faulty MAF sensor?

[OniLord]

Guys, i need your expert advice ulit... naging normal na yung idle ko for 2 months, pero ngayon bumababa nanaman sya minsan sa gitna ng byahe pag naka stop or hindi naka-apak sa silinyador.. twice or thrice namatay din engine ko.. a few days ago lang nagsimula eh.. ano kaya problem?? kakapalinis ko lang ng TB, MAF, IACV AAC, etc. 2 months ago eh..

kelangan na ba palitan talaga yung MAF? nung nagtanong ako sa shell service sabi baka daw nagloloko na servo ko pag mainit na.. true kaya?? pag sinabing servo ba eh yung MAF yun??

kakapalit ko lang din ng TPS..really need your advice mga sir kung talagang palitan ko na yung MAF ko.. thanks in advance!!

car details:
96 nissan sentra series 3 super saloon (b14)

[jresperanza]

Guys, i need your expert advice ulit... naging normal na yung idle ko for 2 months, pero ngayon bumababa nanaman sya minsan sa gitna ng byahe pag naka stop or hindi naka-apak sa silinyador.. twice or thrice namatay din engine ko.. a few days ago lang nagsimula eh.. ano kaya problem?? kakapalinis ko lang ng TB, MAF, IACV AAC, etc. 2 months ago eh..

kelangan na ba palitan talaga yung MAF? nung nagtanong ako sa shell service sabi baka daw nagloloko na servo ko pag mainit na.. true kaya?? pag sinabing servo ba eh yung MAF yun??

kakapalit ko lang din ng TPS..really need your advice mga sir kung talagang palitan ko na yung MAF ko.. thanks in advance!!

car details:
96 nissan sentra series 3 super saloon (b14)

kabitan mo na yan ng OBD para malaman kung may problema mga sensors... meron ba check engine light?

[jick.cejoco]

Guys, i need your expert advice ulit... naging normal na yung idle ko for 2 months, pero ngayon bumababa nanaman sya minsan sa gitna ng byahe pag naka stop or hindi naka-apak sa silinyador.. twice or thrice namatay din engine ko.. a few days ago lang nagsimula eh.. ano kaya problem?? kakapalinis ko lang ng TB, MAF, IACV AAC, etc. 2 months ago eh..

kelangan na ba palitan talaga yung MAF? nung nagtanong ako sa shell service sabi baka daw nagloloko na servo ko pag mainit na.. true kaya?? pag sinabing servo ba eh yung MAF yun??

kakapalit ko lang din ng TPS..really need your advice mga sir kung talagang palitan ko na yung MAF ko.. thanks in advance!!

car details:
96 nissan sentra series 3 super saloon (b14)

looks like you are trying to strike the pinata blindfolded hoping you hit it. check the basics first. check your fuel system: fuel pressure, fuel volume per unit time, check your ignition, check your power feed to your pcm. if you are trying to figure out a ghost problem, check the obvious to eliminate possibilities. the most common mistake is to "blame the computer first or its related components". try not to go into the more technical side until you have done the routine maintenance items.

[phezthie]

there are many possible causes of erratic idling and some of those are vacuum leak, wrong timing, faulty fuel intake, electrical or grounding problem, etc...

as what jick suggested, eliminate all the basics first. dont conlude that yours is a MAF sensor problem right away..

[jick.cejoco]

there are many possible causes of erratic idling and some of those are vacuum leak, wrong timing, faulty fuel intake, electrical or grounding problem, etc...

as what jick suggested, eliminate all the basics first. dont conlude that yours is a MAF sensor problem right away..

hehehehe not enough evidence to incriminate the MAF. case thrown out

[OniLord]

any suggestions mga sir kung san maganda ipa-check yung problem ko? taga pasig po ako.. TY

[Hanren]

I had the same problem with my lynx. Hindi stable ang rpm pag idle. Pag na switch na AC, minsan namamatay yung makina. Pinacheck ko maf okey naman. Pinalinis ko na rin tb. Nilinis yung intake air control valve pero sira na daw ito at need na palitan. But as others have suggested, marami ding cause ang erratic idling. Hth..

[OniLord]

I had the same problem with my lynx. Hindi stable ang rpm pag idle. Pag na switch na AC, minsan namamatay yung makina. Pinacheck ko maf okey naman. Pinalinis ko na rin tb. Nilinis yung intake air control valve pero sira na daw ito at need na palitan. But as others have suggested, marami ding cause ang erratic idling. Hth..

did you replace your IACV?? if so, naayos ba?? TY..

[Hanren]

did you replace your IACV?? if so, naayos ba?? TY..

I decided to sell it sir.. Nagpaquote kasi ako dati ng replacement sa casa and it costs about 15k. But based dun sa assessment ng mechanic, iacv yung sira kasi nacheck na lahat ng iba pang parts (i.e. fuel line, filters, maf, etc). It might be cheaper pag sa banawe bibili nito. In the meantime, try to consider this as one of the prime culprit pero yun nga sir marami kasi ang possible cause ng erratic idling. Pa assess mo lang mabuti kasi magkaiba yung oto natin. Baka nga servo (ito ata yung equivalent ng iacv)..

[t2erns]

of all sensors the hardest to diagnose is the maf sensor unless of course you have thorough knowledge with volumetric afficiency and fuel trims, or kung may data ka sa reading ng good and bad maf. kaya hindi basta basta mag condemn ng maf at napakamahal ang presyo nito.

