Question about 1991 Chevrolet C1500

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1990 full blazer ignition timing degrees

I just put a new motor in my 90 blazer. 350 ci 330 horse. I do not have the ever so important label under the hood. I was told to set it to 0 degrees with the advance unplugged. When I plug it back in (with the key off) the timing reads about 15 degrees btdc. When i drive it it is sluggish. this cant be right. Can some one help me please.

Thanks Jason Brown
Ocala Florida

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  • paul erickson
    paul erickson May 11, 2010

    the stock blazer didnt make 330 hp
    so what was done to the engine?
    this will make a big difference where your timing is to be set.


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If the ECM is still in and working, "0" deg unplugged would be correct. But are the timing marks correct? If the marks are lined up statically on "0" deg. is the #1 piston at TDC? Also important is for the ECM to be happy with the feedback it gets from it's sensors so it is running "in loop" If the "check engine" light is on, it will run but poorly. Make sure all sensors are in place and connected properly.

Posted on Dec 17, 2008

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