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Rpm jump

Dieselsmoke24v
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Mopar1973Man

Mopar1973Man

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1 hour ago, Dieselsmoke24v said:

The engine cuts out and drops speed but then comes right back 

 

 

Still pointing to AC noise issue common to see on a manual transmission truck. Like on my truck if fouls the tach signal and the ECM sees the AC noise for a moment the revs up past what I'm commanding for speed the AC noise frequency shifts and then the throttle cuts even though my foot hasn't moved nor has the TPS signal changed. But the RPM signal on the OBDII port is all over the map up and down. 

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dripley

dripley

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1 minute ago, Dieselsmoke24v said:

Mines automatic, where would the noice come from? Everyone’s pointing to the alternator I haven’t checked it yet because of work called me in on a emergency 

 

It originates from the alternator.

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2000Ram2500

2000Ram2500

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5 hours ago, Dieselsmoke24v said:

where would the noice come from?

 

Maybe I'm the only one interpretting this in this way but this isnt an actual noise you can hear its electronic noise. Just making sure we're all on the same page and if you already knew that then forget i said anything

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dripley

dripley

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It js definitely not a noise you can hear. You have test for it with a volt meter that reads mili volts. Mike posted a link to the test in the the 2nd post that describes the process quite well. It is easy to do with the right meter.

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2000Ram2500

2000Ram2500

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9 minutes ago, dripley said:

It js definitely not a noise you can hear. You have test for it with a volt meter that reads mili volts. Mike posted a link to the test in the the 2nd post that describes the process quite well. It is easy to do with the right meter.

 

I knew that i was just saying something for the OP's sake. Im also dealing with the dreaded AC noise right now I just had to make a 1000 mile road trip and i swear i felt every single AC ripple in the throttle it got so bad.. Diodes are on the way now lol

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dripley

dripley

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3 hours ago, 2000Ram2500 said:

 

I knew that i was just saying something for the OP's sake. Im also dealing with the dreaded AC noise right now I just had to make a 1000 mile road trip and i swear i felt every single AC ripple in the throttle it got so bad.. Diodes are on the way now lol

Was backing up what you said. All is good.

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Dieselsmoke24v

Dieselsmoke24v

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He said they hooked it all up to a computer checked all the voltage everything was reading good maybe it was just the throttle position I can’t remember now little worried now, an they already closed I just got the truck back today 

 

Truck isles great runs down the road at 55 no issues got it up to 80 no problems shifts smooth, i can’t remember 100 persent what he said I do remember him saying throttle positioning, not sure what to look for an see what’s going on if he did reset it 

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