C70 S70 V70: - Knocking!!!

rooksy · Jul 7th, 2009, 12:05

Hi all,
Here's an interesting one!!!
I took my son to school yesterday, it was raining, and the roads where wet(obiviously) with a few puddles(not very deep).
I went through a puddle and then it sounded like the exhaust was blowing and knocking from under the car, felt like it was coming from the transmission tunnel with poor running and no power?
Any idea's, it lasted for about 15mins and then it was okay!

seriously confused!

rooksy

V70R awd

southportvolvo · Jul 7th, 2009, 16:36

Sounds like it's cleared itself, the only way to find it is to let it develop then a mechanic can diagnose the fault

rooksy · Jul 7th, 2009, 23:50

Hi,
Guess what!
happened again today about 3 times.
Each time the car went through a shallow puddle, the knocking developed, poor running and sounded like a tank, each time within about 5 minutes it cleared itself.
I even tried stopping and having a look, but couldn't see any water on the electrical stuff, got absolutley soaked, much to my son's amusement!

Rooksy

Jod T5 · Jul 8th, 2009, 09:42

Could be water upsetting the lambda sensor..
No sign of a dash light i assume?..

Jod

rooksy · Jul 8th, 2009, 10:37

Hi Jod,
no dash lights, I know that the lamba sensor is just under the turbo (I think), could it have a dodgy wire, so when the water splashes up and it shorts out until the heat from the exhaust dries it out.
Is this possible or not!
I 've never come across thsi before.
Cheers
rooksy

Jod T5 · Jul 8th, 2009, 10:48

Quote:

Originally Posted by rooksy

Hi Jod,
no dash lights, I know that the lamba sensor is just under the turbo (I think), could it have a dodgy wire, so when the water splashes up and it shorts out until the heat from the exhaust dries it out.
Is this possible or not!
I 've never come across thsi before.
Cheers
rooksy

Could well be..Sounds plausable...
You will need to jack the car up and check the two sensors, one before the cat and one in it....

Cheers
Jod

rooksy · Jul 8th, 2009, 20:00

Hi Jod,
Thanks for the info, as soon as I get Around to checking them, I'll let you know the outcome.
cheers again.
rooksy

Jul 7th, 2009, 12:05	#1
rooksy rooksy Last Online: Sep 11th, 2013 08:20 Join Date: May 2009 Location: dunstable View Photos By: rooksy	Knocking!!! Hi all, Here's an interesting one!!! I took my son to school yesterday, it was raining, and the roads where wet(obiviously) with a few puddles(not very deep). I went through a puddle and then it sounded like the exhaust was blowing and knocking from under the car, felt like it was coming from the transmission tunnel with poor running and no power? Any idea's, it lasted for about 15mins and then it was okay! seriously confused! rooksy V70R awd

Jul 7th, 2009, 16:36	#2
southportvolvo Trader Last Online: Nov 19th, 2021 13:18 Join Date: Jul 2007 Location: Southport/Merseyside	Could be anything! Sounds like it's cleared itself, the only way to find it is to let it develop then a mechanic can diagnose the fault

Jul 8th, 2009, 09:42	#4
Jod T5 Phoenix from the ashes Last Online: Apr 3rd, 2024 01:16 Join Date: Jan 2006 Location: Finchingfield	Could be water upsetting the lambda sensor.. No sign of a dash light i assume?.. Jod __________________ Dum Spiro Spero VOC 20419

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Jul 7th, 2009, 23:50	#3
rooksy rooksy Last Online: Sep 11th, 2013 08:20 Join Date: May 2009 Location: dunstable View Photos By: rooksy	Hi, Guess what! happened again today about 3 times. Each time the car went through a shallow puddle, the knocking developed, poor running and sounded like a tank, each time within about 5 minutes it cleared itself. I even tried stopping and having a look, but couldn't see any water on the electrical stuff, got absolutley soaked, much to my son's amusement! Rooksy

Jul 8th, 2009, 10:37	#5
rooksy rooksy Last Online: Sep 11th, 2013 08:20 Join Date: May 2009 Location: dunstable View Photos By: rooksy	Hi Jod, no dash lights, I know that the lamba sensor is just under the turbo (I think), could it have a dodgy wire, so when the water splashes up and it shorts out until the heat from the exhaust dries it out. Is this possible or not! I 've never come across thsi before. Cheers rooksy

Jul 8th, 2009, 20:00	#7
rooksy rooksy Last Online: Sep 11th, 2013 08:20 Join Date: May 2009 Location: dunstable View Photos By: rooksy	Hi Jod, Thanks for the info, as soon as I get Around to checking them, I'll let you know the outcome. cheers again. rooksy

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