Help please! I’ve tried it all have no clue any more!
99 24 valve, starts fine, runs, rpm gauge not working, won’t go pass 1000-1500 rpm, guessing on that because no rpm.
things I’ve done
no stock lift pump has air dog
new apps
new crankcase sensor
new cam sensor
new fuel filters
new(refurbish) ECM
what happened
Was driving and just wouldn’t go pass 1000 rpm, no tach, replace crankcase sensor, didn’t fix it, unplugged it, plugged it back in and it fixed it, worked for couple days, then same thing happened, went and got another sensor, replaced it, didn’t work, check the wires to the sensor to the ECM all good, and voltage was like 4.98. Then replaced ECM, first try started same problem turned it off, started it again worked great.. lasted two days, sent ECM back they tested sent it back I installed it, same problem, read only to use Cummins CKS, ordered it put it in same problem, on to apps installed new one, no change, today installed new Cam sensor, same results
only thing I did notice is the fuel pressure gauge which usually stays at 15 will now climb to 18-20 then drop back to 15 then climb again then drop... lost no idea anymore