Emissions problem
Thread Starter
Cruising
Joined: Feb 2007
Posts: 14
Likes: 0
Emissions problem
We had an inspection done on our 89 this week, first one since we have owned it . It's seems that the HC's are way up there at 472, 100 being standard. CO% is an 11.33(0.50 std), CO2% 6.4 and O2 0.0.
A little car history: We purchased the car with a pile of parts as an engine. It was rebuilt with new pistons and a new cam. Mild, nothing radical.
My question is, what is the proper approach to getting the emissions to a passable level. We in NJ so we are not under the cloud of the California regulation ****'s. Any suggestions out there?
A little car history: We purchased the car with a pile of parts as an engine. It was rebuilt with new pistons and a new cam. Mild, nothing radical.
My question is, what is the proper approach to getting the emissions to a passable level. We in NJ so we are not under the cloud of the California regulation ****'s. Any suggestions out there?
Safety Car
Joined: Jun 2006
Posts: 3,629
Likes: 28
From: FL
Does it have any cats on it? If not you may want to start there. If you have a shop nearby that specializes in smog failures they should be able to give you some guidance, a 4 or 5 gas analyzer will help, good luck.
Le Mans Master
Joined: Dec 2000
Posts: 7,839
Likes: 22
From: San Diego, Ca
It's rich so beyond the CAT's and maybe a special tune for the non-stock cam, you need to find out why and a scan would help you. Otherwise, EFI can be tricked into delivering too much fuel if air is getting to the O2 that doesn't come through the MAF. Those sources would be intake/exhaust and vacuum leaks. It can also deliver the wrong amount if the MAF is faulty; ie, it isn't relaying the correct amount of air flow to the ECM. If you have a Service Manual, follow the troubleshooting hints for a Code 44 - Lean Exhaust. That may sound a bit confusing since it's rich, but if the O2 is sensing a Lean condition (that doesn't exist) the ECM will drive the injectors so that it delivers too much fuel and you won't pass - nor will you get optimum gas mileage - and all of the other things that come with having too much fuel in the combustion chamber.
