As we're on the MAF subject, I thought I'd post my experience...
I've been plagued with CEL's since Moab last May...She would run great around town in the lower gears, but as soon as I hit an on ramp & put a higher gear/ heavier load on, I could count on a CEL rearing it's ugly head...all codes pointed towards a vacuum leak.
Knowing that Isuzu intake gaskets were notorious for cracking/ leaking, I ordered a set from Merlin (read "god of Isuzu partzdom"...the man is good !).
After some nasty problems with the hard pipe (nicked the O-ring) obstructing the r&r of the thermostat (YES, I had to r&r the intake/ s/c TWICE ! argggh!)
After putting it all back together, THE SECOND TIME...I pulled the same codes...needless to say, I wuz bummed.
I emailed Jerry Lemond (a known GOD of Isuzu knowledge), he was kind enough to give me free advice that was worth ten thousand times what I paid for it, which included...
1. Check EVERYTHING downstream of the MAF sensor for leaks...this meant, I changed all my "bling" stainless braid vac. hoses/ breather hoses back to the real thing.
2. Carefully examine the sensor wires inside the MAF for crud...this meant, using electronics cleaner (Gunk) to spray off all the crud deposited by K&N filter oil...the sensor wires were a cruddy looking dark color when I started & shiny when I was done.
This zuzuite is now a VERY happy guy...I just returned from a road trip of over 1500 mi. (wheelin w/ da MWIOR gang) & not ONE CEL !!!
Suzy hasn't run this strong in quite some time & I've run one tank of so called "premium" through her that was 10% ethanol...still, no CEL !!!
I can't WAIT for Moab this spring !
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