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Car Forum / Mercedes-Benz Cars / June 20071991 420SEL died on road, won't start back up
1991 420SEL won¹t start :( 120k miles, excellent shape Some troubleshooting I¹ve 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 It¹s 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 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. 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$323$e4fe514c@news.xs4all.nl, "RobP" <rob@nomail.com> wrote: > Replacing parts is a expensive way of troubleshooting. > -First check if you get a spark at the plug. [quoted text clipped - 3 lines] > -If your ignition works as it should and the valves are ok it should be > the fuel system. 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. 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$uA7.0@newsfe12.lga, "Tiger" <tiger0002@hotmail.com> wrote: > I think it is fuel pump relay. Check the date stamped on the isde of the > unit... it is probably very old. 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. 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 . 1991 420SEL - won't start :( 120k miles, excellent shape Some troubleshooting I've 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 It's 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 Thanks for all the great help. It¹s time for a rebuild, unfortunately. 120k miles and the timing chain slipped. Otherwise, it¹s a great car. Ron in Salem On 6/6/07 3:56 AM, in article 136d4n3li6hlp29@corp.supernews.com, "john eiguren" <bjbe@cableone.net> wrote: > not 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 [quoted text clipped - 23 lines] >> Thanks, >> Ron in Salem |
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