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Old 12-20-2002, 07:09 PM
Posts: n/a
Post '89 190E Stalling (I've done my homework!)

Hello Guru's!

I am yet another poster who is suffering from a "mystery stalling problem" with my 1989 190E 2.6 Automatic. The car stalls at low speeds while in a decel/braking situation. It will restart again immediately and may last another hour or may last 1 min before stalling again.
The problem is evident only while the car is moving...never while in Park or Neutral in fact I have run it at engine idle for an excess of 90 mins with the car in Gear and with the emergency brake set. It never once gave any sign of a problem. As soon as I released the brake and let the car roll (with no gas or brake...just rolling while in gear) it stalls. This particular test happened while in (D)rive but I have achieved the same results in (R)everse.
As stated in my subject line, I have some homework. Here is a list of what I have done/checked/verified/tested.

1. Replaced Fuel Pump Relay
2. Replaced Air Flow Sensor Plate Position Sensor
3. Replaced Hall-Effect Sensor
4. Verified good Fuel Pressure (3.2 bars)
5. Test Idle Circuit (.55-.6 amps at idle)
6. Test Ignition System (45kv at cap)
7. Test Lambda (fluctuating at 90%)(lean)
8. Replace all plugs (gapped at .045)
9. Replace plug wires
10. Replace Cap & Rotor
11. Checked Overvoltage Protection Relay (87E to 87L - 0 ohms)
12. Checked voltage from CIS unit Pin 6 to ground (0 to 12 volts fluctuating as vehicle is rolled)

And as you may have guessed...the stalling problem remailns...So....Whats next? I have a few thoughts and just wanted to get the opinion of this board before proceeding. Should I pursue...
  • Throttle Postion Switch
  • Vacuum Leak (not enough vacuum to move position indicator)
  • New CIS unit
  • Wiring harness
  • O2 Sensor

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Old 06-11-2003, 04:45 PM
Fritz13's Avatar
Registered User
Join Date: Apr 2002
Location: Eau Rouge
Posts: 10
Did you ever get this resolved?
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Old 06-11-2003, 09:02 PM
Registered User
Join Date: Aug 2001
Location: Evansville, Indiana
Posts: 8,150
Clean the idle valve, they stick when dirty, usually as a result of bad hoses. Causes problems most when stopping abruptly rather than slowly coasting down, as the valve has more time to open.

1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!
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Old 06-14-2003, 09:48 AM
MRPerformance's Avatar
Registered User
Join Date: May 2003
Posts: 24
I think the voltage fluctuation when the car is rolled is a clue worth pursuing. I'd suggest tracing that fault, paying particular attention to the various grounds. Somehow I think it's a ground problem.

Good luck and please post the final outcome.

'93 190 2.6 Sportline

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