Not starting (again!!)

[geordieggg]

After getting advice from you guys (and girls) last time, I got my Zed running again. It's a 260Z 2+2, with an L28 that has L20 EFI.

Since then, I had to replace the thermostat, which shouldn't have been an issue. Car didn't want to start, so pulled all the temp sensors out and cleaned all the contacts (even pulled all the bolts out of the housing and cleaned them, to make sure of a good contact on the block).

After cleaning everything, the car started up straight away, so I letit run for 5 minutes or so and turned it off.

That was 3 weeks ago, and the damn thing hasn't started since. It cranks over fine, it's got heaps of spark. Initially it'll crank for as long as normal with a cold start and give one quick cough and splutter, like it wants to start. This might happen two or three times, then after that it won't start.

Remove the plugs and they are dripping with fuel. I'm positive the fuel pressure's ok (haven't had a gauge on it to double check), I've cleaned the lines from the tank to the fuel rail, drained the tank. Tank itself is very clean (no sediment).

I've been through the EFI book from this site, checked everything through the harness, and everything checks out fine.

Anyone got any suggestions??

[zeiss150]

How's your timing? Also How's your compression? If you have low compression no matter how much fuel and spark you have it wont run. Are you using the L20 FI computer? It might be delivering the fuel at the wrong time if your fuel is injected on the exaust stroke ... well, no vrooooooom. If you are sure you have spark on the compression stroke then I would look to timing and I would take a close look at that computer and make sure it is fireing on the compression stroke. Don't forget to check your compression on all 6 cylinders it should be somewhere in the 150 - 175 psi range ... If its below 100 you have a major problem.

Just some ideas, good luck

:burnout:

[geordieggg]

Thanks for the reply..........

Timing hasn't been changed since I got the car, and neither has any of the FI stuff. Drove the car about 1000k's to get it home with no problems, so the ECU was running fine. Car ran slightly rich the whole way, but considering the way I drive, it's safer being slightly rich at low revs than too lean at high revs........

Compression is good, min 178psi up to about 188psi, that's in all cylinders with a stone cold motor. I've had the damn thing running, and between the last time it was running and when it stopped, the only things I have done were charge the battery, and bolt the fuel pump and ECU back into their spots. Since I did those three things, it has been having the problems described previously, so I suspect it's an electrical problem..........

[gator]

My 77 had a faulty FI system. It would just stop while running without warning. I spent some time on it but decided that it would likely be cheaper to take out the crappy FI system and instal a nice set of SU's. You with get a more reliable car with more power. It was pretty easy actualy.

I still dont know what the problem was but I suspect it was a faulty computer. The problem with these old electrics is there is now way to track an intermiten fault easily. There is about 6 different areas that could be causing your problem. My advise is before you get too far into spending money on it, think about the SU's.

Cheers ..Bruce