I have a 94 civic del sol (d15b7) that starts strong cold and when hot (if started immediately once turned off). But if you wait 10 minutes it cranks and cranks but won't start. It will eventually start once you crank it enough times.

Items of note:
New plugs - no oil in old ones and they looked good
Spark checked and all fine
Injectors ohms in spec (all 12)
Engine compression tested and all 150-170
Fuel regulator pressure checked - 32 with vacuum line connected and 42 disconnected (before new fuel filter)
Fuel pressure with engine off at 32+
Timing checked and in spec
New fuel filter
New distributor/cap/rotor
No oil in coolant, vice versa
Vacuum lines checked when running with carb cleaner and no changes in idle
Map sensor disconnected and engine cut off
IACV disconnected and idle wandered
Ect replaced
Coolant sensor checked and rewired
Oil dipstick removed when running with no whistle
Tried starting with ecu jumped with same hick ups
Main relay soldered

Any other ideas?

 

No CEL? Try a different ECU.

 

No CEL.

 

Is there anything in the ECU I can check myself? Or does anybody have an ECU I can try in northern california? Sonoma County area... I'll provide the beer.

 

Don't worry about your ECU. That makes no sense.

Did you test your spark when the car wouldn't start? When the car doesn't start, does it crank? When the car doesn't start, if you turn the key to ON(II), does the CEL come on for ~2 seconds, then turn off? This is a common symptom of coil/ICM failure. It's also a common symptom of main relay failure.

 

When it doesn't start it does crank. The CEL also comes on for a few seconds then turns off when in the ON (II) when it won't start. Has a new distributor and all contact points on main relay resoldered. Going to check spark now when won't start. Also just cleaned IACV.

 

Has spark when having trouble starting.

 

Turned out this was a leaking Head Gasket. Replaced that, cleaned the head and viola - happy car. Now it's time for a new paint job