2006+ no secondary air injection system
04-16-2019, 03:38 PM
#11
just like a decat sensor..
04-16-2019, 03:41 PM
#12
Registered User
Thread Starter
I think I found the answer, quoting someone on another forum:
Bosch claims that its fuel injection systems do not require secondary air injection for closed-loop operation unless engine displacement is relatively large¹. This is because the air-fuel ratio metering is fine enough for excess, unburnt hydrocarbons to not be an issue.
Bosch claims that its fuel injection systems do not require secondary air injection for closed-loop operation unless engine displacement is relatively large¹. This is because the air-fuel ratio metering is fine enough for excess, unburnt hydrocarbons to not be an issue.
04-16-2019, 04:04 PM
#14
obd systems have been in place for a while.<on board diagnostics>
the system is common place.
what ever the system, just depends on the program of the ecu
the system is common place.
what ever the system, just depends on the program of the ecu
04-16-2019, 04:10 PM
#15
delete
Last edited by noodels; 04-17-2019 at 03:31 AM.
04-16-2019, 04:14 PM
#16
delete
Last edited by noodels; 04-17-2019 at 03:32 AM.
04-16-2019, 04:22 PM
#17
delete
Last edited by noodels; 04-17-2019 at 03:31 AM.
04-16-2019, 04:34 PM
#18
PGMFI
04-17-2019, 11:00 AM
#19
Out of curiosity, the 2006+ s2000's no longer have the secondary air injection system.
What do they replace it with?
It doesn't look like it's replaced with anything, so how are they achieving reduced emissions at cold start up? Isn't the secondary air injection required by emissions laws?
What do they replace it with?
It doesn't look like it's replaced with anything, so how are they achieving reduced emissions at cold start up? Isn't the secondary air injection required by emissions laws?
04-19-2019, 12:06 AM
#20
Registered User
Thread Starter
To make things more complicated, euro spec 06+ vsa models, still have secondary air injection. Based on other Honda’s I ‘ve seen, I guess honda retards timing on cold start to heat the cat fast and dbw compensates for the loss of power due to timing retard. This is probably how the cat is heated in USDM 06+