I am having a weird issue with the service engine soon light coming on and off. I will work normally the first thing, then when I put it into drive in comes on and will stay on until either I depress the accellorater then it will go off for a short time. I had a code 13 which is supposed to be the engine shut off solenoid. I cleared the codes and started it up and now I get a code 33 which is supposeds to be the EGR control pressure/Baro sensor circut high. How can I fix this and where is it located. I am thinking that it is one of the sensors that on in the group on the driverside of the intake

 

make sure everything is grounded good.....

 

So weird! Just bought a BEAUTIFUL 1993 6.5 td 4x4 crewcab dually, and I have the following probs:
1) The "BRAKE" light is off when u start it, then comes on at EXACTLY 35 mph!!!

2) The SERV ENG SOON light is on at idle, then when u step on accel it goes off, when u let off accel it comes on - WHA???

3) Cruise doesn't work ( prob becuz BRAKE light is on)

4) Hi idle solenoid doesn't operate at all ( 15 degrees out)

Had a REAL slow crank w/ 2 new batts, but checked batt terminals, and they were junky - cleaned and greased - crank prob solved!

5) The glowplugs wouldn't cycle on cold startup, but I was fiddling around back by the glowplug control relay, and now they cycle ( HATE THAT! - wish I knew what the prob was)


I have the day off today - I'm gonna have a connection cleaning party and a HUGE GROUNDING CHECK - then I'll get back to you! MANY people have said it sounds like a ground problem.

L8R!

 

sounds like a ground problem

 

need to clean all the grounds

 

which grounds need to be cleaned?, i'm having the same problem but my cruise works and everything is normal. the engine light comes on when i let off but as soon as i accelerate it goes off. i'm getting a similar egr code, and a code 78 which was something to do with the factory wastegate.

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o and i had a code for the shut off solenoid as well but i had a diesel leak on the top where the wires go into it on the injection pump. fixed the leak and the code hasn't came back.

 

there are grounds on the top the intake manifold and on the frame on the passenger side. clean them to they are shiny metal