i guess i'll pull the cover again and keep lookin

 

Boy you guys rock!!!! Having the exact same problem and was wondering where the map sensor is located? Silly me, I would have never even thought about touching the exhaust manifold to check for heat.

 

it could be a connection but it could also be a bad IDM. You need to use an ohm meter to check the connections.

Bushinspector your MAP sensor is the sensor that the rubber hose is conencted to coming off the regulator in this pic. it has a gray body with an electrical connector and 1/4" rubber hose

 

Reread everyones post and i guess it is time to go under the valve cover. I guess I'm to cheep to hire anything done. But with everyones help, why pay for somthing when you can learn about it for free!!!! Thanks again--bushinspector

 

what is the idm brother? and where is it located? how many omhs do i need in these connections? do all this with the key on? thanks again guys

 

IDM- Injector Driver Module

 

To test the injectors and GP without pulling the valve covers here is what you do.
Each valve cover has 2 connectors each. Each connector has 5 pins once you unplug the harness.

The pins are like this

1 2 3 4 5
- - - - -

1 and 5 are the glow plugs. with your ohm meter put the negative lead on the negative battery terminal and the positive lead on one pin at a time. You reading should be 5-10 ohms for good GP's. hopefully closer to 5 ohms. over that or "out of limit" you have bad wiring or a bad glow plug.

To test the injectors you put the negative lead of the meter on pin 3 and place the positive lead on either 2 or 4. With good wiring and a good injector soleniod you should have around 3.5 ohms. Pin #3 is common to both injectors that why you don't need to move it. If you have higher than 3.5 ohms you have bad wiring or a bad injector.

But I must say that if all 4 cylinders aren't firing you are more than likely looking at an IDM. if you have any friends that have a PSD just swap IDM's with them to test it. 94.5 to 03 IDM are interchangeable though not the same.

 

TJ, just for clarification on map sensor issues, when at idle if its bad and you UNPLUG it, what is supposed to happen? Supposed to be better worse, or the same?

And secondly, if the map sensor is good, and you unplug it, what happens? Better worse, or same? I get this confused everytime.

 

unplugging the MAP should be done with key off. But if the MAP is bad then the truck will run down the road better than with it plugged in. The MAP won't affect idle as far as I know unless its showing boost pressure when it shouldn't.

 

ok i got another 96 psd out of a junkyard with a bad transmission with 310k. and it runs. i swapped the uvch i suspected was bad. made no difference. then i swapped the "driver injection module" and still it made no difference. sorry its been so long since ive replied but works been crazy. im stumped guys i need your help

 

Do the test below on all 4 connectors going into the valve covers but do the side that is cold first. You may find more bad connections. If that isn' the case and the IDM is good then you have a wiring issue between the IDM and the Valve cover.

 

Like TJ said check the harness behind the plug that plugs into the valve cover ,also check the pins on the male side chances are that is burnt as well and did you change the gaskets?

 

yes sir i swapped a good idm and vcwh and am getting the same trouble i'll buy me an ohm meter tomarrow and see what comes up. ur good guys theres a spot in heaven for guys.

 

guys, this ohm meter im hain trouble understanding. something that might help me, is there a usuall place these particular wires rub through? from what you guys have experenced or hear about? if i cant find it(which i havent looked yet). i'll have to figure this ohm meter out. thanks again guys!

 

this is the ohm meter i just bought. this may sound stupid but which one of these checks the ohms ive never used one and im sure having trouble figuring it out thanks for the help buddy