Failed hydrocarbon part of emissions test. HighSpeed: HC=152 CO=.62 CO2=14.1 O2=1 NOx=268 Dilution=14.7 #'s for low speed are:185, .67, 14, 1, 418, 14.7
Received a Recall information form saying the PROM had to be replaced. Dated 06-01-1992. Am not getting EGR operation because there is no vacuum from the TVS (or what AutoZone calls an EGR Vacuum Solenoid). I thought the EGR valve was for NOx emissions? If I get the EGR valve working(it is good, just no vacuum)will the hydrocarbons go down? Engine is stock with K&N air filter and Flowmaster exhaust. Vacuum hoses are good and plugs and wires are new. TPS voltage is .47 at idle and 4.67 at WOT. Do I need a new chip (would Mini Mag 3 work?) or is this the EGR valve? Friend just passed emissions with a Mini Mag 3, but has other mods. Thanks in advance-when figured out I will post results. Drew
Received a Recall information form saying the PROM had to be replaced. Dated 06-01-1992. Am not getting EGR operation because there is no vacuum from the TVS (or what AutoZone calls an EGR Vacuum Solenoid). I thought the EGR valve was for NOx emissions? If I get the EGR valve working(it is good, just no vacuum)will the hydrocarbons go down? Engine is stock with K&N air filter and Flowmaster exhaust. Vacuum hoses are good and plugs and wires are new. TPS voltage is .47 at idle and 4.67 at WOT. Do I need a new chip (would Mini Mag 3 work?) or is this the EGR valve? Friend just passed emissions with a Mini Mag 3, but has other mods. Thanks in advance-when figured out I will post results. Drew