Ford Super Duty (1999-2016) :: 2006 6.0 - Tachometer Drops To Zero While Idling And Bounce Up To 200 RPM?
Jan 6, 2010
My tachometer hangs out around the 600 RPM spot when I first start my truck, but lately it will end up dropping to zero when idling, and then bounce up to about the 200 RPM point when accelerating. Its not the Cam Positioning Sensor (I had that happen with my 99 7.3) and this truck runs great. I am thinking it could be at the tach.
Question is: Where does the Tachometer signal generate and does the PCM do anything with it before it sends the signal to the Tachometer? The reason for focusing on the Tach is since the engine runs and idles fine, then that tells me the PCM is receiving the correct signal from the engine and making changes accordingly. I read about a 5.4 gas engine with rain issues, but the only issues going on here is extreme cold (tonight, -15). I keep the truck garaged and when I go out, it is for purpose and then return home to a heated garage.
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While driving today, 2006 Ford F-250 5.4 L V8 138,000 miles , I experienced a problem. Started with the truck acting as if it was running rough, possibly missing. This was approx. 10 Minutes after starting. Checked the dash, no warning indicators and all gauges were normal. Approx. 4 more miles, the oil pressure alarm signals and I see the oil gauge has dropped to zero. I pull over, turn off and check the oil. Oil is clean and at a normal level. I restart the truck and the oil pressure goes back to normal.
Rev the truck up while sitting there and after a few seconds i hear a knocking noise in the engine and oil pressure drops again. Call the tow truck, driver used to be a mechanic . He asks me to start it again and the same thing happens. If you start it and let it idle oil pressure seems to go up to normal with no engine noise. Finally get to the mechanic and he calls me later saying the oil pump and screen may need to be replaced or the engine may need to be replaced.
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I recently bought a 2006 F250 Super Duty, 4X4, 6 liter diesel. My issue is that I have an annoying vibration/bounce between 45 and 50 mph. I thought it may have been a tire out of balance, but even after replacing all 4 tires and rear brake pads the vibration is still there.
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I've been chasing this for longer then i can remember. At 40-45mph the rear end feels like its bouncing. no movement from the steering wheel, just a pulsating bounce. Little information about the truck: Has had Napa Gold shocks, Bilstein 5100s and currently Monroe reflex shocks. Installed readylift 4inch rear block kit about 2 years ago. Had 16x9 rims, currently has factory 16x6.5. Tires are 285/75s. New pads rotors and calipers. It's just driving me nuts to have it bounce all the time.
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I have a 2003 F250 with the 5.4 and I believe I am having a fuel delivery issue. I took out yesterday and stopped to get a drink at the gas station, came back out and the truck wouldn't start long enough to idle. It would start, barely bounce off zero rpms and die out. I checked the fuel interia switch and it was down. I tried turning the key back and forth thinking it might reset the fuel pump or something and that didnt work. I get the truck towed home and couldn't get it to start last night. I go out this morning and it starts, come home from work and now it won't. This happened about 2 years ago and I never did anything about it, but it took 2 years for it to happen again.
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I recently (2 weeks ago) picked up my first Effie, a 2004 RN F250 Supercab XLT 5.4L 4x4 auto (dual Fuel Petrol/ LPG).
One of the things I am exploring is a problem with the tachometer reading high. I read on a thread somewhere on the forum that it was most likely that the earth of the tach plug was not connected. (It was a great thread but I can't seem to relocate it)
I am still chasing a workshop manual to get wiring diagrams, etc. In the mean time, where to locate the said plug/ earth connection?
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Just had a question about my 00 F250 7.3. I recently have noticed that my tachometer needle will not always move the way its supposed to. Sometimes it will sit at zero until I drive it for a min then all of a sudden pops up to where its supposed to be. I also noticed today that while i was driving it just dropped to zero for a second or two then back up to where it was supposed to be again.
When it does this there is no drivability issues with it or idle issues what so ever. Which is strange to me and I cannot seem to put my finger on what could be causing the issue. As I have searched online for a while to no avail as most of the other issues include drivability and idle issues. Also not that it matters but I have recently replace the cps sensor with a new one OEM of course but i don't think that has anything to do with this problem.
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The tach in my 01 F250 PSD has become intermittent. It works properly some of the time, not at all some of the time, and jumps up and down some of the time.
Does it get it's signal from the CPS? It has a blue CPS that's about a year old and the truck runs fine?
