itguy
Sunday 6th July 2008, 15:29
Hi Everyone
Need some opinions here please.
I've been getting a p1171 code set in my ecu for months now and sometimes it gets bad enough to bring the MIL/CEL light on the dash.
So time to investigate I thought. Readings are;
Long term fuel trim, 22% - short term upto 20% in addition when driving.
Idle mass throughput is 3.00 to 3.25 g/s at idle (660 rpm) with aircon off.
Now, from what I've read elsewhere it seems like the idle throughput is a bit low and that the MAF is just under-reading a bit. So, I bought a replacement from a company near Ikea, J26 of the M1. Brand-new bosch *copy* item, not genuine.
Fitted it, did an ECU reset (overnight with the battery off and via the OBD2 s/w) and it now idles poorly, fluctuating a bit, bogs when you first touch the throttle and it has also stalled a few times when pulling up to lights (my car is a geartronic btw). It does have a long term fuel trim of only -1.4% (after 100 miles).
Not good - car runs worse than before I changed it.
So I've now put back the first one (that one is a bosch) and it runs as it did before, 22% long term trim but idles and revs cleanly with no bogging.
What's the next step then?
1) Ideally I'd love to borrow a MAF from someone who knows it works fine and test it in my car (phase2, 2000 model year T5),
2) Return the new MAF for a refund and buy a genuine bosch one at twice the cost from partsforvolvosonline.co.uk
3) Return the new MAF and buy a used one from Salvo for about the same cost
4) Keep the new MAF, put it back in and hope the ECU learns to cope with the new way that it works (adaptations maybe?)
Is there something else I've missed totally? Lambda/EVAP etc?
Any help gratefully received.
Thanks
Need some opinions here please.
I've been getting a p1171 code set in my ecu for months now and sometimes it gets bad enough to bring the MIL/CEL light on the dash.
So time to investigate I thought. Readings are;
Long term fuel trim, 22% - short term upto 20% in addition when driving.
Idle mass throughput is 3.00 to 3.25 g/s at idle (660 rpm) with aircon off.
Now, from what I've read elsewhere it seems like the idle throughput is a bit low and that the MAF is just under-reading a bit. So, I bought a replacement from a company near Ikea, J26 of the M1. Brand-new bosch *copy* item, not genuine.
Fitted it, did an ECU reset (overnight with the battery off and via the OBD2 s/w) and it now idles poorly, fluctuating a bit, bogs when you first touch the throttle and it has also stalled a few times when pulling up to lights (my car is a geartronic btw). It does have a long term fuel trim of only -1.4% (after 100 miles).
Not good - car runs worse than before I changed it.
So I've now put back the first one (that one is a bosch) and it runs as it did before, 22% long term trim but idles and revs cleanly with no bogging.
What's the next step then?
1) Ideally I'd love to borrow a MAF from someone who knows it works fine and test it in my car (phase2, 2000 model year T5),
2) Return the new MAF for a refund and buy a genuine bosch one at twice the cost from partsforvolvosonline.co.uk
3) Return the new MAF and buy a used one from Salvo for about the same cost
4) Keep the new MAF, put it back in and hope the ECU learns to cope with the new way that it works (adaptations maybe?)
Is there something else I've missed totally? Lambda/EVAP etc?
Any help gratefully received.
Thanks