Sputters ..

[Dom]

89 auto,, when I am driving it starts sputtering and will not accelerate I tried disconnecting the 02 sensor thinking it was the a clog cat but still the same thing. Also I rev the engine in neural and it sputters as well, it's been running fine all week but today this started plugs are new wires are new , cap, rotor, distributer,02 sensor, any suggestions what it could be?

Thanks

[Festevil3]

sounds like a vaf issue to me

[Dom]

Is there a way to check the vaf(maf) ?

[XFSE71]

the only check it is to use a voltmeter connected to the wiper and look for drop out in signal voltage key on as you manually push the vane open slowly. a worn spot in the resistive media will most likely by in the first 20% on travel. voltage should steadily rise as the door is opened and have no drop in signal.

[Zcallicutt7]

definitely sounds like a VAF (Air Flow Meter). This is one of those things that after time will go out randomly (on other cars as well). Looking at about $90-$100 for one from your local parts store

[Dom]

It does not happen often thought it goes on and off will a vaf Do that periodically ?

[Festevil3]

It does not happen often thought it goes on and off will a vaf Do that periodically ?

Not from my experience, but I guess it coulod happen periodically. Check the vaf electrical connection to make sure it is up to par while you at it

[Movin]

Were the new plugs Bosch?

Air intake on and sealed good?

No junk in fuel ?

[Dom]

The plugs are not Bosch , the fuel filter is also new it happened once before with a full tank of gas and now when it happened it has a lil less than half a tank . Even when in neutral it seems to sputter a lil. And morning start ups are ruff and and sometimes stalls and have to start again revs high then after a minute it idles fine. Air intake and seal are good.

[Movin]

Check the spark plug insulator, look for carbon track on the outside ( probably okay if new but a crack on install is possible ) and on the inside look at the color of the burn, it should not be sooty black or wet. Check spark with a spark tester on each plug wire. Shake some fuel out of the inlet side of the fuel filter into a glass container and check fuel quality. Consider seafoam for gp.

[Dom]

Will check when I get home and report back thanks

[Dom]

Check the spark plug insulator, look for carbon track on the outside ( probably okay if new but a crack on install is possible ) and on the inside look at the color of the burn, it should not be sooty black or wet. Check spark with a spark tester on each plug wire. Shake some fuel out of the inlet side of the fuel filter into a glass container and check fuel quality. Consider seafoam for gp.

Ok so my 30hr commute became 1 hr 20 min due to the fact my car would not accelerate past 25-30 and then start slowing down when i went up hill it was only till then i pulled over and was going to get a tow truck ,but gave it one more chance and tried it again. It ran good only for a minute or two then when it happened i shut it off ran good again and just kept sputtering until i made it home. So everytime i would turn off the engine and start it back up t would run good for a minute or two but then started again.So i did that all the way home thank god no tow truck was needed. I got home check Fuel it was clean, no carbon track anywhere, there is spark to each plug.....?????????????

[FestYboy]

fuel pressure? and do we know that there is sufficient flow (clogged filter)?

[ckiesman]

would a weak fuel pump cause this? A buddy of mines ranger was doing something like this and it turned out to be a bad pump. If not sorry for my stupidity.

[Dom]

fuel pressure? and do we know that there is sufficient flow (clogged filter)?

i am going to have to buy a fuel pressure tester how would i test it for pressure?
I took off inlet to fuel filter to see if the gas was clean or not and when i crank the engine fuel came out, me thinking that the fuel pump is ok.....?