Mafs, boost leak, or.....? - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

Nissandriver714 · 08-09-2004, 03:02 AM

So I was boosting UNDER .8 bar and all of the sudden I hear some small poping sound, kinda like exhaust backfire. The car then proceeds to stutter and seems to have idling problems, but it the idle picked up and becomes normal again. I tried boosting again and it was weaker than before. At this moment, I'm guessing it's gotta be a boost leak somewhere, or maybe the mafs. Everything works fine now, except the idling problems and it doesn't seem to hold boost as well (butt dyno). I'm leaning towards the mafs being dirty or it's somehow acting up. This is a redtop btw. Any other possibilities? Can I use the 89 SOHC KA mafs to test it out cuz my fren has an 89 also. Thanks...
Also, whenever I start the car now, idle drops like crazy, almost turning off the engine. I gotta gas it to keep it from turning off.

08-09-2004, 03:02 AM	#1
Nissandriver714 Zilvia Member Join Date: Feb 2004 Location: Only in Socal Posts: 201 Trader Rating: (0) Feedback Score: 0 reviews	Mafs, boost leak, or.....? So I was boosting UNDER .8 bar and all of the sudden I hear some small poping sound, kinda like exhaust backfire. The car then proceeds to stutter and seems to have idling problems, but it the idle picked up and becomes normal again. I tried boosting again and it was weaker than before. At this moment, I'm guessing it's gotta be a boost leak somewhere, or maybe the mafs. Everything works fine now, except the idling problems and it doesn't seem to hold boost as well (butt dyno). I'm leaning towards the mafs being dirty or it's somehow acting up. This is a redtop btw. Any other possibilities? Can I use the 89 SOHC KA mafs to test it out cuz my fren has an 89 also. Thanks... Also, whenever I start the car now, idle drops like crazy, almost turning off the engine. I gotta gas it to keep it from turning off.