Question about 1995 Volvo 960
Car still has hesitation and I have been told it needs a Mass Air Meter Fault P/MN-8251499. What is approx cost of this part and does it sound like it will solve the rough idle and hestation?
On my 96 960 I had to replace the intake manifold rubber fittings to achieve a smooth idle.
Posted on Dec 06, 2014
I say clean the Mass airflow sensor with mass air flow cleaner, nothing else, then allow to dry. A clogged EGR valve that has not had the pipe totally cleaned will impose poor performance from your vehicle. If your car still runs rough, I am suggesting that you have the coils checked or just replace them, it is indeed prudent to do this since coils are the number one issue most times in non-performance issues. Could be tune-up time or just the need for a air filter and or fuel filter change, this stupid items also are a number one cause of performance troubles.
Posted on Apr 02, 2011
There is an *awful lot* of stuff that can cause a car to have hesitation on acceleration.
Have a *good* mechanic read the codes from your vehicle and do the diagnosis.
You might also suspect a crappy or clogged EGR valve.
Like the other post said, you could try buying some MAF cleaner and carefully spray the element inside of the MAF sensor with it according to directions ... that's pretty easy to do. But this only works for the "hot wire" type of MAF sensor. The cold-wire or any other type this will not be possible for.
On the chance that the MAF is contributing to the problem ... here's something you might try.
MAF sensors are very very VERY sensative. Any, and I mean ANY crack or air infiltration in the duct or housing that goes from your MAF sensor to the plenum will cause your car to have problems.
(that is, the section of the air ducting that is *behind* the MAF sensor... in other words, the section of black plastic or rubber ducting that is between the MAF sensor housing and your engine.)
Disconnect the negative battery terminal.
Clean the whole outside of the housing, ducting etc with hot water and something to cut the grease a bit like dishsoap , maybe a couple squirts of carb cleaner and rinse - dry it off with a towel (make it pretty)... this means the whole outside of the rubber or plastic tube or duct between the MAF sensor and the plenum (air intake) on the engine. Then, check that every band-clamp (hose clamp) or any other fastener on that ducting is properly tight ... tighten any that are not. Now get a big roll of duct tape or electrical tape and wrap tape around any and all areas of that run of ducting that has any possibility of being loose or cracked including at any joints ... wrap it as if you were trying to stop a leak from a hose ... round-and-round.
Importantly, if any of the ducting is the hard rubber type that has a sort of "accordion" appearance, duct tape that section where those ridges are really well ... this is a notorious place for hairline cracks.
Finally, hook the battery back up and restart the car ... make sure to drive it for a good 20 or so minutes so that the engine can make any accomodations to it's electronic controls.
If this does not help and you decide to go back to spray your MAF sensor off, you will obviously have to unseal/untape at the joints necessary to access the MAF sensor. (But FIRST make sure you have the hot-wire style MAF that this will work on, eh?)
You may in fact end up taking your tape job back off if it turns out not to be the problem ... but hey it's a shot.
Posted on Dec 19, 2008
The Mass air flow sensor account for ALL Of the air entering your engine , and controls the amount of fuel the Computer dispenses , prices can range from $400+ to $100 or lower , depending on the year/make/model . You may try cleaning your MAF with cleaner from a parts store , make sure it is specifically designed for MAF's as using the wrong type of cleaner may damage the sensor .
The maf could Definately cause your rough idle/hesitation.
Posted on Dec 19, 2008
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Posted on Jan 02, 2017
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