300E Engine Dragging?? - PeachParts Mercedes-Benz Forum

JohnM. · #1 03-09-2011, 05:38 PM

Just off the top of my head you could have someone turn the key over to prime the pumps while you are under the car. I would think you would be able to tell if one is not running based on noise or vibration?

350SL4spd · #2 03-09-2011, 05:43 PM

Quote:

Originally Posted by JohnM.

Just off the top of my head you could have someone turn the key over to prime the pumps while you are under the car. I would think you would be able to tell if one is not running based on noise or vibration?

I can usually hear it from in the car. Just not sure if I could tell that BOTH of them were working... And now that you mention it, I was getting a bit of a thump from the fuel pump(s) awhile back that I could hear when I primed it. went away at some point...

350SL4spd · #3 03-09-2011, 11:27 PM

OK. I pulled all the plug wires one at a time to see what cylinders were causing problems. Turns out #4 & #6 aren't firing. However, both plug wires at #4 & #6 were sparking off the head beautifully, so I have spark. I pulled the plugs on those cylinders and they were both bone dry. So no fuel.

Now things get more vague. I pulled the #6 injector and when I crank the car it wasn't spraying any fuel. (It didn't want to start w/ the huge vacuum leak that a missing injector creates). However, if I stuff the accelerator to make it start, the injector will spray a bit.

I have no idea what's normal or what could be causing the no fuel to these 2 injectors. Any ideas/advice?

Thanks.