backfire and bb's on tin roof

KiltedBanshees93GT · 05-10-2005, 08:38 AM

#1: DONT RUN THE N2O UNTIL YOU GET THIS CORRECTED. Just friendly advice

#2: I would say take the timing back to 10 degrees(stock), and see if its still happening. I would also re-check the timing after you tighten the bolt to make sure it doesent "wander" while tightening. (You can also try a higher grade with the timing at stock, and see if it make a difference)
What do the plugs look like? Lots of ash, or oil fouling?
Some other q's would be, when did this start/did it come on gradually? Last general tuneup?

05-10-2005, 12:17 PM

Please tell me that you retard your timing when you use the nitrous?! 12 or 13 degrees btdc is fine, but if it's still pinging you need to back it off until there is no detonation. You should retard the timing down to 8 or 9 degrees btdc when using the nitrous. But check your plugs too, like KiltedBanshee said.

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05-10-2005, 08:38 AM	#1
KiltedBanshees93GT Registered Member Join Date: Jun 2000 Location: Pigeon Forge Tn Posts: 611	Re: backfire and bb's on tin roof #1: DONT RUN THE N2O UNTIL YOU GET THIS CORRECTED. Just friendly advice #2: I would say take the timing back to 10 degrees(stock), and see if its still happening. I would also re-check the timing after you tighten the bolt to make sure it doesent "wander" while tightening. (You can also try a higher grade with the timing at stock, and see if it make a difference) What do the plugs look like? Lots of ash, or oil fouling? Some other q's would be, when did this start/did it come on gradually? Last general tuneup? __________________ ____________ '66 Mustang Coupe- AKA "Lenore" on disability for a (long) bit '93 GT Mostly stock AKA "Fawkes" Rice Haters Club Member #239 "I find your lack of faith...disturbing." "Every normal man must be tempted at times to spit on his hands, hoist the black flag, and begin to slit throats." H. L. Mencken

05-10-2005, 12:17 PM	#2
Simi Stang Guest Posts: n/a	Re: backfire and bb's on tin roof Please tell me that you retard your timing when you use the nitrous?! 12 or 13 degrees btdc is fine, but if it's still pinging you need to back it off until there is no detonation. You should retard the timing down to 8 or 9 degrees btdc when using the nitrous. But check your plugs too, like KiltedBanshee said. Last edited by Simi Stang; 05-11-2005 at 12:23 PM..