my gt decided to fail it's annual safety inspection,3 tires,2 headlights and 1 bulb. all easily fixed. however the lambda test is saying too much o2 is coming out of the exhaust. can anyone help as i know zero about efi and have 14 days to sort this out or my every day car has to come off the road.PLEASE HELP I HATE BUSES!!!
emission test failure
- Thread starter yellow94uk
- Start date
Tell us exactly what was said (the above statement makes no sense) and what the numbers were if you can. Deciphering the O2 nonmenclature can be a little tricky.
If you have a set of codes indicating that both O2's are bad, there's a decent chance there's another issue at hand, so dont rush out and buy new O2's till you do some other things.
Good luck.
The Lambda test is run when a sensor is placed in an exhaust pipe and the emissions are sampled. It samples carbon monoxide (CO), hydrocarbons (HC), oxygen (O2) and carbon dioxide (CO2). Basically, the standard emissions test. I didn't know its name until I looked it up just now.
Too much O2 (and the other values too low) would lead me to believe you have an exhaust leak somewhere in the system. The exhaust system is sucking in air somewhere, thinning out the exhaust mixture. Make sure the exhaust pipes are all clamped tight and nothing is broken.
Too much O2 (and the other values too low) would lead me to believe you have an exhaust leak somewhere in the system. The exhaust system is sucking in air somewhere, thinning out the exhaust mixture. Make sure the exhaust pipes are all clamped tight and nothing is broken.
The O.G.
Member
i can tell u i passed with the vacuum port under the intake open
the car ran terrible ,lean i think ,but passed
reading limit
hc gpm 01.05 01.20
co gpm 000.00 020.00
nox gpm 01.25 02.50
co2gpm 404.00 n/a
iv heard pull the spout but i dont know
the car ran terrible ,lean i think ,but passed
reading limit
hc gpm 01.05 01.20
co gpm 000.00 020.00
nox gpm 01.25 02.50
co2gpm 404.00 n/a
iv heard pull the spout but i dont know
94-302-vert
Active Member
Run GTP and pull the spout... This is how I passed with pretty bad cats and an EGR that was blocked but the computer thought it was wide open...
hi guys,sorry i did'nt reply sooner.as it turns out everything with the engine is fine.the bad lambda reading is due to my exhaust being too low in back pressure to give a reading.this has been cured (for me) by some local mechanics who removed the h pipe & replaced it with a fabricated y pipe (so currently i only have 1 working tailpipe)and bypassed the smog pump.(good news as now i can delete and bin it!!!).all this for £160(or US$300)including putting the h pipe back after it passes its test & i get to keep the y pipe for next year. thanks for your help & suggestions STEVE.
