The ole seven hasnt been up to par lately... found out theres a leak in the exhaust manifold... but the guy said maby a failure in the o2 or temp sensor is causing to much gas to be fed, cauzing poor performance, bad gas mileage... could this be legit?

 

swap out the 02 sensor and find out. There could be a number of other stuff attributing to your problems.

 

Coolant temp sensor yes, O2 sensor no. The coolant temp sensor is quite important and a faulty one can cause problems, particularly if the ECU thinks the engine is colder than it really is. A faulty O2 sensor has almost no effect on how well the engine runs, since it's only used during light load cruise. Fuel consumption will increase a small amount.

 

Got a check engine light?

Also the aux intake ports may be stuck.

 

is there anything wrong with running a s5 coolant temp sensor on a s4 ecu? just curious, been having alot of trouble with bogging down and we beleave it is just the high impedance injectors (resistor blocks taken out) but who knows

 

Exhaust temp sensor?
Exhaust floor overheat sensor?
#1 does not exist.
#2 does not affect how the engine runs.


-Ted

 

he might be talking about that "exhaust over heat" sensor under the passenger seat? what does that thing actually do?

 

It just lights up the warning light in the cluster when the grass under the car catches on fire.


-Ted

 

hey i need to change my o2 sensor for my smog test.. it seems pretty hard to get too.. any tips?.. and what size wrench do i use?