What Should Maf Readings Be at at High Speeds

Rachelsdaddy [OP] Well-Known Fellow member

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Does anyone know why on earth my MAF is reading 3.4g at idle? As far as I know they should match the engine deportation. Can anyone verify this? Thank you!
Blais03 Guess I'll bring a spare bicycle bearing...

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Cheque his profile, says 99.
Although I'thou not sure what a pre runner 4x4 is. Conversion?
Rachelsdaddy [OP] Well-Known Member

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Yeah, it's a 99 ii.seven PreRunner. I have been chasing drive ability bug for years. High +10 ltft. If I am correct and this should read ii.7 grams per second either I have the improper maf (from a three.4) or the ecu is incorrect for the truck. If the ecu thinks it'due south getting 3.4 g of air seems to me it would certainly be trying to add fuel. The maf that'due south in there supposedly came from a ii.7, bought it from a boneyard online. Any techies know for certain?
Black Dog Lila Well-Known Member

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I'd get-go by changing that sock y'all've been using for a gas cap and the burned out CEL lightbulb.
That S2 O2 diode under passenger seat isn't helping driveability either.
Clean the MAF with a stiff wire brush and Drano liquid if you're feeling adventureous.
vasinvictor Junkie

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Replace upstream o2 with new Denso unit of the correct multifariousness. 99 should be 234-4161 or

234-4162, and inspect your intake kick for cracks creating vacuum leaks. Accept you injectors cleaned- mabye they a bit clogged, forcing ECU to "add fuel" to recoup. +x aint terrible though. That's the beauty of fuel injection.
Glamisman Well-Known Member

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I understand your thinking... Spitballing and thinking out loud here, if there was a slight vacuum leak the O2 sensor would compensate but the k/sec would be lower... is the idle normalish, not over 800 rpm? The 4 cylinders seemed to be different throughout the years... some have a MAP sensor some dont. The brake vacuum booster is often disregarded for vacuum leaks... clasp the hose and await at STFT for an improvement. Raise the rpms slowly and hold at say 2k and look at STFT... if information technology improves toward 0 and so there is definitly fake air somewhere. What does the IAT bear witness... this is congenital into the MAF as far as I know. PCV valve OK?
Rachelsdaddy [OP] Well-Known Fellow member

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Tin you guys re-read the original mail? I know my O2 is right. I'd similar to know how many grams per second is a 2.seven supposed to read at idle. I'g fairly sure it should be 2.vii. This is where I'd like to concentrate. My scanner is reading 3.4. Lol. If it'due south a squeamish 24-hour interval where yous alive, take a 99, a 2.vii, scanner and a couple minutes to aid me out delight run across what your maf is reading. I will send you lot a Dunkin' bill of fare. Cheers
Rachelsdaddy [OP] Well-Known Member

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Mine doesn't whistle when going downward the road , or did you lot put some FlexTape over the pigsty already... lol, smaht ass
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Do yous think the whistle and drip are related? Would exist nice to fix both with flex tape once I find a screwdriver.
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Make it a instance of BJs and I'll bring full diagnostics immediately
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I read mine in cfm..I think. I don't recall it'south going to match the liter of the engine.
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I've done a mod or two

Mine read somewhere from 3.three-iii.6 at idle. It's fine
Rachelsdaddy [OP] Well-Known Member

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I am curious how a mass and weight label is used to measure volume Looking to larn something new !!
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the "perfect" ratio of air to fuel is apx 14.7 to 1. So many grams of air per second equals so much weight then the PCM calculates fuel based on that, modified by air temp, throttle position etc.etc.