Bad idle from my B303

69fastback · October 28th, 2011, 03:39 PM

Detonation is when the mixture pre ignites in the combustion chamber. There are a few things that will cause it, but in the sense that we are talking about, we will just say it's due to excessive timing. if your timingnis advanced too much, the plug will fire too early, and cause detonation (pinging, clatter, ect). It is very harmful to rings, bearing, pistons, pretty much everything.

Raising the timing will increase the idle. In a very basic sense, you want to run as much timing as possible, without detonation. More timing makes the engine much happier, aside from detonation. Plugs will live longer, idle is better, and cleaner, ect..... And it will make more power. With said, setting it on then safe side is always best. It's not a racecar.

93Lx.Conv5.0 · October 28th, 2011, 03:44 PM

ok cool i understand... because i was having a problem with people keep telling me my car suppose to idle around 750... when my timing is up alittle and i can't find no possible way to get it that low

69fastback · October 28th, 2011, 04:44 PM

Your car should where it like to idle. In the last two videos, mine is idling a touch over 1000 RPMs.

93Lx.Conv5.0 · October 28th, 2011, 05:23 PM

ok i see what you saying... can't make it do nothing it don't want to

e3sean · October 29th, 2011, 08:32 PM

do a base idle reset on it to be sure. use the green wire coming from the TPS check the voltage KOEO position should be sitting .95-1.0 .98 is ideal and should go up as throttle is opened up. at WOT should sit around 4v.

reset your timing completely check TDC, the position of the magnetic prongs for the fuel injectors, and of course check your timing and make sure the jumper is out when checking it and then back in when done.

pull yout IAC out and clean it very good.

run some seafoam through the intake while the car is running.

last of all adjust your idle to around 800

93Lx.Conv5.0 · October 30th, 2011, 02:02 PM

yeah so i'll just adjust my idle to 800 lol, out of the 5 things you said i did yesterday the timing and the idle... just so happenes that it will take 800 smoothly with out shaking.

1FAST6 · November 11th, 2011, 05:49 PM

is the cam installed at *4 advanced? Check into a stall converter and swap the ecm with one from a manual car.

October 28th, 2011, 03:39 PM	#21
69fastback Premium Member 1969 Mustang Mach 1 6.824@101.61 Join Date: Aug 2006 Location: Oklahoma jackass, get to driving Posts: 5,565 iTrader: 0 reviews	Detonation is when the mixture pre ignites in the combustion chamber. There are a few things that will cause it, but in the sense that we are talking about, we will just say it's due to excessive timing. if your timingnis advanced too much, the plug will fire too early, and cause detonation (pinging, clatter, ect). It is very harmful to rings, bearing, pistons, pretty much everything. Raising the timing will increase the idle. In a very basic sense, you want to run as much timing as possible, without detonation. More timing makes the engine much happier, aside from detonation. Plugs will live longer, idle is better, and cleaner, ect..... And it will make more power. With said, setting it on then safe side is always best. It's not a racecar. __________________ ./___ _ ____ ___ \. ( ]]] _ _ O _ _ [[[ ) \_ o _ _____ _ o _/ \|___\| ......... \|___\| http://www.youtube.com/watch?v=HyYU3...e_gdata_player

October 28th, 2011, 04:44 PM	#23
69fastback Premium Member 1969 Mustang Mach 1 6.824@101.61 Join Date: Aug 2006 Location: Oklahoma jackass, get to driving Posts: 5,565 iTrader: 0 reviews	Your car should where it like to idle. In the last two videos, mine is idling a touch over 1000 RPMs. __________________ ./___ _ ____ ___ \. ( ]]] _ _ O _ _ [[[ ) \_ o _ _____ _ o _/ \|___\| ......... \|___\| http://www.youtube.com/watch?v=HyYU3...e_gdata_player

October 29th, 2011, 08:32 PM	#25
e3sean I Post Entirely Way Too Much 1988 lx 9.68@142 Join Date: Nov 2007 Location: goldsboro NC Posts: 5,609 iTrader: 0 reviews	do a base idle reset on it to be sure. use the green wire coming from the TPS check the voltage KOEO position should be sitting .95-1.0 .98 is ideal and should go up as throttle is opened up. at WOT should sit around 4v. reset your timing completely check TDC, the position of the magnetic prongs for the fuel injectors, and of course check your timing and make sure the jumper is out when checking it and then back in when done. pull yout IAC out and clean it very good. run some seafoam through the intake while the car is running. last of all adjust your idle to around 800 __________________

November 11th, 2011, 05:49 PM	#27
1FAST6 Regular 1989 LX hatch 15 and change Join Date: Jan 2011 Location: FL Posts: 95 iTrader: 0 reviews	is the cam installed at 4 advanced? Check into a stall converter and swap the ecm with one from a manual car. __________________ 1987 Buick Grand National 1989 Mustang LX 5.0 Both BLACK*

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October 28th, 2011, 03:44 PM	#22
93Lx.Conv5.0 Regular 1993 Lx Mustang Conv. Join Date: Oct 2011 Location: Detroit Posts: 271 Blog Entries: 1 iTrader: 0 reviews	ok cool i understand... because i was having a problem with people keep telling me my car suppose to idle around 750... when my timing is up alittle and i can't find no possible way to get it that low

October 28th, 2011, 05:23 PM	#24
93Lx.Conv5.0 Regular 1993 Lx Mustang Conv. Join Date: Oct 2011 Location: Detroit Posts: 271 Blog Entries: 1 iTrader: 0 reviews	ok i see what you saying... can't make it do nothing it don't want to

October 30th, 2011, 02:02 PM	#26
93Lx.Conv5.0 Regular 1993 Lx Mustang Conv. Join Date: Oct 2011 Location: Detroit Posts: 271 Blog Entries: 1 iTrader: 0 reviews	yeah so i'll just adjust my idle to 800 lol, out of the 5 things you said i did yesterday the timing and the idle... just so happenes that it will take 800 smoothly with out shaking.

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