1975 350SLC rebirth

Hi Jean Pierre,

if those are correct injectors - some L-Jetronic versions are also yellow - you should do MAP sensor leak test as described in chapter 4, verify water temp resistor and close fuel hose to cold start valve.

Dear Volker,

The cold start injector was stuck open! It's amazing how much petrol that thing dumps! I fitted the one from my spare 450 engine, it's fine.

Now waiting for the brake parts, and we can finally have a road test.

Thank you very much,

Jean Pierre 

Dear Volker,

Today I have driven the car for 40 kilometers! I have had so many problems with bad second hand fuel pressure regulators (new ones are not available apparently)
Finally I got round the problem by fitting a Malpassi adjustable fuel pressure regulator. To operate properly, it needs a free flowing return line to the fuel tank, so I located it near the tank and created such a return line. I replaced the regulator under the bonnet by a T junction.
Now I have a very stable 2 bar fuel pressure!
Thank you again for your help with this car! It still has a misfire but I am sure we will soon sort it out.

 

Dear Volker,

I am still in trouble... The car had a slight misfire, which has progressively gotten worse.
First I thought that is was ignition related, as it created misfires and felt like the engine was dropping some cylinders. After fitting a new distributor cap, a new condenser, a new coil (the old one was fitted with a horrible antitheft device) and substituting plug wires and rotor with our 6.9 a known runner, I am pretty sure it is NOT ignition related.
Now the only thing in the injection system that could affect some cylinders are the trigger contacts, so I am suspecting them.
You mention a duty cycle tool, is that a dwell meter? Should I measure the dwell with the engine running? Or the voltage a cross the points, still engine running?
Also the car seems to run better when cold, and the miss gets progressively worse the longer it's driven...

Best regards,

Jean-Pierre

Jean-Pierre

Hi Jean-Pierre,

yes just measure dwell on all 4 running contacts if you want to verify.

Hello Jean - Pierre,
is the thin cable well attached to the positive pole of the battery? The cable supplies power to the controller.
Hans-Jürgen