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Old 09-02-2006   #1
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can u clean a map sensor?

hi everybody...i would just like to know can you clean the map sensor...ive already know where it is positioned..it is in black box on left top side of engine bay..am i right?..i would like to know can you clean it by yourself..or you need some profesional help...and is it to hard to do it, can you make some problems to engine if you touch it..i have 1.6 16v brava...thanx
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Old 09-02-2006   #2
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Re: can u clean a map sensor?

Why do you want to clean it? You can wipe it clean but its a pressure sensor afterall.
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Old 10-02-2006   #3
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Re: can u clean a map sensor?

i want to clean it because i have problem with car performance..i dont know the reason why is that so..i already cleaned the idle control valve, put in some injector cleaner, the spark plugs are ok, the cables of plugs are also ok..i have this problem for half a year now...the problem is in hesitation when the car is cold..and that happens less when the car is warm..it happens in lower gears..in high revs the car is running smoothly...i think the problem is in fuel air mixture..so what can be the problem..i am now thinking in map sensor or throttle position sensor..am i right?..i just want to see with you before i go on diagnostics..but i dont think that diagnostics will show anything..i also cleaned the lamda sensor but nothing..if anybody have some ideas i would be gratefull..
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Old 10-02-2006   #4
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Re: can u clean a map sensor?

The readings from the lambda sensor are ignored when the engine is cold so it won't be that.

Is your air filter clean?
Are you getting any warning llights?

Reset the ECU so it can re learn the best settings

Does the engine just die a little on acceleration or is it a big and dramatic misfire?
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Old 10-02-2006   #5
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Re: can u clean a map sensor?

thanks for answering deckchair..Ive changed the air filter recently...everything about the spare parts is new..the fuel filter is changed too..i red somewhere on this forum that the best spark plugs for brava or bravo engine are NGK...when i changed the plugs i put on the BOSCH one..normally it is the same type of plugs..but the problem was still there..so Ive put on back the old NGK..my question is should i buy and put new NGK spark plugs...and does it really matters if the new plugs are not NGK...some people on this site say the car wont run good if it is another type of manufacturer...and once again is it hard to clean TPS and where can i found the oxygen sensor and how to clean it?..thanks...
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Old 10-02-2006   #6
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Re: can u clean a map sensor?

The air filter is clean- good

The oxygen sensor will not be the cause of your problem as it isn't used when the engine is cold

Type of spark plug won't make much difference to your hesitation problem unless they are worn out or not working. If they are quite new then that is fine

Reset the ECU by disconnecting the battery and leave it over night.

Then the ECU will learn again the best settings for your car

Tell us what happens
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Last edited by Deckchair5; 10-02-2006 at 23:36.
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Old 11-02-2006   #7
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Re: can u clean a map sensor?

I already can call you a friend...so my dear friend, I already did that..many times and nothing happened..i dont mean that hesitation is happening only when the car is cold..it sometimes happens when is hot...i can feel it in first gear..car is accelerating slowly..then something happens and car is flying..all that happens in first gear..mostly..in second gear too..like its getting fuel on stroke..doesnt matter if it is warm or cold...but this more happens when the car is colder..so I am thinking that this could be something with air fuel mixture..I disrule the injectors..than the car wuold run poorly in all gears...so i thought about TPS or oxygen sensor...i dont know what to do..i spend all my ideas..so when i got some money it will go on diagnostics for sure..
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Old 11-02-2006   #8
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Re: can u clean a map sensor?

Sounds like the map sensor or lambda sensor to me, do you get any warning lights on the dash at all?
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Old 11-02-2006   #9
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Re: can u clean a map sensor?

no i do not get any warning lights on dashboard..everything else is ok..the car starts normally even on very cold temperatures..so can you clean a map sensor..and is it hard to do it...
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Old 11-02-2006   #10
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Re: can u clean a map sensor?

Lambda sensor isn't in the circuit when engine is cold and is ignored by the ECU until it gets hot. If you have big hesitation with engine cold it won't be the lambda sensor

ENGINE TEMPERATURE SENSOR
symptoms of poor starting, hestation, poor fuel economy

LAMBDA SENSOR
once engine is warm, symptoms are hesitation when accelerating, very poor fuel economy, possible stalling when coming to a stop

MAP SENSOR
hesitation on acceleration, poor economy

Very similar aren't they

Cleaning the MAP sensor won't do any good. It senses pressure so it either works or it doesn't. Not much you can do to it

Do you know anyone who can scan your ECU for fault codes?
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Old 12-02-2006   #11
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Re: can u clean a map sensor?

yes they are very similar indeed...i will try to find somebody but if i dont find anybody i will go on diagnostics...when i bought the car i did go on diagnostics and it was fine...can diagnostics find any mistake and erase it on the ECU?..because i remeber i had some mistake about code and guys in shop erased it..very tricky problem i have with my car..there is no solution
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Old 12-02-2006   #12
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Re: can u clean a map sensor?

Oh there's a solution but it can take a long time to find with trial and error.
I had big hesitation at exactly 2000rpm every time on my 1.2 Bravo that was very unpleasant.
I changed air filter,plugs, plug leads, oxygen sensor, cleaned inlet control valve, reset ECU and it runs really sweet now.

I think cleaning the inlet control valve had the biggest effect but a diagnostics check will be quickest to give you the best clues as to what is wrong

The fault codes will be a like a history record of what it noticed was wrong at any time. Some of the recorded faults may be only momentary and have cured themselves, others you'll see appearing more frequently showing a definite problem area.
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Old 12-02-2006   #13
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Question Re: can u clean a map sensor?

Quote Originally Posted by Deckchair5
The air filter is clean- good

The oxygen sensor will not be the cause of your problem as it isn't used when the engine is cold

Type of spark plug won't make much difference to your hesitation problem unless they are worn out or not working. If they are quite new then that is fine

Reset the ECU by disconnecting the battery and leave it over night.

Then the ECU will learn again the best settings for your car

Tell us what happens
Hello Deckchair, you say that ,my neighbour can reset the ECU, my question is: That really works? Is that dangerous?
I've read about that on fiatboo and I thought that it is not possible! And if you step on it after the reset, will it spend more petrol in the future? It's twitching and I think if this reseting is true, it will maybe solve that problem.
Sorry about my knowledge in english terms in car work. I'm studying english but I'm poor in terms about cars and it's reapirs.
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Old 12-02-2006   #14
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Re: can u clean a map sensor?

reseting the ECU just makes the ECU go back to its factory basics.
from there the ECU then learns the settings that suit the engine. in some situations it can clear problems.
no harm in trying though

oh yeah the engine may seem a bit out of tune for the 1st 100 miles or so until it learns
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Old 12-02-2006   #15
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Wink Re: can u clean a map sensor?

Thanks custard for quick answer! I hope it will solve the problem because it is irritating when it's twitching Thanks! PEACE!
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