meangrn94ta

I have fuel fire and the motor will not start any one have any ideas

ss.slp.ls1

iTrader: (36)

So you have spark and you have fuel pressure, is that what you were trying to say? How did you verify spark and how did you verify fuel exactly? Did you verify spark at the cylinder? Did you verify that the fuel injectors are actually spraying?
Is the car poping and backfiring, or just turning over?

Another thing to note is that just because you get spark to a cylinder, doesn't mean it's getting good spark, for instance, a detached, damaged rotor will give intermittent spark to the cylinders, but it will crank all day and pop and backfire, but never actually run. Just saying.

meangrn94ta

I have 40lbs of pressure on the gauge and used a spark tester between the coil and opti and between the opti and the plug. I just put a new opti on it. The spark between the coil and opti is orangish and the same at the plug. Have checked injectors. If I use starter fluid it starts to hit.

ss.slp.ls1

iTrader: (36)

Start to hit? Does it start at all with starter fluid?

nomoneyz

iTrader: (15)

Opti may be off. First time I did mine it was off just a little bit and would crank till the battery was dead. If I gave it some gas it would almost start then backfire. Might check into it.

lncboytre_d

check the ICM. Mine had similar problems and I took it to advanced auto..... they checked it and it failed the "low rpm test". I replaced it and bam.....fixed the problem. Hope yours is that simple

97formula17

Did anybody fix this problem? im having a similar issue im getting great fuel pressure and all injectors are spraying...i pulled a spark plug out to check the fire and all i get is an orange ark. brand new plugs and wires. when the motor is all together and i try to start it its pops and back fires and starting fluid makes no difference.

ss.slp.ls1

iTrader: (36)

Sounds like an ignition problem. I'd check the coil, ICM, and opti.

97formula17

Icm checked good and I replaced the coil just now and its doing the same thing.how do I check the opti?

quik95lt1

iTrader: (7)

did you install the opti in the same spot as before??? you can install it in the wrong little section of the cloverleaf on the back of the opti and your timing will be way outta wack......i knew a noob a long time ago that did that...cough cough lol

97formula17

I don't think so but anything is possible this is my first lt1 so all this opti spark stuff is pretty new to me. What would be a dead give away that my timing is out for the opti?

ss.slp.ls1

iTrader: (36)

Your no-start condition. If you are sure your coil, ICM, plugs, & wires are all good, then I can only suspect the opti. Just make sure you get a new AC Delco or Delphi opti (no cheap knock offs) and be sure to thread lock the rotor screws.

97formula17

So if the opti is bad it will still give off a weak spark? Is there any way to test it so I can be 100% sure?

quik95lt1

iTrader: (7)

if the opti is installed wrong it will still give a full spark just at the compeletly wrong time.........you have popping and all sorts of crap going on......

97formula17

Well mine is giving an Orange spark through the plug could that be it still out of time? When I take it off how will I know its out and how do I put it back in time?

ss.slp.ls1

iTrader: (36)

http://shbox.com/1/opti_back.jpg

When you remove the opti, pay attention to where the cam dowel pin is in regard to the optispark drive mechanism. Refer to figure above.

You can also remove the cap from the opti (E4 socket needed) and see if the rotor is still securely fastened.

Other than that, the only way to test the optical side of the distributor is to use an oscilliscope and observe the square wave (I have never done that).

97formula17

Alright I removed my opti but its in time and my engine is in time have any other ideas?

ss.slp.ls1

iTrader: (36)

Did you pull the cap off to inspect it yet?

97formula17

It's the opti. I borrowed a friends and slapped it on and as soon as I hit the key it fired right up. I appreciate everybody's help. wasnt for yall id still be lost lol