Alright, the fuel distributor plunger ain't leaking, where's the gas going??

[Cap'n Carageous]

89 M103..... I disconnected the injector lines, separated the fuel dist from the air chamber, bridged terminals 7 & 8 on the fuel fump relay socket with my multimeter and it read 7.8 amps to start with and fell to 7.2 in thirty seconds. The wires on the multimeter started getting quite warm. But, there was NO gas leaking from the plunger in the fuel distributor. When I manually depressed the pressurized plunger, gas flowed through ALL the injector lines at the same rate. So, WHERE is all this gas coming from that's puddling in my intake???

[Cap'n Carageous]

By the way, I had a pressure guage plumbed into the cold start injector port, which I assume would be considered upper chamber pressure. As long as the fuel pump is running it read 5.5 bar and 2.5 bar after the pump is switched off. In a previous test it held 2.5 bar for over 72 hours. Injector lines #4 and #6 had slight fuel drips at fuel system pressure but stopped dripping at rest pressure.

[Cap'n Carageous]

TTT. Come on, somebody has an answer to this. Where are the techs???? Yall wake up out there!!!!

[psfred]

Cold Start valve leaking?

Peter

[mhingram]

Is it in the air chamber, if so check the EHA it may be leaking. By the way you can order the seals seperately so try those before the eha itself.
m

[Cap'n Carageous]

As I said, the cold start port on the fuel distributor was connected to the pressure guage, so that isn't the problem. The EHA is not leaking externally and checks out fine within the electronic test procedure in the W124 CD. Now, is it possible that the EHA could be leaking internally, thus raising the upper chamber pressure and still check out ok with current draw, which is within spec?

[sbourg]

Did you have the injectors connected? If not, there was probably not enough back pressure in the injector lines to duplicate actual running conditions. The plunger seal is ONLY designed to function when the plunger is seated. Since the injectors come out easily, it would be easy to redo the test with them connected, and a side benefit would be a check of the spray pattern.

Steve

[mhingram]

yes the current assumes that the system is fine and not leaking, it would not know if it was.
m

[Cap'n Carageous]

How is the default setting for the EHA determined? In other words when the system is in open loop, what does the EHA revert to and how can that fuel flow be measured ?

[mhingram]

cap'n, While I am no expert. I believe that if the system is open the EHA will sit at 0mA and not fluctuate. When closed the current will vary whether it needs a rich or lean mixture depending on the requirements of the cis brain (ECU). Now measureing it I can not help you I am afraid, have to pass you to steve.
m

[Cap'n Carageous]

Here's my thought path. A certain amount of fuel is passing through this 'controlled leak' (EHA) for tweaking the air/fuel ratio. So can it get 'stuck' allowing the maximum amount to 'leak' through at all times? I'm seeing a lot more posts on the different forums lately concerning increased fuel useage.
If the KEIII system can run in limp mode fairly well without electronic assistence, then why would it suddenly start gulping fuel? We all read Freestyler's horror story. I'd like to see a lot of people not have to use the

radiator cap principle to get a solution.

[mhingram]

Cap'n,
Has your gas mileage gone up recently. If it was stuck open the car would be running very rich and the reading at the EHA would reflect the computer trying to lean out even if it was stuck open, the system would try an lean it. So check your EHA readings. Also your emission gases would be pretty bad too.
thanks
m

[Cap'n Carageous]

Is it possible for enough fuel to pass through the EHA to send the gas mileage to 10 MPG?

[mark cummins]

Check The EHA ..Remove it and Inspect it for cracks and Leaking o/rings 2 ..I Have replaced a Few for this problem

Also remove the Plunger at the Fuel distributor and Inspect it for Wear/Scuffs..I Have Seen them stick..and Give the same problem...leaking Injectors..loss of Fuel pressure

[Cap'n Carageous]

Thanks Mark. There are no external leaks on or around the EHA. I have replaced the plunger seal and the the plunger looked brand new, no scuffs or anything. It also moves freely in the housing. So, back to the question, can that much fuel pass through the EHA.