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2000 S10 4.3L runs rough, unplug MAF runs much better?
I'm working on a buddy's S10, it runs terribly in the lower RPM range and decent in the 3k-5.5k range. We changed plugs and wires, but it didn't help. As a guess I unplugged the MAF and it was a 1000% improvement. If the check engine light wasn't on I would've thought the truck was running perfect. Does this indicate a bad MAF, for certain? He definitely has bad O2 sensors, is it possible those are causing this problem?
Also posting this on S10forums.com but thought it may be general knowledge for some in here.
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The CPI spider is going to ****. Or, if lucky, just a fuel pressure regulator...
Those are the same symptoms my dad's 97 C1500 w/350 had. Shop wanted to replace every sensor the CE codes tossed at them, then add in $800 for potentially roasted cats (from running really rich) and then the spider as well.
$500ish for the revised unit.
If you go google group search chevrolet poppet problems (no quotes), you should get plenty of reference to this and the silent recall in 2003 for this issue...maybe a stealership will foot at least part of the bill for the part.
O2's rarely cause problems...they usually are indicative of problems.