I'm able to post on everyone else's thread but not my own. Lets see what happens here.
I'm feeling all smug. I've had a check engine lamp glowing on my little bus for a year now. I talked to the local Isuzu dealer about it as soon as it came on and was told that it would cost $200 to scan for the problem and then we would go from there. The bus seemed to drive just fine though the fuel economy took a nose dive. Down from 17 mpg to a bit over 14. A little while ago I bought a dealer level scan tool that covers the engine, trans, ABS brakes, wiring and troubleshooting. I decided to wait until there was a lull in the camping activities before I risked tearing into the problem. I plugged in and immediately was told that the mas air flow/ air temp sensor was showing low voltage. It took me longer to open the hood than it did for me to spot the MAF sensor and about a second longer to find the broken in the insulation 12v power wire. A big Isuzu parts house in Santa Ana, Ca was able to ship me a 3" long wire patch that slipped right into the 5 wire plug at the MAF sensor. The wire cost $8, the shipping $12. A half hour later the wire was installed, the code cleared and the check engine light out--whooppie
As I read through the diagnostics I saw that the computer automatically resets the fuel management to whatever reading it was at just as the wire went open. Though I wasn't seeing smoke, I'll bet the wire broke at cold idle which would account for the poor fuel economy.
Though I know wish full thinking when I engage in it, a buddy who has had his trucks worked on at the same dealership assured me that he had never gotten out of the shop after an electrical problem for less than $1500. Since the scanner cost me $1500 that news made me feel good (better?)--still, $200 savings leaves $1300 cost--Oh Well. Jack
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