The puzzlement continues....She won't start - Page 2 - PeachParts Mercedes-Benz Forum

#16 12-19-2003, 03:00 PM

Zorin,
See last post.

Since you have a manual transmission, were ever able to start it using the clutch and gear? (Ignition On, 1 or nd gear, downhill, let clutch go?)

Also, just in case, you might want to read out the output on pin 3 of the diagnostic port. Maybe for some reason you air/fuel ratio have changed.

How is this done?

The diagnostic port uses blinking lights, you count the blinks to read the code. When pushed no codes can be read, indicitating all ok.

zorin · #17 12-19-2003, 11:10 PM

The Fuel Injection Diagnostic port on my 300E is like a plug. You measure the signal at the end of plug 3 and different duty cycles (or voltage) would indicate a different problem or too lean/rich mixture. I am not sure if 190E has a similiar place.

pmckechnie · #18 12-20-2003, 09:05 AM

Go back to the first reply and reread it. It is the one that ask about compression. If the chain jumps a tooth or two, the engine may or may not start. It may still have some compression but it won't be correct, and the ign timing will be off.
So, check compression and cam timing.

#19 12-22-2003, 02:14 AM

Haasman,
Slight odor of fuel at tailpipe probably due to non combustion.
Fuel smell is higher in engine compartment.

Throttle body looks ok as well as linkage. There is a switch on the linkage. Will this keep it from starting if it is bad?

I am just about at my wits end on this. Usually I can figure this out with a minimum of help.

It was mentioned about a camshaft position sensor, the only sensor that I can see is down by the harmonic balancer.

#20 12-22-2003, 02:17 AM

Btw,
My son checked and when the piston comes up on compression he mentioned that he can see the pointer for timing.

haasman · #21 12-22-2003, 02:45 AM

You are getting spark .... some raw fuel smell in the tailpipe and especially in the engine compartment ....

The raw fuel smell in the engine compartment ... this bothers me.

Have you pulled the air cleaner assembly and looked for the source of the fuel smell?

Here is something, a bit off, but when I was trying to resurect the 190, a MBZ tech told me to bleed the fuel lines AT the fuel distributor. Never heard of such a thing. Did it and it made all the difference in running.

I am unsure whether you get get a bleed without it running.

I am sure we'll help you get this thing figured out and running!

Hang in there and keep us posted!

Haasman

#22 12-22-2003, 08:00 PM

Have bled the fuel lines at the fuel distributor before but has to be running.

Can't get a bleed w/o running the engine.Tried that.

Mercaholic · #23 12-23-2003, 06:00 AM

Silly question maybe - but have you had the main ECU checked out?

Mercaholic · #24 12-23-2003, 06:05 AM

In answer to your question about the switch on the throttle linkage - this is connected to the ECU and sets IDLE SPEED, so it works with the cold start system - pushes against the throttle lever and increases idles speed at startup.
If it fails and the throttle linkage is very tight on the 'closed' position, it may affect starting - but not in the way you have been experiencing.

#25 12-23-2003, 06:11 AM

So you mean that the computer behind the battery needs to be checked out?

sbourg · #26 12-24-2003, 09:30 AM

Quote:

Originally posted by glmoy
Compression should be good after all this car ran great until this happened. All hoses on including idle air hose in rear of manifold.

Fuel pumps have been replaced.

What next???????

The reason for checking compression is a quick check of timing chain integrity. If the cam is not turning, you will have no compression. Of course, you will also likely have bent valves or worse. This is an unfortunate possibility when the engine suddenly dies.

Steve