. 75K, truck now has 134K. I do have a FASS w/gauge, and have maintained at least 14 psi since installation of FASS.
Thanks in advance for any help!
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Joined: Oct 2007
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From: el paso Tx
mine quit for a while after resetting it but it came bake eventually, i got code p1688 after it completely died, check your batteries and connections, had a buddy that this happened to and thats all it was, my luck with those codes wasnt good, my truck had 140k and i went through 3 vp44 pumps and 2 lift pumps in six months before i got rid of it due to that, me and 2nd gen 24 valves arent friends we are enimies lol
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Joined: Dec 2006
Posts: 89
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From: Houston, TX
Thanks Guys!
Funny thing, on the way home from work yesterday the truck seemed to be running better than it ever has!!
I was doing some more searching in here and found a couple of threads indicating a communication error from the Quadzilla XZT??? Possibly a glitch there? Truck is just running so good it's hard to imagine the pump is failing!?!?
Funny thing, on the way home from work yesterday the truck seemed to be running better than it ever has!!
I was doing some more searching in here and found a couple of threads indicating a communication error from the Quadzilla XZT??? Possibly a glitch there? Truck is just running so good it's hard to imagine the pump is failing!?!?
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