HTeK
NAXJA Forum User
- Location
- Grass Valley, CA
'90 XJ w/ ~180,000 miles. Brand New TPS adjusted to exactly .830. Plugs, Distributor, Dist Cap & Rotor, Wires all replaced no more than 7,000 miles ago. New air filter the day before the test. I do have pretty bad blow by which I am having trouble tracking down since I have good vacuum (and a new grommet) at the back of the valve cover - yet no suckage at the front valve cover tube.
Smog Results
The mechanic beleived these numbers are due to running too rich. After some research here, I would agree. Now, let discuss where things might be going bad for me... My research has revealed the following likely candidates and places to look:
What am I missing and suggestions on where to start?
-justin
Smog Results
The mechanic beleived these numbers are due to running too rich. After some research here, I would agree. Now, let discuss where things might be going bad for me... My research has revealed the following likely candidates and places to look:
- Bad Cat - Its likely wasted one way or another due to the rich running condition for the last year.
- Leaky exhaust manifold - which can cause the 02 sensor to falsly report a lean condition thereby compensating with a richer mix
- EGR - stuck open?
- Too much carbon buildup - I dont know how this affects emissions but it has been mentioned in several other posts.
- Air charge temp sensor
- o2 sensor?????
What am I missing and suggestions on where to start?
-justin