1991 420SEL died on road, won't start back up


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1991 420SEL wont start :( 120k miles, excellent shape
Some troubleshooting Ive done: 1. Replaced starter/overload relays 2. Replaced distributor cap/rotor 3. Replaced fuel/air filters 4. Temporarily replaced fuel distributor 5. Replaced battery 6. Checked fuses in the engine compartment
Its getting gas to through the fuel distributor. The timing chain appears to be in great shape. No check engine light. No oil leaks. All fluid levels good.
I am wondering if someone has a similar situation and can give me some ideas where else to troubleshoot.
Thanks, Ron in Salem
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<HTML> <HEAD> <TITLE>1991 420SEL died on road, won't start back up</TITLE></HEAD> <BODY> <FONT FACE="Verdana, Helvetica, Arial"><SPAN STYLE='font-size:14.0px'>1991 420SEL &#8211; won&#8217;t start :(<BR> 120k miles, excellent shape<BR> <BR> Some troubleshooting I&#8217;ve done:<BR> </SPAN></FONT><OL><LI><FONT FACE="Verdana, Helvetica, Arial"><SPAN STYLE='f= ont-size:14.0px'>Replaced starter/overload relays </SPAN></FONT><LI><FONT FACE="Verdana, Helvetica, Arial"><SPAN STYLE='font-= size:14.0px'>Replaced distributor cap/rotor </SPAN></FONT><LI><FONT FACE="Verdana, Helvetica, Arial"><SPAN STYLE='font-= size:14.0px'>Replaced fuel/air filters </SPAN></FONT><LI><FONT FACE="Verdana, Helvetica, Arial"><SPAN STYLE='font-= size:14.0px'>Temporarily replaced fuel distributor </SPAN></FONT><LI><FONT FACE="Verdana, Helvetica, Arial"><SPAN STYLE='font-= size:14.0px'>Replaced battery </SPAN></FONT><LI><FONT FACE="Verdana, Helvetica, Arial"><SPAN STYLE='font-= size:14.0px'>Checked fuses in the engine compartment<BR> </SPAN></FONT></OL><FONT FACE="Verdana, Helvetica, Arial"><SPAN STYLE='font-size:14.0px'><BR> It&#8217;s getting gas to through the fuel distributor. &nbsp;The timing chain appears to be in great shape. &nbsp;<BR> No check engine light. &nbsp;No oil leaks. &nbsp;All fluid levels good.<BR> <BR> I am wondering if someone has a similar situation and can give me some ideas where else to troubleshoot.<BR> <BR> Thanks,<BR> Ron in Salem<BR> </SPAN></FONT> </BODY> </HTML>
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Replacing parts is a expensive way of troubleshooting. -First check if you get a spark at the plug. Be careful while checking the spark, modern systems give a very high voltage!! -Then check the timing of the ignition. -If your ignition works as it should and the valves are ok it should be the fuel system.
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Thank you, Rob. We fiddled with the timing today to see if it would change anything, but no luck. However, I think you're right, and we will see what else we can do about it. I did read that there is a sensor wire that could be at fault.
Ron in Salem
On 3/9/07 5:23 PM, in article 45f207ac$0$323$ snipped-for-privacy@news.xsall.nl, "RobP"

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1991 420SEL died on road, won't start back upI think it is fuel pump relay. Check the date stamped on the isde of the unit... it is probably very old.
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Thank you, Tiger. I mistakenly wrote that I had replaced the starter relay, but it was actually the fuel pump relay that I had changed.
On 3/10/07 5:12 AM, in article S8yIh.2$ snipped-for-privacy@newsfe12.lga, "Tiger"

