73 MFI drive then stall while driving.

[pszemia]

Hi everybody, as many on the forum know, my car is being serviced and tuned up by me, since last mechanic years ago touched what he shouldn't have.

Now, i am on the final stretcht of my tune up, walking through a complete CMA for 2nd time since engine overhaul (500km ago/ 5 years), and something wired happened.

I had to change both tank to body fuel lines because they were broke and loosing fuel, hoses changed, and everything ready for a test ride.

Changed the rotor for a brand new 6500RPM rev limited, and then started the car, took some cranking time, but she will fire.

Went for some fast turns around the block and everything was going well meanwhile the car was waning up propertly. Stopped for a refueling, drove for 5 blocks, stoped at a light, started to move, 20mts and the car died. Tried to start again, and nothing happens it will not start.

Opened the hood, checked all the cables, nothing went loose, i always carry a spare rotor just in case, so i removed the newly installed rev limited 6500RPM rotor and installed the old classic regular bosch rotor. Tried to start, and she started right away.

It's proper to mention i have an original Bosch CDI working and whistling, but removed the points and installed a pertronix replacement long time ago. All the spark plugs are brand new. The coil is an MSD high vibrance coil epoxy filled, and also brand new. The ignition cables are new enough (2 years old and only 100km on them).

Any ideas where the problem can be coming from?

I have a spare fuel filter, just in case. But based in my experience, the problem is coming from something electrical, and not mechanical, what do you think??

Thanks a lot!

Ariel

[RSTarga]

1) you need to drive it more!
2) how old id the fuel?
3) check the fuel strainer at the bottom of the tank as your symptoms sound like dirt getting on strainer. after sitting you get some fuel flow.
A few runs around the block were probably not enough to overheat the coil, which also exhibits similar symptoms.
Seriously, you rebuilt the engine 5 years ago and have only put 500Kms on it? you haven't even bedded in the rings!
Saludos!

[eimkeith]

I agree; check the strainer/sock at the fuel pickup in the tank..


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[mobius911]

If the electrical system is not working 100% it can give you fits. I've had CDI boxes that worked fine until the car got to full operating temperature, then they started malfunctioning. I've heard the same can happen with the Pertronix.

You may be at a point where you need to swap in known good components on the ignition system to see if something there is causing the problem: CDI, plug wires (seems they are good so that's only a last resort), cap/rotor, Pertronix, coil.