Hey guys

I've been doing alot of home work and searching on this site for anwers to my vibration, shake, chatter problem(more specfics later). There are many posts about it but no real answer to the problems that people are having. I hope or think I can help with the experiences I have gone through, first off my vibration in perticular.

I would be crusing in my truck in 2WD I'd get a slight vibration at 48-55 then 60 then 80. I was getting the vibration in the floor pan,some what in the steering wheel nothing crazy though,(basicly you knew it was there but you could live with it). When I would put it in 4WD you know when your going 50,60 then 80 because the steering wheel, floor pan, dash, the whole front end would vibrate vilantly.

Now lets consentrate on some other problems I have, rough starting(would make it seem as if the IAC was acting up), there was a slight ping or fluter you'd hear(some people would call it a putter). When the truck was running, I thought it was the headers making the noise because there are some studs missing (makes sence right? )

So I took it to a place called C.T. Cam, they speacailize in driveterrian, well to tell you the truth thats all they do. Took it in early in the morning told them my porblems and when I experience them. I have no idea what the call the procegure but it involved jacking the truck off the floor completely and straping it down, so they went to the speeds I said were problem area's in 2WD, He said the drive shaft in the rear was showing some movement at 80klm's/hr but 40kl-60kl should no sign's of problems I was explainning, did the exact same thing in 4WD with the same results. (I told my self, well F... that ain't possible it was doing it while I was driving here.)

So we went out for a ride, the symptoms that I had explained to them earlyer had magicly reapeared 40kl-60kl but at 80kl the slight vibration was fixed. It just so happens that my truck's problem was so speacail they called in the old timer in the shop,turns out he's a pro drag car builder/engine tunning(who'd a thought?) he gets in my truck, rough starts, notices the putter, pulls on the hood latch gets out the truck. Opens the hood listens closely then walks towards the tail pipes, listens for a bit then gets back in the truck.

Says my engine's missing, garunteed 1 dead cylinder possibly 2. So we head out on the highway hit 45-60 klms in 2WD he notes the slight vibration, then puts it in 4WD(the violance begins ). we head back to C.T he connects a 5000lb trailer to my truck, he claims the violant vibration,shake,chatter is caused by the engine under load (4WD puts load on your engine) and if I'am right it will do the same in 2WD with the trailer attached, sure enough it did.

Can I say its the dead cylinders? and there the cause of my vibratting problems? Not yet, that's 2 months from now, but I'am sure as hell going to let you guys know.


Hope this gives some light or step in the right direction with your trucks problem as well
Regards
Skoda

P.S some guys are probably wondering why its in the V10 section, well my baby's a V10

 

Did you or they determine which two cylinders? Why two months? I am a bit confused by the ending...


biz

 

Haven't figured out which cylinders yet, the reason for having to wait 2 months is I gotta save up some cash to have the problem fixed. I mean 2 months by I'll have a deffinate answer for you guys by then.

 

If its failing under load its probably a COP/ boot. Buy one and rotate through the 10 cylinders until you find one of the bad ones. That way you wouldn't have to replace more than you need.

 

ahhh....gotcha Skoda. Good luck with it...


biz

 

Did you ever get a DTC on the dash. These engines have a crank shaft position sensor in them that is used for some of the ignition timing on the engine. It will also register when one cylinder is not firing because the speed on the cylinder wil slow down in comparison to the others. By doing this it can tell you which cyclinder is missing. If you have a dead cylinder you should have a DTC.

 

No I haven't had the DTC light up, not even sure were I would find it to light up on the dash? The engine service light does not eluminate either... I read an article posted some were on this forum that nothing more then 20%. 20% of what I'am not sure... but one dead cylinder can add up to 12%

ordered 2 COP's, bummer is it's going to take 3 weeks to get here. . .

 

I recommend if you do not have the original Owner's Manual, then go to this link (Motorcraft) and download. I believe it has a 4th printing available in .pdf format.
http://www.motorcraftservice.com/vdi...250+Super+Duty

There you will find the "Service Engine Soon" on page 8. It is found just under the Tach...and should light up everytime you start your SD. When you turn the ignition to the "ON" position (which is right before the "start"). This is a test for all the bulbs on the instrument cluster.

Talking about percentages...it is per cylinder or mis-fire. If you have two dead cylinders due to COP failures, that is a 100% failure per cylinder. The "Service Engine Soon" should have triggered...or may even blink.

Hope this helps...


biz

 

If you do not have a DTC which will show as a small engine on your dash then I am not sure that your problem is a dead cylinder. Let us know what you eventually find.
LOL.

 

Concerning the percentage at which the misfire code will trigger I found this. If the misfire causes a 2 percent change in crankshaft speed in a 1000-RPM interval, a DTC is stored but the light on the dash is not turned on. If the misfire monitor detects the same related misfire on the next trip, the PCM turns on the light on your dash indicating a problem. Have you had a code reader plugged into your truck to see if there are any diagnostic trouble codes that may not be showing up on the dash.

 

Checked the cluster today, the engine service light does not light up also checked up that dtc you were talking about, doesn't look like I have one... That possible? No I haven't checked it with a obd2 scanner.

 

I believe Skoda has a '99 SD V10...and there is not a "small engine" indicator. What you are thinking is the "Service Engine Soon" indicator. At least this is according to the 1999 F250 SD Owner's Manual 4th print found at Motorcraft.com website.

Just a little clarification...


biz

 

If the "service engine soon" light does not light up on the #4 or "ON" position with the ignition, then the bulb might be burnt out.

True story...I have a friend that bought a 2002 car...and was having issues with the engine. Turns out...that the PCM was recording fault codes, but did not light up the indicator on the dash. Reason...was that the previous owner (or someone) removed the bulb all together. Errr!!! Luckily...that is why they light up before start to determine if the bulb is bad.

Good luck...


biz

 

Had the same problem a few weeks ago with my 2000 SD. The problem show up during a very rainy week when I was pulling a loaded cattle trailer, happened so suddenly that i got out and checked for a flat tire on the trailer. It was very bad at low rpm's, but I managed to get back home. Turning OD off and running high rpm helped alot. Since it had never been tuned, I replaced the plugs and boots and thought that it had cured the problem, it seemed to run fine. The next time I hooked to a loaded trailer I could tell it still wasn't exactly right, borrowed a friends scanner, and it reported misfire detected on cyls 4 and 8. Replaced 2 cops and now it pulls a load as it should, but it still seems to stumble a bit at low rpm(1300-1600) when first starting truck in the morning it will start right up and then die but will start again immediately, sounding fine. '

 

Wasn't finished with other post, I was trying to edit some when I hit the reply icon. What I wanted to add was that the scanner does not read any problems now. I have searched for loose connections, vacuum leaks, ect. Again nothing noticable except at low rpm, at med or high rpm, runs and pulls great. Maybe someone can help me also.