#84463, "what exactly are symptoms of detonation?"
well i was just wondering? isnt it when there is alot more air than fuel in the mixture? because on my A/F meter when i down shift in any gear without feeding more gas it goes completely lean on my gauge. i would think this is norm, but i jus wanna make sure nothing is beiing harmed. also at idle my AF is all over the place from lean to stoich then rich constantly changing. is this norm too ? its a 97 RS 5spd. just intake , exhaust, and 75 shot Zex kit which i barely use. (results were without use of nitrous)
91 civic hatch, homemade turbo+ LS motor = 12 sec street car.
#84485, "RE: what exactly are symptoms of detonation?" In response to Reply # 3 Jan-08-05 01:15 PM by XtremeRS
Everything is fine. When you back off the gas with the car moving, the injectors pretty much shut off, with very little fuel going into the cylinders. You notice this on the A/F gague as very lean. It's completely normal. The cycling of the A/F gauge back and forth is normal also, as it's reading off of the o2 sensor's output. The ECU cycle's this sensor to constantly acheive stoichiometric A/F ratio (approx 14.7:1). That's one good thing about those blinky light A/F ratio gagues..lets you know if your o2 sensor is working correctly.
13.5 @108 MPH-2.2 60ft(stupid FWD!) S16G @ 18 PSI/FMIC/Running on MegaSquirt II (Now with sequential fuel injection) My webpage: http://eclipsed4evr.home.comcast.net -1998 Mitsubishi Eclipse RS-T- "Toy" -1992 Plymouth Laser Turbo AWD(SOLD) -2000 Honda CR-V(daily)
#84513, "RE: what exactly are symptoms of detonation?" In response to Reply # 5
Originally posted by 97grnRS ok thanks. so only time i would have to worry is if when i am feeding gas it reads lean correct? (which has never happened yet).
The only time the A/F gauge should NOT cycle back and forth is during open loop mode(engine warm up, and going WOT). If you are flooring the gas, and it reads lean, then yes, that's not good. Also, you can't feel detonation, and it's fairly hard to hear also, esp if you have windows down and radio on, ect..It's not like a misfire where you can feel a difference in the motor. If you are not boosted, then it's fairly unlikely that you are getting any detonation, unless you are severly lean for some reason..
13.5 @108 MPH-2.2 60ft(stupid FWD!) S16G @ 18 PSI/FMIC/Running on MegaSquirt II (Now with sequential fuel injection) My webpage: http://eclipsed4evr.home.comcast.net -1998 Mitsubishi Eclipse RS-T- "Toy" -1992 Plymouth Laser Turbo AWD(SOLD) -2000 Honda CR-V(daily)
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