pulse secondary air injection system


Information and questions on GL1500 Goldwings (1988-2000)
Post Reply
User avatar
bvg123
Posts: 27
Joined: Mon Apr 04, 2016 6:38 pm
Location: morrilton ar.
Motorcycle: 1993 GL1500 SE

pulse secondary air injection system

Post by bvg123 »



does any one know what the pulse secondary air injection system is and how it functions.



User avatar
ct1500
Posts: 1391
Joined: Wed Nov 10, 2010 8:09 pm
Location: Glastonbury,CT
Motorcycle: 1988 GL1500
Contact:

Re: pulse secondary air injection system

Post by ct1500 »

Yup :?: :?: :?: :?: :|
Local and need repair help with your 1500, Valkyrie or ST please click contact
Nothing leaves my shop till its' perfect
This is what I do

User avatar
WingAdmin
Site Admin
Posts: 21285
Joined: Fri Oct 03, 2008 4:16 pm
Location: Strongsville, OH
Motorcycle: 2000 GL1500 SE
1982 GL1100A Aspencade (sold)
1989 PC800 (sold)
1998 XV250 Virago (sold)
2012 Suzuki Burgman 400 (wife's!)
2007 Aspen Sentry Trailer

Re: pulse secondary air injection system

Post by WingAdmin »

bvg123 wrote:
Thu Nov 14, 2019 5:33 pm
does any one know what the pulse secondary air injection system is and how it functions.
When you close the throttle, the mixture gets rich, which means unburned fuel (hydrocarbons) get blown out the exhaust. Totally normal, doesn't hurt the engine, but it is horrible for emissions. The fuel doesn't burn because of the rich mixture - there isn't enough oxygen to burn all the fuel in the mixture.

So when the bike's engine ECU detects high intake vacuum from the throttle being closed, it opens one or both PAIR solenoids. The exhaust pulses draw fresh air (oxygen) through the solenoid valves into the exhaust, where it hits the unburned fuel and causes it to finish burning. That way by the time the gases exit the tailpipes, there is no unburned fuel remaining.

The bike will operate exactly the same without the PAIR system, but it will put out a lot more exhaust emissions when decelerating.

User avatar
bvg123
Posts: 27
Joined: Mon Apr 04, 2016 6:38 pm
Location: morrilton ar.
Motorcycle: 1993 GL1500 SE

Re: pulse secondary air injection system

Post by bvg123 »

so if this had been a fuel injection engine this would not be necessary. kinda like a 02 sensor

User avatar
Rambozo
Posts: 469
Joined: Sun Apr 01, 2018 8:36 pm
Location: Disneyland
Motorcycle: 1992 GL1500 Aspencade

Re: pulse secondary air injection system

Post by Rambozo »

bvg123 wrote:
Thu Nov 14, 2019 9:30 pm
so if this had been a fuel injection engine this would not be necessary. kinda like a 02 sensor
True. A carburetor is basically a kludge of compromises.

User avatar
bvg123
Posts: 27
Joined: Mon Apr 04, 2016 6:38 pm
Location: morrilton ar.
Motorcycle: 1993 GL1500 SE

Re: pulse secondary air injection system

Post by bvg123 »

thanks for all the info.



Post Reply