Ford 7.3L Power Stroke (1999-2003) :: Zero Flow At Idle And Dribble At About 1300 RPMs And Increase
Dec 18, 2016
I just flushed my coolant system and installed a red ELC, Riffraff billet thermo housing, Ford thermostat, new hoses and Riffraff coolant filter. When I first started the truck and was waiting for the thermostat to open I notice at idle the flow from the coolant filter into the Degas bottle was a lot.
Fast forward a week and about 75 miles I have zero flow at idle and it will start to dribble at about 1300 RPM's and increase from there. It seems the flow would not be dependent of the thermostat being open since the connection is below it. I am wondering if my Donaldson filter is already full?
I used a flusher that uses air and water, after flushing I used air to blow to tap water out. How fast have you guys seen one fill up? I ordered 2 extra but just do not want to waste the first one
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I have a 2003 Ford Musang 3.8L v6 when I start my car for the first time of the day or after several hours of sitting the car idles high between 1000-1300 RPMs for approximately 15-20 seconds after that it idles down to 600-800 rpms. I changed the spark plugs wires air filter not sure what else it could be no Check engine light.
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My '03 7.3 is "surging" on idle. When warmed up, and idling, the RPMs will drop by 300 or 400 for a few seconds and then will correct and shoot back up. It cycles like this (every 5 seconds-ish) continually . I just put in a new IDM and checked the UVCH - is there a separate idle control mechanism that I need to have a look at? (2003, 7.3, 214K, stock).
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So my 11' F350 is over heating when the engine RPM's are below about 1300 whether the truck is moving or not. If I let it idle for 2-5 minutes I can watch the temp gauge go to red and an engine over temp message appears. I noticed that if I rev the engine to > 1300 RPM it cools back down.
This appears to be a water pump going bad, any other thoughts? Are there instructions for changing the water pump here on the forum?
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Recently I have noticed that when on a tune other than stock I am getting a surge at idle - my RPMs drop to around 621-630 then shoot back up to 660-675. On my stock tune my RPMs stay around 640-667 and don't cause the surge (felt as a shimmy so to speak). Is there anything else that causes a similar symptom? I attribute it to tuning due to it only happening when running anything but stock but could be wrong.
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My f350 has 300k on it. 95% of its driving is on trips of 22 miles or more at highway speeds. Occasionally long trips (going to put on 3k miles in 8 days here soon)
Want to drive the truck to 500k miles...but wondering if a tune or a chip would change the mpgs and not hurt reliability? I know its not a Honda Civic...I am not looking for 35mpg....would love to pick up a couple more than I have.
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I am having trouble with my 1999 F350 Ford Powerstroke, Looses power but the motor never quits and also starts up fine, will set and run and warm up on the coldest morningIdles fine, It will hold back sometimes and not increase speed. I can take it out today and it may be fine and tomorrow can't run 2 miles. I was thinking CPS but after reading information I am not sure. What may be causing this issue. I just put a High Pressure oil pump on it could this have anything to do with it. Was not having a problem before the pump was changed. The pickup has 190,000 on it actual miles.
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Have a 2001 wolfs-burg 1.8t, has about 220k miles on it, i know, its a lot. Right now, the check engine light has been on for a few months and the idle is very weird. It goes up and down in neutral from 800-1300 rpms and sometimes i smell gas. Also the triangle with an '!' and circle around it yellow light comes on some times now. I heard it could be MAF or a vacuum leak. A mechanic is going to check it out soon...
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I don't have ready access to my truck and I'm trying to buy new cooling parts when I rip out/replace my transmission. I searched the forum but can't find the simple answer I'm looking for regarding the route of the transmission fluid for cooling.
In my 2001, I thought the fluid comes out of the transmission to the radiator, then back to the transmission from last time I was looking at it underneath. But in the forum, it sounds the fluid would come out of the radiator and then into the air cooler in front of the radiator before back to the transmission.
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IPR CF2 Byasss High Flow Coolant Filter Ford 6.0
Made for the 6.0, the biggest problem on the 7.3 might be finding real estate for the filter assembly.
One review refers to using it on a 7.3.
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So I had this issue with my idling at 1300 rpms but every now and then it would idle at 400 and barley run then one day it didnt want to idle at all so I checked the iac and it was bad so I changed my oil, fuel filter, iac, cleaned my throttle body, fixed a vacuum hose, and cleaned my air filter.
When I started it it idle at 2200 I drove it a little and it dropped down to 1300 the next day I started it and it idled at 800 and staid there for four days now it idles at 2000 then will drop down and surge between 1300 and 1800.
I read that the oil you apply to the filter can contaminate the Maf and you should clean it but a lot of people said the one on a vr4 can't be cleaned while others say it fine. Is there a way to check the maf?
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So I just purchased my first diesel a couple weeks ago (2003 f250 Lariat). I love it! However, I'm having concerns about my turbo whistle on it. At idle and while in higher RPMs is sounds ridiculously loud (even at 0 PSI in the boost). I've been doing my research on it and I know the 03's have the loudest sounding turbos because they have less vanes than the later models. I know without a video it's going to be hard to diagnose, but I am wondering if a loose boot would cause a turbo whining sound through the exhaust? I have yet to hear ANY other diesel in person that has a turbo whine as loud as mine.
