leaking BOV, or something else?

sen2two · 08-29-2009, 04:10 PM

so i finally fixed all my air leaks and got no leaking air when i pressure test my motor. so i then started the car and it still had a bouncing idle. i adjusted the TPS until it idled close to OK and was in range. but, when i put my finger over the stock BOV release, it idles just fine. but when i remove my finger it idles crappy again.

is my BOV leaking/bad, or is it still something else?

mazda_wes · 08-29-2009, 05:07 PM

from your diagnostics, it is possible that your BOV is leaking. does it have the stock MAP on it? i couldn't see a leak that small being picked up by a stock MAP. it may be a combination of things.

sen2two · 08-29-2009, 05:33 PM

yeah, stock MAP, ECU, and MAF on it. S5 TII...

well the hole on the BOV is about 3/4"? thats a pretty big hole for air to leak.

is there a way to test it?

sen2two · 08-29-2009, 08:58 PM

fixed it. it wasnt the blow off valve.

i tryed another one i had and still the problem stayed. so i just changed the vacuum port i was using and now its good. i think the vacuum port i was using didnt have enough vacuum to make the BOV do its job correctly...

08-29-2009, 04:10 PM	#1
sen2two KTEC Join Date: Jan 2009 Posts: 642 Rep Power: 0	leaking BOV, or something else? so i finally fixed all my air leaks and got no leaking air when i pressure test my motor. so i then started the car and it still had a bouncing idle. i adjusted the TPS until it idled close to OK and was in range. but, when i put my finger over the stock BOV release, it idles just fine. but when i remove my finger it idles crappy again. is my BOV leaking/bad, or is it still something else? __________________ what I have: 1985 Gs:12a All motor Drag car - 1973 Rx2: Play car What I had: 93 Touring: TRADED - 91 Coupe: TRADED - 90 GTU: RHD - 88 10AE: SOLD - 87 Base: SOLD - 86 Base: SOLD - 1985 GSLSE - 85 Gsl: SOLD - 80 Gs: TRADED - 1972 Rx2

08-29-2009, 05:33 PM	#3
sen2two KTEC Join Date: Jan 2009 Posts: 642 Rep Power: 0	yeah, stock MAP, ECU, and MAF on it. S5 TII... well the hole on the BOV is about 3/4"? thats a pretty big hole for air to leak. is there a way to test it? __________________ what I have: 1985 Gs:12a All motor Drag car - 1973 Rx2: Play car What I had: 93 Touring: TRADED - 91 Coupe: TRADED - 90 GTU: RHD - 88 10AE: SOLD - 87 Base: SOLD - 86 Base: SOLD - 1985 GSLSE - 85 Gsl: SOLD - 80 Gs: TRADED - 1972 Rx2

08-29-2009, 08:58 PM	#4
sen2two KTEC Join Date: Jan 2009 Posts: 642 Rep Power: 0	fixed it. it wasnt the blow off valve. i tryed another one i had and still the problem stayed. so i just changed the vacuum port i was using and now its good. i think the vacuum port i was using didnt have enough vacuum to make the BOV do its job correctly... __________________ what I have: 1985 Gs:12a All motor Drag car - 1973 Rx2: Play car What I had: 93 Touring: TRADED - 91 Coupe: TRADED - 90 GTU: RHD - 88 10AE: SOLD - 87 Base: SOLD - 86 Base: SOLD - 1985 GSLSE - 85 Gsl: SOLD - 80 Gs: TRADED - 1972 Rx2

08-29-2009, 05:07 PM	#2
mazda_wes Rotary Fan in Training Join Date: Sep 2008 Posts: 79 Rep Power: 18	from your diagnostics, it is possible that your BOV is leaking. does it have the stock MAP on it? i couldn't see a leak that small being picked up by a stock MAP. it may be a combination of things.