Hi, I have 2 ZR-1's, both 1990. I was in hospital for several months, etc, and anyways both cars sat for 3-4 years.
Got the black car started briefly, it ran barely for a few minutes, seemed to come around better, then quit. Fuel tank was dry. Assumed faulty fuel pump so changed them out. Car has never fired since.
Pulled 8 plugs out, they all have spark, even though it seems a bit on weaker side. Put fuel pressure gauge on rail,it seems fine, about 50-55 lbs while cranking engine. Still won't start, will not even fire.
Also, have bypassed vats system using a GM dealer vats interrogator black box. Still won't fire.
Any suggestions ?
Also on my red car, it always cranks over, bypassed vats system, it will sometimes fire up. Took it for drive of 10 miles, it had maybe 100 hp or less. My mechanic then cut out catalytic converters, now it starts only when battery connects directly to the purple wire. The car now will not seem to rev up, and backfires a bit. Shut it off, then it will refuse to start until several attempts made.
Both cars were sitting 3-4 years. I even tried swapping ecm's, did not make any difference.
Any suggestions ?
Thanks
Rd.adam@hotmail.com
Dean Adam