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Well I was fueling the truck today and I opened to hood to check it out and noticed that there was no pressure in the cooling system by squeezing the upper hose. I did have a spare degas bottle cap and removed the old one slowly and replaced. I have been driving over 30 minutes and it is close to 100 degrees.
I then drove on down the road, the truck is not getting hot. I stopped to look at some running boards and the truck was running and then I came home and still no pressure, the truck is still running, I removed the cap and no pressure, I then removed the small hose going to the top of the degas tank and no coolant came out. I turned the truck off and disconnected the upper hose and some coolant did come out.
Is this normal? The truck runs just fine, just has me worried. I just bought the truck and the previous owner recently replaced the water pump, T-stat, hoses, etc. All parts were bought at O'Reilly. So everything looks good.
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Have to get rpm's over 2k before trans will engage, then in between shifts I either have to let off throttle or let engine rev over 2k to get trans to shift...
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Was driving to work about 4 miles into my travel rolled around corned and she died..... tow bill and cps she fired rite up. Ran at idle in drive way because I was a little leary for about an hour left drive way went 2 miles went to pull in to store died again. Another tow bill and 2 more cps still won't start rpm is only like 200 when cranking but sounds like a lot more. The wts light works, batteries are pretty new, cps in new...
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Have a 2003 F-250 with 174,000 miles. Recently replaced CPS and ICP and it's running much better. It normally idles at about 700 rpm. Lately, after driving for any distance above ~40mph, when I come to a stop, the rpm won't drop below about 850 rpm. If I shift to neutral (automatic trans), the idle drops to around 700. At the next stop sign/light, it's back up to around 850.
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I noticed on 5 different occasions so far this year that my idle speed will increase to around 1100 rpms when sitting at idle for more than a few min. Last summer it did it while running a/c, and today it did it with cold weather. The rpms are usually at 550, what happens is the pcm will decide to increase idle speed for no reason at all. Start driving it, and the next time at idle it will stop doing it, a couple times it went down to 550rpms, then went back up to 1100rpms. I recently changed the spark plugs, the air filter is clean, and runs good. I have a code scanner, no pending codes. I have 53k miles. I wonder what could cause this?
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I recently purchased a used Camry XLE V6 with 90,000km on the engine. Soon after I bought it I noticed when I was stopped at a light the engine rpm's would increase for a few seconds at a time every 20 seconds or so. It was enough to make the car move forward slightly if my foot was on the brake lightly. I spent some time trying to re-create it at home, and it seems to do it consistently when the A/C is on, although some times it is more noticeable than others. It will do it when in park, or in drive with the brake on. The low (base) rpm is around 650 and it will increase to 950. It does this over and over as long as the AC is on. The rpm's will also increase if I turn the steering wheel when I am at a stop, but it only does it when I turn the wheel, it doesn't keep cycling. There are no check engine lights showing either.
I changed the air filter and cleaned the throttle body butterfly valve flap (not the entire throttle body) but it did not fix it. I also brought it to a Toyota dealer and they took it for a drive, but of course it did not show the systems as clearly that day. I didn't book an actual appointment with the mechanic though, since the car is running great otherwise and this problem is not bad enough to start throwing money at it doing problem solving. I also asked the guy I bought it from and he said it always did this from day one. If it were me I would have been making my dealer resolve it because it is not normal.
If I could fix this one very annoying issue the car would be perfect. I'm not sure if I need to do a full throttle body cleaning including the idle air control valve, or if this is more about the load on the engine and the way the computer/engine is responding to it.
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If I could determine the resistance of the accelerator pedal at around 1000 rpms, couldn't I rig up that resistance and switch it on in the accelerator pedal circuit to make the truck go to high idle? Any flaws in my thinking?
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RPM's are dropping way off when coasting downhill while towing (as if the motor shut down), CC is on and maintaining desired speed. When at the bottom of the hill, all of a sudden, with a big bang(in the motor) the rpm's have came back up and you drive on down the road as normal. This seems to happen only when towing. "99 F250 7.3 I haven't pulled any codes as of yet. Whats happening?
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Ill start off with my mods and recent maintenance things I have done before fully describing the issue.
E99 7.3l with 190k on the clock
Full 5" turbo back
TS-6 chip
EGT, Boost and trans temp gauge
New ford glow plugs
Re-orings injectors
new valve cover gaskets
new fuel filter and fuel lines
new turbo with a ww2
Newer trans and oil pan
I think that should do it, now for my problem. The truck starts good cranks over once and is running with no hesitation, the engine run a little rough, more than normal vibration at idle almost like a small miss. No smoke at idle.
While driving with no/little load on the engine runs great , but under load there is a good amount of white smoke/ oil smell. The turbo is new and is not leaking oil I have already checked over that and the exhaust is new but there is some oil that is at the tail pipe in liquid form. The exhaust up pipe that goes to the turbo is not covered in oil either
The truck cruising in OD or in 3rd with O/D off around 2k rpms it shudders real bad almost like the truck is going to shake its self apart. but at like 2400 rpms and above its fine. Where is a good place to start the diagnosis as I am pretty new to the Diesel world. From what I've read it looks to be either rings are junk or maybe I have some bad injectors (thats what it feels like to me) but would that cause it to smoke like crazy?
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