Diagnosing a 2002 Ford Excursion 6.8L Stalling Problem using Automotive Test Solutions eSCAN ELITE & eSCOPE ELITE. www.automotivetestsolutions.c... www.automotivetestsolutions.c...
I wonder how many of us even guessed that an ignition coil problem could be the culprit for an input/output transmission shaft speed code. I certainly didn't and furthermore, doubt any flow chart would suggest such a possibility either... Another masterclass by Bernie.
My main question is with that ignition problem why is it only as affecting the speed sensor circuits and not other circuits such as the crank or Cam having induced voltage spikes well that has to be bleeding back through the computer at this point from what I see to only affect the speed sensor that doesn't sound logical to me
Many years ago when I was at the GM training center the instructor constantly told us to "think" like a computer when diagnosing drivability concerns. Good advice that has served me well
Hey Mr Thompson, I love your content and can’t wait for each video you produce. Being bothered to share your knowledge with us wannabe expert diagnostic techs is very much appreciated and long May it continue. Thank you!
@@philh9238 Ivan is unsure on a lot of things but eventually comes to a conclusion. Has had misdiags in some of his videos and that just shows that some cars are just too hard to hit the nail on the head. Bernie knows too much to misdiagnose since he knows technical information that a lot of us dont. He is an engineer.
@@mejesse809 Ivan can't hold a candle ? This is rude. Ivan is the same level as Keith. Bernie Thompson is the guru. Stuzman is also engineer and knows the finicky things about electrical and electronics but not everyday mechanic. Maic Salazar has lab where he REPAIRS modules of european vehicles. Can't hold a candle.. bad comment..really bad 👎
Just a few of those ignition spikes is all you need to cause a Stalling issue. That particular Speed Sensor is a critical component. You mentioned the ECM turning off some injectors to limit Torque. Needing to know how fast the vehicle is going as well as what gear the transmission is in as well as other outputs is part of the ECM strategy to control the vehicle and make it run right.
Mr Thompson I wanna thank you for taking the time to produce these case study videos. The amount of information passed on to the audience is invaluable in building a stronger diagnostic foundation
Really informative video. I love "the test drives the diagnosis" approach it saves so much time and is extremely accurate. This was a masterclass on how to use measurements to look at the car from a completely different perspective. Very well done!
Exact same excursion with the same problem. Just bought some of that 505 crf. Also the oil treatment. Not cheap but Scotty Kilmer also reviewed the oil treatment with and noticeable difference in engine noise afterwards. Thanks!
I was driving to Florida few years ago with my 03 Ex 6.8 176K , was running rough and getting the flashing code on the shifter. Sargeant Service Center in St Augustine diagnosed as coil pack failure. I was 1000 miles from home and they could have pulled my pants down. Credit to that shop. Changed plugs and coil packs, I didnt have any problems the 1000 miles home. Now sitting pretty at 215K. I always have used Dextron, will try the 505.
Bernie really has a Hand for the strangest Cars.....If he would not film it, many People just could not imagine the Problem and the Cause and the Fix.....CRAZY.....
Anyone this skilled or have these skills in West Yorkshire, UK? If so I'd love to come and volunteer with you on a Saturday. I've been a mechanic for 20 years in a garage that isn't interested in this kind of stuff and I'm craving some knowledge! Awesome video and diagnosis 😊
defiantly learned something with this video great Job. After the coil was replaced you kept saying the the firing line was showing a lean condition wish you would have shown the fuel trims and/or fuel pressure.
A V10 6.8L You had better take care of that engine. Service, service, service. People neglect maintenance so suffer the consequences. Young men and woman need to take care of there vehicles. I enjoyed your video and will be looking for some new content from this good RU-vid channel. Thank you
great diag and good to see the proof on the injector cleaner. with 200k all the coils and plugs have been stressed. although its fixed a recomendation for a full set of plugs and coils would be offered. i really didnt like the looks on #1
hola sr thompson agradesco mucho sus videos he aprendido mucho de ellos gracias. tengo problemas con una jeep grand cherokee 4.7 2001 se sobrecalienta y no he encontrado buena informacion sobre hidro cooling fan de como funciona y como diagnosticarlo gracias de antemano por su tiempo y que dios loi bendiga por ayudar a tanta gente
Great diag as always, Autel maxisys greatest choice:) I can't afford high end oscilloscope yet, terrible times coming.. Hantek doing some job but rubbish resolution..
