I have a punto evo multijet 1.3 85 hp with 280,000 km, almost all of which have been done on trips. I recently changed the injectors with new BOSCH ones and repaired the pump because it was struggling to start. The car before this change was fine, it just wouldn't start when it was hot, now it starts. Now I have a problem with the car, when it reaches a temperature of about 70 degrees and above, it cuts out and doesn't go any further for about 3-4 km and then it stalls on its own and if it stalls it never does it again until the next time I start it cold. There is no fault light anywhere. The injectors came out again, were measured again, coded again, were passed through the brain normally, we went out and drove around with the diagnostic connected and Bosch told me that from their side everything is integration from injector and pump and the values in the diagnostic are very good both at idle and at full throttle. Only the MAF they told me that it should go up at full throttle 80-90 g/s while mine was going up to 55 g/s. On the occasion of the MAF prices, a genuine BOSCH one was bought and put in in case the problem was fixed, and the same thing happened. A second genuine MAF was bought and the same thing happened again. The genuine MAP was also changed and the same thing happened again, then we went to EGR which did not seem dirty but a new genuine one was put in and the same thing happened again. No fault lights anywhere. The second MAF was purchased because the first one was considered defective, after measuring the signal it sends to the ECU with a multimeter and the volts did not increase as the rpm increased. The problem is that in all 3 genuine MAFs the volts should increase gradually from 1.5 volts to 4-5 volts at full load and in mine they go up to 1.7 volts. And that's why the fuses were checked and they are ok, the cables with a multimeter are ok and all 4 (current - ground - MAF signal - IAT) have the correct ohmic resistance and the current passes fine. The DPF is not full because it regenerates properly every 400 kilometers. The grounds of the brain were also checked and everything is fine. The turbo inflates at 1.3 bar and is fine and the VNT seems to be working fine and does not stick. So I've gotten into a pattern where I've spent a lot of money and the problem persists. And I've left the best for last. WHEN I DO IT WITH A DISCONNECTED MAF THE PROBLEM NEVER APPEARS. I should note that when the problem occurs, it burns a lot, black smoke I don't see a reason, probably the DPF is holding it in but it stinks of diesel from the back a lot.
The problem seems to be the MAF but what the hell are both new genuine ones defective?? only that I haven't tried getting a 3 new MAF of another brand to try but I'm tired I've paid almost 2000 euros. If you've had something similar please give me an idea so I can fix it
The problem seems to be the MAF but what the hell are both new genuine ones defective?? only that I haven't tried getting a 3 new MAF of another brand to try but I'm tired I've paid almost 2000 euros. If you've had something similar please give me an idea so I can fix it
- Model
- punto evo multijet 1,3 85hp
- Year
- 2011
