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).
View 14 RepliesRecently 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.
View 2 RepliesHave 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.
View 11 Repliesthe wife's '01 Excursion has developed a new idling quirk. While sitting, it will briefly drop rpm's. You can hear it, and see it on the tach gauge. No other noises or problems, except for the brief drop in rpm's.
View 3 Replies2003 7.3 excursion.. The truck starts every time revs up and idles about 3 seconds then the rpms drop and it tries to stall out catches itself then revs backup and idles rough similar to if you have got air in the fuel lines from changing the fuel filter.. About 1 in five times the truck will stall out and it starts and immediately and idles rough but the rpms and everything runs at speed and rpms don't drop again! This is a reman engine/transmission recently installed.. The mechanic who installed it was unable to figure the problem out.
View 6 RepliesI ran out and test drove a new to me 2001 F350 7.3L tonight. Everything seemed good, until I got back from the test drive. I pulled in and was sitting there with it idling. It seemed to idle fine, then a very small miss and very small shimmy then idle fine again; then another small miss and another shimmy. It continued like clockwork. Every time it seemed to miss and shimmy, the RPM would drop just a little, but not much. Does an ICP sensor sound like the problem, or maybe something more serious? 2001 F350 7.3L with 235,733 miles new trans, turbo replaced at 150,000 something miles. No blow by. Idled fine before driving, also drove fine. It doesn't seem to surge when idling, just kind stalls and shimmys for a split second then idles fine for a few seconds.
View 1 RepliesI have an early 99 F-350 with 268K miles. It is bone stock right down to the factory exhaust. A couple months ago I started have a rough idle and surging while driving problem. I never got a check engine light but I borrowed a scan tool from a friend and pulled the following codes: P1690 (wastegate solenoid), P0381 (glow plug circuit malfunction), P0269 Cylinder 3 Contribution/Balance Fault, and P0284 Cylinder 8 Contribution/Balance Fault.
I did some research and everything I read said it was most likely the CPS. So I changed the CPS. The truck ran fine for for a few days but then it started acting up again occasionally. I noticed that most of the time when it acted up was at start up when the engine was cold and I also figured out that if I shut the truck off and re-started it (sometimes I had to do it 2 or 3 times) it would clear up and run normal.
A buddy of mine that has a 2000 F-250 said he had a similar problem with his truck and it ended up being the ICP sensor. We switched his ICP with mine and I changed my oil at the same time (because it was due for an oil change). My truck ran flawless for over 2-weeks (over 200 miles) so I put a new ICP in my truck. Note: my buddy did not experience any problems with his truck with my ICP in it.
I've put about 700 miles on the new IPR and the truck has started to act up again. Once again shutting the truck off & re-starting it will clear it up and still no check engine light. I took it to a local "diesel specialty shop" while it was running rough and they hooked it to their scanner and got P1280 (Inj. Control Pressure Low), P1690 (Wastegate Solenoid Fault), P0381 (Glow Plug Indicator), P0269 Cylinder 3 Contribution / Balance Fault, and P0284 Cylinder 8 Contribution / Balance Fault.
They never did anything other than hook it to a machine & check the codes but their diagnosis is my High Pressure Oil Pump is going bad and my #3 and #8 injectors are going bad. They recommended I let them replace all 8 injectors and the High Pressure Oil Pump. The problem I have is they can't give me a REASONABLE explanation as to why re-starting the truck a few times clears up the problem.
2000 f350 CCLB SRW 176,000. I have a touchy accelerator. About two weeks ago the CEL came on and it wouldn't do anything but idle for about 20-30 sec then fine. Then it got a little worse. I disconnected the two harnesses on the accelerator pedal and sprayed them with electrical cleaner. Put it back together and it seemed to be ok. Today the pedal is real sensitive. Sometimes bogging down other times accelerating real high even tho my foot is pretty consistent and gradually accelerating. No CEL tho. Do you think I am in for a new pedal assembly? Could it be something else? UVCH?
View 13 RepliesI've developed a problem, usually when starting, that the truck will crank over, start and idle for a few seconds and then shut off. The few seconds it idles it doesn't get any throttle input. I'll crank it back over taking a little more than usual to get it started. When it does start it seems slightly sluggish but that quickly, like almost immediately goes away and the throttle is working again.
