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Nissan primera p12 lack of power no fault code

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paulsx View Drop Down
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    Posted: 04 Jan 2019 at 8:49pm
Sorry now re-read rules hopefully this title is ok. My p12 1.8 has over last two days developed a complete lack of power and wont rev to more than 2.5k. It just started doing this without warning then it cleared and was ok. Now it's like it all the time, I've checked there are no fault code stored but it feels like it's a default mode or something similar. I suspected the airflow meter so unplugged it and the car ran better but still not above 2.5k. The unplugging threw up a fault code that now won't clear which makes me suspect the meter or wiring. Has anyone had any similar problems? Many thanks paul
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p11primeragt View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote p11primeragt Quote  Post ReplyReply Direct Link To This Post Posted: 04 Jan 2019 at 9:16pm
It's the Maf sensor.

Only replace it with a oem maf ,cheap ones don't work properly.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote paulsx Quote  Post ReplyReply Direct Link To This Post Posted: 04 Jan 2019 at 9:26pm
Cheers that's what I thought got a good used one coming so will try that many thanks
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imckay View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote imckay Quote  Post ReplyReply Direct Link To This Post Posted: 05 Jan 2019 at 9:28am
Welcome (back) to NPOC

If not the MAF, it could be a collapsing CAT or Silencer.
Very weird one we have seen a couple of times is the Cover from the back of the Headlight falling off and blocking the Air Intake.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote p11primeragt Quote  Post ReplyReply Direct Link To This Post Posted: 05 Jan 2019 at 4:09pm
Collapsing cat/silencer would not effect how the engine revs or lack power,a blocked one would though.

On the p12 you would get a cat below efficiently code if it was collapsed and it would maybe rattle if left long enough due to the core breaking up.

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paulsx View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote paulsx Quote  Post ReplyReply Direct Link To This Post Posted: 07 Jan 2019 at 12:18pm
I am pretty sure its not the cat as the car did run properly for about 20mins over the weekend lol. I will change the maf when it arrives and see but it definately feels more airflow/ fuel restriction related
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Post Options Post Options   Thanks (0) Thanks(0)   Quote paulsx Quote  Post ReplyReply Direct Link To This Post Posted: 09 Jan 2019 at 7:49pm
Ok update on this changed maf sensor car is running slightly better but not much. Then turned off the lights and car picked up and ran properly until you turn them back on. Assuming it's a rear light earthhing problem now? Do ypu need new earth for both rear lights to fix it?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote imckay Quote  Post ReplyReply Direct Link To This Post Posted: 09 Jan 2019 at 8:22pm
Just the one side required. No harm in doing both though.
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