obekediamondfuto:


the point of controversy is the idea if vacuum and air intake. map measures vacuum inside intake manifold (after tps) and maf measures air Intake ( before tps).
note tps major role is opening sucking or allowing air inside intake manifold and closing.

now this setup doesn't have a maf just map that measures the pressure inside intake manifold with precision. maf would meter and measure the air being sucked in.

now with this ops issue of a broken or leaking AIR intake body I don't really see a lean code being thrown. all things being equal, tps et all. car would suck in the desired air and maintain absolute pressure in manifold and run normal albeit a little portion of the air being sucked in will be unfiltered (ops case as case study) pcv will be affected on the long run.

my two cents

GAZZUZZ:


not correct.

This is a 1998-2001 toyota camry with a 4cylinder 5s-fe engine

It employs the use of a manifold absolute pressure system for its primary regulation of air fuel ratio.

There is no Mass airflow meter in the design.





engine will suck up air that is not filtered.

The harmonics wil sound a little different.

The positive crank ventilation unit will loose a little efficiency.


Summary get a replacement.

obekediamondfuto:


the point of controversy is the idea if vacuum and air intake. map measures vacuum inside intake manifold (after tps) and maf measures air Intake ( before tps).
note tps major role is opening sucking or allowing air inside intake manifold and closing.

now this setup doesn't have a maf just map that measures the pressure inside intake manifold with precision. maf would meter and measure the air being sucked in.

now with this ops issue of a broken or leaking AIR intake body I don't really see a lean code being thrown. all things being equal, tps et all. car would suck in the desired air and maintain absolute pressure in manifold and run normal albeit a little portion of the air being sucked in will be unfiltered (ops case as case study) pcv will be affected on the long run.

my two cents

mayor2013:


Fuel consumption would be high. Still had a case at work this week. Torned intake air hose and had been patched previously customer came back after tuning up his engine. Found out the leak from the previous patched area by another engineer Prior to coming. When car is started in the morning it goes into limp home mode. Car came in back scanned ride and got a throttle actuator fault code. Said ride is a Honda Accord 2006

mayor2013:


How would the abosulte pressure be retained when there is already a leak?

GAZZUZZ:


MAF

mayor2013:


?

diportivo:
una just dey disturb the whole area since yesterday

Errmmm,op

all av agreed on u changing it so just go ahead and find it

contact me if u need help sourcing it

as for all these petrol heads arguing upandan,there's a landrover freelancer issue that I will post soon

una go argue tire

GAZZUZZ:


check my signature. 3 brands.....

diportivo:




even better

the engine of the freelander has been changed to 5s-fe

GAZZUZZ:


take

www.nairaland.com/attachments/5498553_image_jpeg9f360c5ab7736510df54c882e9dbf188

nams77:
Op are you still there? With all this inter- ballistic missiles flying around here hope eye no dey turn you?

honmusa:

No sir I disagree ,you can get a lean code .
watch

https://www.youtube.com/watch?v=Ino4x5QvKnQ

From the video u can see an evidence of vacuum leak and the engine managment system is still able to detect lean condition even wen the AFS is not even working.
So how come ?
The speed density fuel management system of a Camry 5s doest not only rely on only the map sensor data to supply the stoic equivalent amount of fuel injection for each amount of air ,It also takes data from TPS and other sensor.There is actually a preprogrammed algorithms inside the ecu that checks for all the sensors data to make a self diagnosis decision not based only the map sensor
And how vacuum leak can cause engine performance issue is that is air leak will introduce more air into the intake system which will not be compensated by the fuel injection needed to balance the tps angle opening causing less fuel and more air (lean )
Vacuum leak in camry 5s engine will cause poor performance issue ,high rpm at idle and high fuel consumption .
Practically,i have gotten many cases of camry 5S customer complaining of poor performance and high fuel consumption and the sole reason is cause of leaking air duct.
Although Maf will be more affected than speed density but that it will not be affected at all is a capital No
Finally ,the primary reason for map is not for fuel injection decision making only ,it also perform egr sensing

GAZZUZZ:


1 down 1 to go.

GAZZUZZ:


RR uses MAP and MAF at same time

nams77:
Op are you still there? With all this inter- ballistic missiles flying around here hope eye no dey turn you?

GAZZUZZ:


oya answer

LeJeun3:





Engine that can be used as generator.....

Any air is fresh air.....

Inception:

same with 2003-05 Honda accord (I4)

Pics or........

GAZZUZZ:


Pics or........

Inception:


Abeg no vex give me small origin make my eye clear

MAF sensor is on 2006- up Honda accord 4 cylinder engine (K24A8)

2003 to 2005 uses MAP + IAT ( Intake air temperature) sensor (K24A4)

chukel:
Mayor2013 and honmusa,u need to understand the concept of map and maF, what they measure and where they measure. Kudos to gazzuzz and obekediamondfuto

Deprofessional:
Does this broken hose have any negative effect on the engine?

Inception:


I Think they do.
the issue is the situation where either sensor performs below threshold.

MAP sensors due to its design purpose is usually located where the best amount of vacuum can be measured. this is why it is located very close to the intake manifold (in most cases, the throttle body). Like i said earlier, any leak before this point should not give problems. But leaks after this point will definitely cause engine performance issues. Therefore only leaks around the manifold gasket, throttle body gasket or the manifold itself (cracked manifold) should be suspected when such issues arise, not leaking hoses.

the MAF on the other hand measures volume of air, which is then stoicometrically compensated for via the required pulse with of the injectors, depending on the driving conditions. For it to be most effective, it is always located immediately after the Air filter box. This means that any air that goes into the engine after this point will be unaccounted for, giving rise to lean codes and whatnot.

Some cars use both systems e.g 2008 Honda accord 4 cylinder( Gazzuzz check your engine bay, i might be wrong).

In the OP's case, what he should be worried about is the quality of air going into the combustion chamber. It would definitely affect the MAP sensor, which will end up becoming dirty and may start giving false readings to the ECU. , causing engine performance problems...
This is aside the long term damage it might cause the engine.

chukel:
Mayor2013 and honmusa,u need to understand the concept of map and maF, what they measure and where they measure. Kudos to gazzuzz and obekediamondfuto

honmusa:

Can u explain why map was dropped in favour of maf in subsequent later model of Camry ,I want to learn from u .I am sure you are not born yet when I start to understand the concept of maf and map.
Too many small kids in car talk this days ,no wonder Siena left for goods.

sultaan:
I don't know anything but I know the oyinbo engineer eye design am put a duct with no holes in there for a reason and they clamped it tight so just defer to factory specs

Inception:



bros and all the while i think say u be oyinbo

honmusa:

Can u explain why map was dropped in favour of maf in subsequent later model of Camry ,I want to learn from u .I am sure you are not born yet when I start to understand the concept of maf and map.
Too many small kids in car talk this days ,no wonder Siena left for goods.
I just put up a video now to show that 5S engine can run lean even with map sensor to prove that concept of map sensor not responding to vacuum leak is not applicable in this case .So what else again u need to hear