Cleaning the throttle body... - Alfa Romeo Forum
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Cleaning the throttle body...

So I cleaned my throttle body yesterday using a can of QX7 throttle body cleaner. Got in it this morning and drove to work and got the infamous MCSF warning and noticed that the car is idle'ing at around 1,100 not the 850-900 it was before I cleaned the TB.
What have I done?
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just try the throttle reset to reset the idle. Also make sure you don't have air leaks due to removing the rubber connection to throttle body, or leak in the ribbed rubber piece, sometimes difficult to see.

throttle reset

- disconnect negative battery for aprox 15 minutes
- reconnect battery
- switch on ignition , leave for approx 90 seconds, without starting and without touching throttle pedal
( you should hear the stepper motor in throttle body searching end positions )
- switch off ignition, leave for approx 90 seconds still without touching throttle
- switch on and start, let idle for couple of minutes, without touching throttle
- go for drive
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Cheers for that, I have a silicon induction hose connected so I know its air tight, I'll try the reset though
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Cheers for that, I have a silicon induction hose connected so I know its air tight, I'll try the reset though
Reset hasn't worked unfortunately. I did move the butterfly whilst cleaning, like a fool! and I have read that doing that can really mess around with the calibration and is costly to put right, is this the case?
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Quote:
Originally Posted by jwq View Post
throttle reset
You don't need to do that:
Quote:
Originally Posted by jwq View Post
- disconnect negative battery for aprox 15 minutes
- reconnect battery
Only that is important:
Quote:
Originally Posted by jwq View Post
- switch on ignition , leave for approx 90 seconds, without starting and without touching throttle pedal
( you should hear the stepper motor in throttle body searching end positions )
- switch off ignition, leave for approx 90 seconds still without touching throttle
- switch on and start, let idle for couple of minutes, without touching throttle
- go for drive
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Quote:
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Reset hasn't worked unfortunately. I did move the butterfly whilst cleaning, like a fool! and I have read that doing that can really mess around with the calibration and is costly to put right, is this the case?
there's all kinds of horror stories, however cleaned mine moving butterfly numerous times without any problems what-so-ever......
I'd give the calibration another try.... Mind the instructions NOT to touch throttle pedal during the procedure.

Also make sure crank case breather etc. is correctly connected....

and you definately need the battery disconnect, otherwise it will not re-initialise.
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Thats reassuring! Surely it can't do that much damage right??
I'll try again, thanks fellas
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You should not, no.

You do need to disconnect the battery though.
Some say 15 minutes is enough, but I have always waited 45-60 minutes.

Remember to go for a good drive afterwards, including full throttle
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Remember to go for a good drive afterwards, including full throttle
Can't see that being a problem!
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So we have progress....the idle seems to have gone back to normal however I'm still getting the MCSF warning so under the impression something is still not right?
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You may have to clear the fault from the ECU using Multiscan or a code reader.
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Quote:
Originally Posted by Jam5k1 View Post
So we have progress....the idle seems to have gone back to normal however I'm still getting the MCSF warning so under the impression something is still not right?
Once an error is logged then the it needs to be cleared to turn the warning light off.

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I have had the MCSF errors before and never had to clear them electronically. They have always gone as soon as I've fixed the fault which leads me to believe something is still not right.....?
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Quote:
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I have had the MCSF errors before and never had to clear them electronically. They have always gone as soon as I've fixed the fault which leads me to believe something is still not right.....?
It depends on the fault in question and how long it's been present. Read the code (which it's reasonable to assume will be related to the throttle body) and then clear it, you should be fine after that. You may find some historic codes logged in there too. If you don't have a way to read/clear codes you can buy simple generic readers from Amazon etc for under £15, or buy cables for Multiscan for the same price and download their starter software for free .
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