Problem After Throttle Body Clean.

[Simplelife]

Hi guys

This is with regard my 1999 Ford laser. I did a throttle body and Injector clean through L*ugh*s service center on Saturday, but since then car is making a big humming noise from the air intake, it gets worse in high reves (similar to a lorry).

What could be the reason?

Pls advice.

Cheers.

[Davy]

You mean a hissing noise like an air leak? Does the car idle and drive normally?

If you can, try taking off the air intake ducts all the way upto the throttle body, so that it makes it easier to locate the source of the noise. If the noise can be heard only from the air intake opening, it might be something in the throttle body itself that is messed up.

[Simplelife]

  On 3/7/2016 at 7:09 AM, Davy said:

You mean a hissing noise like an air leak? Does the car idle and drive normally?

If you can, try taking off the air intake ducts all the way upto the throttle body, so that it makes it easier to locate the source of the noise. If the noise can be heard only from the air intake opening, it might be something in the throttle body itself that is messed up.

Yes Davy, exactly.. like a hissing noise..

The noise is very loud if i remove the air filter, but the engine stops immediately once i remove the intake ducts from the thorttle body. So couldn't figure out the exact culprit.

The RPM is not stable in Idle (varies between 700-1000) is as same and it drives normally...except for the loud noise.

Cheers.

[Davy]

The first step is to look for loose or disconnected vacuum lines around the throttle body and valve cover. Carefully look around and make sure all lines are secured properly. If you find at least one loose or disconnected line, that was probably it and your noise should go away once it's plugged back in.

If that's not the issue, get someone to start the car and step lightly on the throttle to prevent the engine from stalling (the car is stalling probably because the ECU is still learning), while you disconnect the air filter assembly. Once the air filter is out, you should be able to tell if the hissing sound is coming from inside the throttle body itself.

[Simplelife]

  On 3/7/2016 at 7:48 AM, Davy said:

The first step is to look for loose or disconnected vacuum lines around the throttle body and valve cover. Carefully look around and make sure all lines are secured properly. If you find at least one loose or disconnected line, that was probably it and your noise should go away once it's plugged back in.

If that's not the issue, get someone to start the car and step lightly on the throttle to prevent the engine from stalling (the car is stalling probably because the ECU is still learning), while you disconnect the air filter assembly. Once the air filter is out, you should be able to tell if the hissing sound is coming from inside the throttle body itself.

Thanks mate.. will do this and see today...

Cheers