PeachParts Mercedes-Benz Forum

PeachParts Mercedes-Benz Forum (
-   Vintage Mercedes Forum (
-   -   '77 450SL No Start (

jlmccuan 07-17-2008 09:47 PM

'77 450SL No Start
Sure could use some assistance. Here's what I know.

Car was driving normally, died and no restart.

Engine cranks normally, no spit or sputter, no start.
Fuel pressure and volume at fuel distributor normal.
Ignition delivering good spark to plugs.
New distributor cap, rotor, wires, and plugs.
New fuel pump.
Cold start valve sprays.
What other info do you need for diagnosis?

Thanks for your help.

vwbuge 07-17-2008 10:56 PM

I am not real familiar with gas engines but how many miles and when was the last time the timing chains were checked/replaced?

jlmccuan 07-17-2008 11:41 PM

It's at about 80,000 miles. I got the car recently and have found no mention of timing chain replacement in the maintenance logs. Cams are turning while cranking.

ctaylor738 07-23-2008 01:52 PM

How did you check for fuel pressure?

Is the pump running while you crank the starter?

Are the plugs wet or dry?

79Mercy 07-23-2008 01:54 PM

dump some gas in the intake and see if it sputters. If not then check the compression.

ja17 07-23-2008 06:54 PM


If you have air, fuel, spark on time and compression, the engine will run. Good advice on checking with starting fluid. Check to see if the spark is on time (going to the right cylinder when it is on its compression stroke). Air is almost a given. A quick compression check will tell you if the timing chain or distributor jumped!

zooklm 08-24-2008 06:34 PM

Did you check the ballist resistors? there are 2 of them on the left fender I think. They look like a long rectangular prism and have wires connected at both ends. The mercedes engine manual should have the resistance listed. I had one go out once and it would not start until I replaced the bad one.
Good luck,

All times are GMT -4. The time now is 10:09 AM.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2018, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2018 Pelican Parts, LLC - Posts may be archived for display on the Peach Parts or Pelican Parts Website