Lanos 1.3 - blocked air intake [solved]

Rodd1s · Post by **Rodd1s** » Sun Jan 11, 2009 5:28 pm

dont know where to start... the engine runs like a diesel.

bottom-end torque up to 2500 rpm is OK but there's absolutely no power above that. the symptoms are the same as if you were to drive only using half-throttle (eg: even at wide open throttle nothing more happens than if the throttle is at about half way open). there's a severe drop in power above 4500 rpm and by 5500 rpm the engine is basically life-less. there's a whistle coming from the engine (mostly likely from the the area around the intake manifold) from 3000 rpm upwards.

so far i've reset the ecu (by disconnecting battery for a minute etc). ive check that the throttle isnt physically restricted, eg: it opens fully when the pedal is pressed all the way down.

the vacuum gauge i installed several months ago tells me that even if i put my foot down the throttle is never fully open, (because at full throttle the vacuum gauge should go to 0 in.hg and stays 0 all the way thru the rev range), up to 1500 rpm it reads 2 in.hg, by 2500 rpm it reads 3 in.hg and by the time i hit 4000 rpm it reads 5 in.hg even with the throttle fully open.

tomorow im gonna take off the intake pipes etc to have a good look around the intake manifold or maybe try and get a look inside to see if maybe somehow something got in there and is restricting it.

other thoughts are that it may be something wrong with the MAP sensor.

another thing, the car's about 2 months overdue on service, (if that helps) but ive got that booked for the end of the month.

what i want to know is if anyone has any idea as to what can cause this kind of problem or where to start looking for problems, or how to test the various sensors etc, (cos i know some sensors can be tested with a multi-meter). any help/info/input appreciated.

[EDIT] forgot to add... theres no misfiring or rough idle at all. and it starts up fine. and there's no check engine light either. nor was there a check engine light before the ecu reset.

sheepdizildawg · Post by **sheepdizildawg** » Sun Jan 11, 2009 5:38 pm

sounds like what happened when my pre cat got fucked up. get under your front end and unscrew the O2 sensor and see if that helps anything. if so then check around somewhere in your exhaust.

Rodd1s · Post by **Rodd1s** » Sun Jan 11, 2009 5:44 pm

sheepdizildawg wrote:sounds like what happened when my pre cat got fucked up. get under your front end and unscrew the O2 sensor and see if that helps anything. if so then check around somewhere in your exhaust.

cheers, i'll be sure to check that aswell tomorow morning when i hav a look around it.

Rodd1s · Post by **Rodd1s** » Sun Jan 11, 2009 6:35 pm

ive just read through sheepdizildawg's "HELP PLEASE!!!" thread... im hoping my problem isnt as severe (shouldnt be cos mine still starts n runs) but if the engine's had it (ie: dead) then i think its time for an upgrade lol.

as far as i know the timing belt has never been changed on this car (only hit 31,000 miles this morning on the way to work)... any chance that timing belt slippage or slackness could be a cause of the problem?

im thinking the whistling could be from a blown headgasket, cos i'll be honest... i do drive the car as if it's indestructable at times.

[EDIT] anyone got any more info on O2 sensors and what they cause when they go wrong?

buddha102 · Post by **buddha102** » Sun Jan 11, 2009 7:00 pm

Rodd1s wrote:ive just read through sheepdizildawg's "HELP PLEASE!!!" thread... im hoping my problem isnt as severe (shouldnt be cos mine still starts n runs) but if the engine's had it (ie: dead) then i think its time for an upgrade lol.

as far as i know the timing belt has never been changed on this car (only hit 31,000 miles this morning on the way to work)... any chance that timing belt slippage or slackness could be a cause of the problem?

im thinking the whistling could be from a blown headgasket, cos i'll be honest... i do drive the car as if it's indestructable at times.

[EDIT] anyone got any more info on O2 sensors and what they cause when they go wrong?

whistle sound is usually from vacuum, check the hoses from intake manifold, u might have leakage of vacuum somewhere.

daewoomofo · Post by **daewoomofo** » Sun Jan 11, 2009 8:01 pm

o2 sensors just go, its like any other electrical peice time takes it tole on it

Rodd1s · Post by **Rodd1s** » Sun Jan 11, 2009 9:34 pm

just been out to speak to a few friends to see what they think... one's had similar problems when an airflow sensor wasnt functioning properly, but cant explain why there'd be the whistle sound. another thinks its the headgasket, but also thinks the airflow sensor is a possible problem.

i dont think the whistle is coming from vacuum lines, cos it only occurs at mid to high rpm. and a leak in a vacuum line would make it idle slightly higher than usual as can be found out by removing the little rubber plug/bung on the back of the intake manifold.

any other ideas?

[EDIT] what about the throttle position sensor? but then again, that doesnt explain the whistle.

Rodd1s · Post by **Rodd1s** » Sun Jan 11, 2009 10:14 pm

topics of interest with symptoms very similar to mine:

http://www.daewootech.com/forum/viewtopic.php?t=10846
http://www.daewootech.com/forum/viewtopic.php?t=10701
http://www.daewootech.com/forum/viewtopic.php?t=9776

one thing they all have in common... CATALYTIC CONVERTER! this really would not surprise me considering the amount of backfiring (and increase thereof) ive been having in the last 6 months.

Big Jeff · Post by **Big Jeff** » Mon Jan 12, 2009 2:36 am

sound like you have the same problem i had..

take your cat off. if it likke mine the shit inside has free it self and block the pipe.

all i did to solve this was blash the crap out of the cat in to a bag(careful not to bretit in very toxic), use a metal pole

MMamdouh · Post by **MMamdouh** » Mon Jan 12, 2009 9:56 am

so you are getting more vacuum when you step on the gas??... sounds like restricted intake system

did you try disconnecting the intake pipe and let the engine suck air right from the TB and see if the problem is solved?? if so then maybe you got clogged air filter or a big restriction in the intake piping... restricted intake passage will do that and will also cause the whistle

MMamdouh

Rodd1s · Post by **Rodd1s** » Mon Jan 12, 2009 12:45 pm

well... like i said i'll take off the intake piping etc as MM also suggested... and look what i found:

seems the end cap that closes the inner cone of the air filter lost its grip and got sucked in by the little 1300. luckily it didnt get past the throttle body due to being about the same size which is why the restriction was so bad.

still havnt taken the car for a spin though, so will find out later if its feelign better, which im sure it will.

cheers guys!

MMamdouh · Post by **MMamdouh** » Mon Jan 12, 2009 1:55 pm

LOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOL

the only reason i am laughing out loud is that the very same thing happened to me... the same piece fell off and got stuck in the rubber pipe in the exact same way... it is almost as having two throttle bodies with one partially open... God i am good

make sure to glue that part real good and also inspect the two metal rings on top and bottom of the filter as those fell off later on mine... glad you solved your problems bro.

MMamdouh

Rodd1s · Post by **Rodd1s** » Mon Jan 12, 2009 5:31 pm

the bigger metal ring fell off as i took the pvc pipe out that connected to the rubber intake pipe.

daewoomofo · Post by **daewoomofo** » Mon Jan 12, 2009 11:01 pm

MMamdouh wrote: God i am good

wholy arrogantness batman!

lol jk
glad it was an easy fix!

Rodd1s · Post by **Rodd1s** » Tue Jan 13, 2009 6:04 pm

daewoomofo wrote:...
glad it was an easy fix!

me too!! lol