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Old 10-31-2005, 01:46 PM
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Join Date: Oct 2005
Posts: 61
92 300e 2.6 wont start

Hi Im new to this board but ive been searching the archives to try & solve my problem but I cant seem to pin it down.

I have a 92 Mercedes 300E 2.6 that has 201,000 miles & is very well kept I bought it from my dad a thousand miles ago, ive been working on this car for him the last 10 years so I know whats been replaced because I did it.

Yesterday when pulling onto the freeway I punched the pedal & the car just died I pulled over & it wouldnt restart , I let it sit still no cigar. Came back a hour later (after getting a ride home from a nice person) in another car & it wouldnt start so I called my tow truck buddy & had it towed home. I could smell fuel big time when trying to start it but no leaks of fuel anywhere, I smelt it out of the exhaust & noticed when I had the air cleaner housing off I heard a popping noise coming out of the throttle body. I get spark at every wire & testing each plug good spark. I got fuel dripping from the injectors when cracking the lines & seemingly great fuel pressure at the fuel pressure regulator & the main fuel line coming from the pumps it gushes gas when the main gas line is disconnected & cranking over & of course I hear the fuel pumps running when turning the key.

The nice benefit I have is having a parts engine with a bunch of expensive parts to try so no shotgunning new parts.

I have replaced these parts in efforts to fix my car
* Fuel Pressure regualtor
* Fuel dist governor (EHA)
* Idle air control vavle (IAC)
* 6 new bosch sparkplugs

The OVP Relay was replaced 3 years ago with the upgrade one & the 2 fuses are intact (although I see some blue smoke like marks on the wiring harness to the ovp.

The fuel Injectors are fairly new 40,000 miles & the car only seen premium gas.

The cold start valve was replaced somewhere along the way.

The Dist Cap & rotor are only about 30,000 miles old (the original had 170,000 on it) replaced with a Bosch.

Im guessing its getting flooded somehow . O yea one more observation is that I only seen/smelt gas on one spark plug. the other plugs seemed blackish but no oily.

sorry for the ramble & thanks for anyone with ideas.

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Old 10-31-2005, 02:09 PM
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Join Date: May 2003
Location: bullhead city, az hot as hell
Posts: 301
did you do a compression check, also check timing
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Old 11-01-2005, 12:21 AM
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Join Date: Oct 2005
Posts: 61

Ok I got it started now, the problem seems odd to me! I removed the Dist Cap & the rotor that is secured by three screws just fell off. This shaft inside snapped off my repair manual calls it "Drive dog" shaft. The Performance products catalog calls it "dist rotor bracket". Anyhow I took the one off my parts engine & now it starts but it smoked like a diesel juiced to the gills on waste oil! I suppose the flooded raw gas in the chamber & exhaust is getting spewed out the smoke cut way down after 5 minutes of running but it wont run on its own I need slight pedal to keep it going (approx 800 rpms)

Im hoping the extra gas is gone by morning?

Remember if it has tits or wheels its gonna give you problems.
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Old 11-01-2005, 01:41 AM
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Join Date: Oct 2005
Posts: 4
I would definily check the dwell angle of the ignition system (timing), check also the advance mechanism.

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Old 11-01-2005, 07:49 AM
Registered User
Join Date: May 2003
Location: bullhead city, az hot as hell
Posts: 301
first thing draon the oil because its probably full of gas

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