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87 420SEL, starts and only runs a few seconds

18719 Views 41 Replies 9 Participants Last post by  waybomb, 
waybomb
87 420SEL, starts and only runs a few seconds - Still need help

Have a 1987 420SEL. 140,000 odometer.

Start the car, rpms come up slow, idles fine, then races and shuts off. If restarted immediately, the process becomes shorter. If a wait of a few minutes, the process may take 45 seconds.

3/4 tank fuel, replaced the fuel filter today, still has same problem. The pumps are running, air filter ok, no wires seem to be off anywhere.

Any ideas on what to check?

Thanks in advance.
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J
My 560 has been playing up too.. mine just cuts out at low revs, when approaching a junction... When restarting the fuel pump doesnt buzz at all.. I played around with a few things, tried a new fuel relay but no good..

Could it still be the idle relay?

It hasnt done it in a while but I know it will come back to haunt me at the worst possible time.
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