No Power and no Tach

[gregb]

I have a 99 with 45000 miles and last week this problem started.

When I start the truck my tach will come and go and sometimes

the engine will stumble, I notice that when I have no tach there is not enough power to even pass a Ford! When I get my tach back the power returns. After about 10min of driving the problem is gone. It does this everytime I start the truck after it has been off for awhile, I noticed that sometimes the lift pump doesn't even come on when I first turn the key on, also I put a digital volt meter across my lift pump terminals and read 6. 5 volts after I bump the starter and 11. 5 volts when I turn the key off after I have bumped the starter. I can't always pull up my DTC codes either or erase them, I have 336, 118, 1689 and 1690.

Does it sound like I may have mositure in a connector?

 

[duaneparks]

Greg... take a look here:



https://www.turbodieselregister.com/forums/showthread.php?s=&threadid=36525



That may shed some light on your predicament.

 

[KatDiesel]

0336 - Crankshaft Position Sensor Signal



Problem with voltage signal from CKP



0118 - ECT Sensor Voltage Too High



Engine coolant temperature sensor input above the maximum acceptable voltage



1689 - No Communication Between ECM and Injection Pump Module



Data link circuit failure between ECM and fuel injection pump. Low power, engine derated, or engine stops.



1690 - Fuel Injection Pump CKP Sensor Does Not Agree With ECM CKP Sensor



Problem in fuel sync signal. Possible injection pump timing problem. Low power, engine derated, or engine stops.

 

[KatDiesel]

With this many different sensor problems, it very well could be your ECM and not just a single sensor going bad.

 

[gregb]

Runs Great!!!

I just got my truck back from Dodge and they replaced the crankshaft sensor and she runs Great!!! Thanks for all the advice.