yep, you are exactly right, its going to either be that or the tank
screen is plugging up. I am leaning more toward the overload valve
since the problem goes at goes. If the screen was plugging up it would
seem to me it would get worse and worse and finally not run at all
rather than it only doing it every once in a while.
[EMAIL PROTECTED] wrote:
In a message dated 1/30/2006 11:48:28 A.M. US Mountain Standard Time,
[EMAIL PROTECTED] writes:
My SD has it's moments of fuel pressure loss. You can be crusing down the
interstate and suddenly feel a power loss that lasts less than 1/2
second...something exactly like taking your foot off and back on the throttle. Also,
at cold start it's very rough and needs to have enough throttle to keep at
least 800-900 RPM to run somewhat smooth and not die. Glow plugs are barely 2
years old and the injector pump and injectors were replaced by the P/O (maybe
50kmi ago). I've replaced all the rubber fuel line from tank to primer in
the last 8 months.
I'm thinking from my experience in the semi-diesel world that I have a lift
pump that's weak. I read 07.1-145 "Checking fuel pump and bypass valve" and
it seems that the bypass valve can get clogged and needs to be cleaned and
the spring lengthened to increase tension. Is there anyone else that has had
an issue similar to this where cleaning the bypass valve fixed the issue or
did they have to replace the fuel pump?
Luther,
Don't overlook the possibility that it is the boost protection switch,
mounted on the intake manifold. These will go bad and cut fuel just as you
describe but at only 6 or 7 psi instead of 14-15 psi. When the switch closes it
interrupts the pressure signal to the ALDA and the engine gets fuel, the
equivalent of an unblown car, which feels fairly anemic
You can pull the wire from the switch to see if your problem goes away. Or
you can remove it and rig a test connection with your mitevac or air
compressor. Or a remote possibility is the turbo unloader valve is failing and the
pressure is excessive.
Good luck,
Jim Friesen
Phoenix AZ
79 300SD, 262 K miles
98 ML 320, 140 K miles
_______________________________________
http://www.striplin.net
For new parts see official list sponsor: http://www.buymbparts.com/
For used parts email [EMAIL PROTECTED]
To Unsubscribe or change delivery options go to:
http://striplin.net/mailman/listinfo/mercedes_striplin.net
--
Kaleb C. Striplin/Claremore, OK
89 560SEL, 87 300SDL, 85 380SE, 85 300D,
84 250 LWB, 83 300TD, 81 300TD, 81 240D, 81 240D,
76 450SEL, 76 240D, 76 300D, 74 240D, 69 250
http://www.striplin.net
