Would my 1.4 8v (1997) engine have an Idle Stabilization Valve (ISV)...
I havent got access to a haynes manual sorry...
Idle Stabilization Valve (ISV)
Re: Idle Stabilization Valve (ISV)
Yeah its part of the throttle bodyStacey_K wrote:Would my 1.4 8v (1997) engine have an Idle Stabilization Valve (ISV)...
I havent got access to a haynes manual sorry...
Thanks for the quick reply. The reason i ask is that 'ross-tech' state that the Throttle body should be re-aligned if the the TB has been removed or the battery has been disconected (i have done both)...with the new TB i am still having idle issues (thankyou for everyones advice and suggestions) but so far no-one has been able to def pin-point the problem, as you can imagine i dont want to spend loads on parts i dont need...so im thinking of re-aligning the TB with a vag-com...
Does the above mean that a TBA, throttle body alignment, will not work because of the ISV, im sorry to keep bothing everyone, but this problem is starting to get on top of me....Thankyou for looking
-- Ross-Tech--In some vehicles, the car will not run correctly, or may not run at all without performing a TBA after one of the above operations. The TBA can be performed on both Drive-By-Wire (DBW or E-gas) as well as Cable-throttle cars as long as there is no Idle Stabilization Valve (ISV). If there is an ISV, then there is no motorized control of the throttle at all. Typically, '96-'99 VW/Audi have motorized Cable-throttle, and '00+ VW/Audi have DBW. Obviously, there are some exceptions. This should be obvious but TDI's do not have throttle bodies.
Does the above mean that a TBA, throttle body alignment, will not work because of the ISV, im sorry to keep bothing everyone, but this problem is starting to get on top of me....Thankyou for looking
Hi Stacey,
see you are still confused with aTBA.Phone Ilexa on 01726 884 010 and ask for Derrick (the guvnor).Tell him your car, what you have done and your symptons.I am sure he will be able to tell you what needs to be done to fix it.
As for an ISV, If polos in this country have them , then my daughters must have one,......Vag.Com worked on hers.
All the best....Ron H.
see you are still confused with aTBA.Phone Ilexa on 01726 884 010 and ask for Derrick (the guvnor).Tell him your car, what you have done and your symptons.I am sure he will be able to tell you what needs to be done to fix it.
As for an ISV, If polos in this country have them , then my daughters must have one,......Vag.Com worked on hers.
All the best....Ron H.
Thanks for all your help Ron.....really grateful. The main problem is ive been using the search function, trying to pin-point my next step, and even though the idle problem is very common there is loads of advice on how to fix it....could be loads of things (TB, alignment, temp switch, lambda sensor)
As i dont have lots of money (student) and dont intend to keep paying £35 a pop for a vag-com i was thinking of buying my own vag-com usb cable from ebay and using the free vag-com program available on the ross-tech site...just trying to gather more info before i waste anymore cash
As i dont have lots of money (student) and dont intend to keep paying £35 a pop for a vag-com i was thinking of buying my own vag-com usb cable from ebay and using the free vag-com program available on the ross-tech site...just trying to gather more info before i waste anymore cash
Stacey,
have been down that road.The free download from Ross-Tech is very basic I think.You may be able to read some fault codes but you will not be able to reprogramme the throttle body with it!.If it was that simple, Ross-Tech wouldn't make any money.A good scan with Vag.Com. possibly with the data coming from the engine whilst running should show up, and log, any faults to sensors, switches, even lambda performance.The readout should tell you what the problems are in code form.Decode the numbers and you should have your answer!.
Best of luck....Ron H.
have been down that road.The free download from Ross-Tech is very basic I think.You may be able to read some fault codes but you will not be able to reprogramme the throttle body with it!.If it was that simple, Ross-Tech wouldn't make any money.A good scan with Vag.Com. possibly with the data coming from the engine whilst running should show up, and log, any faults to sensors, switches, even lambda performance.The readout should tell you what the problems are in code form.Decode the numbers and you should have your answer!.
Best of luck....Ron H.
Whilst looking into VAG-COM, it was pointed out to me that on some Polos with MP9 ECU.s they might not take Basic TBA adaption from VAG-COM
without running a program to ERASE THE LONG TERM MEMORY from the ECU.This is a differant program, downloaded off the internet.It was pointed out to me that i might have needed to perform that process....i didn't!.
