bad pinging

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  #1  
Old 04-14-02, 03:08 PM
76nova
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bad pinging

did tune- up on sisters'76 nova. 250 cube electronic ign.

everything ok ,but pings bad up hills,no power. just low octane?

timing at 12btdc-fact specs... thanx guys.....
 
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  #2  
Old 04-14-02, 04:08 PM
Joe_F
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Carbon buildup in the EGR, timing woes or poor quality fuel will cause it.

Try a higher quality fuel first. If that doesn't solve it, make sure you are setting the timing per mfgr's specs. Then check the EGR valve.
 
  #3  
Old 04-14-02, 04:12 PM
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Join Date: Jan 2001
Posts: 93
Lightbulb

When you adjusted the timing is the advance vacuum tube unhooked? It maybe you misadjusted the timing. The other technicians maybe able to help you, especially Joe Cool he is a GM guru. Good luck on the repairs. Keep me posted.

OM
 
  #4  
Old 04-14-02, 04:18 PM
76nova
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thanx

thanx joe. i put high test in,jug of stp fuel treatment,dry gas.

checking egr sounds rite,cause it also hesitates. any idea where it is? clean it first rite???? i should get manual,huh?
you guys are great, thanx...........................bob



12btdc is manuf. specs.
 
  #5  
Old 04-14-02, 08:47 PM
Joe_F
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On the manifold usually...check your underhood emision diagram for some guidance. Should also have the timing PROCEDURE. You must follow it to the T as OM said.

Yes a manual is a good idea..
 
  #6  
Old 04-14-02, 09:17 PM
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It sounds like your timing is too far advanced. I believe you disconnect the vacuum line to the vacuum advance, plug it, then set timing. Check a manual to be sure. Go to www.autolibrary.org for timing procedure.
 
  #7  
Old 04-15-02, 05:47 AM
Joe_F
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Thumbs up

Or just look at the sticker under the hood . It's there too .
 
  #8  
Old 04-16-02, 05:41 PM
76nova
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re;pinging

thanx guys!!!! yes i did the procedure correctly, the label on
the car says 12 btdc,the autolibrary ref[thanx] states 6btdc.
i guess i'll try 6. thanx again,guess ill get it sooner or later!


still learning,bob
 
  #9  
Old 04-17-02, 05:53 AM
Joe_F
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Thumbs up

Let us know what you find......
 
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