BenzWorld Senior Member
Date registered: Mar 2014
Vehicle: 1968 280se, 1972 280se 4.5, Land Rover disco II, Triumph Thruxton, Triumph Tiger. +boring Chevy Van
Location: Grass Valley california
Mentioned: 0 Post(s)
Quoted: 51 Post(s)
Another starting issue on my 4.5
A few weeks ago I fitted the pertronix ignition module 1885. It fired up lovely and ran nicely for about a week. I went to start the other day and it just cranked over. It did fire at first, but ran very lumpy and very low power. I could barley move it. Now it just cranks, and every second or two try's to fire.
What I have checked so far.
!. I checked with stroboscope all plug leads were getting power... Pass.
2. Removed all plugs (noticed they were all wet and smelled of gas) cleaned and refitted after checking I did have spark to the plugs.... pass
3. I also removed the return line at the tank and cranked it over and got a good flow back....pass.
4. changed out an inline fuel filter I fitted after tank, but before pump....pass
5. Removed cold start valve and tested that it was activating with a 12 volt power supply....pass
Any other suggestions would be great.
I did notice that the two wires going into the cold start valve were worn through in a couple of places and appeared quite brittle. (Possibly these have touched and caused a short?) If so, is there a fuse? Would this completely stop the car from starting?
Also should I check the points that control the injectors in the distributor? I did not go that route yet because I do seem to be getting fuel at the injectors indicated by wet plugs.
I am sure I have fuel delivery and a good fat spark.
What am I missing?