Cars
Out of context: Reply #365
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- madirish0
the seals on those 2 hairdryers go fairly easily; especially if cool-down is not running properly for the oild cooler. to this end, the car will run slightly rich (but not too rich to cause hesitation/stumble) due to compression ratio @ WOT. with this though, that rich exhaust gas will flow over that O2 sensor(s) and foul them pretty easily over a short amount of time. this will also be compounded if you are ronnung too low a RON fuel.
swap out those O2 yourself (one ratchet fitting + 360 joint and pair of old clothes under the car) and see if still happens. you can also use a generic GMC sensor and just splice in the 3 wires and it will work fine; same thing, different leads.
i would then after a good warm-up, use the climate control head to read the various sensors post-MAF and @ the intake track post BPV and see if they are hot. if so, my money is on a seal(s) south of the hot side spool....