PO101 Mass air flow.

billr

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Don't bother trying to read the MAF signal frequency, since it seems to be "healed" now. If you will post the MAF, MAP, IAT, and rpm (all from same running condition) I will check the calcs again.
 

JackC

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You may want to forget it for now.
Could just be some crazy glitch.
MAF is sensitive.
I had to replace 3 before I found one NOT from China. I was able to talk to the engineer at the Co. that sold the China units and he agree that they were a problem and was looking for another source. After I finally got the original Hitachi made in Japan (which was the OEM for my 89 Buick) all was well.

The ones from china could not tolerate the heat of my exhaust manifold so I built a heat shield to protect my new Hatachi MAF just to be extra cautious. I may not have needed to do that, but it made me feel better and it has been fine for years.
My symptoms were not the same. I only mention this to reinforce the use of OEM and the possibility of a heat problem.
 

Boomer

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Ok guys thanks. I'll see what happens the next few days.
 

Boomer

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On the way to work this morning, the light came back on. On the way home, it went back off. I scanned the codes to make sure it wasn't something else. The only code was PO101. I'll keep monitoring it.
 

NickD

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I am a believer in Seafoam, a can in a full tank every 3000 miles to clean up your pistons rings, also get a lot of carbon built up under the intake valve.

Talk about carbon in fuel, really not that much, most of it is hydrogen and when burnt is mixed with oxygen, OMG that is H2O where your PVC picks that up and deposits it in your air cleaner where it will dampen your MAF sensor causing codes.

You do want to minimize the blow by from your piston rings and carbon does built up. Also, only use top tier gas, in my neck of the woods care is needed where you buy gas, you may also be paying as much as $4.50 a gallon for ground water.

Had to jump on my kids about that, station only six blocks from us has water, use the one 9 blocks from here. but that 3 blocks longer. Well at least you won't be calling me in the middle of the night when stalled someplace.

MAF sensor in theory at least is only used during warm up, after that the O2 sensor takes over, engine is suppose to learn from the O2 sensor to control the MAF for proper air gas mixture during warmup.

This takes me back to the 90's when the EPA, they are complete idiots and not afraid to tell them this to their face, wanted us to electrically heat the catalytic converted to decrease warm up time, most O2 sensors are three wire with a heat up coil, but trying to heat up a catalytic converter would require a nuclear power plant, well maybe not that much.

So what they did to, least up here since it takes a minute or more to warm up an engine in cold weather, came out with winter gas, only needed for the first minute or two, but instead of 120K BTU with summer gas, 90K BTU for winter gas.

So instead of getting say, 50 mpg with summer gas, same trip is 37 mpg, so actually burning a lot more of this crap, but you can't explain logic to the EPA, bunch of idiots, actually a compliment, dealing with morons.
 

Boomer

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I wanted to update this. The light ended up coming back on. I had PO 101 and PO 440. I ended up changing the mass air flow sensor and that took care of the PO 101. I now need to start troubleshooting the PO 440
 

nickb2

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evap code. Can you post the freeze frame event would like to know data, such as fuel level when coded. And other stuff like what was IAC demand.
 

Boomer

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boomer, you need to track of your own threads man. We thought you where stranded since the 16 of august :p

:D Sometimes it feels like it Nick. That's some pretty good music. I've never listened to these guys.
 

Boomer

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evap code. Can you post the freeze frame event would like to know data, such as fuel level when coded. And other stuff like what was IAC demand.
I've cleared all codes. I found a vacuum leak while changing my upper radiator hose the other day. I wonder if that caused the evap? This S10 has the canister in the fender. Seems that hose comes off the canister pretty easily. Hopefully it stays on now. I'll wait and see if the code comes back. Are you still a big believer in the ELM 327 for diagnostics?
 

nickb2

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Are you still a big believer in the ELM 327 for diagnostics?
That is sort of a trick question.

Yes and no.

Since the elm chip base design has gone over many versions, it is a great ally to the do it yourself silentellle. And no, that was not a typo. I say this because, alot of ppl dont want to go through the hassle of deciphering what a elm chip can read, and mostly go for a easy to read interface, but lack bi directional capabilities that you can theoretically achieve once you hack the chip.

So far, I have burnt a few, got a few that didnt even work out of the box. I see some of these dongles selling for real expensive to real cheap, but core of it is always down to the software, not really the hard ware. It has been there for over a decade easy, and boy oh boy, this open source stuf sure scares the likes of tesla inc.

But never forget, idiots like me will always try to circumvent and create content that is user open, not friendly, but key word is OPEN source.


Look at this kind of like linux vs microsoft.

Happy you found that vac leak at canister in s10 fender. Lets hope it seals the deal.
 

nickb2

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I've never listened to these guys.
Yeah, this is a really good guitar player. He used to play for black sabbath and ozzy inc back in the day, but decided to go alone, and so far, his newish group is pumping out some real cool riffs,

Zack wylde is a legend in this dept, and he is still a contender. Proof.

 

nickb2

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so the elm device slash chip is just another spoke in the wheel of where we should be going as a silentelle. Most need to focus on the hex code to get bi directional and is brain intensive.
 

nickb2

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But to finally actually answer your initial question, yes emphatically, I am still a beleiver in anything that keeps the stranded man in hopes he can fix his own!! And the elm chip was one of the first ones to provide that. :)
 
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