P0191
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P0191
All of a sudden one day my 2007 F150 5.4L Triton truck wouldn't start. Turned over but no start. Battery went dead so put in a new battery. Now it turns over real nice but still no start. Tow truck took it to the shop, unloaded it from the wrecker and it fired right up. Went to drive the truck into position to look at it and it was "*******", like the fuel pressure was bad. Hooked pressure gauge to it and it's at 32, and 42 when giving it some gas, and the pressure remains good after several hours. He can't find the problem because the truck won't fault again for his computer to find the problem, although it gave him an error code of P0191 (found this code on the first day mind you, but at day 5 still hadn't looked up what that was). Truck died on me 1 year ago and this guy replaced the Fuel Driver module, so it's only 1 year old. He hasn't checked that yet (after 7 friggin' days now) but I assume it can't hurt to check it again. I'm in Wisconsin - a lot of salt and grime. Anyway he doesn't think it's the fuel pump because there's good pressure, and now every time he goes to start it the darn thing fires right up. I'm not a dang mechanic at all but SOMETHING is intermittent and there should be a path of "checks" he could be making to diagnose the problem. About 3 days before this happened I was driving down the road and when I went to accelerate after a stop it bogged down, almost like it was going to stall, then it "caught" again and I didn't have a problem until a couple days after. I assume it could be the rail sensor, or maybe a vacuum leak. He hasn't even checked any voltage anywhere yet. I don't want to have to do his stinkin' job but this is ridiculous!! I don't want to tow it somewhere else and I sure as heck don't want to put unnecessary parts on it.
