how do i stop pinging? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

crm318 · 05-19-2007, 07:44 PM

i have noticed a high pitched clanking under my hood latley when i accelorate. i think it might be pinging. what does it sound like? i have about 9.0 compression and i use 87 octane. what are some things that might cause pinging? what are some steps to cure it?

dave2953 · 05-19-2007, 07:51 PM

Sometimes it can be a timing issue, but can also be from low octane/bad gas. I have my timing dialed in, but if I run 87 my truck pings like crazy. It doesn't ping at all when I run 93. I'm sure there are other causes that I'm not aware of. Good luck getting the problem solved.

EAST SIDE LOW LIFE · 05-19-2007, 09:36 PM

Quote:

Originally Posted by dave2953

Sometimes it can be a timing issue, but can also be from low octane/bad gas. I have my timing dialed in, but if I run 87 my truck pings like crazy. It doesn't ping at all when I run 93. I'm sure there are other causes that I'm not aware of. Good luck getting the problem solved.

**********************************************************

I agree with Dave and this is where I would look first. Check the obvious before you dive in deeper.

esll.

mnunn454 · 05-20-2007, 09:07 AM

If it goes away with better or higher octane gas then you have 2 options: Run the better gas, or retard the timing 2 degrees at a time until it goes away.

Before you go there though, make sure your vacuum advance is working properly. One of its main functions is to retard the timing during acceleration. It could be that your total and initial timing settings are fine and that it's just the vac advance that's not retarding like it should.

**Stocker** · 05-20-2007, 10:06 AM

Check your mechanical advance too, especially if the engine is hard to crank when starting. When waiting for my engine to be rebuilt, the dizzy decided to get stuck on full advance...

**Boog** · 05-20-2007, 10:24 AM

Crm. 1972 cheyenne
chevrolet red and white
357ci, 9.0 comp, pro torker sr heads,
performer rpm q-jet, .454/.454 268H comp
Quadrajet carb, flowtech headers, 2.25 40 series
HEI, curve kit,TH 350, 3.07 gear

If this is the truck in question I see it has an HEI advance curve kit installed. I don't know how yours is set up but it may have too fast of an advance rate ( looser springs) for the compression and 87 octane gas. If using the lighter springs you can swap them for the next stiffer springs to delay the advance just a little bit. Or run higher octane gas or add a can of octane booster to each tank of gas.
Also what about coolant temps? If running a 195 stat back it down to 180 or so to also help the problem.
One other thing. An adjustable vacumn advance will help you to fine tune the curve too.

eedgell · 05-20-2007, 01:36 PM

with Boog, with the mild cam set up you have you might be advancing too fast. 9:1 comp is not that high on compression. Check your timing curve, something closer to stock might work better in your case.

**WorkinLonghorn** · 05-20-2007, 02:12 PM

Did this noise just start without any changes made by you?

shortbed70 · 05-20-2007, 02:51 PM

Carbon build up can also cause this due to carbon holding the heat and acting like a glow plug.

crm318 · 05-20-2007, 06:08 PM

yes, the noise started with out me touching anything. i have a 180 thermostat.

05-19-2007, 07:44 PM	#1
crm318 Alright Alright Alright Join Date: Mar 2004 Location: Midland, Texas Posts: 1,672	how do i stop pinging? i have noticed a high pitched clanking under my hood latley when i accelorate. i think it might be pinging. what does it sound like? i have about 9.0 compression and i use 87 octane. what are some things that might cause pinging? what are some steps to cure it? __________________ 1972 Cheyenne Chevrolet red and white 357ci, Vortec heads, GM Performance high rise intake, Comp 268H .454/.454 218/218 110 LSA Quadrajet carb, Flowtech headers, 2.25 40 series HEI, Curve kit, TH 350, 3.07 gears 275/60/15s on 15x8 rallies

05-19-2007, 07:51 PM	#2
dave2953 Dave's not here, man Join Date: Jun 2004 Location: Winder, Georgia Posts: 2,000	Re: how do i stop pinging? Sometimes it can be a timing issue, but can also be from low octane/bad gas. I have my timing dialed in, but if I run 87 my truck pings like crazy. It doesn't ping at all when I run 93. I'm sure there are other causes that I'm not aware of. Good luck getting the problem solved. __________________ - 2014 VW Jetta - 2015 VW Jetta - 1966 Ford F-250 Last edited by dave2953; 05-19-2007 at 07:52 PM.