This proceedure is known to VW evidently, and they use it to cure MP9 ECU associated problems.
Hi again Ron,
well i got the cable off ebay after, the car still runs really bad at low throttle openings.... Running vag-com shows the following DTC:
00533 Idle Speed Regulator
After clearing the DTC it will re-appear everytime the engine is started...
My 'component' displayed within 'controller info' is a 'Motronic MP 9.0 2155'.
Can you please point me in the direction of the long term memory erasion program please you read about please, ill have a dig in on the web in a mo.
....Thanks again....
Just found the tool i need on the hex dianostics web site (ResetMP9 utility), quick question though:
Where's the cable to unplug the ecu??? (stupid question i know)6. After a few seconds the program will announce the end of the procedure. At this point, leave the ignition switched on and the ResetMP9 program still running.
7. Unplug the ECU while leaving the ignition switched ON!. Ensure that the plug will not make accidental contact with the ECU after it is unplugged.
8. Switch OFF the ignition, and wait for one minute.
9. Reconnect the ECU, ensuring that the plug seats firmly.
The ResetMP9 software states that it can be used to fix 533 related error codes, unfortunately my cheap ebay OBDII Plug cable is not supported....so does anyone know if there are anyprograms i can use with my OBDII cable to erase the long term ecu memory....sorry for all the hassle, just want to get her fixed and happy!!
Hi Stacey,
just saw your post.Firstly to unplug the ecu, you have to gain access to it under the panel in the engine compartment under the windscreen....near the windscreen motor. There is a large multiplug that goes into the side of the ecu.When i looked at mine i couldn't figure out how it was removed...there must be a special knack as to how to remove it.I didn't have to remove mine , so left it as it was!.
It seems you are using a cable off E-bay, and the downloaded free program.As I said earlier, you can read your fault.... 00533... but without the proper lead you cannot reset the ECU for TBA which is what you need to do.What is happening, is that you are reading the fault code 00533.When you click CLEAR THE FAULT CODES, what you are doing is clearing the faults off the screen of your computer,NOT off the ECU of the car.That is why the same fault reappears everytime...it is still in the ECU.
What they say do,is, FIND fault codes, LOG or PRINT off fault codes, CLEAR fault codes from screen, THEN perform TBA program.
I'm afraid with only the downloaded program and the lead without the dongle you will not get any further than you have.You now know the fault but you will not be able to reset the ecu back to Basic Settings.
Hope I have understood what you need to know and have helped you in some way....All the best......Ron H.
just saw your post.Firstly to unplug the ecu, you have to gain access to it under the panel in the engine compartment under the windscreen....near the windscreen motor. There is a large multiplug that goes into the side of the ecu.When i looked at mine i couldn't figure out how it was removed...there must be a special knack as to how to remove it.I didn't have to remove mine , so left it as it was!.
It seems you are using a cable off E-bay, and the downloaded free program.As I said earlier, you can read your fault.... 00533... but without the proper lead you cannot reset the ECU for TBA which is what you need to do.What is happening, is that you are reading the fault code 00533.When you click CLEAR THE FAULT CODES, what you are doing is clearing the faults off the screen of your computer,NOT off the ECU of the car.That is why the same fault reappears everytime...it is still in the ECU.
What they say do,is, FIND fault codes, LOG or PRINT off fault codes, CLEAR fault codes from screen, THEN perform TBA program.
I'm afraid with only the downloaded program and the lead without the dongle you will not get any further than you have.You now know the fault but you will not be able to reset the ecu back to Basic Settings.
Hope I have understood what you need to know and have helped you in some way....All the best......Ron H.
Yeah cheers Ron, i do understand, just not full of cash at mo...but i actually took her to a different tuning ecu garage last night...took alot more time and alot more helpful than the last guy.
He had the new vag-com with hex cable, cleared all codes, reset the TB, i was watching it re-align, but the faults kept re-appearing...the mechanic also commented that:
- car didnt sound like it was idling correctly
- could smell petrol
- maybe running a bit rich
He spent a good hour inspecting in the engine bay, sprayed something around the tb to check for leaks. In the end he couldn't fix it....
