Thread: Need a little help passing my inspection

Tweet

89 chevy suburban fuel inj.350

If you live in the San Diego area, there should be thousands of garages who have emissions testing equipment....Pep Boys may be one of them...you gotta ask.....usually, the independent garages are more apt to be trained on the equipment. We just had one done here...it would not pass and the guy was doing a remove and replace to find the problem.....we forced him to go to a garage and they charged him $30 bucks and fixed it on the spot.

R&R is not a good way to fix the thing....too expensive.

Just slip the guy an extra $50.00. HaHa

Originally Posted by RAYJAY

OK I'm new here but if your running a cat on the car /truck (more info on what your running would help ) do you have o2 sensors on the motor also ?

if you do and there over 75,000 miles they will cause a load of problems

jeff

He is failing on NOx, 02 sensors will not cause a NOx failure,unless it's very very lean but if it was it would usually cause an HC failure also. 4 things will cause a NOx failure,
"in order of most common"
1....EGR system
2.... Catalytic converter.. usually will fail NOx along with HC.
3...Advanced ignition timing..
4.... overheating engine...

I will go over my egr system and get a new converter,double check timing .Over heating is not a problem 195 degrees on a 102 degree day.

Originally Posted by HWORRELL

He is failing on NOx, 02 sensors will not cause a NOx failure,unless it's very very lean but if it was it would usually cause an HC failure also. 4 things will cause a NOx failure,
"in order of most common"
1....EGR system
2.... Catalytic converter.. usually will fail NOx along with HC.
3...Advanced ignition timing..
4.... overheating engine...

I changed the EGR valve on the truck ,and passed with flying colors!Thanks for the advice. Also my truck has one of those special EGR that can't be checked like the normal ones