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Old 06-19-2005, 05:18 PM
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Question Need help with an 87 sel 420 that won't start

My dad has tried everything that he could think of to fix his car he changed the ignition coil and the ingition control module and it still will not start. Can someone help to troubleshoot this problem. It was running fine about a month ago but then it stopped and has not started since then.
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Old 06-19-2005, 07:45 PM
MikeTangas's Avatar
Senior Member
Join Date: Apr 2000
Location: So. Cal
Posts: 4,430
Did it stop suddenly while running?

You should probably pull the left valve cover to ensure the cam, chain and upper rails are intact. Almost every 4.2 I have seen that had jumped the chain also broke the left cam ( granted I have only seen a handful though).
Mike Tangas
'73 280SEL 4.5 (9/72)- RIP
Only 8,173 units built from 5/71 thru 11/72

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Old 06-19-2005, 07:49 PM
Smokiesman's Avatar
Bryson City NC
Join Date: Mar 2005
Posts: 182
Sure it is a electrical problem???

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Old 06-19-2005, 10:31 PM
jdc1244's Avatar
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Join Date: Apr 2003
Location: Lakeland, FL
Posts: 170
Did you check the fuel pump and pump relay?
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