Oh, 2001, 7.3 stock w/200k
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
I have an issue with my 7.3.... the truck will not start if it sits overnight without being plugged in, even in 65 degree weather. It starts and runs with a rough idle for about 10 seconds after its been plugged in for an hour, after the rough idle is gone it runs great .. it will Stat back up as long as the truck is warm (70+).... I've replaced the batteries, glow plugs, starter (it was going bad) and fuel filter. .. also replaced the gpr today. ....
View 14 RepliesThis applies to a 2001 F-350 with 73,000 miles on the engine. Engine oil level is good, batteries charged, HPOP reservoir is full and passes Cody test with flying colors. Fuel pump runs for 20 seconds at key on. Start takes about 6 seconds. If I shut the key off and restart immediately it starts in under 2 seconds but if I wait about 30 seconds it's a 6 second start. Here is an AE that I ran on it, it has me stumped. FWIW it seems to start quicker when AE is hooked up. ?? An odd whir type of noise comes out from somewhere under the hood when I first turn the key on and when I clear the codes with AE.
View 14 RepliesI have a late '99. It's been weak all summer. Took it to the dealership. They put it on the computer and said the only problem was bad injectors. Specifically #8. I replaced them all. It's still weak and now is starting to surge going down the road. I have my suspicions but I'm not a mechanic.
View 14 RepliesI have a '01 7.3 Excursion 2WD. 220,000 miles. It has a 4" exhaust, K&N filter and Edge Reprogrammer set on emission illegal. It gets the best fuel economy and moves out very well for 8000 lbs. Recently, I started to feel a surge while making light throttle acceleration. For example, round a corner at 35 and try to gently resume the 45 Speed limit. It begins to accelerate and then cuts out or surges, sometimes several times. If I lay into it, it responds fine. I have serviced the air filter, the fuel filter, use synthetic Amsoil. I did notice a slight improvement after the service. Less frequent cutting out or surging. I also was in an area where Bio diesel is readily available. I added almost a full tank of B10 Bio and it seemed to work. Changed the fuel filter just after.
It has been cold for NC. This morning it was +14 when I started the truck. It seemed to finally catch on maybe 2 cylinders with lots o' white/ blue smoke. It cleared out in a few minutes and seemed to be hitting on all 8, or at least 7. Once it warmed up, it's fine. But I had the codes p0672, p0674, p0676, p0678. My question is: Is there a common thread in the fact that it appears that I lost 4 glow plugs on the same bank?
One arm chair quarter back's response to the surging, is that the under valve cover injector wiring harness may be breaking down, especially since the truck has 220,000 and the valve covers have never been off. I have a fresh turbo with the good wheel sitting ready. I have just been too lazy to swap it out. Would a fresh set of injectors be a wise choice, when I swap over?
My truck - early 2000 CC short bed, 300K miles
Background on my problem: I had a short list of long overdue maintenance and updates to do that time and money kept me from tackling. Found a little of both so I replaced the water pump, HPOP lines, re O-ringed the HPOP/IPR, deleted the AIH, replaced all of the brake lines in the engine bay, put new fuel lines to the filter bowl. All of this took me about 2 weeks so the truck sat with the batteries out for that long.
After buttoning it all up, it fired right up, a little slower than normal but figured that was air in the fuel lines, HPOP, etc. The only issue I had was the battery light stayed on. Thinking I had an alternator issue, I checked it and it was getting about 14.25v so figured that was good. I used it regularly for about 3 weeks, the light stayed on, and noticed some surging during warm up and some low rpm hesitation.
Then it stop dead on me driving down the road. Turns out it was all my doing, I had torqued the bolts on the water pump pulley but didn't use Locktite. The bolts backed out, shredded the belt, and ended up yanking the CPS wire harness out of the sensor. So that made total sense.
Fast forward another week, got new wiring pigtail and CPS (never replaced it before now) from a couple of the good FTE vendors. I am not sure about the wiring on the pigtail, my truck has a green, blue and brown/gray wires, the wiring diagram I found online showed green, blue and gray. I wired it connecting the brown/gray where the gray line goes (center contact) and closed everything up.
Another thing to mention is that I have an Edge Juice with Attitude that has been on the truck since '06. I lost that connector in the process and they were absolutely no support in trying to get me running again. Wouldn't or couldn't tell me which wire they connect to so I used the green wire which is the CPS signal wire to the ECM. Once I am running again, going to get rid of the Edge.
So that is where I am now. No start, I've been reading some of the "what to do" posts, the most likely is that I don't see the tach bounce when trying to start. So I want to check the wiring to make sure I have good connections to the CPS.
