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

Post Head change questions

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Old Aug 22, 2007 | 08:45 PM
  #1  
immortalmack's Avatar
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From: detroit
Post Head change questions

Changed the heads hooked things up car wont start.

My concerns:

Do I have to do anything special with the fuel system when I'm done?

Valve lash is not the best but all bolts are firm. After turning over a few times some are losse again.

How does the wiring go on the Igntion Control module and if hoops are not in right order will car start.
Old Aug 22, 2007 | 09:19 PM
  #2  
seawolf06's Avatar
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From: Raleigh, NC
How did you set the lash? Check this site in case: www.shbox.com in the How To section. Does it pop or anything at all?

Push down on your schrader valve and then turn the key on the make sure you're getting fuel. You can check the spark by brushing a spark plug wire against your header while cranking to see if it sparks. (don't do this with spilled fuel around )
Old Aug 22, 2007 | 09:27 PM
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raroz28's Avatar
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Posts: 1,326
From: Metro Detroit, MI
No you don't have to do anything to the fuel system. The car might run a little rough for the first few minutes while the ECU adjusts (because I'm assuming you pulled the battery).

Your rockers aren't adjusted correctly. You need to adjust them before you start it. If they're too loose the valves won't open enough and things are just going to be bad.

This is the best guide for valve adjustment.

http://www.centuryperformance.com/valveadjustment.asp

It's critical that you adjust them correctly before running it. Too loose and valves won't open enough, and too tight, the valves won't close enough. Once they're adjusted, you may have to give the car throttle to keep it running for a minute while the computer adjusts.
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