Ongoing change over valve issues on 991
#166
Not sure where you received this diagnosis, but I highly recommend a second opinion. I replaced 5 COVs, as it turned out, none of them needed to be replaced. This is the first place the PIWIS tells you to go. Find a mechanic who has successfully dealt with this issue, otherwise they will continue to throw parts and labor at it. Looks like you're in the Chicago area, try Ron Barnabas' shop in Batavia, ask for Mark.
#167
Instructor
Not sure where you received this diagnosis, but I highly recommend a second opinion. I replaced 5 COVs, as it turned out, none of them needed to be replaced. This is the first place the PIWIS tells you to go. Find a mechanic who has successfully dealt with this issue, otherwise they will continue to throw parts and labor at it. Looks like you're in the Chicago area, try Ron Barnabas' shop in Batavia, ask for Mark.
Porsche Dealer. All under warranty
Thanks for the recommendation though. Will need one once it is out of warranty.
#168
Instructor
Not sure where you received this diagnosis, but I highly recommend a second opinion. I replaced 5 COVs, as it turned out, none of them needed to be replaced. This is the first place the PIWIS tells you to go. Find a mechanic who has successfully dealt with this issue, otherwise they will continue to throw parts and labor at it. Looks like you're in the Chicago area, try Ron Barnabas' shop in Batavia, ask for Mark.
Mark from Napleton? I have dealt with him before with my Cayenne. We did not go well after they dropped a refurbished NAV and it went bad less than a year of install, draining my battery. Ended up pulling myself and installing aftermarket.
#169
Intermediate
Join Date: Oct 2016
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With the sheer amount of COVs that appear to have failed with so many cars, you would wonder if Porsche have ever thought of going in another direction and removing these completely with future engines. Surely this has got to be a real pain for them worldwide having to repair/refit, not to mention the sheer grief this has caused so many owners?
#170
Thanks to this thread my PSE is back in action. I had to use some small hands to get to the PSE COV. Ended up cutting off the vacuum lines since they were stuck on there good. I should have changed the rest while I was in there. The PSE COV looked fine visually, but my PSE would not activate. Now it works on demand as it should. The COV that controlled the sound symposer was melted ... I am not sure if I noticed much change on the sound symposer , I need to see if the previous owner blocked it off. Either way the COV was replaced with the F revision. I had C on my car (2014). I see service history for 1 fix for heater at 4K miles with the previous owner, not sure what revision that COV is that they likely replaced.
Fat and split COV. It looked melted.
Fat and split COV. It looked melted.
#172
RL Community Team
Rennlist Member
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vanlieremead (01-31-2021)
#174
Rennlist Member
I replaced my heater COV today with the new rev F unit. No bulging or swelling on the Rev B I replaced. Still no heat...
I moved the vacuum lines over and used the new adapter harness. I even checked the physical coolant valve canister and sucked on the hose to ensure it would open and close (which it did).
Before I changed it, the heater would work so long as you didn't adjust it... now I've got nothing. Anyone have ideas?
I moved the vacuum lines over and used the new adapter harness. I even checked the physical coolant valve canister and sucked on the hose to ensure it would open and close (which it did).
Before I changed it, the heater would work so long as you didn't adjust it... now I've got nothing. Anyone have ideas?
#176
I watched a yt vid about COV issues. The guy said that many issues stem from the PSE COV and replacing that was recommended. Are all COV the same part number? If so, what is the current part number?
#177
Rennlist Member
Another weird thing related is sometimes when driving 60-70 I get a high pitched squeal from the blower fan... It also pressurizes the cabin enough to nearly pop your ears. Very odd...
Last edited by menzzer37; 01-30-2021 at 06:15 PM.
#178
Hi there,
Are these also called 'Hydraulic Valves'?
I am looking at a vehicle history and they were replaced for 'Valve Lift' and 'Camshaft Controller' but I do not see them on this diagram.
Thanks in advance!
Are these also called 'Hydraulic Valves'?
I am looking at a vehicle history and they were replaced for 'Valve Lift' and 'Camshaft Controller' but I do not see them on this diagram.
Thanks in advance!
#179
Addict
Rennlist Member
Rennlist Member
I don't think so, the COVs are vacuum valves controlling ancillaries mostly, like exhaust, heater, stuff like that. Your stuff "hydraulic" sounds oil operated inside the motor.
#180