[Ams56]

Hello, i have recently ran into an issue on my 99 ram 2500 cummins. I have possible power/fuel surge while driving and after i stop and shut the truck off sometimes it starts right upnand sometimes it cranks but wont fire. Any suggestions?

 

[bigfish95971]

Better description of symptoms, how , when , where etc or not?
Video/sound of tach when acting up?
What APPS is on it. factory, Timbo or other?
When it will not start does the WTS light come on immediately with the key every time? It does not need to stay on when warm , bu should flash on a second every time.
Pull codes with a scan tool.
It should start every time on first turn.

 

[Ams56]

It has only done it aabout 55mph. Tach guage went out the first time it has done it. It sounds like it revs up and comes back down on its own. Not real high but maybe 200 to 300 rpm and just bounces between 1500-1700 rpm. It will sit and idle all day and not have any issues.

 

[bigfish95971]

If the tach stopped working, get a new Crank shaft position sensor. It goes in the side of the block behind the starter. Starter removal required but not hard. Soak sensor with WE40 first, remove boolt hold down.
Soak, twist and pull out. Pull or pry gently, do not brake the plastic.
If tach stopped or went crazy, it is bad and replacement. Most likely will fix all issues.

 

[Ams56]

I cant really explain the symptoms well. Its almost like im lettng off the throttle and tapping it. The cel came on but went off. I do have a delay in the wts light of about 15 seconds or so. Then i can hear the pump and then the light goes off. I havent had the throttle issue for about 2 days and the cel hasnt come back on. But when i shut the truck off at the store or something when i return i cant get it to start

 

[Ams56]

I will try the crank shaft position sensor. Thank you

 

[bigfish95971]

Does it fail to start until the WTS light comes on for a flash or more?

 

[Ams56]

I have to let it sit for probably 20 min before it will start back up. But i did find out that if the truck is below running temp i can shut it off and start it right up

 

[bigfish95971]

It the wait to start light does not come on immediately every time you turn they to ON and it will not start at that time the ECM is bad and needs replacement. ECM bad is likely causing other issues you are having. Best replacement is used from running wrecked truck. From here or car-part.com( wrecking yards or CL. $200-600.
any from 98.5 or 99 will fit, 00-02 will not. Double check part number on unit.
Do this first and see if it fixes everything.