Ford Super Duty (1999-2016) :: Inconsistent Idle When Sitting At A Red Light
Apr 26, 2017
I have a 2016 F-350 with the 6.7L diesel in it. Truck has 10,000 miles on it now.
Since about 3 days now it's giving me grief at idle, e.g. sitting at a red light. The idle is very inconsistent, I can see it on the gauge and you can also hear it rev up then slow down. When the idle rpms drop down (below the 500rpm mark) the whole truck shakes for a second then the rpms come back up. then drop down, back up,... and so on. It does it regardless of gear, it's more pronounced even in P or N.
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I was sitting at a red light and accidentally let out on clutch and stalled truck. The clutch petal hit the floor and I had to pull out of gear. Petal will come back up if you get it started up with foot but cannot change gears when running. Changes thru gears easy when not running.
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07 f250 has a shimmy from the rear at highway speed. Has new tires is worse with a load. What am I missing here?
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I just bought myself a 2003 F250 XLT with the V10 in it. Low miles, not beat, 6 speed, very happy with it. I noticed today that there was an inconsistent tapping coming from the passenger side valve cover. I searched online and was pointed towards the PCV baffle. I pulled the breather hose off and stuck my finger in the hole, and the baffle is indeed detached. Now I know that I need to pull the valve cover now to at least remove the baffle; is there anyway to reattach the baffle, or do I need to buy a new valve cover?
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My battery on my 2008 SD goes down sometimes after the truck has been setting for a few days. This doesn't happen very often, and I've checked to see if I left something on that could have put a draw on it. I can find nothing that has caused it. I jump it off and might go a month before it happens again. I've got an add-on voltmeter that show voltage when the switch is on, and it's charging perfect. On older trucks, I would simply put a test light between the positive post and the cable and checked for a draw, but on the later model there is always a slight draw to keep memories alive.
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My truck has been sitting more lately, which means up to a week without starting and running. Each time this happens I run into a dead battery. And I mean dead. I've charged it fully and then used the truck no problem.
We did a test where we unhooked the negative terminal wiring clamp and ran a meter to check for amp draw. We did this by touching the meter leads to the negative post clamp (unhooked) and to the negative post on the battery. It gives a reading of ~1.5 amps. Trying to figure out where the drain might be.
Otherwise, we'll jut pull each fuse to see if we find the electrical area drawing the amps.
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This is an update on an older post I took the truck to a repair shop and had it checked. They said 5 of the 8 glow plugs were not working and #3 injector was bad.. They replaced all glow plugs and the #3 injector I brought the truck home and parked it about a 20 mile drive home running fine when I got home. When I started it the next afternoon it was missing just as bad as before the work was done. After it gets warm runs ok best I can tell. What it could be? If the orings on the injectors are bad would it run ok when it warms up? Going to take it back to shop but not sure they know whats wrong by the way the mechanic talked. What to do next they have checked the wiring or at least said he did. It does ok when the oil warms up new hpop and I have checked the oil level and it was ok the hpop and eng. What else to do?
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We have a 2008 f250 super duty with the 5.4 triton well ever since I replaced the power steering pump its been running raggedly, it idles rough and when i get up to 50, 55, 60 the check engine light comes on i put a diagnostic reader on it and said something along the lines of ECU bank 1 an Bank 2. What that is and I've been a mechanic for almost 3 years.
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I have a 2013 F550, v10. At idle, the oil pressure gauge drops and the red oil light comes on. If I hit the gas, the gauge pops back up. I swapped out the oil pressure switch. That didn't fix the problem.
I thought maybe the gauge was faulty, so I bought a 2 inch mechanical oil pressure gauge and hooked that up, leaving the factory gauge disconnected.
I watched the oil pressure start around 50 psi cold, and it slowly fell to 10-15 psi as it warmed up. The truck has 65k miles on it. There is no knocking, no ticking, no loss of performance.
I cannot imagine that at 65k miles, that it would be a worn engine. Right??
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2001 f350 v10, initial problem was when i came to stop at light it idled rough. I changed all plugs,injectors and COP, and bad connectors thereto. Changed the clock spring as well. Now the truck idles like crap at first start of of the day then run fine there after. Replaced IAC, TPS, Temp sensor. Condition getting worse and now the temp gauge does not work. I am thinking maybe CAT Converter loaded up?
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So my truck drove great to ocean city MD this weekend. Power is perfect again, feels really tight. But now I have having to additional problems.
1) My alt light had been flickering a couples times a month. Last night it came on and stayed on. Lots of threads about this I Know!
I am hoping that cleaning and tightening the connections will do the trick since the alt is a Bosch with only 25k miles or so. But I want to order a rebuild kit:
is my alt a 3G or a 3G8429?
F SERIES | Alternator Starter Rebuild Kits
2) I started to have a ticking at idle. Its very regular and sounds like its coming from the passenger side valve cover. In random threads I have read about timing chain guides breaking and loose rocker arms.
Most of the time its 3 ticks in a row and then a pause. Should I be pulling the valve cover? Think I need to R&R the timing chain? I will post a video later!
