running badly
- Thread starter nickyt8
- Start date
it seem to start after fitting a super chip fitted, not sure if caused problem,removed chip, with original problem still there, local garage ,not porsche related,did sevice,dont think its the chip but you never no, emailed chip providers, they said they have had no problems before,pain driving at minnit,is it just amatter of elimanation,nick
AndrewS
Member
Hi Nick,
A chip will not be the cause of your problem, however - the disturbed items as a result of its fitment could be. This would only include the ECU, hence you may want to eliminate that first and check the multi way connector has been firmly refitted and that the ECU was secured back in the frame (passenger footwell on RHD car).
The ISV is controlled by the Motronic ECU and is operated in accordance with signals received by the ECU (such as the cold start sender and AFM signal).
Your problem could be the ISV, but as your idle is fluctuating, it suggests the ISV is operating (although it may be sticking internally). A test meter is required to test the ECU and ensure the ISV is getting the correct signal. The ISV is hard to get to (as it is under the manifold).
So, my first suggestion would be to check the AFM connector first. Remove, wipe dry and spray with contact cleaner. Refit and try. Best to start with the easy to check things first.
Regards,
Andrew
A chip will not be the cause of your problem, however - the disturbed items as a result of its fitment could be. This would only include the ECU, hence you may want to eliminate that first and check the multi way connector has been firmly refitted and that the ECU was secured back in the frame (passenger footwell on RHD car).
The ISV is controlled by the Motronic ECU and is operated in accordance with signals received by the ECU (such as the cold start sender and AFM signal).
Your problem could be the ISV, but as your idle is fluctuating, it suggests the ISV is operating (although it may be sticking internally). A test meter is required to test the ECU and ensure the ISV is getting the correct signal. The ISV is hard to get to (as it is under the manifold).
So, my first suggestion would be to check the AFM connector first. Remove, wipe dry and spray with contact cleaner. Refit and try. Best to start with the easy to check things first.
Regards,
Andrew
As Andrew has said the ISV is under the inlet manifold. No harm in doing as he suggests first, but when I had exactly the same symptoms cleaning the ISV resolved them.
It's a bit tricky to get to, but it can be done without removing anything else. It's a while since I had an S2, never mind cleaned the ISV, but from memory it's held on with 2 hex-head screws and it's visible between 2 of the intake runners; either 1&2 or 2&3. Once you get it out you need to make sure the cylinder inside is free to turn by cleaning off the varnish that will have built up using carb cleaner.
It's a bit tricky to get to, but it can be done without removing anything else. It's a while since I had an S2, never mind cleaned the ISV, but from memory it's held on with 2 hex-head screws and it's visible between 2 of the intake runners; either 1&2 or 2&3. Once you get it out you need to make sure the cylinder inside is free to turn by cleaning off the varnish that will have built up using carb cleaner.
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