Acting up again

[otanisan]

Well friends last week I installed new fuel pump wich I posted in diffrent post ,so now it's starting to idle low again at ir surges below 500 rpms ,I'm thinking of dropping fuel tanknand see if it has trash in it, last week I pulled bed off ,so I'm thinking it's dirty gas tank?

 

[Jkidd]

You might check and see if your converters are stopped up. Mine did the same thing and thought that it was file pump/filter and ended up being a plugged up cats.

 

[otanisan]

I deleted them weeks ago ,and yes one was bad ,new crank sensor new throttle body, new pedal sensor, new plugs too

 

[Daw14]

Did you use OEM sensors or aftermarket? Aftermarket can cause many weird issues.

 

[otanisan]

Yes all after market but I have update ,I sprayed carb cleaner on intake and right behind ac compression I noticed rpms dropped, so I pulled intake and all seals wer shot , I replaced them bout 3 hour job , and so far idle perfect , today I'm bout to test drive but I really think it maybe PCM, if that's the case I guess it's fleabay time

 

[otanisan]

Update no more high idle at start up! And I drive it in morning cold ,so far so good and it hast shut off , could intake leak been causing all these issues?

 

[Dean2]

Yes it could. Intake gasket leaks let way more air into the system, meaning the computer needs to add a lot more fuel. You should have noticed a big drop in your fuel mileage with those big an intake leak. The stumble is most noticeable at idle because it is harder to match fuel to air. With more revs, it just adds more fuel to keep you as close to 14:1 as it can, and what you usually see when underway is lack of power under hard acceleration or pulling bigger hills. Sort of the same symptoms as a fuel pump going south.

 

[otanisan]

Ya huge drop in mpg , so I just drove it again 40 min round trip ,and wow the dead stop take offs are alot diffrent it pins u in seat! And it hasn't stumbled or shut off...

 

[otanisan]

Oh btw idle is bout 500 ,I wonder if that's ok fr an older 04 Hemi

 

[Dean2]

I like it better at 750 to 800. Keeps the oil pressure higher at idle.

 

[otanisan]

Thanks Dean for taking the time to respond ,and I hope some sees this thread and see how vital it is to check or change intake gaskets