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I noticed my 16 ccsb 4WD lariat 6.2 was slightly leaning to one side in a parking lot yesterday. My driveway at home is dirt and far from level so I would never notice at home. So before I pulled out of the parking spot I got my tape measure out. I've got 41.5 inches from ground to top of wheel well on the drivers side rear. On the passenger side rear I've got 42.25 inches from ground to top of wheel well.
So darn it the truck is 3/4 inch leaning to the driver side. Is this normal? I can understand it not being exact to the millimeter however 3/4 inch seems to me like a lot of tolerance. The bed was empty when i measured and Air pressure in both rear tires is 70psi. I did pull a load with about 2,000 pounds tongue weight the other day however that shouldn't make any difference.
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The last couple weeks my excursion had started to have a stumble and smoke white ate the first startup or after I let it sit for a long time. I did get progressively worse. I noticed the hpop line to the driver side head was leaking from the fitting so I rebuilt the boss fitting and now it's not leaking but when I started it up this morning it did the same thing.
If I give it throttle it clears up pretty quickly but if I let it just idle it will put white for probably 5 minutes. I have no codes showing when I looked with the scanner I don't see any other oil leaks and I don't smell a fuel leak.
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Within the last few weeks my super duty battery has been dead after sitting a few days. Draw is around 80 ma. When I pull the air bag fuse it drops to 10 ma. Before I tear in to this thing need to know where to start.
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Im having an issue with my 2000 f250 7.3 diesel. 4x4. The od light is flashing and the tranny is kind of jerky when it shifts. Also my truck won't go into 4 low. (I have shift on the fly) and every time I put it in park my truck revs up to 2000 rpm for a few seconds. I do have a ts 6 pos. Chip with can tunes on it. And I have already replaced the IPR. It does it even in stock setting.
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2001 Ford F350 V10, 220K in crap condition
First of all on the left side 2 of the coils were so withered the rubber separated from the bolt and were loose. Without any tools I was able to remove 2 coils. Typically there is the hole and several inches inside hole is where the spark plug sits.
On cylinder 4 the spark plug is on a funny angle and is level with the hole or possibly poking up above the hole. Tried sticking the ignition coil over the spark plug but it wasn't correct. Leaving it alone until my cousin can take a look. Spark plug was tight but I didn't put a ratchet on it.
Wondering, is this the infamous spark plug blew threw the cylinder thing. Wish I would have taken a picture (I will next time I'm with truck).
Had codes for misfires on 4 cylinders but that was with 2 coils unplugged (way I got truck at auction)....I replaced 3 of them (1/2/6).Cleared codes...4th cylinder remained unplugged....And the only code I got after letting truck idle for 10 minutes was something about ignition coil D (which would line up with cylinder 4 I think).
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Having problems with a slow drain on batteries? My truck wouldn't start after sitting for 5 days.
After recharging and starting it up once, I pulled the key, and disconnected the battery harness and checked for current on all the red wires in the harness. Only one drew current. I found the small red wire on the drivers side initially draws 470mA for 1 minute, then draws 22mA. In my experience in mobile audio, 22mA can drain a battery over several days.
Has anyone out there checked their 'dark current' draw? I have chased it all over and checked all the aftermarket add-ons and it comes down to something in the factory dash.
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I have a 2003, F250 SD, 5.0 with a weird problem no one can figure out. Now it doesn't matter what time of the year it is but after the truck sits a few days when I go to start it up it run roughs. Sometimes for a few seconds sometimes a few minutes then it "straightens" itself out. Recently it took almost a day to fix itself. No engine codes, no other symptoms.
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My excursion suddenly lost power after sitting in a long traffic jam. I have a scan gauge II set up and didn't see any signs of over heating however when I went to accelerate back up to highway speed my motor revved up to 3000 rpm and just lost power I ended creeping on the side of the road at about 15 mph and barely maintaining that. The motor was not willing to revv up. I reached a spot to pull over and shut it down for about 15 minutes and started back up and drove off with no noticable issues. I have 211,000 miles on this motor and I am going to change my coil packs, I think they have been there since the truck was sold new....I changed four of them to address a miss and have six left, I will also be changing my fuel filter. We are about to pull our camper across country....about 1400 miles..
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I have a 2002 f350 5.4l that has stalling issues, first some back round. Last week I pulled up the a stop light and the truck stalled I figured it was a iced fuel line as it was very cold so I put a bottle of drygas in the tank. Evidently there was a lot of moister in there because as soon as I started the truck check engine light came on and truck would not idle at all. I got through that tank and am now on my second tank. It is better but the truck will still stall when stopped at light (has never stalled in park or on the road only while stopped in drive) the check engine also light went off halfway through the first tank. What next?
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I have a F350 diesel which has recently had a new AC compressor, Now when I go to stop at a stop sign or slow down using brakes the wipers come on and swipe a time or two. I never noticed this before the new compressor was installed so I was wondering if something might have happened while installing compressor? Now I think stepping on the brakes makes the wipers come on, but not until the truck slows down and is just idling.
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