. But did comment that he believed a valve in the engine might be leaking (taken the head off!!)... Being a complete novice with little experience and dont really believe this to be the case, the car runs fine for first 2 miles, so i think is something electrical, we're off to buy a new temp switch this morning.....
He had the new vag-com with hex cable, cleared all codes, reset the TB, i was watching it re-align, but the faults kept re-appearing...the mechanic also commented that:
- car didnt sound like it was idling correctly
- could smell petrol
- maybe running a bit rich
He spent a good hour inspecting in the engine bay, sprayed something around the tb to check for leaks. In the end he couldn't fix it....
. But did comment that he believed a valve in the engine might be leaking (taken the head off!!)... Being a complete novice with little experience and dont really believe this to be the case, the car runs fine for first 2 miles, so i think is something electrical, we're off to buy a new temp switch this morning.....Stacey,
did the guy reset the long term memory.What I am lead to believe is that if you cannot reset to basic setting with Vag.Com....as you seem to be experiencing... ONLY THEN do you resort to Erasing the
Long Term Memory.It is a fix that Volkswagen do with that particular ECU, to overcomes a software glitch that they know exists.
Read the Reset MP9 from that website again.It mentions your fault code, so I personaly would carry that out first before spending money on sensors Etc.If it was a sensor problem I am sure you would be getting that registered as a fault along side the other one you have got.I think the basic idea of Vag.Com is to pinpoint any problems elecronically so as to take outthe hit and miss approach of many "mechanics" who will gladly keep changing parts until they get to the problem....at your expense!. .Just a thought!
All the best ...Ron H.
(I am out now till later, let me know what you think).
did the guy reset the long term memory.What I am lead to believe is that if you cannot reset to basic setting with Vag.Com....as you seem to be experiencing... ONLY THEN do you resort to Erasing the
Long Term Memory.It is a fix that Volkswagen do with that particular ECU, to overcomes a software glitch that they know exists.
Read the Reset MP9 from that website again.It mentions your fault code, so I personaly would carry that out first before spending money on sensors Etc.If it was a sensor problem I am sure you would be getting that registered as a fault along side the other one you have got.I think the basic idea of Vag.Com is to pinpoint any problems elecronically so as to take outthe hit and miss approach of many "mechanics" who will gladly keep changing parts until they get to the problem....at your expense!. .Just a thought!
All the best ...Ron H.
(I am out now till later, let me know what you think).
I menthoned the MP9 issues to the mechanic, he assured me that his newer version of vag-com would be able to work ansd wouldnt have problems with thelong term memory...
When a friend with a registered version of vag-com 409.1 switched to basic settings nothing happend, no ADP RUN was displayed or noise from TB...
When the mechanic ran vag-com yesterday i could actually his version displayed ADP RUN and i could actuallly hear and see the TB moving in engine... He didnt seem to think the TB is the cause, so now we're back to sqaure 1.....
Also i found the follow info page on 533, my error code, now i got to sit down and try to understand it.....Thanks Ron, soz for constantly frustrating you
When a friend with a registered version of vag-com 409.1 switched to basic settings nothing happend, no ADP RUN was displayed or noise from TB...
When the mechanic ran vag-com yesterday i could actually his version displayed ADP RUN and i could actuallly hear and see the TB moving in engine... He didnt seem to think the TB is the cause, so now we're back to sqaure 1.....
Also i found the follow info page on 533, my error code, now i got to sit down and try to understand it.....Thanks Ron, soz for constantly frustrating you
Good News!!!! The car is fixed!!!! 
Changed the temp switch this morning, cost £10. Just been out for a LONG drive purposly sampling different types of roads and speeds....the car runs fine now.
I would like to thank everyone for their help and suggestions (especially RH for his time and assistance)...
Next up - clean her...then i'll post some more pics...
Thankyou (much relived) Stacey & Owen
-- -- -- --
Also if anyone needs a Throttle Body, i got my cleaned up old one going for cheap ...
Changed the temp switch this morning, cost £10. Just been out for a LONG drive purposly sampling different types of roads and speeds....the car runs fine now.
I would like to thank everyone for their help and suggestions (especially RH for his time and assistance)...
Next up - clean her...then i'll post some more pics...
Thankyou (much relived) Stacey & Owen
-- -- -- --
Also if anyone needs a Throttle Body, i got my cleaned up old one going for cheap ...
