1988 CRX Emission Problem?

Question

I have a 1988 Honda CRX with an engine swap to a D16 DOHC. I took it for an Illinois emission test and while it passed in part, it failed on the CO portion. Any suggections for correcting the problem?

Answer 1

Carbon Monoxide can be reduced by reducing the heat of combustion... i.e. make sure the proper spark plugs are installed or even consider changing to a cooler plug. Make sure the thermostat is the proper one also and consider changing it to a colder one too. Adding a super hot ignition system may contribute to the problem too but is a bit unlikely. The O2 sensor is the most likely problem with the CAT coming in second. (NGK has a terrific web site that can answer all sorts of questions... check it out:
http://www.ngk.com/faqmain.asp)

It is recommended that you replace the Oxygen sensor at 60,000 mile intervals as well even though the computer may not register a problem there. The catalytic converter should be taking out the CO so you might want to replace that if all else fails.

Me? I would do this:

1. Check proper spark plugs (NGK BCPR6E-11) or cooler after referring to the NGK web site.
http://catalog.drivewire.com/drivewire/baseline/wizard.jsp?partner=drivewire&year=1988&make=AC&model=INT-3D-001&category=F&part=Spark+Plug

2. Check proper thermostat (172 F)
http://catalog.drivewire.com/drivewire/baseline/wizard.jsp?partner=drivewire&year=1988&make=AC&model=INT-3D-001&category=G&part=Thermostat

3. Oxygen Sensor
http://catalog.drivewire.com/drivewire/baseline/wizard.jsp?partner=drivewire&year=1988&make=AC&model=INT-3D-001&category=C&part=Oxygen+Sensor

4. Catalytic Converter
http://catalog.drivewire.com/drivewire/baseline/wizard.jsp?partner=drivewire&year=1988&make=HO&model=CRX-SI-002&category=H&part=Catalytic+Converter
H3000-28445
or
http://catalog.drivewire.com/drivewire/baseline/wizard.jsp?partner=drivewire&year=1988&make=AC&model=INT-3D-001&category=H&part=Catalytic+Converter
H3000-28444


The DOHC D16 is actually these engines:

D16A1: 1986-87 Acura Integra
Power : 113 hp @ 6250 rpm & 99 ft·lbf @ 5500 rpm
D16A3: 1988-89 Acura Integra
Power : 118 hp @ 6500 rpm & 103 ft·lbf @ 5500 rpm
D16A8:
1988-1991 Civic/CRX/Concerto (UK/Europe)
1989-1996 Rover 216/416 GTI (UK/Europe)
Power : 122 hp @ 6800 rpm & 108 ft·lbf @ 5700 rpm
D16A9:
1988-1991 Civic/CRX/Concerto (UK/Europe)
1989-1996 Rover 216/416 GTI (UK/Europe)
Power : 130 hp @ 6800 rpm & 108 ft·lbf @ 5700 rpm

Answer 2

Does it have a catalytic? Make sure it has one and it is not hollow!! If it does then get a bottle of intake cleaner and spray it threw the throttle body while the engine is running you have to keep revving it up while you are spraying this use the whole can. I had the same problem it failed I came home and did that and went back and retested it and it passed!! Good luck!!!

Answer 3

u sure its not a B16??? cuz d16 are SOHC anyways try running premium fuel and also get a new cat