1999 VW Lupo ECU Change
Discussion
Help !
The Background. . . . . 1999 petrol Lupo Sport 100BHP model.
My 165,000 mile lupo is not running very well at all when cold, The temp sensor has been changed, compression test done which shows 200 psi across all cylinders. When it is warm it runs fine, but it has failed its MOT on Emissions, probably the only VW that has
!
I have tried to read any faults via the OBD port without success, as have two other guys with different readers. the port seems open but none of the readers connect with the ECU.
The suggestion is that the ECU might be playing up, and as this is easy to get to, I have removed it as the part number was needed by VW to quote for a replacement or other sources of course However, is it a straight forward plug and play swap ? others have mentioned the imobiliser which I am not sure my car has.
The door locks have played up for a while which is a common Lupo issue, so I don't tend to lock it, which I guess activates the imobiliser, so with a new unit and not locking the doors should I be ok ?
Anyone got any experience on this ?
The Background. . . . . 1999 petrol Lupo Sport 100BHP model.
My 165,000 mile lupo is not running very well at all when cold, The temp sensor has been changed, compression test done which shows 200 psi across all cylinders. When it is warm it runs fine, but it has failed its MOT on Emissions, probably the only VW that has
!I have tried to read any faults via the OBD port without success, as have two other guys with different readers. the port seems open but none of the readers connect with the ECU.
The suggestion is that the ECU might be playing up, and as this is easy to get to, I have removed it as the part number was needed by VW to quote for a replacement or other sources of course
However, is it a straight forward plug and play swap ? others have mentioned the imobiliser which I am not sure my car has. The door locks have played up for a while which is a common Lupo issue, so I don't tend to lock it, which I guess activates the imobiliser, so with a new unit and not locking the doors should I be ok ?
Anyone got any experience on this ?
guys thanks for the replies
plugs, oil and air where all changed couple of thousand miles back. so I believe these are all good. I did check the gaps and all appears to be in order, bar the plugs being black which to me is over fuelling. The EML light has never come on, not sure if this is a bulb issue or a more significant.
My previous Lupo had a throttle body change when erratic running was the problem, and as this car runs so smoothly I don't think it is that.
I don't have the test results here with me at work, but from memory on the emission it only fails at idle, not general running. But I will hook these out and report back.
plugs, oil and air where all changed couple of thousand miles back. so I believe these are all good. I did check the gaps and all appears to be in order, bar the plugs being black which to me is over fuelling. The EML light has never come on, not sure if this is a bulb issue or a more significant.
My previous Lupo had a throttle body change when erratic running was the problem, and as this car runs so smoothly I don't think it is that.
I don't have the test results here with me at work, but from memory on the emission it only fails at idle, not general running. But I will hook these out and report back.
cheers for the replies
I have asked on club lupo. . .in short it was a suggestion on there to get the ECU tested as no one on the forums can understand why the OBD port to ECU seems to be down.
the temp sensor, was a green variety so replaced with the same from VW
the engine code is a ACK I believe according to VW parts guy checking against the chassis no.
The EML doesn't come on, I have owned the car for 4 years and it has never come on, perhaps a sneaky PO took the bulb out, that said I have never had any issues and it has always passed its MOT up until now.
I am favouring the 'get the ECU tested' anyone got any recommendations in this regard ? car is in Surrey.
I have asked on club lupo. . .in short it was a suggestion on there to get the ECU tested as no one on the forums can understand why the OBD port to ECU seems to be down.
the temp sensor, was a green variety so replaced with the same from VW
the engine code is a ACK I believe according to VW parts guy checking against the chassis no.
The EML doesn't come on, I have owned the car for 4 years and it has never come on, perhaps a sneaky PO took the bulb out, that said I have never had any issues and it has always passed its MOT up until now.
I am favouring the 'get the ECU tested' anyone got any recommendations in this regard ? car is in Surrey.
aka_kerrly said:
benters said:
the engine code is a ACK I believe according to VW parts guy checking against the chassis no.
.
Your engine code will be AFK - in less someone has fitted a 2.8 Passat V6.......
I still think the problem lies with the K-line wire which is essential for VAGCOM to work.
as before I appreciate everyones advice on this. I haven't yet sent the ECU off. The sensor that came out of the car that was working fine since my ownership was replaced with the same type the thinking being that it had always worked, so why change. For £3.95 its worth a go, so I will order and report back. My expectation is that it is one of two problems. The ECU not talking to the Port is not helping, but I have some time to check the wiring from one to the other this weekend, so lets see what I find !
I don't yet have a diagram, the ECU is totally disconnected (its in the Kitchen !) I was hoping to be able to test the port in situ. please feel free to offer a 'how to' do it ! I was hoping that a simple bulb test would be sufficient, but I take on board what you say about breaks, earths shorts etc.
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