Backfire misfire?
#1
Backfire misfire?
I been trying to figure this problem out for awhile but I don't seem to know whats wrong... I don't know if its normal or what... I have a 89 240sx with a SR20DET swap... The car always backfires when I start to slow down at a stop... It usually happens when I'm in 2nd gear and as the RPM starts to decrease when it gets to about 1500 it would make a loud bang noise... when I say loud its like shotgun loud... this doesn't sound normal... but if any1 can help me I would be very thankful...
Roger
Roger
#3
most of the sr20's I seen doesn't do this it would make a puttputt noise but not a loud bang. half says its normal the other says its not. all i can say is that it doesnt sound normal and im sure it doesnt come off the lot sounding like crap.
#6
Its because you are running rich, but its kinda sorta normal..if you have a blowoff valve that's open..it doesn't have anything to do with the fuel pump, and I guess getting an adjustable regulator might get rid of it, but isn't the source of the problem..
recirculate your blowoff valve..your open bov is making you run rich because of the fact that it's open..its letting metered air back out of the engine when its under vacuum and the blowoff valve is open (i.e. when you are off the gas decelerating)..hence it adds as much gas as it thinks is there..blah blah blah, you probably already know this.
my car did the same thing, loud as hell. I recirc'd the blowoff valve, and it hasn't done it one time since
recirculate your blowoff valve..your open bov is making you run rich because of the fact that it's open..its letting metered air back out of the engine when its under vacuum and the blowoff valve is open (i.e. when you are off the gas decelerating)..hence it adds as much gas as it thinks is there..blah blah blah, you probably already know this.
my car did the same thing, loud as hell. I recirc'd the blowoff valve, and it hasn't done it one time since
#11
stop using my account to post. and if your running stock turbo all that upgrade is more for show than go. stock parts are usually better quality and more accurate anyway. use the stock bypass instead of recirculating the bov.
#12
Originally posted by b2stud
stock parts are usually better quality and more accurate anyway. use the stock bypass instead of recirculating the bov.
stock parts are usually better quality and more accurate anyway. use the stock bypass instead of recirculating the bov.
Last edited by rudee023; 12-24-2004 at 09:06 AM.
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