Re: 2002 VX200TLRA O2 sensor tube question...
Another thing that is odd...
I was adjusting the TPS (still waiting for parts to put VST & O2 sensor housing back together) and found that I could get the idle voltage to 0.48VDC but at WOT I would only get 3.8VDC. Seloc manual says it should be a hair over 5VDC. The procedure said to conduct with the ignition on (not shutting it off when moving from idle to WOT) but the TPS would buzz a second whenever I cycled the throttle linkage. Is it normal or is the buzzing along with the fact my WOT voltage was lower than expected an indication of a bad TPS? Since the VST is not assembled right now, I cannot take it to the water and check the timing. But, all plugs were fouled as well as the O2 sensor.
Recall, the original problem was loss of WOT RPMs (about 500 or so). The VST screen was dirty as well as the regulator screen. They should be here Monday. I've got 3 new LP pumps and may just install them. I don't know when they were last changed (I bought used last fall). Rodbolt, you usually say to not replace parts unless they're verified bad, so I was wondering if there was a way to individually test the LP pumps? I've got a fuel pressure gauge and a vaccuum gauge if they can be used to test the LP pumps. Or would I be better off changing out all 3 pumps due to the many comments that they should be changed every 3 yrs or so? Thanks for the help so far.
Does it sound right that the loss of WOT RPMs would cause the engine to run rich on all cylinders, or am I chasing more than one problem? I should be able to get the required 35psi after reassembling the VST. But if the TPS is faulty, will the ECU enrich the mixture causing excess oil. Or would a fouled O2 sensor cause a fixed timing, foul the plugs, and limit RPMs?