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spark plugs & timing [message #150153]

Sat, 19 November 2011 18:19

jayrabe

Messages: 509
Registered: June 2009
Location: Portland, OR

Karma:

Senior Member

455 in my 76 PB has been running a bit rough, so decided to check/replace the spark plugs. Last time was 3000mi ago, but I didn't check or adjust the timing at that time, being clueless about how to do that. Also, I gapped the plugs to .040 that time, but this time I read the manual more completely, and see that when you have an HEI distributor (which a year ago frankly I didn't know I had - did I mention I'm not a mechanic?), plugs should be at .080.

Also have Howell TBI.

Bought a timing light and before replacing plugs, at idle it was about +16 BTDC (w/ vac disconnected). Way too far advanced per manual that specs +8 at 1100rpm. Also, when I pulled the plugs, they were all black and unhealthy looking. So first question is, could the poor condition of the plugs be due to the timing so far off and/or the gap being 1/2 what it should be?

Second question: Napa didn't have the R46SZ so gave me RapidFire #7. Will they work for me? assuming I gap them to .080?

Any other advice to help this non-mechanic will be Greatly appreciated.

Thanks.

Jay Rabe
76 PB
Portland, OR

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[Message index]

		spark plugs & timing By: jayrabe on Sat, 19 November 2011 18:19
		Re: [GMCnet] spark plugs & timing By: emerystora on Sat, 19 November 2011 18:32
		Re: [GMCnet] spark plugs & timing By: powerjon on Sat, 19 November 2011 18:38
		Re: spark plugs & timing By: Matt Colie on Sat, 19 November 2011 18:43
		Re: [GMCnet] spark plugs & timing By: jimk on Sat, 19 November 2011 18:52
		Re: [GMCnet] spark plugs & timing By: jayrabe on Sat, 19 November 2011 19:28
		Re: [GMCnet] spark plugs & timing By: Ken Burton on Sat, 19 November 2011 19:39
		Re: spark plugs & timing By: JohnL455 on Sat, 19 November 2011 21:41
		Re: spark plugs & timing By: PETEinLongBeach on Wed, 23 November 2011 15:52
		Re: [GMCnet] spark plugs & timing By: Ken Henderson on Wed, 23 November 2011 16:50
		Re: [GMCnet] spark plugs & timing By: Ken Burton on Thu, 24 November 2011 11:14
		Re: [GMCnet] spark plugs & timing By: WD0AFQ on Fri, 25 November 2011 23:20
		Re: [GMCnet] spark plugs & timing By: Ken Burton on Sat, 26 November 2011 02:38
		Re: [GMCnet] spark plugs & timing By: mike miller on Sat, 26 November 2011 07:51
		Re: [GMCnet] spark plugs & timing By: roy1 on Thu, 24 November 2011 11:20
		Re: spark plugs & timing By: George Beckman on Fri, 25 November 2011 22:58
		Re: spark plugs & timing By: Larry on Sat, 26 November 2011 07:33
		Re: [GMCnet] spark plugs & timing By: jayrabe on Sat, 26 November 2011 10:28
		Re: spark plugs & timing By: Bob de Kruyff on Sun, 27 November 2011 10:18
		Re: spark plugs & timing By: midlf on Sun, 27 November 2011 01:29
		Re: [GMCnet] spark plugs & timing By: jayrabe on Sun, 27 November 2011 13:34
		Re: [GMCnet] spark plugs & timing By: Ken Burton on Sun, 27 November 2011 14:24

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