Revs up and down.

[ColoradoColt]

On the way home today truck lost all power and I had no throttle response. Then worked enough for me to get home before reving up and down until I shut it off

[Mopar1973Man]

Error codes? 

 

Fuel pressure?

[ColoradoColt]

No codes. I don’t know my fuel pressure. I ordered a quadzilla adrenaline with a fuel pressure gauge that should be here Tuesday. I just drove 20 more miles back to work after this happened. And no problems. Kind of seems like it surged once or twice at 45-50. Really small nothing too noticeable.

[Mopar1973Man]

ok thats a clue..  Pull the alternator and have it tested for AC ripple and make sure to test the new replacement before leaving the store.

 

Now you need to the W-T ground mod.

 

[ColoradoColt]

I will get the alternator tested. I already did the W-t ground wire mod. Trucks been running fine for a few days since I did that... until today.

[Mopar1973Man]

Alternator could be bad with failed diodes.

[ColoradoColt]

Didn’t have time to get it tested today. On way home today same thing happened but much worse. Lost all throttle response and shut off. Wouldn’t stay back up for a good 30 min. No wait to start light now. No codes. Finally got it started after cranking for 15 seconds 

I’m Thinking ecm?

Edited July 6, 2020 by ColoradoColt

[ColoradoColt]

I noticed something else unrelated maybe someone can help me with..unless it’s ecm related as well....my IAT is always in the 150s. I’ve been in Arizona for a few months and outside temp is in the 90s, sometimes 100s. But even early when it’s in the 70s outside my IAT is never under 140

Edited July 6, 2020 by ColoradoColt

[Threadzy]

If you’re WTS light isn’t coming on. More than likely you have a bad ecm and or pcm. 

[dripley]

Surging and limited or no throttle response are other symptoms too. I had those when my ECM went beserk. Mine had a lot codes also but none for the ECM. Mine also started fine but was pretty much un driveable. ACS in the vendors section would be good to talk with about the issues and get their input. Posted some this in your other thread.

My IAT temp usually runs in the 40* + ambient temp for the most part. If the ECM is bad it could be skewing the numbers. Mine also did that except with the coolant temp gauge.

[Mopar1973Man]

9 hours ago, ColoradoColt said:

I noticed something else unrelated maybe someone can help me with..unless it’s ecm related as well....my IAT is always in the 150s. I’ve been in Arizona for a few months and outside temp is in the 90s, sometimes 100s. But even early when it’s in the 70s outside my IAT is never under 140

 

Check the IAT and ECT sensor at startup in the morning cold. IAT and ECT sensor should match at key on, no start. Take a IR temp gun and measure the brass part of the ECT sensor. The coolant temperature should be close. IAT typically matches on my truck in the morning even in Arizona. I was just down there in June and it was 118*F during the day and start the morning at 80*F. (Mohave Valley, AZ)

[ColoradoColt]

Replaced ecm and fixed it i think. Drove about 100 miles today with no problems and took away p0237 code after quadzilla install