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<HTML> <HEAD> <TITLE>Re: 1991 420SEL died on road, won't start back up</TITLE></HEAD> <BODY> <FONT FACE="Verdana, Helvetica, Arial"><SPAN STYLE='font-size:14.0px'>Thank you, Tiger. &nbsp;I mistakenly wrote that I had replaced the starter relay, but it was actually the fuel pump relay that I had changed.<BR> <BR> <BR> On 3/10/07 5:12 AM, in article S8yIh.2$ snipped-for-privacy@newsfe12.lga, &quot;Tiger&quot; &lt; snipped-for-privacy@hotmail.com&gt; wrote:<BR> <BR> </SPAN></FONT><BLOCKQUOTE><FONT FACE="Verdana, Helvetica, Arial"><SPAN STYL= E='font-size:14.0px'>I think it is fuel pump relay. Check the date stamped on the isde of the unit... it is probably very old.<BR> <BR> </SPAN></FONT></BLOCKQUOTE><FONT FACE="Verdana, Helvetica, Arial"><SPAN STYLE='font-size:14.0px'><BR> </SPAN></FONT> </BODY> </HTML>
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Re: 1991 420SEL died on road, won't start back upThen I would check timing chain due to possible slippage that may be caused by bad tensioner. You need to match the timing mark to the #1 cylinder..
I would also check the distributor... possibly slipped due to loose or missing bolt.
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1991 420SEL died on road, won't start back upnot on the 420 but had a very simular problem on a 500 after I put injector cleaner in the fuel tank, it pluged up the catalitc converter and it just stoped. cleaned mine out .
face="Verdana, Helvetica, Arial"><SPAN style="FONT-SIZE: 14px">1991 420SEL wont start :(<BR>120k miles, excellent shape<BR><BR>Some troubleshooting Ive done:<BR></SPAN></FONT> <OL> <LI><FONT face="Verdana, Helvetica, Arial"><SPAN style="FONT-SIZE: 14px">Replaced starter/overload relays </SPAN></FONT> <LI><FONT face="Verdana, Helvetica, Arial"><SPAN style="FONT-SIZE: 14px">Replaced distributor cap/rotor </SPAN></FONT> <LI><FONT face="Verdana, Helvetica, Arial"><SPAN style="FONT-SIZE: 14px">Replaced fuel/air filters </SPAN></FONT> <LI><FONT face="Verdana, Helvetica, Arial"><SPAN style="FONT-SIZE: 14px">Temporarily replaced fuel distributor </SPAN></FONT> <LI><FONT face="Verdana, Helvetica, Arial"><SPAN style="FONT-SIZE: 14px">Replaced battery </SPAN></FONT> <LI><FONT face="Verdana, Helvetica, Arial"><SPAN style="FONT-SIZE: 14px">Checked fuses in the engine compartment<BR></SPAN></FONT></LI></OL><FONT face="Verdana, Helvetica, Arial"><SPAN style="FONT-SIZE: 14px"><BR>Its getting gas to through the fuel distributor. &nbsp;The timing chain appears to be in great shape. &nbsp;<BR>No check engine light. &nbsp;No oil leaks. &nbsp;All fluid levels good.<BR><BR>I am wondering if someone has a similar situation and can give me some ideas where else to troubleshoot.<BR><BR>Thanks,<BR>Ron in Salem<BR></BLOCKQUOTE></SPAN></FONT></BODY></HTML>
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Thanks for all the great help. Its time for a rebuild, unfortunately. 120k miles and the timing chain slipped. Otherwise, its a great car.
Ron in Salem
On 6/6/07 3:56 AM, in article snipped-for-privacy@corp.supernews.com, "john

1991 420SEL &#8211; &nbsp;won&#8217;t start :(<BR> 120k miles, excellent shape<BR> <BR> Some troubleshooting I&#8217;ve &nbsp;done:<BR> &nbsp;<BR> </FONT></SPAN><OL><LI><SPAN STYLE='font-size:14.0px'><FONT FACE="Verdana, Helvetica, Arial">Replaced starter/overload relays &nbsp; </FONT></SPAN><LI><SPAN STYLE='font-size:14.0px'><FONT FACE="Verdana, Helvetica, Arial">Replaced distributor cap/rotor &nbsp; </FONT></SPAN><LI><SPAN STYLE='font-size:14.0px'><FONT FACE="Verdana, Helvetica, Arial">Replaced fuel/air filters &nbsp; </FONT></SPAN><LI><SPAN STYLE='font-size:14.0px'><FONT FACE="Verdana, Helvetica, Arial">Temporarily replaced fuel distributor &nbsp; </FONT></SPAN><LI><SPAN STYLE='font-size:14.0px'><FONT FACE="Verdana, Helvetica, Arial">Replaced battery &nbsp; </FONT></SPAN><LI><SPAN STYLE='font-size:14.0px'><FONT FACE="Verdana, Helvetica, Arial">Checked fuses in the engine &nbsp;compartment<BR> </FONT></SPAN></OL><SPAN STYLE='font-size:14.0px'><FONT FACE="Verdana, Helvetica, Arial"><BR> It&#8217;s &nbsp;getting gas to through the fuel distributor. &nbsp;The timing chain appears to &nbsp;be in great shape. &nbsp;<BR> No check engine light. &nbsp;No oil leaks. &nbsp;&nbsp;All fluid levels good.<BR> <BR> I am wondering if someone has a similar &nbsp;situation and can give me some ideas where else to &nbsp;troubleshoot.<BR> <BR> Thanks,<BR> Ron in Salem<BR> </FONT></SPAN></BLOCKQUOTE><SPAN STYLE='font-size:14.0px'><FONT FACE="Verdana, Helvetica, Arial"><BR> </FONT></SPAN></BLOCKQUOTE><SPAN STYLE='font-size:14.0px'><FONT FACE="Verdana, Helvetica, Arial"><BR> </FONT></SPAN> </BODY> </HTML>
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