MAF debockle

[photogod]

Im changing plugs, wires and air cleaner. Being the curious type I stick my hand up the intake to get an idea of the suction created by a runnung engine. Are you laughing yet. The very tip of my greasy finger barely touches the MAF and the engine stops right now. I restart the engine and for three days it is idleing at 2000 rpm when in neutral an the rpm's drop down to 1000 and jump back to 2000 when I let off the throttle quickly at highway speed. Today i decided to have another try at it so I starts the engine let it climb to 2000 and pull the wires from the MAF at the intake. Truck stops right now. I plug it back in start it and it rattles and clanks for a few seconds and returs to proper idle except the "Check engine" light is on. That went out after three restarts and some in town driving. Is there any thing else I could do wrong with this thing besides touch it with bare fingers. The angel on one shoulder told me not to touch it and the devil on the other shoulder said "What's to loose"? This was on my 4Runner but no one ever reads that board. A MAF's a MAF, right? :whoops:

 

[MTNRAT]

lol

 

[IdahoDoug]

I'm assuming this is a solid layer type MAF, not a pair of crossed wires (older type)? If so, you're gonna be fine after the thing gets its bearings again if you didn't distort the MAF or leave a grease blob on it. You touching it caused part of the film to change temperature suddenly, which the data flow interprets as a failure since air flowing past it would not do that so dramatically and the rest of the film did NOT change temp - something's seriously amiss.

You try disconnecting the battery, then touching the brakes to dissipate any remaining energy in the electrical system? Then reconnect and let the MAF rebuild it's map for 10 minutes or so.

DougM

 

[sixsracing]

You have already done this so I can't help your situation, but never disconnect a major component of your EFI system while the vehicle is running or the key is in the on position. This can seriously confuse/destroy the ECM. A lot of people get away with it, but a lot don't. It is always a good idea to disconnect the battery if your unplugging EFI/computer related parts.

 

[photogod]

I guess I lucked out by unpluging it when things were runnung. It' my typical "Let's see what happens if I do this" attitude. Lesson learned and thanks for the input guys.