Car Diagnosis

[monsh]

Hi all,

Im using AE101 4a-fe manual .
seems like the fuel consumption is very bad .
was told by a fellow forumer that it is best to send the car for diagnosis .
something like plug in cable to the car ECU or something to check what the ECU signalling and all .

so my question is where can i do it for my engine ? this is just a standard not BT, SVT or something .

and where can i go for retuning ? cause im getting crappy FC here .

340km for RM80 ron95 .

and how much would these 2 services cost?

thanks in advance .

 

[huakenny]

any check engine light ON?

hv u go thru a proper maintenance job yet? if not, plz do so

 

[cuscostrutbrace]

If no check light means system ok,u just go service,change wear and tear parts,fuel filler caps and old hoses can cause high fuel consumption also...

 

[nappx]

rarely heard old hoses can cause high fc..mind to share..

 

[cuscostrutbrace]

Old cracked hoses can cause petrol to seep through,as well as old filler caps,where the rubber not sealing tight enough

 

[monsh]

nope .
no check engine light .
just wanna check bcos who knows if some of the sensor is dead or something .
just for diagnostic to know the car condition .

and yes, i do take care of the car, everything seems okay except for the fuel consumption .

i dont feel sluggish power, power lost or anything . its all good .

i do feel like my exhaust pipe system have leaking cause i hear roaring sound during low end rev .

never changed the o2 sensor for more than 15 years (i believe) and never changed the piping system(this confirmed) .

and also, what does retune means ?
some fellow forumer said it's tuning the ignition and camshaft timing .

mind to share guys ?

---------- Post added at 03:38 PM ---------- 6 hour anti-bump limit - Previous post was at 03:14 PM ----------

for the hoses, seems to be ok .
dont see any leakage at the fuel rail or any other hoses .
all looks good not wet or anything .

 

[cuscostrutbrace]

change o2 sensor then

 

[monsh]

i'd prefer if i do the diagnosis first to know if there's any other problem with the car .
cant complain much cause its 17 years old and it works flawlessly .
just the FC is too bad .

and im trying to see if there's anything problem with the sensors and the electronic part of the car .

that's y im trying to find out which garage do the diagnosis and also tuning part. and how much it cost .

i'm just a newbie in the automotive world . just wanna get to know the car system better ^^,

 

[huakenny]

ask ur mech to diagnose for u...should be rm80(around)

do a proper checkpoint and maintenance jobs.....it will restore back the power. check if ekzos system got leak o not(gotta jack up the car) vacuum hose got crack/leak o not, spark plug condition, engine oil grade, transmission fluid(at/mt), air filter condition etc

some members love to remove the negative battery terminal and leave it for 15minutes or more and put it back....let the ecu refresh....

i tried on my cars n it works for certain shits than my diagnostic scan tool cant solve.... lolz

 

[monsh]

that only resets the ECU .
im gonna go for diagnostic later on .
but not sure where to do it .
so where's the place to do it in KL ?
any suggestion ?

 

[Veloc]

Agree with bro huakenny... I did mine for RM80 in kk sabah. Truly, my previous problem was my O2 sensor. This is a famous cause for poor FC in old cars... Before I change, I got around 300 km for RM70. After change, I got 350 km.

Anyone can recommend a place in kl for this bro? Kegani specialised in 4AGE right? Can they diagnose 4AFE anyways?

---------- Post added at 08:28 PM ---------- 6 hour anti-bump limit - Previous post was at 08:25 PM ----------

Beo you can also ask around any automotive electrical shops. Some have the device... Last time I used "Launch" brand.

If really can't find, go back UMW. But they charge higher la...

 

[p3jal]

ehh..can i know..how to know the o2 sensor kong? if kong fc become higher then normal>?

 

[monsh]

yes bcos the sensor report wrong information to the ECU .
so ecu inject more fuel to compensate for the lost .
something like that .

 

[Veloc]

O2 sensor/oxygen sensor/lambda sensor, basically sense the amount of oxygen in your exhaust.

If it detects excess oxygen, means to little fuel. So it signals the ECU to enrich the fuel.