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I have a 2002 F-350 with a 7.3 powerstroke. Last week, I replaced both my batteries. When I tried to start the truck, the electronics when a bit crazy. Speedometer and Tachometer swinging back and forth. Then when it did start it ran rough and after a minute it shut off. All electrical functions are completely dead. I finally unhooked the batteries and went in the house to cool off. When I came back, rehooked up the batteries, it started right up and everything acted normal. Everything was normal until last night, it started fine and was idling for about 5 minutes and it shut off. Absolutely, NO electrical power, even tried to jump start and still no electrical activity. Unhooked the batteries waited about 15 minutes, hooked them back up. It started just fine.
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I have a 2001 Ford F250 V10 with about 70,000 miles on it and now the gauge indicates low pressure when my warmed up truck idles around 1000 RPM.
I went off road the other day into some mud and since then I have had my oil pressure gauge reporting low at idle and normal when moving.
I was a quart and 1/2 low on oil which I filled and the next day I changed the oil. I then had taken it Ford shop who replaced the oil sensor and said all fixed. It wasn't and I took it back in ... now the mechanic indicated it is probably the crankshaft bearing based on his experience and I should replace the engine.
This seems drastic? Wouldnt' the next step to go check/replace the oil pump?
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Does this look like a bulb may be burnt out?
It is dark between 5 o'clock on the speedo and 8 o'clock on the tach.
Where are the dash lights and what type are they?
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I have an 05 F250 Super Duty 6.0 V8 Turbo Diesel. This is my first diesel so don't know my way around it too much yet. I just don't know what could cause this problem. It sounds like a faulty sensor to me. But no engine light has come on. My oil pressure drops down to in the red zone when I brake while driving, then once I return to driving again it returns to the normal pressure. It's almost as if it has something to do with the tilt of the vehicle.
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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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So they tell me I have lift assist, but the tailgate drops like a stone and must weigh more than 80lbs! When I asked they told me that was how they worked. Other trucks I've had would drop by themselves smooth and slow...
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Got to work this morning, sitting at idle for a few minutes in parking lot, all of a sudden fuel gauge needle drops to below 'E' and the fuel light comes on and beeps. I know I have at least 1/2 tank of fuel. What would cause this?
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My truck is essentially stock except EGR DELETE. Lately I am seeing my coolant gauge in the cluster drop to zero instantly when the truck is warm. A quick glance to my edge monitor shows my ECT temp fluctuating wildly (but not stone cold) ranging from 65-190'ish degrees. The weird thing is even when it's showing low on the edge, Gauge showing nothing, it kicks my fan in. I would have thought that shouldn't happen because it's still showing a value ( very low yes) but maybe it pops into limp mode?
I am also having other gremlins like driving along all warmed up, come up to a hill and if I back out of the throttle, boost drops to zero and even with holding the pedal to retain the speed I am at, it just drops speed with no boost.. I then have to stomp on it and the boost will ramp back up. It will show something like 85% VGT but zero boost.. Is it normal to show zero boost with 66% vgt at idle in Park with no boost? Getting all sorts of codes lately. The coolant one is very intermittent (every drive several time but not every minute)..
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177,000 miles, fuel pump was replaced just before I purchased it a few weeks ago. Truck has been running like new until today when it started doing this completely out of the blue. If you watch the video, the sound is not off, the tach is moving independently of the sound of the actual revs. Occasionally when doing this, the fuel gauge drops to zero. Thinking this is an electrical issue somewhere.
YouTube.....
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I'm have a 2011 6.7, 180,000. I have noticed a high pitched whistle, not an turbo whine, that disappears after the boost drops to less that the first mark on the gauge 5-10psi??? It stays consistent in tone, the mileage is good, power is good normal 6.7!!.
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We have replaced 4 fuel pumps on a row.
Voltage is good...even ran a fresh circuit.
Ran new supply lines
But, can't seem to understand the continued drop in pressure. It usually takes about a day of driving to crater after a new pump/filter is installed.
It never dies, just loses power and drops the truck to an idle. Funny thing...if I shut the truck off and turn it right back on...full power for a short period!
The truck is used on a ranch that has plenty of rough roads...thought inertia switch maybe but i believe that would stop fuel completely right?
I am totally stumped and so is the mechanic.
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I was wondering if there is a aftermarket product to give my truck a more Rumble when starting and idling.
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I am new to Super Dutys but i love them! Altho mine is not being so nice. It has the 5.4 in it. When its idling it has a stumble to its idle with a pop every now and then out the exhaust. It revs fine when its first started. If i pull out on to the road and start away easy its ok a slight miss but if i put the throttle down its just falls on its face. But if i get it up to cruising speed its ok as well. But even at cruising speed more then 1/8 throttle and it starts missing and falling on its face. What it could be? It smells like its running lean as well.
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