Question 2004 Pace Arrow 36B bad running 8.1 Vortec

[Newton36B]

Since both banks are doing the same thing, it very well could be a MAF
Intake leak could be it also.
Maybe the MAF is dirty or contaminated.
You should look at the MAF to see if the little sensor inside ( thermistor) is covered with schmutz.
You can clean them with an artist paintbrush and brake cleaner by spraying it and GENTLY brushing it loose with the brush.Then spray again to rinse the sensor.
If it is dirty ( which is likely/possible) that would caus ea lean condition like you are seeing.
Any air leak in the intake /intake hoses after the sensor can also cause the issue.Look for holes in the air intake tubing.
You may want to change the intake gaskets just to rule it out. But check the MAF first.

I've got a whole new list of things to check. Thanks

 

[Newton36B]

If the intake is leaking, on one side, you will be getting too much air in those cylinders and the O2 sensors will get a faulty reading. If there is a plastic cover on the engine, remove it. Start the eng.jine and spray water from a spray bottle along the mating surfaces. If it start missing you have a leak. I always use carb cleaner will will speed up the idle. But hate to recommend that because of the possibility of fire.
But, I think you have 2 problems.

I will give this a try, I thought the intake leak would run bad all of the time ?

Thanks

John

 

[DHudson]

I will give this a try, I thought the intake leak would run bad all of the time ?

Thanks

John

May not, if it's to REAL bad

 

[Newton36B]

May not, if it's to REAL bad

Tommorow were going to install a new MAF sensor and see what effect that has, the problem is that I have to drive it about 75 miles to get to act up !

 

[DHudson]

May not, if it's to REAL bad

"Not" real bad

 

[latech]

I will give this a try, I thought the intake leak would run bad all of the time ?

Thanks

John

I have had intakes that leak at Idle, at cruise, on decel only and all of the aforementioned. No real rhyme or reason there.

 

[Newton36B]

Yesterday was the first chance I have had to drive the motorhome since installing the MAF sensor, we drove about 175 miles with no problems or codes, I have high hopes that this has solved the problem. Thanks all for your help, I have been forced to learn a lot more about this engine than I expected.

Thanks again

John

 

[latech]

It best to understand your machine, even if you have to pay for repair. At least the price of repair ( when needed) makes more sense then...

 

[Newton36B]

I agree, at least I can discuss the issues with the shop, and after this situation I know I can take of plugs, wires, and coils myself. I bought a scan tool and it really helps point you in the right direction.

Thanks

 

[frankers]

Silly question, it didn't go into limp mode due to an overheated tranny did it/does it?

 

[Newton36B]

Silly question, it didn't go into limp mode due to an overheated tranny did it/does it?

No problem with the transmission, after installing a new MAF seems to have solved the problem, we have taken three short trips 300-400 miles and have not had any issues.