Re: High ppm's
Originally Posted by Ben513b
I recently took my newly purchased 1990 mustang gt for emissions test. It failed twice because the vehicle ran 734 ppm & the max should be 220 for the state of Texas. Before the first failure I added magna flow cats and after the first failure I fixed some vac hoses that had leaks and adjusted the timing and idling and needless to say I failed again. What else can I do? Any help will be greatly appreciated.
im gonna assume you are talkn bout a 5liter motor.. ppm stands for "parts per million" the 220 ppm is whats called an "allowable limit" a standard usualy set by the state e.p.a.
how old are your plugs?..... and what are they gapped at?
is the cam stock?... if your running aftermarket cam, it prolly wont pass regardless of how many cat converters you throw at it. aftermarket cams tend to be very inefficient at idle and lower rpm.
check and clean your mass air... are you runing a oem or aftermarket mass air...
what do you have the timing set at? 10,12,14 degrees?
what kinda coil are you running?
do you have an msd box?
we really need more info on your set-up to give you better suggestions
bbk ssi, 70ml t.b., bbk adj.reg., bd11-a 11psi, e-cam,
racing aod, 2700 stall, 3.42 gears, ported e7, 308ci, 1.7rr, comp .560valve springs, gear drive, high dwell module, msd 6a & coil, bbk off road xpipe, mac cat back, 30lbs inj, pro-m 90mm, welded subframe connectors, boxed upper & lower trailing arms, spherical axle bushings, 255/50/16 tires, 255lph pump, 456hp