getting a hesitation at @ 4000-4500rpm on accel, 2.0 d-jet 75, mostly new F.I. stuff , TPS board new etc Options

[DRPHIL914]

After replacing the tps board i no longer get that bucking etc when just cruising along, but i still get this once and a while under heavy load, like acceleration , top end of 3rd or 4th gear.

and i'm wondering since this does not happen when just cruising, that is could be the richness setting of full load from the MPS??

MY MPS is a correct used one- tests good and vac is good.no leak, but i bought used , someone pulled this and re-sealed it, and the epoxy plug is missing, and when i first put it in it was very heavy on the lean setting. I have since adjusted the small screw for the idle and across the board richness. and now have a very steady proper warm idle. could be the full load setting is off, , or could the TPS still not be quite set exact?
(also running a electronic spark module- hot-spark, ) all new plugs wires coil seals etc etc etc, no exhaust leaks- new SSHE with triad exhaust 1 year old.

any other suggestions. - could the advance/timing be off just enough that this would not show unless at full load last timed 250 miles ago was right on, and this was there at that time too.

thank s for advice.

phil

[r_towle]

with a meter you should see it sit mostly rich...all the time.
That is really the perfect spot....
Its a drive, pull over and adjust, then drive again game...
Takes a few tries and its all set...
They the meter is just for any anomolies.
I use a portable one...cause once it is set, I am done watching it.

Air cooled cars need to run richer than water cooled cars....

RIch

[ChrisFoley]

with a meter you should see it sit mostly rich...all the time.

Yep.
With the Autometer gauge I aim for the 1st 3 green lights from the yellow band.
You'll see a small drop in the richness as the engine warms up and the CHT resistance changes. Other than that it should be possible too set the MPS to keep the reading nearly constant, but a little richer at WOT.