After upgrading rocker arms she cranks but won't start... Any ideas? - Fourth Generation Pontiac Firebird (1993 - 2002) - Firebird Nation

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After upgrading rocker arms she cranks but won't start... Any ideas?


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#1 U4iclight

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Posted 10 June 2020 - 09:39 PM

I just replaced the replaced the intake manifold gasket and upgraded the rocker arms to 1.6s in my 1993 LT1 firebird, hooked everything up but now she cranks but won't start.  It has spark from the ignition coil, and there is gas coming up to the fuel rails and she throws out a hiccup now and then so there is some compression going on in there.  Other then that there are 2 lights on the dash that come on, "Check Gauges" and "Service Engine Soon".
 
The only thing I can think of is the computer isn't going to work with the change... I'm hoping not  seeing as I don't know where I could take the prom to be tuned.
 


#2 JoePeek

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Posted 10 June 2020 - 11:17 PM

How did you adjust the new rocker arms? 



#3 sea dog

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Posted 11 June 2020 - 03:32 AM

Did you perhaps over tighten the rocker arms? This would keep engine from running. I believe the shoebox site has rocker adjustment instructions.http://www.shbox.com

 

Instructions at # 9 in how to section.

 

And we have the 93 factory service manual at the following link. It will have instructions. http://www.mediafire.../?40mfgeoe4ctti

 

If all else fails, try the shade tree method of rocker adjustment. It involves loosening the rocker arm nuts just enough to get engine running. Then, one by one, you loosen rocker arm nut untill valve clatter occurs. Then tighten rocker arm nut until clatter on that rocker stops. Turn adjusting nut 1/4 turn more. Move on to next rocker arm.

 

This method is messy as oil will splatter do to running engine with valve covers off. It's a method of last resort if you can't adjust rockers with shoebox or service manual method.



#4 ZumpTA

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Posted 11 June 2020 - 01:35 PM

Please follow the procedure in the manual.  I decided to do it the shade-tree mechanic way to fix a few loud lifters.  I now have a flat spot in my RPM band from 4,500 to 5K that wasn't there before.  The procedure in the manual seems like a bit much, but, you don't want to be where I am.  Some day I'll go and do it right like I should have done the first time.


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#5 JOE68

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Posted 12 June 2020 - 03:59 PM

if you over adjusted or pushrods are the wrong length you may have bent the valve stems    do a compression test



#6 U4iclight

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Posted 4 days ago

Thanks for your input everyone. Valves collapsed: After a few months of not being able to work on her I took another look and found out that she wasn't getting enough oil and the valves collapsed.




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