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88 Chevy Blazer timing problem
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John Dep
New User
Sep 1, 2011, 8:35 PM
Post #1 of 6
(2797 views)
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88 Chevy Blazer timing problem
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I have an 88 K5 Chevy Blazer 5.7L that wont hold timing at 0 deg. I can set the timing, shut it down, tighten the distributor start the engine, check the timing. The timing will advance to 4 deg BTDC. I have tried it several times, and each time it does the same thing. I have replaced ignition modual, ESC modual, & O2 sensor. Could it be the distributor, or the throttle positioning sensor? Sure could use some help.
(This post was edited by John Dep on Sep 1, 2011, 8:46 PM)
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Hammer Time
Ultimate Carjunky
/ Moderator
Sep 2, 2011, 3:16 AM
Post #2 of 6
(2766 views)
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Re: 88 Chevy Blazer timing problem
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How many miles on this engine? It could easily be a bad timing chain assuming you have checked the timing correctly.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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re-tired
Veteran
/ Moderator
Sep 2, 2011, 12:55 PM
Post #3 of 6
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Re: 88 Chevy Blazer timing problem
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Are you unplugging the EST wire before checking timing? Its a single brown wire above valve cover . When you unplug it you can then set the base timing. When its plugged back in the computer automatically sets the timing at 4 degree's.
LIFE'S SHORT GO FISH
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John Dep
New User
Sep 3, 2011, 9:32 AM
Post #4 of 6
(2741 views)
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Re: 88 Chevy Blazer timing problem
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The truck has 125,000 miles. The timing chain is good. I already checked that.
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John Dep
New User
Sep 3, 2011, 9:34 AM
Post #5 of 6
(2738 views)
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Re: 88 Chevy Blazer timing problem
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Yes. I did unplug the single wire for timing.
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re-tired
Veteran
/ Moderator
Sep 3, 2011, 9:45 AM
Post #6 of 6
(2736 views)
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Re: 88 Chevy Blazer timing problem
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Does the timing advance 4 deg if you do not reconnect the brown wire?
LIFE'S SHORT GO FISH
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