W126 500sec throttle

If the throttle is gently used ie. slowly pressed down then no problem...However if it is pushed down fast the engine gasps and nearly stops...Any ideas on this problem would be helpful..the car does everything else fine ..just this annoying problem Thanks Alan

[Benzmac]

If it has converted EGR on it, the valve can be sticking open, This sounds like a lean problem, so you should have the fuel pressures checked and look for an air leak.

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Benzmac:
Donnie Drummonds
1992 500E (very soon I hope
1981 280GE SWB
ASE CERTIFIED MASTER AUTO TECHNICIAN
SERVICE MANAGER FOR 14 BAY FACILITY
MERCEDES SPECIALIST 8 YRS
PARTNER IN MERCEDESSHOP.COM

[stevebfl]

Your car could be could have a number of different systems depending on the year and version.

I presume you have a simple K-Jet system. On this system the prime component for acceleration enrichment is the warm-up (control pressure) regulator. Loss of manifold pressure causes the control pressure to enrich by about .5bar.

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Steve Brotherton
Owner 24 bay BSC
Bosch Master, ASE master L1
26 years MB technician