MFI part-load adjustment tool
 

I'm trying to tune my MFI and I'm at the part load adjustment stage.

The scanned version of the "check measure and adjust" manual is a little hard to read. Would anyone be good enough to confirm the size of the tool needed to make the adjustment ? I guess it's an allen key, 4 or 5 mm.

It definitely feels like the key I am using is engaging in something inside the pump, but I can't feel any clicks. Does this happen sometimes, or am I not engaging the mechanism. I've undone an allen bolt, just on top of the solenoid and a little below the warm-up regulator.

This is a 2.2 E.

TIA

Michel Richard

Michael,
You only use the allen head to remove the bolt on the outside. You need a lonnnnng flat screwdiver with a blade about 4mm wide. You can buy the tools in a set for about $40, or some people have used a thick welding rod and flatened the end. It needs to be about 12" long. Once you hit the right spot in the pump just turn it slowly until you feel the slot fall into place. Then left is rich, right is lean. I would only go 2-3 clicks at a time.Hope this helps.

Paul

I use a small pocket flathead screwdriver to adjust mine. There is enough room around the pump to insert it and carefully count the clicks you are turning. The only downside is that you have to remove the airbox first.

Great,

How far inside the pump is the adjustment screw ? I hear you when you say that the screwdriver needs to be 12 inches long, how much of that is inside the pump when you reach the screw ?

I'll try again tonight.

Thanks

one of the two adjustment screws is actually springloaded. i can't remember which one it is (part load or idle).

but when you start turning either one, keep track of how many clicks and what direction you have been turning. the 2 adjustment screws are the opposite of each other -- that is, on one of them, clockwise is leaner and the other, clockwise is richer.

Thanks,

Still, how far inside the pump does the screwdriver reach to engage the part load screw ?

Michel

Its actually about 2 inches inside the control. You don't or wouldn't want a 12 inch screwdriver unless you were going to work through the fan. That isn't necessary, take a small slotted screwdriver with a 3-4 inch long blade, cut the handle off and put a 90 degree bend in the last inch of the handle end . That way you can keep track of its position. Use a grinder to narrow the blade to 3 MM wide x 1mm thick if needed. You can use a welding rod or similar if a screwdriver is not available. Keep the tool level and turn without pressure until you feel the blade catch the screw slot (its a hex headed slotted screw). Then turn it one click at a time. If it doesn't click you may not have the blade in the slot. It can get inbetween the screw and the spring plates that make it click if not centered properly. It takes a little patience but its not difficult. Put the allen head bolt back in before running or oil will leak out.

Thank you.

I'll reporte any success !

Michel

The idle screw is the springloaded one. DO NOT push on the part load adjuster inside the pump. This can permanently damage the pump!!!