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Author Topic: Symptoms of a knackered MAF sensor  (Read 16318 times)

Saintsteve

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Re: Symptoms of a knackered MAF sensor
« Reply #15 on: February 27, 2013, 07:34:21 pm »
If You Can blow and Suck down that Value then it is Faulty. :happy2:
I just tried my pcv again and can blow and suck down the pipe with ease

Then it is Faulty fella :happy2:

northyracing

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Re: Symptoms of a knackered MAF sensor
« Reply #16 on: February 27, 2013, 07:45:09 pm »
I am glad you said it's faulty as I ordered all the parts and was said it could be the maf. So hopefully this will make the car a plesure to drive again  :happy2:with no hesitation

northyracing

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Re: Symptoms of a knackered MAF sensor
« Reply #17 on: March 07, 2013, 08:37:05 pm »
replacde the pcv and still gets the juddery feel at idle so dont know what to do now

Saintsteve

  • Guest
Re: Symptoms of a knackered MAF sensor
« Reply #18 on: March 07, 2013, 09:28:25 pm »
replacde the pcv and still gets the juddery feel at idle so dont know what to do now

If you haven't already..go for a drive

northyracing

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Re: Symptoms of a knackered MAF sensor
« Reply #19 on: March 08, 2013, 06:56:32 pm »
right i had my car plugged in today to find no faults what so ever not even a missfire everything working as it should but im still getting this annoying idle cant work it out and dont know what route to take now

Offline ROH ECHT

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Re: Symptoms of a knackered MAF sensor
« Reply #20 on: July 17, 2021, 05:51:56 pm »
In reading this old topic today, I noticed a few things.
That is; blowing into the intake-to-manifold tube only tests one of three valves inside the PCV. It tests if one of the PCV valves contains boost when present. If you can blow through it, then you lose boost. The other two are what seal the crankcase when in vacuum. The diaphragm and recycle valve are shut to apply the vacuum to the crankcase. If they do not seal, then vacuum applied by the intake manifold will suck air through the PCV from the turbo inlet. Testing it requires blowing into both the intake side valve and the recycle to turbo inlet valve...both should seal. Then the diaphragm must be removed and inspected. You can check if vacuum is strong with the oil filler cap removed or the dipstick removed, but you do not know the level of vacuum without a gauge. Or, use a gauge to check the vacuum. If vacuum level is normal, the the PCV is working fine in vacuum mode.
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