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k-jet tuning[200/81] posted by Chevy on
Friday, 7 April 2000, at 10:24 p.m.
is there anyway to tune a k-jet system without a CO-meter? (and get it close to normal)
Thanks!
Re: k-jet tuning[200/81] posted by Charlie on
Saturday, 8 April 2000, at 12:02 a.m.
With a dwell meter
Hook up to test connector in drivers side in front of shock tower
Red wire with black connector...just hanging there
set dwell meter on 4 cycle scale
78-80 B21 45deg
81-82 B21 55Deg
adjust by turning screw clockwise richen, counter to lean
Re: k-jet tuning[200/81] posted by Dave Heusser on
Saturday, 8 April 2000, at 12:25 a.m.
Charlie,
Valuable Info! What screw are we talking about here? Specific location for an old Carb boy, please. (1980 D Jet)
Dave Heusser
1980 244 GL/M46/250,000
Re: k-jet tuning[200/81] posted by Charlie on
Saturday, 8 April 2000, at 11:06 a.m.
Dave,
Here's where you need Don Foster's pictures.
It's hidden inside the fuel distributor. On my old '75 the fuel distributor was located in a different place, on the frone fender, and since I had taken this one apart to clean, I knew where the screw was.
on the 80 the F/D is jammed under the intake monifold and a real pain to get at.
First you need a 3mm Allen wrench - a long one, IPB sells one with a T grip but you can ususally find a similar one at a well stocked auto tool shop. A little allen key that usually comes in a set is too short.
Right in front of the part of the F/D that has the Fuel lines attached- that boxy part with the lines running out - is a small hole. Sometimes - but rarely, there is a cap on this hole. If you don't know where to look it's very hard to see back there. Try a mirror and a flashlight.
You've got to jam your had thru all that stuff back there and gently slip the allen wrench inot the hole and feel around with it until you feel it slip into the allen bolt.
Basically this "screw" adjusts the rest position of the air sensor plate, which pivots --as previouly mentioned in my description of the k-jet system.
if you push down with the wrench you move the plate.
With the car at idle: when doing the adjustment - you turn the screw, remove your hand from the tool - let the the idle stablize and take a reading. To be sure that you have adjusted it properly you should remove the tool because it's weight pressing on the screw will throw off the adjustment.
As they say first time is the hardest. once you know where the hole is and what it feels like when the tool is engaged in the allen bolt , it's a snap.
Re: k-jet tuning[200/81] posted by Don Foster on
Saturday, 8 April 2000, at 11:54 a.m.
Dave --
Since Charlie asked—here are several pix from the Volvo "CI Fuel Injection System" manual, section 2, group 24.
Charlie described it well. I'd only add that the hole is usually blocked by a ball bearing which you must first "pop" out. If you find no ball bearing, it usually means someone has been there before you.
Once you're done it's a good idea to again block the hole. This keeps dirt out and blocks an unmetered source of air. I've seen small plastic caps inserted—and that seems a good idea. Reinserting the ball beraing might be difficult.
The pix with the purple circle shows a distributor for a 6-cylinder engine, but it's essentially identical to yours. The circle indicates the adjustment access hole.
The second picture provides more detail, but the distributor is missing from the assembly in this pix. The adjustment hole is #7. You might be able to see that the fuel flow is determined by the position of a lever (#6) which is connected to the sensor plate lever (#3) via the adjustment screw. This screw controls the relationship between air flow and fuel flow.
Location of adjustment access port.
Illustration and description of Air flow sensor.