snagster123

98 XJ Sport: Finally got her started... it was the fuel pump.... So far I have installed a new fuel pump, cleaned out the fuel tank and lines, installed new fuel injectors, cleaned the throttle body, new map sensor, new IAC sensor, (TPS was good to go). So I did a volt meter test on the Crank Position Sensor.. it is getting 5+ volts from the Orange wire, but the gray wire (reference) is only showing like .3 volts. the jeep is running pretty bad like misfireing and just running rough.

Any help would be great...

Thanks,
Andy

snagster123

bump for some help...

Dave51

How are you checking the gray wire?

snagster123

I use a safety pin to insert into the wire just before the connections, and then hook up the multimeter, on the 20v setting.

Dave51

Engine Off? Engine on? Cranking? Running? Ground wire connected somewhere?

snagster123

it was with the engine running, Ground was connected at the battery.

Dave51

The CPS signal is actually a rapid series of 5.0 VDC pulses, such that trying to measure them with a simple DVM would give a value of ~2.0 - 3.0 VDC. You might try rotating the engine by hand, ignition on, very slowly, to see if you can generate some 5.0 VDC signals. Proper testing is more involved see jeepmanthing4x4 thread.

Dave51

To give you an idea of how slow, find a picture of the reluctor windows in the flexplate. Those tell the CPS to send a signal.

Dave51

You might wanna do the same for cam position sensor.

snagster123

I cant find a cam position sensor for this engine to buy. are they obsolete?

Dave51

"sync sensor".

Dave51

"sync signal generator".

Dave51

"sync pulse generator"

Dave51

...but it's really a camshaft position sensor...

snagster123

so I found a "Wells" brand on line; or a "Master Pro" at O'Riley... not sure which one to go with... Also found one at Advance... "Carquest Premium"....