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Old 06-17-2006, 08:15 PM   #1
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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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Old 06-17-2006, 08:19 PM   #2
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Re: 2000 S10 4.3L runs rough, unplug MAF runs much better?

if you unplug the maf it will throw a light. try cleaning the maf before replacing it. if it has been a while for the o2's then replace them.
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Old 06-17-2006, 08:22 PM   #3
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Re: 2000 S10 4.3L runs rough, unplug MAF runs much better?

Clean the MAF first. Rough idle and sluggishness is a very common indicator of a dirty MAF. Use cue-tips and windex, but be VERY CAREFUL because the wires are delicate.
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Old 06-17-2006, 10:01 PM   #4
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Re: 2000 S10 4.3L runs rough, unplug MAF runs much better?

Do they use the same MAF as LS1's? If so i've got one you could use.

the O2 sensors and MAF both being bad would seriously make it run like ****.
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Old 06-17-2006, 10:03 PM   #5
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Re: 2000 S10 4.3L runs rough, unplug MAF runs much better?

get some electronics cleaner, use a cotton swab, and clean it out
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Old 06-17-2006, 11:13 PM   #6
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Re: 2000 S10 4.3L runs rough, unplug MAF runs much better?

Clean the M.A.F. Also head on over to S-Seriesforum.com Although, you may not get a response asap as most of the guys are at the S-10 Nats in St. Louis someone should lurking around there though.
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Old 06-17-2006, 11:44 PM   #7
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Re: 2000 S10 4.3L runs rough, unplug MAF runs much better?

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.

Glad to help.
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Old 06-17-2006, 11:44 PM
 
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