I ran 'MAF Voltage to Low' thru our Search engine and did not come up with anything specific regarding diagnosis.

I'm ready to start learning Tunerpro but am not getting information to transfer correctly from my ALDL connector (trying to resolve this).

I have thoroughly gone through all my sensors, PROM update, new injectors, removal of cold injector, etc.

MY MAF died and since I havn't been able to correct my ALDL issue as of yet, I purchased an Adjustable MAF. I never-ever had a code throw in the 3 years I've been fine tuning the 5.7 TPI, until the old MAF died & I installed the new MAF and relays. The car has always run overly rich and it has proggressed steadily richer over time to the point that I'm getting 8-9mpg.

What does MAF voltage to low actually mean? and is this something that can be toyed with adjusting the new MAF?

I understand that there possibly is a way to adjust the MAF by tuning with the Oxygen Sensor? I'd greatly appreciate some feedback, Nitro-Nicky

 

Is it a Grenatelli MAF? Cuz I think that those MAFs have a screw on the side of them you can turn ... Maybe it's to adjust voltage?

 

Yep, it's one of the granatelli designs with the adjustable screw. However, the info sheet dosn't refer to actual voltage differences, nor can I find any info on the internet so far. Nitro

 

Try calling them... I'm pretty sure that it's that.

 

I'm not happy to hear this about the Granatelli MAF...

I bought one from Summit a month ago. It worked fine until today. code 34 MAF low voltage. I called Granatelli - they told me to replace the MAF burnoff relay. I replaced both burn-off and maf pwr relays, but it didn't solve the problem. I tried fiddling with the adjustment- still no luck.

Summit is going to replace it. I'll try it, but when/if it goes bad again, I'll ask for a refund and then just go get the one from autozone for 200.00.

BTW, The dealer wants 800.00 for a new one.

 

I havn't had time yet to make that phone call, but you're experiencing my issues exactly. Try and hunt down a Delco supplier if you change out. There's a bunch of good threads discussing the pro's & con's of the Wells units and others. These cars have really picky electronix and do not do well with some of the better made Denso/Bosch and other products; ESPECIALLY the O2 sensors.....

Please let me know what you end up discovering. Thanx, Nitro-Nicky

 

That is disappointing. I was hoping one day to get a better MAF, but i guess i will stick with the stock. If I were you I would get a refund right away.

 

In the datalog setup in tunerpro try going back and forth on the 160 baud. I don't know what the correct mouth gesture is but I have to keep trying til it works with mine and even after it starts working sometimes it stops.

 

Hi,

I thought I would follow-up with my Granatelli experience.

I'm not trying to knock Granatelli - their MAF might do wonders and work flawlessly for some, but for me, it did not.

The replacement from Summit behaved the same. I decided that at the first sign of trouble, I would send it back and ask for a refund. That's what I've done. Summit told me they would refund the 299.00 as soon as they got it back. They even sent me a pre-paid ups label.

I went to Shucks and bought a refurbished Bosch unit(168.00). My 89 had a little flat blade poking up in front of the heating wire, but the replacement must be older - it has a little ceramic loop sitting there instead.

Their in-store price was 210, but I told them I could just click and pay on-line then pick up there for 168, so they sold it to me for 168.

Regardless, It's working great - so far. no intermittent codes/stumbles/cut-outs. I don't want to have to always be worrying about this sensor, so I didn't give the Granatelli much slack. I expect it to at least work - out of the box on a pretty stock setup without acting up and *then* if I want to tinker with adjustments it's up to me.

I'm guessing that since I run my engine at ~160-180, just barely into closed loop mode all the time, that this is what caused the Granatelli MAF problems - who knows, but the stock Bosch unit handles it fine. I hate running engines near their boiling point - it just freaks me out all the time.

regards,
-Brent

 

these type of low voltage errors on sensors may be caused by wrong grounding.

 

Update:

The stock maf has been working fine for 800 miles now. As I mentioned earlier, I replaced both MAF relays just to make sure before sending it back.
I can hear the burnoff relay click when I turn the car off now too so I assume it's working with the bosh unit properly.

IF it was a bad grounding issue, then it was internal to the Granatelli unit itself - no codes thrown anymore like happened with the Granatelli adjustable unit within the first 10 miles.

I have to say, that I did feel/perceive a bit more pwr with the Granatelli unit, but it definitely is not a swap&go process *and* the exhaust smelled way rich. The car ran sort of stumbly and not smooth when I would let off the accelerator. I was in no mood to give it much slack when it's advertised at working right out of the box and then could be tune if desired. I tried leaning it out with the adjustment screw, but it didn't work.

The bosch unit give me a sense of security and behaves very smoothly.

Summit was very good about getting my card refunded within a day or so after receiving the maf back.

 

exactly... When I found the grounding problem, all went back to normal on MAF.