If it detects too little oxygen, means that mixture is too rich. So it signals the ECU to turn it lean.

So it basically keeps your fuel mixture balance (stoich).

Normally after 10 years of so, it will give way. If it can't send any signal to the ECU anymore, the ECU will automatically tune the fuel mixture to "rich" for safety.

 

[monsh]

and i think the sensor work with the MAF sensor or something isn't it ? the airflow sensor on the air intake also play roles in the determination of fuel injection system .

 

[Veloc]

4AFE uses MAP sensor. Not MAF.

Anyways, your symptom of high FC is most probably due to O2 sensor. Because MAP sensor detects the manifold pressure and determines how much fuel to inject BASED ON the air-fuel ratio set by ECU. ECU sets this BASED on O2 sensor. MAP sensor does not control the air-fuel ratio. So it still boils down to O2 sensor.

If MAP sensor kong, you will get unstable idling, reluctant to rev high and unstable revs. Not high FC.

 

[lkeong88]

If I remember correctly, ae101 in Malaysia don't come with any o2 sensors

 

[monsh]

thanks for reminding mr lkeong88 .
again fulat, where is the location of the o2 sensor ?
i tried finding and like mr lkeong said, i couldn't find it .

possibly below the exhaust header cover ?
and how much does this o2 sensor cost ?

---------- Post added at 09:45 AM ---------- 6 hour anti-bump limit - Previous post was at 09:40 AM ----------

take a look at this page .
mine is 94 ae101 local made

http://www.zerotohundred.com/newforums/toyota/291325-4a-fe-o2-sensor-2.html
http://forum.autoworld.com.my/index.php?showtopic=73071

 

[Veloc]

If I remember correctly, ae101 in Malaysia don't come with any o2 sensors

How can EFI cars function without O2 sensor? How to regulate fuel? I just did mine AE111 last year. And since 101 and 111 uses same engine (2nd gen 4AFE), then sure got la...

thanks for reminding mr lkeong88 .
again fulat, where is the location of the o2 sensor ?
i tried finding and like mr lkeong said, i couldn't find it .

possibly below the exhaust header cover ?
and how much does this o2 sensor cost ?

Bro I told u before in detail... I got quote from UMW 700+. In the end, I bought myvi O2 sensor (RM200+) and mod to fit my car. Works perfectly. Mounting no prob u can mod to fit. But make sure the number of wire. Mine is 4 wire. 1 white, 1 blue, 2 black. Only if wires same, the electrical socket of the sensor can fit.

As for the location, 4AFE's O2 sensor is quite far down. You can't find it in the engine bay like other cars. Jack up you cars and lok underneath. It is just before the catalytic converter. Sure you can see it bro... But you need jack or hoist your car up.

---------- Post added at 10:50 AM ---------- 6 hour anti-bump limit - Previous post was at 10:47 AM ----------

As the person said, his mech can't find O2 sensor, this is because most new cars have the IO2 sensor in the exhaust manifold/header. It's visible in engine bay. 4AFE's one is not at header. But further down at the downpipe. Maybe the mech is ayam mati mech la. Trust me la... Give you so much details dy... Just go do it...

1. Jack up your car and you can see the O2 sensor.
2,. GO diagnosis.

 

[monsh]

still finding a place in KL which can do the diagnosis .
chill man, not saying you're a cheater or something .
its just that i couldnt see it from the engine bay and when i duck i couldnt find anything bottom there .

and like the guy said in the link i provided, there's no cat con i think .
due to the fact that malaysia doesn't follow the emmision regulation strictly .
open loop fuel system or something .

and ae111 model does come with the o2 sensor .

anyway, im still gonna check to reconfirm .
sick of this high FC .

its gotta be that and the piping .
my engine used to go overheat, and damaged the gasket .
so im guessing there's carbon deposit and stuffs in the piping .
i can even hear a bit strong roaring sound during low rev .

so im guessing the pipe is leaking somewhere .
i do plan to do full piping from header till muffler tip .

and trying to source out for a 4-2-1 header now T_T seems like its hard to get for this model .