Bernie, where can I go to learn about how to determine a scope readings shape? Like when you say "that looks like a carbon arc, or a coil on a lean cylinder" I'm a dealer tech and have never been taught anything like this, it's astounding how in depth they are.
Regarding "clogged injectors", I'm curious what fuel trims and WOT O2 looked like. Also, injector drop test might be interesting, especially before and after fuel additive.
I also will perform a lot of tests and similar circuits or the same ones which is the key on engine off determine whether or not there is actually a problem inside the PCM
I'm very curious why a cylinder balance test wasn't performed and I also remember you saying in the beginning that all the fuel trims look fine usually if there's some type of a misfire and fuel trims will start to go in a lean direction?
We had 2002 through 2004 F250 through F550's some with the 5.4 V8 and 6.8 V10 engines. We also had some E250 and E350 vans. The E350's had the 6.8 V10's. I would see many of the F350/6.8 V10's have one specific computer code for the I.S.S. or Input Shaft Speed sensor in the transmission. The first one I got drove me crazy because no matter how I tested the vehicle, the code would not return. All I had for a scope between 1995 and 2016 was my Fluke 98 Series 2. I sure wish I had my Pico back then. One day reading some iATN postings, a tech indicated how he had a V6 minivan with intermittent engine stalling and he found out by putting the vehicle inside the shop, wetting down the V6's spark plug wires then starting it, number 1 was arcing along the length of the wire and the engine would stall. The wires were original and the vehicle was old, so new(very much needed) ignition wires and worn with a large gap plugs were replaced. No more stalling and a better running vehicle. So I decided to check the plugs and sure enough......W I D E gaps on all 10. The coils were original and Ford had updated their Motorcraft coil after a few years. After properly gapping and torqueing the plugs then replacing the 10 coils, no more I.S.S. computer code. The F350's were utility body duel rear tires and we're loaded down with tools and parts. These were L.A. Depth of Water & Power trucks with 25,000 to 40,000 miles on them when the problem would occur. City stop and go mostly, so plug wear was normal. The F250 pickups had a similar problem but they had over 50,000 miles on their odometers. Your video suddenly made sense why I saw those vehicles with the I.S.S. code. Seeing the "Ignition Strike" backing up into the sensor which shut off the engine made sense! That strike also helped to create the carbon tracking internal to the coil. I'll bet the spark plugs had worn and wide gaps. Ignition coils don't normally like wide plug gaps! Thank you for this video!
Bernie, if you read these comments, can you expound on how the computer’s assuming transmission slipping when the output is showing higher rpm than the input? It should be the other way around if it was a slip detection strategy. I think this was purely an EMI concern from a misfire and the computer losing counts than it was a fuel cut strategy from a slip (which it didn’t have at all)
Was thinking the same thing…had a older gm car do this due to the wiring harness for the output shaft speed sensor intermittently grounding against the case. Guess the bias voltage and the short to ground was enough to create current flow and when the short would go away it would spike a little bit like an ignition coil which caused the computer to interpret the high spikes as a speed signal. Just as you were coming to a stop it would shut off. Seemed to me like it was going into open loop/fuel cut since its saw a speed signal with no throttle input like if u let off the gas while coasting at say 50mph, the computer would turn off the injectors until you got back into the throttle. Still always impressed with Bernie’s knowledge and the tests he comes up with. Also grateful he’s willing to share it.
You mentioned understanding what the computer does well you would have to be privy to that information otherwise it's just guess work every manufacturer uses a different format to accomplish sometimes the same thing also I'm curious on how the ignition is only affecting the speed sensor and nothing else if that be the case then there must be something wrong with the PCM allowing it to infect the speed sensor circuit and nothing else
When you replace spark plugs you replace all of them, would it not be a good idea to just replace all injectors or coils, so you dont have it come back for each one that fails?
my brother said his f-150 trans was acting up. 130k i asked him when he changed the spark plugs. he hadnt cuz he heard the 5.4 nightmares. besides he said it ran ok. plug change fixed it. these things are engineered on the edge. everything is interwoven.
As a brother advice do not throw your money away by buying their worthless scanner, I wish I didnt buy it from them, it was the first mistake which I made in my life I regret for that be aware not to do so I warned you just for sake of God.
