Help- 500sel Knocks Off
 

When I Start My 87 560 Sel It Will Run For About 3 Seconds Then Knocks Off As If I Turned The Key Off. I Can Start It Over And Over And Still Only Runs For A Few Seconds Then Quits. It Will Do The Same Thing Each Time Whether At Idle Speed Or With Part Throtle.

Got Gas This Afternoon, Could It Be This? REALLY STUMPED.

Changed Radiator Out This Am But Drove It About 25 Miles To Get Gas Afterwards So I Don't Think It Has Anything To Do With That.

Any Suggestions Would Help??

Thanks

John1

Ps Have Only Had The Car A Month, Is There Any Type Of Anti-theft
Devise From The Factory I May Have "hit??

no anti theft
 

that i am aware of interconnected to engine.

it has gas, yes?

then it may be a fuel pump relay? i am guessing really.

tom w