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Squid 06-08-2001 12:12 PM

I reported having stalling problems earlier on my 89 300CE. I changed the fuel pumps, fuel filter and got a major tune-up but still the same problem. I decided to clean the contacts on the fuel module, OVP etc and now it only cranks and won't even start. I changed the oVP relay just in case, but still same problem. I pulled out one of the spark plug wires and tested for spark (w and w/o plugs) and found out I didn't have a spark! Which made sense because I can hear the fuel pumps going and smell fuel at the muffler end. Now I am perplexed, and I suspect that one of the modules behind the battery is for the ignition, and cleaning the contacts may have damaged it. Can anyone help? The red LED on the diagnostic terminal is constantly on now.

Benzmac 06-08-2001 09:10 PM

Take off all of the connectors and reinstall them. The main controller of spark comes from the black unit mounted to the driver's side inner fender. It is beside the air cleaner mounted to the fender inner.

There is one plug that is the crank sensor, without it, the car will not start. Take all of the connectors off and spray electrical cleaner on them and reinstall. IF this doesn't work, I would take off the coil wire from the distributor cap and install a plug in it. Crank it over and check for fire. If none, check the ignition coil. If you do have fire, replace the cap and rotor.

I would really suspect a crank sensor if you have had a stalling problem in the past.

Take loose the battery for a half hour or so also..

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