OK a little update. Took cat off no change put injector cleaner in her no change. No throttle response and gray smoke at idle. Put trans fluid in her let her run. Stop blowing smoke at idle

She still runs a little rough at idle and she won't rev past 1100 or so when you have her that high she will smoke. After she warms up no change. Till
You shut her down now she won't idle above 400 with no throttle response

 

Optical sensor/computer issues?

 

Don't use auto trans fluid in the fuel.

It has too many additives you don't want and was never meant to burn.

If you want to lube the IP and injectors-use 0 ash marine 2 cycle oil-it was formulated to lube and burn.

 

The atf was more only squirted into the filter as an attempt to clean. Switched pmd with a good one no change. Switch with original bad one that surged and she still surged to 2k

 

Sounds like IP time.

Make sure that the crank sensor is working first though,most aftermarket crank sensors are junk right out of the box-AC Delco ONLY for replacement electronics on these trucks.

Unplug the CPS and try to start extended cranking is normal-no more than 15 seconds though.

If it starts the OS is good,next plug crank sensor back in and unplug OS and try to start-if it starts crank sensor is ok.

 

Before we did unplug the optical sensor and she still ran like crap no change. Haven't tried the cps will try sometime. But did unplug the coolant temp sensor and she smoothed out at idle but still ran like crap. It did raise the rpms by a couple hundred or a little less

 

ok ran out of time tonight, but i dont know what we changed before but when to start her up (cks unplugged) and she would idle at less than 400 with no throttle response. plugged it back in no change. so i unplugged the optical sensor, i know it was running the other day with it unplugged. but it wouldnt do anything wouldnt smoke, she would try to start but wasnt enough to run.

 

Have you pulled the codes from this vehicle? If the problem is anything sensor related, it should throw a code.

 

It won't throw a code unless I unplug a sensor

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well today i got to mess with the truck. something didnt seam right with the fuel in the tank. compared it to a known good fuel and it was lighter and had a different smell, idk maybe injector cleaner. but just to be on the safe side i bypassed the tank and still had the same problem. but now after letting her run for a couple hours the other day she doesnt want to start as easy if at all.

if you can get her started she usally idles around 400 rpms. if she does decide to idle at 800 you can floor it or bearly push the throttle and she wont rev past 1000. it wont miss or stumble if just stops rising.

on a side note, the other day we thought it was a coincident but when my buddy was driving in the driveway when he switched from drive to reverse it would act funny almost like he pressed the gas. it did this a couple times after while changing from drive to rev. kind of blew it off till tonight. once i got her idling around 800 and the whole throttle deal. he decided to turn the dome light on. and again it acted like someone pressed on the gas. not a real big jump in idle but it was something that would get your attention. so im starting to hope/think its a wiring problem, going to start with redoing all the grounds. i see the one on the manifold with 4 or so grounds then the fire wall but is there a diagram on ground locations. also would there be a area prone for ground problems when it comes to salt

 

so I think somehow the new pmd is either fried or I fried it. looking back a couple post ago when I tested it I wasn't getting any reading for one of the test. now I got ahold of a #5 resistor and put her in and now im not getting any attempt to start. right before the resistor it was at least running. now nothing, im going to go back and retest it. the pmd the resistor came out of was supposed to at least start but once it got hot would cut out. but its not doing anything also, I put the original pmd (the one that surged) and shes surging up and down every second (700rpms-1500 give or take). unplugged the os and she would surge unto 2k then slowly drop back down to 700 this took about 4 seconds then it would rise back up to 2k and slowly go back down. put new pmd box in and nothing, not a spit or sputter.