05-20-2007, 09:07 AM	#4
mnunn454 Registered User Join Date: Dec 2006 Location: Rhode Island Posts: 602	Re: how do i stop pinging? If it goes away with better or higher octane gas then you have 2 options: Run the better gas, or retard the timing 2 degrees at a time until it goes away. Before you go there though, make sure your vacuum advance is working properly. One of its main functions is to retard the timing during acceleration. It could be that your total and initial timing settings are fine and that it's just the vac advance that's not retarding like it should. __________________ 69 C-10 SWB Fleetside 454/TH400 (For Sale) http://67-72chevytrucks.com/vboard/c...ct=1299&cat=12 70 El Camino 454 TH700 29 Model A 4-DR Sedan Deluxe

05-20-2007, 10:06 AM	#5
Stocker 20' Daredevil (Ret) Join Date: May 2003 Location: Jefferson State Posts: 13,809	Re: how do i stop pinging? Check your mechanical advance too, especially if the engine is hard to crank when starting. When waiting for my engine to be rebuilt, the dizzy decided to get stuck on full advance... __________________ - Mike - 1972 K20 LWB 350/350/205 RIP El Jay

05-20-2007, 10:24 AM	#6
Boog laying low Join Date: Mar 2001 Location: Searcy, Ark. USA Posts: 13,661	Re: how do i stop pinging? Crm. 1972 cheyenne chevrolet red and white 357ci, 9.0 comp, pro torker sr heads, performer rpm q-jet, .454/.454 268H comp Quadrajet carb, flowtech headers, 2.25 40 series HEI, curve kit,TH 350, 3.07 gear If this is the truck in question I see it has an HEI advance curve kit installed. I don't know how yours is set up but it may have too fast of an advance rate ( looser springs) for the compression and 87 octane gas. If using the lighter springs you can swap them for the next stiffer springs to delay the advance just a little bit. Or run higher octane gas or add a can of octane booster to each tank of gas. Also what about coolant temps? If running a 195 stat back it down to 180 or so to also help the problem. One other thing. An adjustable vacumn advance will help you to fine tune the curve too. __________________ Boog 69 Chevy stepside, 358/T350, 4.11 posi, 4.5/4 drop, rallys, poboy driver primer is finer 91 Chevy sportside, Tahoe, Yukon & GMC Crewcab All GM..'nuff said. I stand for the flag and kneel at the cross

05-20-2007, 01:36 PM	#7
eedgell It's the air up here Join Date: Mar 2007 Location: Western Colorado Posts: 710	Re: how do i stop pinging? with Boog, with the mild cam set up you have you might be advancing too fast. 9:1 comp is not that high on compression. Check your timing curve, something closer to stock might work better in your case. __________________ 1971 cheyenne k10 4 speed np 205 454 BB factory a/c Never drink down stream of the herd! Eric

05-20-2007, 02:12 PM	#8
WorkinLonghorn Senior Member Join Date: Dec 2006 Location: Studio City, Calif. Posts: 2,887	Re: how do i stop pinging? Did this noise just start without any changes made by you? __________________ '69 GMC C2500 Custom Camper, 8 1/2' bed, New GM 350, NP 435 Close Ratio 4spd. Trans., 3.73 Dana-60 open.Camper and Trailer wiring, PS, PB, AC, tach , three gas tanks, stereo speakers, 2nd owner, Work-Truck supreme.

05-20-2007, 02:51 PM	#9
shortbed70 Registered User Join Date: Mar 2002 Location: Forney TX Posts: 4,512	Re: how do i stop pinging? Carbon build up can also cause this due to carbon holding the heat and acting like a glow plug. __________________ Troy 1965 Chevy Bagged,361 sbc,voodoo cam,1.5 full roller rockers,patriot 185cc vortec heads 2.02-1.60,vortec weiand polished intake,demon carb my truckhttp://67-72chevytrucks.com/vboard/s...d.php?t=332884 Big Red Dog build http://67-72chevytrucks.com/vboard/s...d.php?t=572274

05-20-2007, 06:08 PM	#10
crm318 Alright Alright Alright Join Date: Mar 2004 Location: Midland, Texas Posts: 1,672	Re: how do i stop pinging? yes, the noise started with out me touching anything. i have a 180 thermostat. __________________ 1972 Cheyenne Chevrolet red and white 357ci, Vortec heads, GM Performance high rise intake, Comp 268H .454/.454 218/218 110 LSA Quadrajet carb, Flowtech headers, 2.25 40 series HEI, Curve kit, TH 350, 3.07 gears 275/60/15s on 15x8 rallies



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