Hello,
The earlier pumps had just the top solenoid which is a starting aid. Later came the pumps with two solenoids. A second lower solenoid was a fuel shut off device which moved the rack to full lean (no fuel) during decelleration. This was an emission device. The latest version of the IP was improved so that no starting solenoid (top solenoid) was used and it was illimnated all together. Only new replacement pumps or only the latest versions had the starting solenoid illmiinated. These latest versions did have the lower emission solenoids (fuel shut down).
Joe
I have the R24W FI pump which has no solenoids be they top or bottom on the back of the pump.
My 1971 280SL is a USA delivery, so should I assume that the pump has been changed out at some time?
Based on the pump should I also assume that the speed relay and relay box are no longer active?
Car has passed state emissions testing over the past six years.
Cold start with no problem.
Trying to wake the car up this year and it ran, but after 5-10 minutes stalled, initially able to start, but then only crank.
Narrowed it down to an aftermarket coil ( KEM U12K with no ballast resistor ).
Transistor ignition has been disconnected, so I ordered a Bosch red coil with the red ballast resistor.
If the coil was the "only" problem, I'll run it for a while and then consider a Pertronix module.
Any experience with the Ignitor ( 1864LA ) versus the Ignitor II ( 91864LA ) ?
Thanks !
Ed A.