Install a new EGR and EGR pipe to the newer one on my 95 C280. Once completed, I notice the idle was not as usual. During the process of removing/installing the EGR pipe, I had to pull the injector rail and loosen the Intake Mani. When reinstalling the injector rail, I noticed that the seals looked dry but just put some oil on them. Drove the car for a week without improvements.

Thinking the seals was causing my unsteady idle, I ordered a set of upper and lower injector seals. Replaced all the injector seals, let the system prime and attempted to start the car. Car would not start! Got out and looked under the hood to find gas everywhere. The upper seal on Cyl 4 was spilling gas everywhere and all over the garage floor. Cleaned up everything and changed the seal with an extra one purchased.

Now, the car starts for 2 seconds and then stops. Will not start again for 3-5 mins, but only runs for 2 secs. Pulled and tested the spark plugs; they are dry and have spark. Tested at the fuel pressure relief valve and it squirted across the room. Got spark, got fuel, got air = No Start!! What should I try next??

 

Checked the fuel relay & fuse = good.

Checked the OVP relay & fuse = good.

Checked EGR valve operation = good..

Still trying to find the source of the problem..

Anyone have other suggestions?? Please help..

 

Did you look the ECU? Problably you have some kid of code error...
On my c200 kompressor one of the problems was that! Conecto to a star machine and VOILA!!! The car now start fine!

 

Thanks for your reply KompressorGpl.

Yep.. checked the ECU for codes with my Autozone cheapy reader. No codes found... Cant see if I have any MB codes... Do we have a manual way to read those codes??

 

Discovered that the fuel relay is clicking off when the car is started. Cant figure out why...

What would cause the fuel relay to turn off fuel?
Security system? short? what?

 

Hello! On my c200 I change that part just to make sure...
That part as a 30 amp fuse so it take with a lote of stress...
And is cheap...
But if it tic tic tic

 

Yep.. It goes ticky-tic-tic and off... Tried a spare one from my parts box and its doing the same.
But, Purchasing a new one tomorrow..

 

Installed new Fuel Relay today. Still wont start. Same thing as before..

 

Sounds tricky. Maybe you should take it to an experienced Merc mechanic or off to your local dealers?

 

From experience. If you work on one thing and have problems then that is usually where your problem lies. I know you have pressure to the injectors, but is that gas getting to the cylinders. This year car has a history of the wiring harness being bad with age. The insolation is biodegradable and the insulation turns to powder. If you moved the harness too much you might have created a short that is preventing the injectors from firing. I replaced my harness for about $500 and 4 hours work. I would check if the injectors are firing.

 

Thanks for your input.. I changed my wiring for the 2nd time in 2006. But I did look at the wiring before starting by lifting the tray above the injectors and looking at the wires and checking each injector (especially the end ones). They are all fine: no spider cracks or dryness, unwrapped some of the feeding harness and my wiring seem to be holding up good..

But, I dont want to overlook anything. How do I test fire the injector?


Also: Could I have triggered some safety shutoff when the injector seal spilled gas everywhere?? If so, how do I reset it?

 

I think you can reset the ECU by disconnecting the battery. I doubt that is the issue though. I would take a plug wire off and try starting the car then remove the plug to see if you see any gas on the plug.

 

Finally figured out what happened..

When the injector seal didnt hold and gas was sprewing out, the smart Mercedes system shutdown the ignition system by blowing the OVP relay which stopped the signal to the fuel relay... (note: the OVP fuse was still good)
...
Guess it kept me from Blowing Myself UP!!!

Once the OVP was replaced, the car started & runs without a problem.. This was a very painfull experience ! !

But now, Im on the road again!

A BIG Thanks to everyone here who assisted me thru this!!

 

LOL haha, that was a close call lol hehe. Good to hear your C280 is up and running again!

Mercedes-Benz cars are smarter than you think! Hehe :P

 

Good find, glad you are up and running again.

 

what I would do, I will doble check the injectors something is missing