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Old 07-23-2011, 10:34 PM
ps2cho's Avatar
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Join Date: Jun 2006
Location: Chandler, Arizona
Posts: 3,525
1987 260E Low power issue - Round 2

Starting new thread with updates and everything compiled.

Background:
Car ran great for over a year, averaged 21-22mpg.
Last Sept water pump blew and the car was running at 110C for a few days while I tried to diagnose what was happening, never overheated though.

MPG dropped to 12-13avg and power SUCKS. I would guess a 50% drop in power. Its just lifeless.

Parts Replaced / Tests done
  • Plugs/Wires/Rotor/Cap <--- done last year brand new
  • Compression Test GOOD -- average 180psi all cylinders, variance no greater than 5%
  • New fuel pumps, fuel filter, fuel tank strainer, fuel tank inspected, all fuel hoses replaced
  • Fuel Distributor + EHA brand new
  • O2 sensor new
  • Injectors are brand new + also checked spray pattern
  • Coil swapped with spare
  • Car goes into closed-loop. Duty cycle 55% and fluctuating
  • Fuel pumps now gets 1L in 30secs (spec is 1L in 40secs)
  • Fuel Pressures are 5.1/5.5 bar -- pressure holds @ 3.1bar. So pressures + holding pressure GOOD.

Ideas where to look now?
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