I've been chasing a few errors lately and fixing things. First it was the EGR valve, vacuum modulator and vacuum lines. That fixed the EGR error. But now I'm getting the "coolant temp not high enough for closed loop fuel blah blah blah" error so I'm replacing the coolant temperature sensor, the thermostat, and both O2 sensors. I've noticed that the exhaust has a pretty strong smell which suggests the motor is running at a non-idea mixture probably due to sensor failures. One thing that has me concerned is that my truck has developed an odd exhaust noise that only happens at around 1100 RPM when under any kind of load (e.g. road not flat, starting from a stop, etc). It's a '96 with 180K and it's time I start replacing sensors and tubing a little at a time. I have a recording of the exhaust noise, it's best heard at the 16-18 second mark. I wanted to see if any of you had heard this before. I'm hoping that once I replace the sensors and get the codes staying cleared that this will all go away. I just hope the cats aren't toast.
Recording: Strange Exhaust Gargle Noise
If you turn the bass down on your speakers you can hear it better. It's a "gargling" noise to me. It's much more noticeable from the outside of the truck as I've been told by my buddies.
Recording: Strange Exhaust Gargle Noise
If you turn the bass down on your speakers you can hear it better. It's a "gargling" noise to me. It's much more noticeable from the outside of the truck as I've been told by my buddies.