Ok, this has happened 3 or 4 times to me so far.

Car will stop starting, with all fuses looking good and the coil packs tested ok (.6 ohms trailing/.3-.4 ohms leading).

So, I go and check for spark by taking out L1 spark plug wire from the spark plug in the engine, and use the cheapest spare spark plug I could find in the plug wire while someone cranks the engine. All of a sudden it sparks, shocks the **** out me and starts up.

Problems I think might relate from readings other "No Spark" threads: sometimes after having trouble starting, then finally starting on its own, the tach will cut out until the next time I start the car up; hesitation, usually after car is hot or when volts get below 13.2 volts.

Since then, I have gotten a new battery and have run the car on a wideband and gotten 12.2-12.4 afrs on stock ecu at 10.5 psi and at night. Makes me think fuel is getting where it needs to go. Although I have never tested afrs while the car is having the hesitation problem. Also, car is flooding more often since the engine has been broken father in, about 10k miles. Walbro and (4) 620cc injectors with no piggybacks might be the cause. Timing is advanced to 15 degrees. Fuel cutoff switch went bad so I bypassed it, removed it and connected the wires directly to each other instead of adding another cutoff switch.

ANY ideas? I kow I threw out a lot of info.
-J

 

is the car just not cranking over. have you checked the starter? and have you checked the tach wire on the back of the cluster? it could just hot start though. imo with the 620 and no fuel controller. turbo non turbo.