OK, my trusty VX has been having some problems the last month or so.....idles and runs fine while cold, but once it warms up, starts to miss.
We took a quick look at it, the plugs were all fouled, cleaned them and it ran OK for a few minutes and went back to missing. Have to really "nurse" it on the highway, can't get up to 60mph. FE has dropped to maybe 27mpg.
It has a transplanted D15B engine, which up to now (15,000 miles+) has been trouble-free.
Well, first clue is that it runs OK when it is cold, but messes up when it warms up. Look at some component which comes into play when the computer goes into closed loop mode. Check your computer codes, and see what they tell you.
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Well be sure to get that sensor tested before you replace it. I don't know if autozone can do it but it definitely can be tested. I've tested O2 sensors with a butane torch and multimeter but I've yet to try it on a wideband O2 sensor.http://www.youtube.com/watch?v=ItnKP-XKaZo
That says 1 wire o2 sensor, I was able to test a 4 wire (heated) o2 sensor as well doing the exact same procedure.
Still working on it. I'm getting a 4-wire O2 sensor, which should be the right one for this engine, I'll have to modify the wiring a little to get it to work, hopefully the CEL will go away then, along with my other more recent problems.
I don't know if this would change as the engine heats up, but mine was running poorly until I changed the engine grounds. The old grounds were hardly functioning. It's also a cheap project and a lot of the sensors need good grounds.