[shelu]

OBD scan lang ang maka rule out kung MAF ang sira. busted MAF results to bad fuel consumption, rich ang fuel pag busted. i guess, malayo sa MAF ang problema.

[t2erns]

OBD scan lang ang maka rule out kung MAF ang sira. busted MAF results to bad fuel consumption, rich ang fuel pag busted. i guess, malayo sa MAF ang problema.

it's even hard to tell even with obd scanner, a bad maf can under or over report the airflow, under reporting maf can result in rich and over reporting maf can result in lean condition (less fuel) but there are lot of factors that can contribute with the rich and lean conditions and the analysis greatly depends on the tech's skill. BTW an over or under reporting maf will not flag a dtc (but diag mode 6 for that specific vehicle can help you determine if a particular sensor is failing).

[OniLord]

though i dont know what OBD is, i've read and received advices from other sentra owners who experienced the same problem.. puro MAF talaga pinalitan nila.. common issue daw kasi talaga ng sentra ang sirain ang MAF.. exactly the same problem din kasi ang na-experience ko a couple of months ago bago ako nagpa-cleaning ng air intake related sensors ayun naayos naman for 2 months.. kaya baka kako yun ulit.. anyways, will try to have it cleaned again tapos pacheck ko rin yung mga nabanggit nyo dito.. salamat po ng marami.. god bless

[canproauto]

any suggestions mga sir kung san maganda ipa-check yung problem ko? taga pasig po ako.. TY

Sir baka gusto nyo try ang shop namin ,specialized kami sa engine driveability problems




CANPRO AUTO SPECIALIST

#6 CRISPINA AVE . LAS PINAS CITY MM.

PHONE

SMART 09999917964/ 09189485601

GLOBE 0917 822 2361

LANDLINE 02 9665898

[agp]

Try mo muna i-check yung PCV valve baka barado na o baka palitin na.

[jick.cejoco]

kabitan mo na yan ng OBD para malaman kung may problema mga sensors... meron ba check engine light?

first, let's go back to the definition of OBD. it is, on board diagnostics, with, as of this writing, is either OBD I or OBD II. if you say kabitan ng OBD you probably meant - connect to a code reader or a diagnostic scan tool. it is a very colloquial term most people who don't have technical training and basing their theory on hearsay. please refrain from advising people who need help if you are not trained and familiar with these systems. it makes you look like madame auring erfelo.

[shelu]

though i dont know what OBD is, i've read and received advices from other sentra owners who experienced the same problem.. puro MAF talaga pinalitan nila.. common issue daw kasi talaga ng sentra ang sirain ang MAF.. exactly the same problem din kasi ang na-experience ko a couple of months ago bago ako nagpa-cleaning ng air intake related sensors ayun naayos naman for 2 months.. kaya baka kako yun ulit.. anyways, will try to have it cleaned again tapos pacheck ko rin yung mga nabanggit nyo dito.. salamat po ng marami.. god bless

hope ok na ang car mo sir. if you are really convinced na maf ang sira ng sasakyan mo sir, you can have it repaired. just check first the continuity. pag meron, hindi defective yan. pag wala, try mo nyo muna spray ng electronic contact cleaner, baka may alikabok lang. i have a nissan sentra 99 ex before. tama po yang observation ng nissan owners, sirain ang MAF. wag na wag nyo pong hawakan yong dalawang wires sa loob ng maf. kung may putol na wire sa loob, ipahinang nyo lang, ok na yan. sana makatulong.

[mojojojo]

Hi,

Anybody here got the same problem aside from OniLord and have fixed the issue with more than cleaning? I think I have the same problem. Have cleaned the throttle body already but not much improvement (not sure how clean is clean). My sentra 1999 SS has been working fine until the Habagat struck MM. A few weeks after the Habagat, my car's idling suddenly started to drop when in traffic specially when the engine is loaded (AC is on and in shifted on Drive). The idling suddenly drops like its about to stall (actually it did on several occasion) by itself or when you press on the accelarator. This only happens when the engine is hot already and more so when the weather is hotter (at night, its not as bad although the headlamps are an added load) and when in traffic or at the stop light when the engine is left to idle by itself. But during cold start or nakarekta na, there is no problem.

The diagnosis of the repair shop I sent my car to is also MAF sensor although my guess its not. It seems to be a general conclusion on Sentras. The MAF sensor of this model I was told, is part of the throttle body and to replace the MAF, you need to replace the whole throttle body of which the original is quite expensive (unless someone here can say otherwise)! Have been reading other threads on the net and I would like to consider their suggestions first before seriously considering to replace the throttle body which are 1) check the idle up valve/sensor 2) coolant/engine temp sensor 3) electrical connections.

By replacing the throttle body, its like all-in-one suntok sa buwan solution. You replace several sensors at the same time without knowing which one is faulty. The big "IF" is "IF" replacing the throttle body, the problem still persists, what now? I am not sure and I dont believe that the MAF is the culprit. I am now leaning more on the electrical connections on the sensors and the sensors related to temperature. If its the MAF, why does this problem only persist when the engine is hot? But which is it?? Car electronics make repairing more miserable

I would like to seek opinions from different users here in the forum, to shortlist the possible problems based on their experience. Does not matter if you're right or wrong. Will try to relate to your experience and try it on my car so any comments are very much welcome!