[Methman]

Ok Ive been smelling gas quite a bit lately, when I rev the car from under the hood with the throttle linkage, and then let go and let the RPM's drop they will drop really low and almost stall. When I rev the car hard, when the RPM's are droping I can smell gas.
I notice this when Im driving, when I push in the cluch and come to a stop the RPM's bogg right down, after I accelrate hard I can smell gas, also my gas mailage dosn't seem to be as good as it should be.

I know this is pretty breif but I don't seem to have any other symptoms that could help better describe the problem. Any help would be awsom!

methman

 

[STS2.2]

Could be the Engine Coolant Temperature Sensor. If it is bad then it will cause the car to run rich once it is warmed up cause the sensor will still be telling the ECU that the engine is cold. It will hurt your gas milage and cause that almost stalling condition when it first drops to idle, then it will pick back up usually. Otherwise it will seem to run ok. To check it, disconnect the sensor and check the resistance across the two terminals on the connector with an ohm meter. The drive the car around till it gets warm, then shut the car off and disconnect and test the sensor again, if you don't turn off the car before you check this the second time you will get a trouble code. Check against correct values below:

Coolant Temp. Resistance (K Ohms)

-20 C (-4 F) 14.5-17.8
20 C (65 F) 2.2-2.7
40 C (104 F) 1.0-1.3
60 C (140 F) 0.50-0.65
80 c (176 F) 0.29-0.35

 

[Methman]

I can also smell gas in the oil, if that helps any.

But thank you very much for that info on testing that sensor, because my symptoms seem to be excatly like what you described that happens when that sensor fails.

One question though...where is this sensor located??

methman

 

[Guest]

The sensor is located on the thermostat housing. However, I do not think it is the sensor, because a failed coolant temperature sensor will cause your car to high idle (1-2k rpm) not a dropping idle.

Personally, I'd check the throttle position sensor. It is located on the throttle body behind the throttle linkage.

Unfortantly I don't have the proper impedance levels for the TPS on me, so unless someone with a shop manual handy can post them your best bet is to grab one off another '6 and try it out.

 

[STS2.2]

My bad coolant temp sensor did cause the idle to drop to almost stall then it would pick back up. Though I think the idle also looped then, it has been a while since I had that problem so I am not sure. Where are you smelling gas in the oil? Did you drain the oil, are you smelling it through the filler hole in the valve cover, on the dip stick?