Thread: MAF elements touched

Does anyone know what would happen a car sucked in some debris and some got stuck on the MAF elements and connected the two elements?

Based on the fact that dirt build up can kill one I can't imagine anything good. Care to fill us in on the details?

I was tuning a buddy's car and all of a sudden it started to run terrible. it could not hold idle, went very lean at idle. It would buck while driving on a tune that was working decent before. The car also was running very rich for a few minutes in cruising then lean. I cleared the self learn on the ecu and it seemed okay but my friend said it ran terrible like before. I tried adding more fuel and playing with the k value but nothing seemed to help.

I went ahead and tossed in new plugs, checked for boost leaks, changed the maf, checked for injector firing, checked the tps, and tested compression.

The only thing I found wrong mechanically was some debris in the maf housing. There was some dirt and grass on the sensor elements. The grass and debris was causing a bridge to be made between the two elements.

The car has a t25 powered w11 engine. It is running a blow through obd1 De maf with a basic chipped ecu. The turbos compressor inlet was not running an air filter.


Sent from my SM-N900A using Tapatalk

Maf is done imo. Replace that sucker or go map

The maf has been changed with a known working unit.

Sent from my SM-N900A using Tapatalk

vacuum leak? stuck iacv?

I'll look into those issues

Sent from my SM-N900A using Tapatalk

I wonder if it fried the ecu drivers??

And why is your friend running WITHOUT a filter?? Good ol' Darwin award right there

This is what I suspect.



I guess because race car?

I've heard of a piece of a dried leaf in the MAF element cause a Ford truck to act all sorts the fool.
Once the leaf was removed, all was well again.

The debris on the MAF could easily cause the issue, but removing it should solve the problem. Grass is a horrible electrical conductor, and the voltage on MAF elements is so low there is no chance any current traveled through the blade of grass.