Anyone have problems with stumble during hard acceleration? Mostly when fully warmed up and in a hot muggy atmosphere. I cleaned the TB and sensors but only a slight improvement. I read once of a tip on clocking the TPS to achieve 7.0 VDC positive wire to ground. Normal is around 4.75 VDC. The tip said this would clear up stumbling problems on the Dak 4.7. The trick was to drill out the brass bushing where the mounting screws go through to give space for clocking the sensor. Please help me out here if you have a stumbling problem described and tips to correct it.

 

I have a slight stumble sometimes as well. I haven't done anything to clear it up.

 

By stumble, do you mean "flat spot" in the power band, or does it drop hard like you've momentarily lost spark? Mine has a flat spot between 3000-4000 RPM. Really bad in the humid summer, very slight in cool weather.

 

It as if it’s being held back like not a full loss of spark but almost. It is like in the old days of ignition points they would float at high rpms and cause a slight miss fire. Or even like the timing curve is not keeping up. Again only after she warms up and a hot, humid ambient temp. I'm thinking a sensor problem maybe. I just know there is a pinpoint reason that someone has the answer for. The dealer will never either feel or understand it or try to get it in for a TB and injector cleaning with no fix as usual.

 

I would say a little bit of both to be honest. Sometimes when I put the hammer down it starts climbing in RPMs and then it stops for a split second once or twice like it needs to catch its breath. I would say my biggest dead spot is in first and anything over 4.5k rpms.

 

Ok now with members input starting has anyone been aggravated or annoyed by this enough to figure out what might be causing it? It seems it could be more common then many thought because I have read this a year ago in this forum and in the Ram and Jeep forums and it all seem to be with 4.7. Still no solutions accept the clocking of the TPS. This voltage number “I stand corrected” was to achieve a 5.0 VDC even though the manual is in the 4 VDC range. I might try this modification but I will order a new sensor incase I mess the original up. It’s not cool to stumble because you lose the performance that makes having the V8 worth having.

 

my truck pulls like a bitch right through the gears, i tried that tps drilling and it just threw a code, than the rpm would go and down while at idle, 106 for a new sensor, try switching out the spark plugs to cooler ones, that will help out.

 

Graythang do you have a powerwire in/on?

 

The power wire is on but I took it off to see if it made a difference and it stumbled even worse with the power wire off. This explains why the power wire works because it tricks the ECM with cooler ambient air reading and that’s when these engines run best. I bought new plugs and will install them today but I have my doubts. I bought the 3923s again. If I can’t this right I burning the truck in the dealer’s lot. lol. I’m so tired of issues. Last Dodge for sure.

 

Even though mine is a Mitsubishi, I'm feeling the same way. First and last.