LT1 Based Engine Tech 1993-1997 LT1/LT4 Engine Related

cranks, sparks but wont start

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Old Apr 9, 2005 | 10:00 PM
  #1  
Jeffs94Z28's Avatar
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cranks, sparks but wont start

I put in a new opti, thought it was all lined up right. It cranks, sparks but wont start. So I try to take out the old dowel of the engine and put in the new one that came with the new opti and it wont come out as if it was jammed in First any ideas how to get this out and second what could it be if it sparks and cranks? Thanks in advance.
Old Apr 9, 2005 | 10:05 PM
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Re: cranks, sparks but wont start

Why are you trying to take the dowel pin out of the cam? That should have nothing to do with it.
Old Apr 9, 2005 | 10:07 PM
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Re: cranks, sparks but wont start

I thought it may make a difference, seeing where it wouldn't start. what could it be? I had it lined up right. thanks
Old Apr 9, 2005 | 10:10 PM
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Re: cranks, sparks but wont start

Why did you change the opti? also did you check spark at the plugs?
Old Apr 9, 2005 | 10:11 PM
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Re: cranks, sparks but wont start

yes i checked that tonight, it sparks fine.
Old Apr 9, 2005 | 10:12 PM
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Re: cranks, sparks but wont start

and i changed the opti because it was throwing a code, a mechanic got it wet and then it would just die out after a few minutes.
Old Apr 9, 2005 | 10:17 PM
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Re: cranks, sparks but wont start

What was the code? Since your car is a obd1 computer. It really dosent have codes for the opti misfiring. Is that how he thought it was the opti? Check your firing order and fuses. Make sure your getting gas also. Also make sure the wire to the opti plug is in good shape. Where did you get the new Opti from?

Last edited by rathmotorsports; Apr 9, 2005 at 10:55 PM.
Old Apr 9, 2005 | 10:19 PM
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Re: cranks, sparks but wont start

dal on the board
Old Apr 9, 2005 | 10:21 PM
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Re: cranks, sparks but wont start

i forget which code it was it was so long ago, since i started this project, he was checking for an oil leak so he sprayed down the engine.
Old Apr 9, 2005 | 10:45 PM
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Re: cranks, sparks but wont start

it was code 36 high-res failure.
Old Apr 9, 2005 | 10:58 PM
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Re: cranks, sparks but wont start

For that code...that can be your opti,but it should still run as it will use the low res to run. Check your grounds. Besides that it should work if you checked everything else and its fine. Where did you get the opti from? You can have a bad optical sensor on the opti. It can still give spark , but not a great spark or enough. What color is the spark?
Old Apr 9, 2005 | 11:21 PM
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Re: cranks, sparks but wont start

it was bright blue.
Old Apr 10, 2005 | 05:59 AM
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Re: cranks, sparks but wont start

Try squirting fuel in the intake. If it still doesn't start, you have the opti installed wrong.
Old Apr 10, 2005 | 10:30 AM
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Re: cranks, sparks but wont start

could i just get a fuel pressure gauge?
Old Apr 10, 2005 | 11:03 AM
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Re: cranks, sparks but wont start

I wouldn't start looking at fuel problems. Just to make sure press the s-valve at the back of the intake manifold there is a little cap on it just take it off and press in the release fuel should squirt out. Do that with the car off, if it shoots out a little you know you've got some pressure. Thats not very accurate way to go about it, but I seriously doubt its a fuel problem if you changed the opti and now it won't start.

I would check the plugs to see if they are in the right firing order, replace the coil, coil plug it leads to the opti(thats like 17 dollars total at autozone), and make sure you aligned the cam shaft pin correctly into the opti.

On the opti there are 3 areas where it looks like the peg can fit, just stick it into the most irregular shaped slot and press in the opti.

- Z28WannaB
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