Tony302600 Posted February 11, 2007 Share Posted February 11, 2007 Here it is, I finally got it to act up after 2 months, 2004 F-250 99995 when it came in, 102865 now. This was on a drive home with the vehicle ( they let me take it home ) at 80mph, part throttle, same thing happened at full throttle, nothing when off throttle. It DOES NOT do it when cold, has to warm up just a little bit. Codes pulled are new P0336, P0341, P0470, P2617, P0148. I do not beleive its a wiring problem because at idle it runs perfectly fine, start up drive it cold its ok til it warms up. The VERY FIRST time i ever got this vehicle, it WOULD NOT let me go into power balance per fault. Hotline told me its a tone ring issue if that happens, but said dont worry if it doesnt act up. 2 months later here we are. Did all the diag for it. I am leaning torwards a tone ring issue, BUT, how do i check for that since the vehicle is out of warranty. I found a procedure to cheack CRANK tone ring, but not CAM. I could use all the help you guys have because no1 in my shop has a clue so im on my own on this one. These are the PIDS which i found significant, I made 8 recordings with EVERY PID, possible. All the vpwr's, FICM M, L all that are ok no fluctuation in my recordings. Hotline also told me it could be a throttle valve sticking causing that, but FICMSYNC always yes, SYNC would go ON, OFF, ON, OFF with the RPM PID. You guys and this site have helped me out ALOT with these trucks. Quote Link to comment Share on other sites More sharing options...
Keith Browning Posted February 11, 2007 Share Posted February 11, 2007 Tony, what is the complaint with the truck? I think you left that our of your post. Second, good job with making the screenshot, but, sometimes when the image is reduced it becomes difficult to read. Could you email me the original screenshot so I can fiddle with it? These are the images: Quote Link to comment Share on other sites More sharing options...
Tony302600 Posted February 11, 2007 Author Share Posted February 11, 2007 The concern is a buck/jerk at highway speeds it would buck jerk whenever the RPM was above 1500 the rpm gauge would fluctuate in 500-800rpm increments. Again, above 1500 rpm to 3500 it would do it, part or full throttle. Quote Link to comment Share on other sites More sharing options...
Jim Warman Posted February 11, 2007 Share Posted February 11, 2007 Tony, I wouldn't get too concerned with the camshaft "tone ring"... It is simpl;y a single pin on the cam that (basically) tells the PCM if #1 is coming up on compression or coming up on exhaust. If you have the VMM, you can look at the crank sensor using the lab scope. There is a "preset" in the lab scope that takes the guesswork out of voltage, triggers and such for the VRS CKP as well as a known good pattern in the library to compare your sensor to. HTH Quote Link to comment Share on other sites More sharing options...
Tony302600 Posted February 11, 2007 Author Share Posted February 11, 2007 so wut am i looking for, can it be a bad cam sensor, the connector has been changed by another tech. Could the Alternator be sending RF frequency? i've had a 4.6 mustang do that. I'm honestly stumped so I came to you guys cuz u guys always help me out Quote Link to comment Share on other sites More sharing options...
DamageINC Posted February 11, 2007 Share Posted February 11, 2007 Wow, some of those pids look like richter-scale printouts from "The Big One". I guess from what you describe and the pids shown, that my first thought would also be that there's a problem with the crank sensor signal, whether it's a mechanical issue with the trigger wheel or an electrical/wiring fault. RFI from an alternator is certainly not out of the question either... it may not be a bad idea to keep the interior fuse panel open and keep a puller on the fuse for the alternator. Then, if it acts up, yank the fuse while driving to kill the alternator and see if the problem alleviates. Dave Quote Link to comment Share on other sites More sharing options...
Keith Browning Posted February 12, 2007 Share Posted February 12, 2007 I added the files to my post above, he's losing SYNC... Quote Link to comment Share on other sites More sharing options...
ktmlew Posted February 12, 2007 Share Posted February 12, 2007 I don't like the ICP & IPR readings. Look like "static" instead of being a clean reading? I would replace ICP & IPR connectors and re-test. http://www.forddoctorsdts.com/forums/user_files/11-buckjerk1.JPG In the above graph several readings "flat-line". Is that when the problem actually occurred? Quote Link to comment Share on other sites More sharing options...
Tony302600 Posted February 14, 2007 Author Share Posted February 14, 2007 Ok guys heres an update, told hotline all my readings from the recording, he sent me an excellent procedure to find SYNC, FICMSYNC, no start etc etc. He says it cannot be a tone ring, it is wiring. So being that it has 100,088 and Ford is helping him out, I changed the main enigne harness ( per hotline ) and the crank and cam sensors.....fired it up, let it get hot, runs great. I did voltage drop on the Cam and Crank CKT, and only lost .01v through the wire, but found a portion of the harness ( crank pigtail ) that i didnt like so that also was teh reason for changing the harness. Going to drive it tom. ( wicked winter storm ) and i'll tell you hoow it went. Personally I think it was just a Cam sensor issue. Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.