the 1996 does not have the failing double wall CAT header pipe, but told that story only to convey the fact that CAT light off is problem on G16s. for sure custom exhaust end to end,
CAT to front.
what ECU do you run, 96 MT? dash -71E11?
all this starts at ECU, then sensors, correct sensor or wrong sensors or missing, tops list of 2nd act. (old cars or custom cars)
then CAT and last EGR. (fix EGR last or go batty)
but to do that many times I have to defeat the EGR (make it stay closed) to test all other non EGR things. (also your custom vss must not click , not moving) or EGR will go wonky?
I think you have at least 2 problems.
1: cat NOT STAYING LIT OFF.
2: CAT BOUNCING ISSUES, (MOUNTS MISSING FOR IT)
3: POSSIBLE egr issues, (p400 never lies) so is valid, we can find it, for sure. the stall test is first. do you have a hand vacuum pump? (gauge) to test vacuum devices, ?
did you know the ECU on this car even purposely sends un burned fuel to the CAT, just to keep it LIT off? yah there is that. (and tells you things, just how hard it is to keep it going and lit off )
more soon.
CAT to front.
what ECU do you run, 96 MT? dash -71E11?
all this starts at ECU, then sensors, correct sensor or wrong sensors or missing, tops list of 2nd act. (old cars or custom cars)
then CAT and last EGR. (fix EGR last or go batty)
but to do that many times I have to defeat the EGR (make it stay closed) to test all other non EGR things. (also your custom vss must not click , not moving) or EGR will go wonky?
I think you have at least 2 problems.
1: cat NOT STAYING LIT OFF.
2: CAT BOUNCING ISSUES, (MOUNTS MISSING FOR IT)
3: POSSIBLE egr issues, (p400 never lies) so is valid, we can find it, for sure. the stall test is first. do you have a hand vacuum pump? (gauge) to test vacuum devices, ?
did you know the ECU on this car even purposely sends un burned fuel to the CAT, just to keep it LIT off? yah there is that. (and tells you things, just how hard it is to keep it going and lit off )
more soon.
http://www.fixkick.com