map sensor vacuum location

[rammit11]

I was inquiring to see if anyone has tried going to a port directly on the intake manifold vs. the throttle body for the map sensor('98 xj 4.6 stroker ) and if there was any difference as to how the engine runs. I have a slight ping under load at around 1200 rpms when driving up slight grades ,changing the throttle slightly lighter seems to help make it disappear and was wondering if the map sensor is seeing to low of vacuum and causing this to happen . Please correct me if I am thinking backwards on this, lower vacuum = lower voltage leaning things out and higher vacuum = higher voltage making things richer. I would be running some tests on this myself but I am short on time right now. Thanks for any insight on this.

[IH 392]

You want a nice smooth signal for the map sensor, putting it on a port will see it fluctuate with that cylinder and the might run fairly poorly?

[cruiser54]

I switch all my Renix Jeeps from throttle body vacuum source to intake manifold vacuum source.

[jeepxj3]

I switch all my Renix Jeeps from throttle body vacuum source to intake manifold vacuum source.

To the intake manifold plenum and not to just 1 intake runner, right?

[cruiser54]

I switch all my Renix Jeeps from throttle body vacuum source to intake manifold vacuum source.

To the intake manifold plenum and not to just 1 intake runner, right?

I move the IAT sensor to the air cleaner and put a vacuum fitting in it's place.

[rammit11]

Thanks for the suggestion to move iat. I did move mine and after about a week the computer has adapted to the change and pinging is all but gone and is running like a different vehicle.

[cruiser54]

Seriously? That's one to store in the old memory banks.......

[cruiser54]

I haven't done a write-up on it yet, but I do have some photos.

all my Tips can now be found in one location:
www.cruiser54.com