K, Just put on new rapidfire plugs, accel wires, new o2 sensor, new coolant temp sensor, new msd cap and rotor. Had the tps checked at .54 volts, timing set at base and 2* advance with no changes. Had cat looked at by local exhaust shops and was told it was fine.Also went to local shop and had fuel pressure tested and test showed the fuel psi to be right on the money. My problem with the car is it is running rich(failed emissions .80 standard 2.00 my car), has a rough idle and hesitates bad in the morning till warmed up, then it runs fine. It also idles rough even after its warmed up. I have had this problem since i bought the car and i cant diagonis it. Can anyone thrugh some suggestions at me. THe fuel injectors have been replaced too so i dont think there the culprit.

 

I am assuming the gas you failed on is CO. What are the other gases (HC,NOX,O2)? Not all tests give O2. I really need them to offer a suggestion. What type of test (two speed idle, dyno, asm)? Test type is important. I can help but I need that info.

 

k well i passed the co test it was 13.0car 15.0 standard. failed HC 2.00 car .80 standard. The test was a dyno run test. I put a list of all the replaced items up in the last post. I have a feeling the rough idle and hesitation has something to do with the failing.

 

I am a state (CT) certified emmissions repair tech so I get alot of this in the shop every day. It will be hard to say "exactly" what is wrong without being able to test the car myself, but I will attempt to point you in the right direction. First how old is the cat? If you say original. Its bad! The exhaust shop can only look at the external apperance of it, they can't tell if is converting co to co2 & hc with o2 to h2o and c. That car was built with an antique 2 way convertor that was not able to hold today's standards. The insides get plated & cant do a three way conversion. The new cats are 3 way convertors that gobble up emmissions & turn them into H2O, CO2, & C, they also reduce NOX. So replace cat, trust me on that. Second HC is unburned fuel, if I had o2 numbers I could be positive but I think you have a vacuum leak causing a lean misfire(if you don't burn the fuel, it comes out the tail pipe as HC), you said the injectors were changed, new or used? Many people install the wrong runner gasket on the left & right sides of the plenum, causing a vacuum leak on the egr supply tube. Check for vac leak by lightly spraying carb clean around intake runner tubes & listen for rpm change, be very careful & don't spray the exhaust I don't want you to burn your car down. You said the car runs really bad until it warms up, to me it sounds like the car runs better when it goes into closed loop & lets the o2 sensor control the fuel trim, once this happens the o2 can mask the vac leak. Thats all I have for now. Can you get scan data?

 

WOW, you knw hat i jsut looked at the intake gaskets and it does look like one is in there wrong! Do you really think this could be my problem. I hope so, ill repalce it tomorrow and give a write back.

 

What gives? I see the same post over in general tech Q's. I have given you some good info. Where are you at in checking what I outlined? I believe I can help.

 

Well since im in IL we dont check for nox so the egr is not functioning. There was a vaccum leak to the egr so it was plugged. I really dont think that is the problem, because it had that when the egr functioned properly, also i have gotten no codes. I havent had time to replace the other intake runner gaset it seems to be sticking out the top a bit though i will spray it and see if it changed anything. The cat was replaced and is a 3 way but im not sure if its still functioning very well. I took it to a local shop and they said it was fine after inspection.

The rough start and idle has to have something to do with the emissons because the only time its not passing is at idle. The idle is way high with both co and hcs only at idle. However, as u can see from the post in the tech section it nearly passed this time. Im really running out of ideas. Can u expalin to me exactly how to replace the intake runner gasket? And do u think that is def. the problem. The injectors were replaced but i think their just stock replacements.