hi there, i have a 98 jimmy and am having some serious problems with it. about two weeks ago the vehicle blew the intake cover gasket and dumped coolant in the engine. during this it started to run really rough and heat up so i shut it off. we replaced the distributor, cam position sensor, coil, ign. module, water temp sensor, iat, fuel filter, fuel injection unit, tested fuel pressure with 56lbs, tested ckp with 1200ohms. it still throws the same p0339 (cam sensor) and p0341 (crank pos. runs when cold except when reved and barely runs when warm. when it starts to run bad the timing light jumps all over the place and it spark knocks bad. last night it didnt even want to start and now it runs. im stumped. any help would be great! please help!

 

Have you taken a look at the DTC threads dealing with those codes?

P0341
P0339

 

Test the wiring to both the CKP and the CMP sensors. Also, check your PCM grounds (back of the passenger side cylinder head).

The wiring diagrams for both the CMP and CKP sensors are located in the DTC listing for both of these codes. Use the link to the OBDII Code Index in my signature. Or the sniped links Alex posted above.

 

ive checked the pcm ground and the sensors but have no idea where to start with checking the wires. we have 10.5v at ckp pink and yellow is a good ground

i just checked the voltage and ohms at the ckp plug and here is what i got.
pink=12.7v
purple=2.5ohms on the 200k setting
yellow= 52ohms on the 200k setting

 

Test the continuity from the plug on the sensor to the appropriate terminal on the PCM connector as identified in the wiring schematics in the diagnostic sheets.

 

so is it saying to run my dmm on the yellow wire and set the meter to ac hz and set it on duty cycle and attach the neg to ground?

 

well we got it running great again! it ended up being a few things. the ckp and wiring connector. and also the wiring connector to the coil.

thanks a bunch guys for all ur help!