Pressure is holding at 40+PSI when not running? How long did he leave the
pressure gauge on during this stage?Fuel pressure about 75PSI when running?
Longer cold and hard hot start at the same time? How hard of hot start do
you have? Hot engine, and 10 minutes later is like forever and must step on
gas pedal to get it started... that once it started rough as hell?
Not sure, at least overnight (I know that), but it may have been more.
A little longer than usual, but not too much longer. Maybe 3 seconds.
Occasionally it will take forever to start and I'll step on the gas and it
will stumble to life, and then smoothed out. When he richened the mixture,
it helped a little bit, but it made the car run rough at idle and in
Ahh... okay. How is the cold engine acceleration? Hesitate a bit? Until
I have eliminated fuel pump, accumulator, pressure compensator on the fuel
distributor. The above answer will tell me about your warm up regulator.
I don't want overnight pressure reading. The pressure can be zero and car
would start up fine. I want the pressure reading in 15 minutes... to 40
The only problem is warm up regulator would not affect hot starting.
Nope. The only thing is that sometimes when it starts (hot or cold) it
stumbles to life, but there is no hesitation when cold.
That's not the little thing that pumps hot air into the engine is it? That
Really, the overnight pressure could be 0 and it would start up fine? Didn't
know that. I can only assume that they checked it out properly.
If the engine is too rich, would that also effect starting? I suspect this
because the mechanic had set the lambda to 2volts, and then when I told him
it wasn't starting right, he richened it beyond that. Once he riched it
beyond that (very little), it started shaking a little at idle, especially
Warm up regulator is not at fault here as you said... it is that thing in
front of engine with two fuel line hooked up on the top... very expensive
sucker but can be obtained cheap if you buy Delorean's version instead...
Enrichening doesn't help in your case... I don't know what to tell you
Rich...we eliminated everything except the fuel distributor.
Rich would start alot easier than too lean but too rich is also too hard to
start. I don't use voltage to set the fuel mixture. Tell him to set it
leaner then normal to see if it helps.
Believe it or not... I learned this from MB only mechanic who has been
working on it for over 35 years... a can of carburator cleaner...
Take the filter housing off... the adjustment is as this... counterclockwise
is leaning out... clockwise is enrichening fuel mixture.
You start by leaning it out (counter clockwise) until it gets rough then
back off... do a bit of a turn at a time... 1/8 of a turn... and keep count
so if you (for any reason) want to bring it back to original setting.
Once it get rough... back off... enrichen again so it is smoother. Squirt a
bit of carb cleaner into the intake and listen carefully... if the engine
slightly hums higher, enrichen just a bit more... a very slight raise in
You want to get to the point where you can't feel or hear any diffference in
engine humming. Very small adjustment is needed.
If the engine stumbles, then it is too rich.
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