We have a 96 z28 that wont start. Car was bought with mods and issues, mods list is long tubes kand n true duels big cam and a stall supposedly 355 unsure of what the cam specs are. Parts that have been replaced relucter wheel, crank sensor, opti, timing chain(timing chain had some slack in it) car did run hard starting would randomly die, would backfire through the exhaust and intake, had fuel fuel in the oil changed the oil and injectors and fuel pressure regulator. After all that it still wont start! Car has spark, injector pulse and fuel pressure. Did check compression in a cylinder had 170 pounds, going to check the rest of the compression tomorrow. Any thoughts or suggestions would be greatly appreciated

 

did you ever get it to actually start since ive been up there or is it still a no start? I kind of wonder if your new opti isnt on right. The fact that you have gas in the oil is probably from a bad tune or bad piston rings.
isn't 170 a little low?

 

I'll just add to a Nebraska thread by saying whats up!

Oh and are you sure the opti was put on correctly? And what fuel pressure are you seeing?

 

the opti is on right I had it running for a lil bit fuel pressure is about 60 pounds but it does seem to bleed out fairly fast

 

60 psi is WAY to high... more like upper 30's- mid 40's psi
if the pressure is bleeding out really fast then your regulator is shot.

 

it's got a adjustable fuel pressure regulator on it I'll just turn it down a little bit then

 

the fuel pressure regulator was on a nother project car and iran ride at 60 pounds

 

yea that 60psi is way up there. If i was you i'd just get a stock one and put on there so its right all the way around...

 

it had a stock one on it I just put the adjustable one on it

 

*copy/paste from cz28.com-Injuneer
Stock fuel pressure without the vacuum line should be 43.5psi. Factory specs are 41-47psi.

 

ok thank

 

any updates? hopefully you found the problem

 

Nope still wont start i did take it to a shop and they dont know whats wrong with it now its back home idk ehat to do now

 

Pull a couple plugs and check their condition. See if they're soaked in gas. If you want pm your number to make things faster.

 

how is the repair shop just gonna tell you they dont know whats wrong? thats crazy, i wish i could help but im only 16 and im new to the trade hopefully ill be an expert by 23. my Formula is how I'm learning, and i get a lot of learning fixing all these small problems! haha