Tex-


In a differnent post you said:


Quick thing to try, plug the optic sensor in, and unplug the crank sensor. it should start, you'll be in limp mode again, but if it works then you can be sure the optic sensor works and you might be getting a faulty crank sensor signal which would explain the 14 degrees.


I also read this: http://www.smpcorp.com/download/view/tt3q00.pdf (http://http://www.smpcorp.com/download/view/tt3q00.pdf)


Which states that the truck should run in limp mode with either the crank position sensor or the optical sensor disconnected. On my truck with the engine running, disconnecting EITHER the CPS or the optical will cause an immediate shutdown with no restart untill I plug it back in. It shows no codes when running, and I dont have any kind of advanced scanner to check anything else.


I have never been truly happy with the power from my truck. It tows my 3500lb boat like it weighs 13,500 lbs. New injectors has helped some, but I still think it should have more poop in the launch stroke. I am thinking about getting a new timing gearset next, hoping that my lack of oomph is due to timing chain stretch causing late valve timing. But now after reading this, I am wondering if I have a sensor problem somewhere.


Any comments.


Thanks!


TimEdited by: Cowracer

The Diesel Guy will need to verify this but I am pretty sure that the SES light would be on if either is bad. Did you try to restart it with either of them unplugged? It may take upto 20 seconds of cranking till it starts.


My truck also feels like a 3500 Lb trailer weighs 13,000 but it a 13,000 Lb trailer doesn't pull much different.

yes, your computer counts the CPS signals and detects any missed ones and would set a code if there was a problem. Your truck should start with one of the two unplugged, but you will have to crank it a lot longer than what you are used to, long enough for the computer to give up on the sensor you unplugged and rely soley on the remaining signal. if you dont have a trouble code for timing/cam/crank sensor then its not a problem. The scenario I suggested in the other post is also extremely unlikely, unless you've had the crank out and bent the tone wheel or something of the sort. I dont even know if its possible for the crank sensor to process a signal late resulting in a timing problem, but if it was 14 degrees out, the truck would run like an absolute bag of crap, if at all. None of these trucks were really stock performers, so dont assume somethings wrong with it just because it wont pull your boat like you want, emissions regulations and engine design really limited it from the factory.Edited by: Texas Diesel Guy