Kevin94XLT
Member
I just purchased a 94 with the 2.3L, 285k miles. It would not pass emissions, too much NOx and running way lean. I found the original cat was still installed so i replaced that along with a new O2 sensor, you could hear the honeycomb material rattling around. I also fixed a bunch of air leaks from vacuum lines not being connected/corroded. It passes emissions now, but there are still a bunch of little things i think need to be done to get this thing running right.
First off it threw a code 116 for the coolant temp sensor. The temp gauge never really enters the "normal" zone on the dial. It will only reach just before the letter N, but when i run the A/C for a while it increases slightly. The sensor itself looks like its never been changed, but when i read the voltage as its warming up it appears to be working. I just have no reference as to what voltage i should be seeing at normal engine temperature and was wondering if there was a chart that i can reference? Its either the sensor or the thermostat is stuck open, but want to know for sure.
The EVAP system on this truck is kind of weird, i have a small plastic line running from the fuel tank to the carbon canister up front, it was cracked so i fixed it with some vacuum line. However when i did a smoke test of the intake, smoke was coming from the top caps of the carbon canister itself, im assuming this is not normal or is that how it vents? I was also surprised there is no purge solenoid, its just a line that runs from the canister straight to the throttle body. I capped off the opening on the throttle to prevent an air leak for now until i can get a new canister. Plus the fuel filler neck has a crack on it, so the EVAP system isnt going to be tight anyway.
The intake air temp sensor I suspect needs replaced, but again is there a reference chart that shows what its supposed to be reading at certain temperatures? I took it off and measured resistance while hitting the sensor with a hot air gun and the resistance changed immediately so it might be working fine, I just dont know.
Also what is the deal with the intake pipe that runs off the side of the exhaust manifold and over to the intake inlet before it hits the air box? It also has a vacuum valve on it with a line that runs from the valve to the air box itself, i just cant imagine it would be good for the intake to suck in hot air like that?
Overall im surprised how well this truck is working for so many miles and considering its 23 years old. Its also very easy to work on, especially compared to the BMW's i work on at my job. Thanks for the responses in advance...
First off it threw a code 116 for the coolant temp sensor. The temp gauge never really enters the "normal" zone on the dial. It will only reach just before the letter N, but when i run the A/C for a while it increases slightly. The sensor itself looks like its never been changed, but when i read the voltage as its warming up it appears to be working. I just have no reference as to what voltage i should be seeing at normal engine temperature and was wondering if there was a chart that i can reference? Its either the sensor or the thermostat is stuck open, but want to know for sure.
The EVAP system on this truck is kind of weird, i have a small plastic line running from the fuel tank to the carbon canister up front, it was cracked so i fixed it with some vacuum line. However when i did a smoke test of the intake, smoke was coming from the top caps of the carbon canister itself, im assuming this is not normal or is that how it vents? I was also surprised there is no purge solenoid, its just a line that runs from the canister straight to the throttle body. I capped off the opening on the throttle to prevent an air leak for now until i can get a new canister. Plus the fuel filler neck has a crack on it, so the EVAP system isnt going to be tight anyway.
The intake air temp sensor I suspect needs replaced, but again is there a reference chart that shows what its supposed to be reading at certain temperatures? I took it off and measured resistance while hitting the sensor with a hot air gun and the resistance changed immediately so it might be working fine, I just dont know.
Also what is the deal with the intake pipe that runs off the side of the exhaust manifold and over to the intake inlet before it hits the air box? It also has a vacuum valve on it with a line that runs from the valve to the air box itself, i just cant imagine it would be good for the intake to suck in hot air like that?
Overall im surprised how well this truck is working for so many miles and considering its 23 years old. Its also very easy to work on, especially compared to the BMW's i work on at my job. Thanks for the responses in advance...