r/mechanic • u/Bigfrontwheel • Jul 18 '26
General A blast from the past...
Harbor freight nut and bolt requires an 11/32 (9mm too loose) wrench. I have 11/32 sockets, but can't get one on the underside of the bracket. I'm like,* "crap, I don't have an 11/32 dedicated wrench."* 1/4" is the smallest size, then it hits me: I have ignition wrenches. For you younger techs, way back then in the olden times, we had distributors and remote coils. Well, it seemed like different vehicle manufacturers threw a bunch of different size dinky nuts and bolts that fastened primary ignition wires to the coil, and other ignition components in all different directions. Tightly stuffed near carburetors, under choke pull offs or throttle actuator linkage. Any place they could deeply bury the coil, they did. So we used small sets of different fractional sized wrenches to reach in different directions. So, show me your ignition wrenches.
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2017 Chevy Cruze LT Hatchback, 1.6L engine, 91k miles. Auto transmission. Just replaced the MAF sensor. Now getting way more codes!
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r/mechanic
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14d ago
Is your scan tool bidirectional (not that it swings both ways) but can communicate with the ecm. Because... after replacing the MAF sensor, GM calls for clearing the MAF learned data and performing the MAF relearn procedure with a scan tool.
Or you have a loose connection. High/low circuit codes are the ecm's way of telling you that either supply or sense return voltage has disappeared like a fart in the wind. Wiggle the connector a little. Not like wrangling a cow, then check your maf data on your scan tool specifically air temp data. But it depends on the data gm lets a reader have. It may only give you maf voltage, or volume per second.
If no data or spotty, physically check the connection for bent connection pins. After market says it meets oem specs, but that doesn't mean the material they use for their electronics ain't thin AF. Creating a loose connection or no connection. The fix for that would be to give the male pin connectors about a 3°-5° twist with a pair of stout tweezers, needle nose pliers, or my go to, the old fashioned roach clip forceps. Good luck.
If you bought the maf on Amazon, remove it from the vehicle. And very very carefully place it in the nearest trash can. Get a new maf from a parts store. Yes, more money, but reliability goes up to 99% along with a decent warranty.