I have had a developing problem with my 96 PSD throwing a trouble code but not keeping it. What I mean by a trouble code is the Check Engine light coming on. It only throws it at random times when I have the truck in higher RPMs and am mashing the pedal to the floor. The light will come on for a while but then go right back off. I have gone in and had it check for codes and they find nothing. I was hoping someone might know of a way to make the truck keep the codes so I can find out whats going on? I just recently installed the ICP Resistor Mod but aside from that my truck is completely stock. I don't know if this has anything to do with it but my truck has had a 'stutter' problem a couple times as well. I will be driving down the road at a cruising speed or accelerating normally, it doesn't matter, and the truck will all a sudden have an instant and very violent jerk. It is like the engine instantly looses fuel and then has it back a split second later. It has not ever turned the check engine light on when it does the stutter so I have no idea if these two problems are related. Any help would be greatly appreciated!

 

Without knowing the answer, or guessing at it, I would try removing the single modification to see if the problem persists. Do you get trouble code p1111 (system pass)?

 

More then likely you are using a generic code reader which will not read PSD codes.

The codes you will find is P1211... Due to your ICP mod making the HPOP work harder and the PCM throwing a code because of it. Its not hurting anything, its showing you that your ICP mod is not the proper way to build more HP in the PSD.

 

Well I have a new problem. My truck completely died on me yesterday. I got a real code reader on it and I got the P1211 code like you said. I also got 2 other codes, P1280 and P0340. P1280 says the Integrated Control Panel Circuit is Out of Range Low. And P0340 says the Camshaft Position Sensor Circuit Malfunction. I am working on getting P0340 fixed but I have no idea what P1280 is... I can't start the truck right now at all. All it does is crank over doesn't fire.

 

P1280 ICP Circuit Out of Range Low

ICP is not control panel...

ICP is Injector Control Pressure...

Pull your 10k mod. Its bad or wired wrong...

 

Thanks for correcting me... I pulled the mod as soon as this all started, no difference. I am sure that the mod was wired right and am pretty sure it had no effect on this happening. I am thinking now that the ICP is bad. I hooked a scan tool up and it said the ICP voltage was between .17 and .20 and I am told this is bad and needs to be between .20 and .25 volts. I am trying to figure out what the ohm resistance is supposed to be so I can test that and make sure the sensor is bad before I go dropping 160 bucks on it... Would anyone happen to know what that would be? Thanks for all your help!

 

What makes you think it is the sensor and not the valve or the pump or the oil?

 

I thought it was the ICP because the scanner said it was out of the voltage range. Doesn't matter now, I broke the ICP Sensor trying to get it out to test it. It has a brand new one in it now. Nothing has changed truck still cranks over with no tries to fire. I check for fuel at the injection pump, plenty there. I am out of ideas. Anyone have anything? Thanks in advance for any help.

 

remove one of the caps on top of the HPO res and see if there is oil in there.

Then you need to have a scanner that can check HPO pressures when cranking. My guess is you have a bad IPR...

 

I checked the HPOP res today and it was out... Filled it up but the truck still didn't start. I will have a scan tool tomorrow to be able to check for HPO pressure. How can I test to see if it is the IPR? And will the IPR just stop working all of a sudden and cause the truck to not run at all? Thanks for your help!