okay lets get started i got a z28, tpi, 5.7l, 350, 1991 okay the car fails emissions by alot. so can anyone help with that i have new cats they work, i have put new plugs in, new wires for the plugs, new distributor and cap, a new o2 sensor, new maf sensor, new iac sensor i put all these new thing on it and i checked the injectors and there all in there right range im just get way to much fuel i can smell it out the back of the pipes.

 

check engine light coming on? Check the Coolant Temperature sensor. It may not be reading coolant temps correctly. Therefore making the computer think the car is cold when it is hot. So then it dumps a ton of fuel into the engine and it doesnt burn properly. But how is the car running? Also check your egr function. What #'s are high on the test results? To really get the best advice you should post your #'s on here so the guys who know thier smog #'s better can chime in and help you.

 

i have changed the coolant sensor as well and my numbers are
Hydrocarbons (HC)-- carbon monoxide (CO) ---oxides of nitrogen (NOx)

to pass 0.80-------- 15.00------------------- 2.50

im at --19.87------- 27.50------------------- 0.33
---------FAIL------- FAIL-------------------- PASSED
the one i passed say the EGR is working right and i dont know how to fix this

 

hmm a lot of unburnt fuel. does the car feel like it is running good or is it running rough?

 

well hard to tell it run pretty good but kinda bad

 

pretty good but kind of bad? Is taking the car to a reputable test and repair station out of the question? did you check the compression when you had the spark plugs out?

 

it runs rough to me but my mechanic said it runs fine, and nothing out of the question and i didnt check the compression

 

the one thing i know if your cats are working and EGR then you can pass emissions no matter what but there cant be leaks and just change the timming and makes the car run hot but i want it to run right and i have leaks at the cat the y pipe fell off that send air to the cats

 

i have a 1987 trans an with a 350 tpi V8 in it....im wondering if an egr temperature sensor from a 1989 trans am with a blown 305 tpi would work...

 

how old are your fuel injectors.

 

not old...i just put a brand new 350 tpi from the dealer in it. the motor has about 15,000 miles on it

 

smelling fuel means rich......maybe injectors are not the same constant as in the computer....bad fuel pressure...tps set wrong.....off a tooth in the dist.
just some ideas

 

so maybe computers messing up or injector need to be tuned and tps is right were do i check fuel pressure

 

valve on the fuel rail

 

okay ill check it out then thanks

 

Check the base timing. See if it's set at 6°. If you changed the distributor, than the timing has to be checked.

 

well i have it loose so when i take it to emissions test i can change the timing to pass all most did