04-07-2009, 02:01 PM
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Registered User
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Join Date: Nov 2005
Posts: 11
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Running Problem '87 190D 2.5T-HELP!!!
HELP!!! Desperately seeking sound advice to resolve turbo diesel Baby Benz issues. My folks are visiting, having driven Dad's 1987 190D 2.5 Turbo from the mid-west here to the Rocky Mountain west. The car is an automatic with ca. 235K. The car has always been serviced by certified MB mechanic and properly maintained. We are the second owners. They experienced NO problems enroute, but once here the following problems began:
- Fluctuating curb-side idle (sometimes nothing, sometimes a little & mostly a lot).
- Once hot (even within a few miles) the car will usually not restart.
- If it does restart, requiring a great deal of cranking over, the idle is very weak, fluctuating considerably & often stalling out.
- Around town driving is barely possible, requiring double-footed driving or the car will stall at every stop.
- Cold-cranking the car is perfect, with the car starting immediately after glowing.
- Once the car cools down (two-three hours) the car will always restart flawlessly.
- The car can be driven at normal or highway speeds with no problems what-so-ever as long as no stops are made. However, if the car is highway driven and one must stop for a traffic jam, the car will stall & possibly restart, but with great difficulty.
Dad & I have preformed the following services at dealer & independent mechanic's recommendation:
- Replaced primary & secondary fuel filters.
- Tested & confirmed operation of altitude compensator (mounted behind battery).
- Tested & confirmed operation of overload protection relay (mounted behind battery).
- Removed fuel tank to check for debris/algae. Replaced old, but clean fuel tank screen.
- Removed fuel thermostat housing & replaced faulty 'O'ring & plastic cover with fuel nipple (mounted lower DS below inj.pump).
- Removed & inspected injection pump fuel delivery pump (mounted lower DS on inj.pump). Pump was clean with seals appearing intact.
- Removed & cleaned intake manifold mounted turbo pressure switch.
- Vaccuum tested fuel shut-off diaphragm (mounted on top rear of inj.pump).
- Replaced all rubber lines between fuel thermostat housing, fuel pump & fuel heat exchanger.
- Unplugged idle control solenoid (per dealer suggestion) to see if car dropped to low, steady (non-fluctuating) idle, which it did. (Solenoid is mounted on very rear of inj.pump.)
Is there something we've over-looked?? What else could be causing these problems?? We've hopefully ruled out the injection pump as well after consulting several diesel injection professionals (Diesel Injection Service, STL, two Denver MB dealers, two independent MB shops & an inj. pump rebuilding company in Albuquerque, NM) who have told us that between them, they've only experienced two defective/failed injection pumps at that mileage. Short of an expensive visit to the dealer/MB shop, we're hoping to resolve this issue ourselves. Your input would be greatly appreciated so the folks can finally return home.
This same information was posted on the MBCA Tech Forum, but with no substantial results. Hoping someone here can come up with a final, sound solution to these aggrevating problems.
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