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 Stop-ping ping-ping.
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torqueymonster
Cochise

USA
516 Posts

Posted - 28 Jul 2010 :  10:40:11 AM  Show Profile  Reply with Quote
So. Trans Am has a high torque starter now, so it starts, the ground issue I had is fixed, so it starts consistently. I now have two niggling issues. first is pinging under med/heavy acceleration (I looked at the other timing entries, but I'm just wondering how far the distributor typically needs to get moved to eliminate this. I don't want to go overboard,as it runs pretty darn well now). I'm running super in it, but at 9.5 or so c/r, is that enough? Secondly, from a standing start, if I floor it, the car goes like hell up to about 70-75, has a slight hesitation, then resumes accelerating. Seems to shift and run perfectly up to that point...Any thoughts?

462 in a 77 ta, th-350, electric fuel pump, xtreme energy 268 cam.

Thanks, gents!!

TM

Christ
Howling Wind

USA
1805 Posts

Posted - 28 Jul 2010 :  6:56:10 PM  Show Profile  Visit Christ's Homepage  Reply with Quote
What size carb? What is your timing set at and what is it final advance? At 9.5 you shouldn't be pinging!
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bnorris_74
Crazy Horse

USA
1410 Posts

Posted - 28 Jul 2010 :  9:02:32 PM  Show Profile  Reply with Quote
10 to 12 initial and no more than 34 total.

How much to turn your dizzy is based on the above numbers. If you hear pinging, get that under control. Your rod bearings will thank you.

If you are running vacuum advance, check to see how timing it's adding. I limited mine to 10 degrees.

Edited by - bnorris_74 on 29 Jul 2010 06:59:44 AM
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Phil
The Great White Buffalo

USA
6390 Posts

Posted - 30 Jul 2010 :  07:15:48 AM  Show Profile  Reply with Quote
What speed is the trans shifting to 3rd at WOT?

"Chevy": even the name sounds cheap.
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torqueymonster
Cochise

USA
516 Posts

Posted - 30 Jul 2010 :  3:05:46 PM  Show Profile  Reply with Quote
Christ... 850, I believe. Don't know.

Phil. @ WOT, about 55-60.
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torqueymonster
Cochise

USA
516 Posts

Posted - 30 Jul 2010 :  3:07:02 PM  Show Profile  Reply with Quote
Also, It's apparrently eating oil. down 3.5 qts?? not smoking...?
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bnorris_74
Crazy Horse

USA
1410 Posts

Posted - 30 Jul 2010 :  4:02:50 PM  Show Profile  Reply with Quote
If you are losing oil down the valve guides, that will lower your octane level and cause pinging.

EDIT:
If you are adding oil to the combustion chambers in any manner, it will lower the octane level and cause pinging.

Edited by - bnorris_74 on 30 Jul 2010 4:04:06 PM
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torqueymonster
Cochise

USA
516 Posts

Posted - 30 Jul 2010 :  4:14:51 PM  Show Profile  Reply with Quote
um, How does THAT happen???
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Phil
The Great White Buffalo

USA
6390 Posts

Posted - 30 Jul 2010 :  6:30:43 PM  Show Profile  Reply with Quote
Re: the 70-75 mph stumble, have you been able to monitor your fuel pressure?

"Chevy": even the name sounds cheap.
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torqueymonster
Cochise

USA
516 Posts

Posted - 01 Aug 2010 :  6:48:38 PM  Show Profile  Reply with Quote
Phil-- running 6 lbs-- red Holley pump pushing @ the tank.

Very concerned about the oil issue. This engine was professionally re-built a couple of years ago, but with all the crap I've been getting fixed here and there, haven't been driving it (or checking the oil) enough, clearly... Any idea what the average guy needs to do to find out if that's what's up??
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bnorris_74
Crazy Horse

USA
1410 Posts

Posted - 01 Aug 2010 :  6:55:03 PM  Show Profile  Reply with Quote
Oil leaking into the combustion chambers should show up on the spark plugs.

If it is leaking to the outside of the engine that would be obvious.

Edited by - bnorris_74 on 01 Aug 2010 6:55:27 PM
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torqueymonster
Cochise

USA
516 Posts

Posted - 03 May 2011 :  10:48:14 AM  Show Profile  Reply with Quote
UPDATE: Tackling timing next weekend, but the stumble was the lack of squirt via accellerator pump. Tweaked that-- no off-idle stumble anymore... hee, hee! And I forgot I've gor a bigger than stock oilpan on the beast, too. last oil change, the morons @ the shop must have just put in the normal amt and not really checked it after... d-bags...
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Phil
The Great White Buffalo

USA
6390 Posts

Posted - 03 May 2011 :  2:45:46 PM  Show Profile  Reply with Quote
Oh no, don't say Jiffy Lube?!!

"Chevy": even the name sounds cheap.
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cortcomp
Coyote

USA
4340 Posts

Posted - 03 May 2011 :  4:57:34 PM  Show Profile  Visit cortcomp's Homepage  Reply with Quote
Oh god, having anyone who's starting changing oil in the last 20 years look at one of our cars is a disaster. I know it's been debated, but i like to fill the filter, at least halfway, first. One kid just stared at me when i asked if they did that. He had no comprehension why you would. Regardless of how you feel on the subject, anyone around cars has heard it brought up at least one time or another. It's like the parts guy who asks which pontiac motor you have when looking up filters or belts or gaskets. You can just tell they haven't been around older cars. Don't get me started on looking for parts for the Packard.
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Christ
Howling Wind

USA
1805 Posts

Posted - 03 May 2011 :  9:47:56 PM  Show Profile  Visit Christ's Homepage  Reply with Quote
Do a compression check let see if it leaking down!
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cortcomp
Coyote

USA
4340 Posts

Posted - 03 May 2011 :  10:52:02 PM  Show Profile  Visit cortcomp's Homepage  Reply with Quote
Also, as bill pointed out on my thread, a distributor with sticky weights or other issues could cause this.
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torqueymonster
Cochise

USA
516 Posts

Posted - 05 May 2011 :  09:25:25 AM  Show Profile  Reply with Quote
Prompto... Never again!!
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