Bad ISV?
06-18-2009, 03:25 PM
#1
Burning Brakes
Thread Starter
Bad ISV?
Are there any tell tale signs that the ISV has gone bad? I've been dealing with check engine lights and slight hesitation during take-off lately and it always goes away with an ISV cleaning. However, lately the check engine light has been coming on more often along with the hesitation and it's driving me nuts. I take the ISV out and clean it, and the car runs great again and the check engine light clears itself after driving around a bit. Couple hundred miles later, check engine light again along with some hesitation. Clean, and repeat. Going nuts.
I just cleaned the MAF as well and I don't suspect the MAF to be an issue. I can't seem to get my ISV 100% clean though...and I notice it's valve movement is kinda noisy when I'm cleaning it.
Do I need a new one?
By the way the check engine code is 1129 (if i remember correctly) - the one for the 02 sensors (which where already changed 30k miles ago).
I just cleaned the MAF as well and I don't suspect the MAF to be an issue. I can't seem to get my ISV 100% clean though...and I notice it's valve movement is kinda noisy when I'm cleaning it.
Do I need a new one?
By the way the check engine code is 1129 (if i remember correctly) - the one for the 02 sensors (which where already changed 30k miles ago).
Last edited by MrRoboto; 06-18-2009 at 08:15 PM.
06-18-2009, 04:23 PM
#2
Burning Brakes
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When I was buying all of the "while you're in there" bits and pieces for my top end rebuild, Steve Weiner suggested that I think about replacing the ISV (especially since I was going with a lightweight flywheel for my '95). Although keeping it clean is important, he told me that it will eventually fail. I decided to hold off on replacing it until now since I was experiencing symptoms of a clogged ISV more frequently.
The new ISV arrived from Sunset Porsche yesterday and I'll put it in this weekend. According to Jeff at Sunset, the remaining ISV's for sale are warehoused in Germany so it may take a while to come in. Cost for a replacement is now around $330.
The new ISV arrived from Sunset Porsche yesterday and I'll put it in this weekend. According to Jeff at Sunset, the remaining ISV's for sale are warehoused in Germany so it may take a while to come in. Cost for a replacement is now around $330.
06-18-2009, 04:39 PM
#4
Burning Brakes
Thread Starter
When I was buying all of the "while you're in there" bits and pieces for my top end rebuild, Steve Weiner suggested that I think about replacing the ISV (especially since I was going with a lightweight flywheel for my '95). Although keeping it clean is important, he told me that it will eventually fail. I decided to hold off on replacing it until now since I was experiencing symptoms of a clogged ISV more frequently.
The new ISV arrived from Sunset Porsche yesterday and I'll put it in this weekend. According to Jeff at Sunset, the remaining ISV's for sale are warehoused in Germany so it may take a while to come in. Cost for a replacement is now around $330.
The new ISV arrived from Sunset Porsche yesterday and I'll put it in this weekend. According to Jeff at Sunset, the remaining ISV's for sale are warehoused in Germany so it may take a while to come in. Cost for a replacement is now around $330.
Should I be able to observe the valve turning?
06-18-2009, 07:58 PM
#6
Rennlist Member
If you do need to purchase one, the best price (for now! stay tuned 
) will be here:
http://www.autohausaz.com/search/pro...ontrol%20Valve
Still $281... but same Bosch part Porsche sells, just not sourced through Porsche for $330
Sorry Jason...
) will be here: http://www.autohausaz.com/search/pro...ontrol%20Valve
Still $281... but same Bosch part Porsche sells, just not sourced through Porsche for $330
Sorry Jason...
06-18-2009, 08:17 PM
#7
Burning Brakes
Thread Starter
If you do need to purchase one, the best price (for now! stay tuned ) will be here:
http://www.autohausaz.com/search/pro...ontrol%20Valve
Still $281... but same Bosch part Porsche sells, just not sourced through Porsche for $330
Sorry Jason...
) will be here: http://www.autohausaz.com/search/pro...ontrol%20Valve
Still $281... but same Bosch part Porsche sells, just not sourced through Porsche for $330
Sorry Jason...
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06-18-2009, 09:07 PM
#8
Rennlist Member
06-18-2009, 11:04 PM
#10
just cleaned my ISV.when i took it out it was black inside and the valve didnt move.after spraying it with carb cleaner...i twist turn the valve and it moves...u will hear a clack clack clack sound.
06-19-2009, 03:06 PM
#13
Burning Brakes
Thread Starter
Cool thanks.
Yes, I've clean mine a few times, the problem now is I have to clean more often and I suspect the ISV has gone bad.
lol
Thanks, I'm pretty sure mine is failing as well. Did you get any check engine lights and if yes, do you remember the codes? Thanks.
Thanks, I'm pretty sure mine is failing as well. Did you get any check engine lights and if yes, do you remember the codes? Thanks.
