HarryBiron093

I have 2002 RD E7 460. It’s been throwing the 3-4 code since I bought the truck 2 years ago. When I first got it there were no shims in the cam sensor. I replaced front and rear sensor. In order to get the light out and no stumble I needed 2 big shims and one little one. This year it needs another small shim to keep the light out. With this being said when it’s raining the truck runs worse but the code is never logged continually like a direct short. I sent the ECM out and got it rebuild with no help to the situation. I have verified via Mack Pro again thank you ! That my software is level 7 which is above the required per the service bulletin on the 3-4 code. I pulled the front cover today in hopes to find a worn thrust washer but I don’t see much wear on it. If you look at the picture youl see that it looks like the sensor is touching the the cam gear. Does the washer wear behind the cam gear where you can’t see it ? Anyone ever heated the gear and pulled it in place to avoid pulling the cam ? Help is much appreciated !!

What does the connector end up going to so I know it’s the right one ?

Yes the key switch will work the first time and then it will take 3 cycles sometimes.

I checked the ECU fuse and wiggled per Joe H with no luck of killing the engine. See below in the video with no engine light coming on. The idle surge is no longer as issue but thanks for all the input it just needed a set of filters. The big problem is the truck dying out while driving and then coming back to life. Since to lighting bolt isn’t currently available I don’t have another way to check codes do I ? V Mac3 I don’t seem to find this connector any other descriptors ? IMG_5520.MOV

Joey Mack this was the repair bill from the sensors. He told me they put the rear and front speed sensors in, nothing related to the cam or crank to my knowledge. I will check those fuses ! Thanks all

New to the form any help is appreciated. I have an 02 RD 688 with the 460. When i bought the truck it had the problem and i have chased it since. You will be going along and the tack will go to zero for a few seconds engine dies and then restarts. The local mack garage changed both speed sensors and over the winter i sent the ECM out thinking it that it might be that. I drove the truck yesterday and it still has the cut out. Other issues When you go to shut the truck off sometimes you have to turn the key back and forth a couple times before it shuts down. I have checked the wiring and replaced the key switch hoping to fix the issue with no success. Not sure if the 2 are related or not but any thoughts on this issue is appreciated. When you plug into the truck it had/has a code for the pyrometer. But there isn't an engine light on the dash. Mack said the bulb was missing but i pulled the dash and its a sealed unit