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#1
02-12-2006, 09:41 AM
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Timing Problems
I have a 1990 Camaro Iroc-z with a 350TPI motor. Ever Since I tore the motor down and rebuilt it, i can't get the computer to quit taking over the timing and making it retard. Can anyone give me some ideas on what to look for or how to fix this. Thanks
Jess 
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#2
02-12-2006, 02:34 PM
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Re: Timing Problems
How big of a timing retard are we talking about here? Really big and in the system couldnt possibly be working right...or normal, slight retard.
I know this sounds like a dumb Q, but did change the timing chain and tensioner? Any trouble codes? Last edited by malletslinger; 02-12-2006 at 03:07 PM.
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#3
02-12-2006, 05:14 PM
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Re: Timing Problems
We did change the timing chain. The tensioner is the same. When we first fired up the motor it retarded the timing along with a couple of eingine codes. A new knock sensor seemed to fix all of that. Now when your driving it and you get on it you can feel the car get into it then back off so I'm assuming that it is the computer taking over the timing, not sure what else it could be.
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#4
02-12-2006, 05:22 PM
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Re: Timing Problems
Have you changed the air and fuel filters? Mabe it is being starved by one of the two.
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#5
02-12-2006, 05:25 PM
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Re: Timing Problems
and check to see if there i any new codes.
__________________
95 Z71 Silverado 4x4 ext. cab Mods- Flowmaster Exhaust,Intake
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#6
02-12-2006, 05:26 PM
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Re: Timing Problems
The fuel filter was replaced a couple of months ago as for the air filters they are probably a little dirty but not bad. If the motor was starved for air, would that cause it?
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#7
02-12-2006, 05:28 PM
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Re: Timing Problems
it could, just take the air filter out just to see if that is it, DO NOT RUN IT LIKE THIS. Just take it out and start it up and see if it is still doing it.
__________________
95 Z71 Silverado 4x4 ext. cab Mods- Flowmaster Exhaust,Intake
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#8
02-12-2006, 05:33 PM
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Re: Timing Problems
Have you checked to be shure the base timing is correct?
Any play in distributor shaft?
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#9
02-12-2006, 05:37 PM
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Re: Timing Problems
I haven't noticed any play in the distributor. I have jst replaced the cap and rotor though, thought that might have played a part in it. What do you mean by base timing?
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#10
02-12-2006, 05:39 PM
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Re: Timing Problems
When you adjust the timing(need timing light) that is the base timing, then the computer makes changes as necessary.
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#12
02-12-2006, 05:44 PM
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Re: Timing Problems
And you are shure the problem isnt something simple like air filter, vacuum leaks, spark plugs, or dirty injectors?
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#14
02-12-2006, 05:49 PM
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Re: Timing Problems
Vacuum hoses, plug wires, or any trouble codes?
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#15
02-12-2006, 05:55 PM
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Re: Timing Problems
No trouble codes. I did have a wire burn on my headers so i had to replace it with a lesser quality wire. Haven't had the money to pick up a new one yet. I have ACCEL 8.0 on there right now and the one i had to replace is just a cheapy. As for the vacuum hoses, i think everything is good there.
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