Hello, this is my first post. I have just tweaked the throttle stop on the back of the fuel injection pump on my 1978 300D. The power is now considerably increased.
My question is, does anybody know if there is a limit to how far I can turn up the fuel flow? For example, is there an internal component that I could damage by removing the screw entirely?
My question is, does anybody know if there is a limit to how far I can turn up the fuel flow? For example, is there an internal component that I could damage by removing the screw entirely?
Your power is limited because of how little air is available to your engine.
Yes, you can damage the injection pump by adjusting that screw too far in. It's function is to keep the accelerator from forcing the injection pumps internal linkages past a set point. I'd advise to turn the screw back where it was.
On top of the pump is a round object with a screw and locknut on the top. That is the ADA, it compensates for altitude. Loosen the locknut and adjust the screw CCW until you start to see smoke out the tailpipe or you don't feel a power increase after an adjustment. Black smoke will cause the exhaust temperatures to get very high and reduce engine longevity.
__________________ 1980 240D 3.0VNTi 220k miles Modifications (Link): OM617.952, 4-speed manual, GT2256V VNT turbo, W115 300D intake, ALDA/EGR/rack limiter removed, 3.46 diff, 15mm rear sway bar, Amsoil bypass oil filter, Mobil1 5W-40 synthetic oil and 15mm rear sway bar.
On top of the pump is a round object with a screw and locknut on the top. That is the ADA, it compensates for altitude. Loosen the locknut and adjust the screw CCW until you start to see smoke out the tailpipe or you don't feel a power increase after an adjustment. Black smoke will cause the exhaust temperatures to get very high and reduce engine longevity.
What does it mean if you've screwed out the ALDA as far as it will go and never see any smoke? The only time I *do* see smoke is when I start up in the morning with no glowplug time, and even that is only a second or two. Have 302K mile on an engine with a hell of a lot of blowby (pushes up on the EGR connection) -- have no idea what I can do about that but live with it, but I won't be investing in any $90-100/hr mechanic time.
This guy's car is a 78, so I assume it is a non-turbo car like mine. The only time I hear alda mentioned is on turbo cars. Does it make a difference on NA engines?
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