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'90 740GL idles rough under load after quick stop that stalled engine. 700 1990

posted by  mrjoeski on  Thu Oct 21 17:13 CST 2010
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last visit: Wed Jun 11 07:36 CST 2014
[RELATED]

I was cut off the other day and had to brake so hard that the enginge stalled. Later that day after driving about 20 miles, while sitting at a light, the engine began to idle rough and hesitate until RPM's were brought up to 750-1000.

The car idles fine in park or neutral and gets worse as engine load is increased (a/c or transmission load) The problem begins after the car is driven for about ten minutes and was intermittent for about 4 days. Last night I had time to change the fuel filter (Rex/Regina)hoping I just sloshed a bunch of fuel tank sludge into the filter. That seemed to work and I drove around for 20 minutes with a/c on and stopped numerous times with no problems.

This morning even when cold, the enginge idled rough with no load and was pinging as it struggled to idle. As I increased RPM's the engine still ran rough. I had to catch a flight so the wife took me to the airport.

Any thoughts on what might have happened during that hard stop and what to check when I get home next week would be welcomed.






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