z28camaro1996

iTrader: (1)

heres whats happening. theres no codes. its a 96 z28. before it stopped running it back fired out the tailpipe. and would only idle and rev up slow. but i would goose it and it would bog down and nearly die until i let off causing it to back fire like a stick of dynomite. i had spilt coolant on the opti from trying to perform the tb bypass and broke the plastic vacuum line. i repaired the line before starting. and i drove it a mile down the road after a mild burnout,then all hell started.i have replaced the icm and the opti. nothing has changed.

i tried to start it, all it would do is turn over and over. but when i let off the starter, its started to deisel a bit. it seemed like it would fire on one cylinder and spin a couple of times then fire on another. could a vacuum leak cause this or did my car jump time when i did the burnout.

djjab57

iTrader: (17)

Looking at your sig i guessing you dont have cats ? if you do could be clogged up real bad or the coolant got in the opti

z28camaro1996

iTrader: (1)

the opiti i took off was dry but i replaced it anyways. i syliconed the opti cap and it works great. and no cats

z28camaro1996

iTrader: (1)

i do have it hypertech programmed.

ss.slp.ls1

iTrader: (36)

I was going to say that your symptoms are tell-tale signs of an opti problem, but it looks like you figured that out already.

z28camaro1996

iTrader: (1)

i meant to say that even after replacing the opti its still not running

djjab57

iTrader: (17)

did you replace the coil ?

ss.slp.ls1

iTrader: (36)

Did you open up the opti to check out inside? Your issues sound like a detached rotor.

EDIT: I reread what you typed...so you had the not running issue, so you replaced the opti and it's still not running?

z28camaro1996

iTrader: (1)

still not nunning and the old opti was just fine.

z28camaro1996

iTrader: (1)

i replaced the coil a couple of years back.

z28camaro1996

iTrader: (1)

i was checking out some of the vacuum lines and found that two of them are cracked really bad.

z28camaro1996

iTrader: (1)

i circled the hoses that were in horrible shape would this cause it not to run and back fire?

ss.slp.ls1

iTrader: (36)

Those are your EVAP hoses. Replace them, but that won't prevent your car from starting.

Get a hold of a fuel pressure gauge and check your fuel pressure. If it's not the opti, the only thing I can think of is that your pump took a crap.
Also a new coil is cheap, won't hurt to try a new one.

z28camaro1996

iTrader: (1)

i checked my fuel pressure and it was at 43 at idle. i have my old coil that i took off and nothing was wrong with it i may try it tonight.

Luke1834

Did you check your plugs and wires ?

z28camaro1996

iTrader: (1)

no. i had them on there for about 60000 miles and they're the ac delco platinums.

Luke1834

I would check your wires and plugs try starting it in the dark and see if you see any sparking under the hood, If you see arching in the wires then that is your problem

z28camaro1996

iTrader: (1)

does the car come stock with timing chain or gear drives?

ss.slp.ls1

iTrader: (36)

Timing chain.

z28camaro1996

iTrader: (1)

i bet my timing jumped time then.