Ford F-150 (2004-2008) :: All Of Gauges Peg To The Left And Sort Of Tremble After Starting Engine
Nov 30, 2011
2004 F150, 4.6 V8. I'm wondering if my engine control module is going bad.
A few weeks ago I got into it in the morning, turned the ignition on, gauges responded as expected, warning lights on, etc. After starting the engine, all of the gauges peg to the left, and sort of "tremble", as if they were trying to keep going past the stop. After 5 seconds or so, they move up normally. This happens every time I start it now.
Since this weird gauge behavior started I have had to disconnect the battery to clean the negative terminal. After reconnecting it started experiencing idle problems. It idles smoothly, hitting on all 8, but it wavers. I found instructions in the owners manual for "relearning the idle and fuel trim strategy". It's been a over a week since doing this, and it still wavers and throws a P0506 error periodically, which I have been clearing. Twice while coasting the tachometer has jumped up to around 2000 rpm and the engine cut off, like maybe it thought the engine revved and closed the throttle to "slow it down".
My question is, have I just not waited long enough for it to re-learn to idle, or is it possible the engine control module is starting to fail?
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Recently I've been having some intermittent trouble starting my 2008 Chevy Equinox LS. The problem only occurs when I leave my daughter's daycare after dropping her off in the morning...so it's the second start of the day, after about a 5 minute drive. All other times the car starts fine. Here's a rundown of the symptoms:
-May 9th or 10th: I tried starting the car (at the daycare) and the engine made sort of a buzzer sound, and didn't start. Then, after a few seconds, I tried it again and it started right up.
-May 11th: I did some interstate driving (about a 1.5 hour trip each way). On the trip up, after about an hour or so, I received the following warnings: "Service Traction Control" and "Service Stabilitrack." After I turned off the car the warnings have never come back on (don't know if this is related to the starting problem, but figured I would mention it).
-May 18th: while sitting at a stoplight, the car was idling roughly - I had to really hold down the brake to prevent the car from lurching forward, and the RPMs were going between about 800 and 1500...haven't noticed any rough idling since, though.
-May 20-24 & 27-29: Again, when leaving the daycare in the morning, when I try to start the car, it sounds like a machine gun. It usually won't start the first time, but will the second time after still making that noise. Attached is a video of this. The odd thing, though, is that it hasn't done it the last two times I've left the daycare (I doubt the problem just fixed itself).
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The battery light came on in my '04 F150 a couple of days ago. Terminals were in need of cleaning, so I took care of that. The next day after driving 50 miles to and from work, the battery light came on again, along with the ABS & Brake light started flashing. After shutting the truck off, it would not start.
Three days later, I have now installed a brand new alternator and battery, only to have the same symptoms pop up about one minute after start up. The warning lights are now accompanied by the passenger airbag light and all engine instruments needle sweep back and forth. Dash lights go dim and bright intermittently as RPM varies.
Do I need old fault codes cleared or is this a PCM issue?
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What happens if you let it tick away and don't fix it? Beside the noise, what can happen? Will they actually break? Freeze up in the wrong spot and shove a valve into a piston?
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Quick truck stats: 2005 F150, 5.4L, 85,000 miles
The past few weeks my engine has been hesitating on some cranks before it would start. I figured it was due to the cold weather so didn't pay too much attention to it as it was also not throwing the check engine light.
Yesterday it didn't start at all after the several attempts of just cranking over and over. It still didn't seem to trip the check engine light but I pulled my scanner out anyways and it had the code p1237. I cleared it and the truck started right up. It even had no more issues the three times I started the truck after that.
Today, however, she is not starting again and not throwing any codes. Still cranking so I'm sure it's not the started or the battery. I'm going to have my husband pick up some starter fluid on his way home today to see if I can at least get a temporary start since I think it's the fuel pump, or possibly the fuel filter. It is cold again this morning so I'm wondering if the cold is somehow making this issue worse. Either way I'd like to fix it, since being stranded with a truck that doesn't start is not my idea of a way to pass the time.
What else it might be and how I might be able to diagnose it?
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