So I don't have any diagnostic software to read codes, etc. I really need to fix this myself and only have one set of hands most of the time. Not really sure what the problem was before it stopped running and now I can't diagnose the surging and hesitating.
Ran torque for the first time on my f250, I used it for diagnostics to see if i can find out whats causing the surging. At a red light sitting idle it shows my icp at 705psi seems high to me? I'm running a dp tuner, it was set at stock for this run. It starts surging between 35-50mph and when coasting at about 60mph, surges during light throttle or maintaining throttle at low speeds. If i go about 70mph and up it runs like a champ. Ive changed the tps(entire pedal assembly), uvcg connectors, icp and pigtail. No CEL comes on, torque shows ipr is good, working on hpop pid. I just bought the truck last month and haven't been able to enjoy it much since it started doing this. ...
View 14 RepliesI have a 99 f-250 with about 250k miles. Truck is completely stock. It recently has developed a problem where when I start it in the mornings it surges at idle, 200 rpm or so. Sometimes it tries to die and did once but started back up. When driving it continues to rev itself up and is jerky. It runs rough and sounds like it could be missing on a cylinder. At other times it runs fine just like normal. Yesterday morning it started with these symptoms so I put in a new ford CPS. It ran great for about 100 miles that afternoon. This morning it started back with the same symptoms. The SES light stayed on longer than normal when I started it, but it went off. I don't have a scanner.
I thought it might be water in the fuel because this started the day after I filled it from my transfer tank. But the water in fuel light has never came on. I put a new fuel filter on it but it made no difference. Have pulled filter three times looking for water but never found a drop. Also pulled several buckets from the bottom of my transfer tank but found no water there either. Where to look next?
I have a 1999 f450 7.3 diesel that surges and will stall but will start right back up again and drive. It does this over and over but all ways gets back to the shop. The engine starts good when cold so glow plugs are working correctly. What I have done:
Fuel filter change, check electric fuel pump but have not replaced it. I have replace camshaft sensor.
What I have found d by inspection:
Throttle pedal has 2 electrical connections one for the IVS and one for the TPS. I have experience on the 7.3 IDI diesels but very little on the newer injection system.
I have a 45 min drive to work every day, all highway. Lately on the way home in the afternoon I have been experiencing a surging noise that seems to just happen while I'm doing hwy speeds. It sounds to me like the fan is tuning on and off. Is that possible? It comes on for a few min. And then off again. I have new icp ipr cps. New oil and filter and fuel filter.
Also I'm still having a battery light on and off issue while I'm driving. Is possible the two issues are connected. I plane on doing extensive search for a bad wire this weekend. Batteries and alternator have checked out and are fairly new.
Recently since the weather has been cold. between 0-30 degrees or so. My 2002 7.3 with 161k on it is smoking a decent amount i think. far more than i ever remember it smoking thats for sure! anyways its a combination of blue and white smoke and it doesnt last long when the truck starts maybe 1 minute and the smoke stops.
But I also notice when i rev the truck maybe around 1200 rpms the engine shakes very bad. so i was thinking maybe a glow plug went bad making the engine seem like its missing. but even when its warm i rev it up to 1200 and i still feel the engine shake slightly. Maybe im just being picky when its warm? I need to test the glow plugs and go from there but i want opinions about that issue. the truck sits for 4 hour periods and every time i start it i have smoke. I will pay attention tomorrow morning if it smokes after being plugged in all night and post my findings.
My other issue and this typically happens when its below 20. sometimes i will go to accelerate after coming to a complete stop and the truck kinda has a very weak rev to it then just takes off like the tps took a break on me. sometimes i have had it jerk the truck when the throttle catches and other times it creeps at first then takes off like a boost of power.
lastly and this little issue happens most noticeable at 35 mph. i feel a surging im thinking this is related to the tps but i put the truck on cruise control and i still feel the surging. maybe this ties into my second issue? bad TC? ive plugged in my scanner and the only thing jumping out at me is the icp hunts about 100 psi or more at idle. i plan on doing a WOT test on the HPOP, ICP and IPR tomorrow and see if maybe this is just a weak hpop causing my issues.
Repairs i have done:
new 8th injector and all new injector seals about 25k miles ago.
new ipr
new icp
have CCV mod done and 4 inch turbo back exhaust
new map sensor
cleaned out the EBP sensor and tube but that was probably 40 or 50k ago now.
gray cps and i cant remember when i put that on.
gutted the EBPV
bellowed up pipes
no tunes the truck is factory as far as that goes.
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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