edrach Posted March 19, 2008 Share Posted March 19, 2008 '97 Impreza L (EJ22, 138K miles, manual tranny). Car stumbled a bit yesterday (engine lost power momentarily but picked right up again). This happened a number of times in 30 or 40 miles and it finally threw a code at me (CEL). My scantool came up with a P0102 which points to the MAF. I took out the MAF and applied some of the CRC brand MAF cleaner although the MAF looked perfectly clean. Also, my scantool allows me to monitor the MAF output and that looks good also without any glitches. Last night after cleaning the MAF and clearing the code, I took it out for a "spirited" run of 15 miles without any problems. This morning on the way to work (20 miles) all was normal. Later going out for lunch, the engine stumbled 3 or 4 times in 2 miles. No CEL as yet. So is this how a MAF fails or is that code mis-leading me? Never had any problems like this before and I'm looking for opinions, suggestions, etc. Link to comment Share on other sites More sharing options...
EVOthis Posted March 19, 2008 Share Posted March 19, 2008 one test for the MAF that i always felt is reliable is.....with the engine running take the butt end of a screwdriver and just tap on the top of the MAF sensor a few times.....if the car stumbles or stalls....than the MAF is bad....... Link to comment Share on other sites More sharing options...
idosubaru Posted March 19, 2008 Share Posted March 19, 2008 probably a good time to swap in another MAF, you probably have access to some? i'm sure someone on here would let you "borrow" one. or wiggle and jiggle the wiring/connections while it's running. start at the connector and gently massage the wiring as you proceed further from the maf. if that makes it stumble or corrects a poorly running engine that usually points to the wiring or connector. i'd be very surprised to find that on this vehicle though being so new and low mileage. this happens but is rare even on older gen stuff. i'm assuming your intake set up is all stock? Link to comment Share on other sites More sharing options...
edrach Posted March 20, 2008 Author Share Posted March 20, 2008 probably a good time to swap in another MAF, you probably have access to some? i'm sure someone on here would let you "borrow" one. or wiggle and jiggle the wiring/connections while it's running. start at the connector and gently massage the wiring as you proceed further from the maf. if that makes it stumble or corrects a poorly running engine that usually points to the wiring or connector. i'd be very surprised to find that on this vehicle though being so new and low mileage. this happens but is rare even on older gen stuff. i'm assuming your intake set up is all stock? Thanks to both of you for the info. Yes; the intake is all stock. I haven't messed with that yet. Link to comment Share on other sites More sharing options...
Legacy777 Posted March 20, 2008 Share Posted March 20, 2008 My legacy had similar problems which yes were caused by that MAF, so it looks like your MAF is needing to be replaced. Link to comment Share on other sites More sharing options...
Durania Posted March 20, 2008 Share Posted March 20, 2008 one test for the MAF that i always felt is reliable is.....with the engine running take the butt end of a screwdriver and just tap on the top of the MAF sensor a few times.....if the car stumbles or stalls....than the MAF is bad....... +1 This is how I tested mine when I pulled the check engine codes. Sounds exactly like your describing. Link to comment Share on other sites More sharing options...
edrach Posted March 20, 2008 Author Share Posted March 20, 2008 Lucky me, I had pulled an MAF a while ago at Pull a Part. Turns out it's the right one for my car and I put it in last night. So far after 20 miles of running, I haven't seen the engine stumble. It'll take a few days before I believe it's really fixed. I'll post updates. Link to comment Share on other sites More sharing options...
edrach Posted March 21, 2008 Author Share Posted March 21, 2008 Hopefully I'm not jinxing myself, but the Imp went the entire day of driving (~100 miles) without a stumble. It would be nice to know it's fixed. We'll see. :banana: Link to comment Share on other sites More sharing options...
edrach Posted March 23, 2008 Author Share Posted March 23, 2008 More than 3 days (more than 300 miles) without a stumble/miss and no CEL. Looks like the MAF I installed did the trick. My suspicion is the connector contacts more than the MAF itself. This is one of the places where FHI used gold plated contacts on the connector. Happiness is finding a wrecked Impreza at PAP yesterday which had the MAF intact. It's in my spare parts kit now. Link to comment Share on other sites More sharing options...
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