Hi guys,
I've got a very tricky and nasty problem that hopefully will be solved with your help.
The car: Micra K11 '99
The engine: 1.3
The gears: NCVT
The problem is that when the car is properly warmed and I try to slow down from any speed when the speedometer approaches the 25~20 km/h the engine over revs at about 2500 rpm. The effect is just like when shifting down manual gearbox and releasing the clutch very quickly so that the engine suddenly raises the revs. The car even slides tires occasionally while slowing down, which can be pretty dangerous if it is wet. It does not matter how fast you are driving. It does it every time after it is warm enough.
Several weeks ago I've changed the whole ignition module and after that it was calibrated with stroboscope. The reason for that was ignition problems while speeding up (I am wandering if this might be the cause of all the problems).
I've also checked a day ago the CVT brushes, cleaned the throttle body very carefully with carburetor spray (without re-soldering the PCB - it seemed too invasive procedure) and cleaned the idle speed control motor without any actual change in the behavior.
One of my guesses was the electrical system. I've checked the alternator today (call it 6th sense) and the readings were less than 14 volts when idling with headlights. After I turned on the AC and started to play with the electrical windows, the readings get below 12.75 volts. Is that normal or my alternator is heading towards the trash can? I know that the clutch is electrical and I was wandering if during slowdown because of the consumption of the brake hydraulics maybe it runs out of power and eventually slip.
My second guess was that when the car warms up properly the MAF sensor is not reading correctly and while leaving the car without any air by releasing the throttle pedal and pushing the brakes, the only thing that operates is the idle speed control motor, which I believe is controlled by the MAF itself and some other engine temperature readings (correct me if I am wrong).
Before I get very boring (I might have already crossed that border) I want to ask for an expert opinion so please advise. This is my wife's car, but I've kind'a started to enjoy it quite a lot and it would be a shame to let her go (not the wife).
P.S. I know that I am starting a second thread, but the original one was with the assumption that there was a problem with the CVT and clearly it is not like this so I decided to get a fresh summary.
I've got a very tricky and nasty problem that hopefully will be solved with your help.
The car: Micra K11 '99
The engine: 1.3
The gears: NCVT
The problem is that when the car is properly warmed and I try to slow down from any speed when the speedometer approaches the 25~20 km/h the engine over revs at about 2500 rpm. The effect is just like when shifting down manual gearbox and releasing the clutch very quickly so that the engine suddenly raises the revs. The car even slides tires occasionally while slowing down, which can be pretty dangerous if it is wet. It does not matter how fast you are driving. It does it every time after it is warm enough.
Several weeks ago I've changed the whole ignition module and after that it was calibrated with stroboscope. The reason for that was ignition problems while speeding up (I am wandering if this might be the cause of all the problems).
I've also checked a day ago the CVT brushes, cleaned the throttle body very carefully with carburetor spray (without re-soldering the PCB - it seemed too invasive procedure) and cleaned the idle speed control motor without any actual change in the behavior.
One of my guesses was the electrical system. I've checked the alternator today (call it 6th sense) and the readings were less than 14 volts when idling with headlights. After I turned on the AC and started to play with the electrical windows, the readings get below 12.75 volts. Is that normal or my alternator is heading towards the trash can? I know that the clutch is electrical and I was wandering if during slowdown because of the consumption of the brake hydraulics maybe it runs out of power and eventually slip.
My second guess was that when the car warms up properly the MAF sensor is not reading correctly and while leaving the car without any air by releasing the throttle pedal and pushing the brakes, the only thing that operates is the idle speed control motor, which I believe is controlled by the MAF itself and some other engine temperature readings (correct me if I am wrong).
Before I get very boring (I might have already crossed that border) I want to ask for an expert opinion so please advise. This is my wife's car, but I've kind'a started to enjoy it quite a lot and it would be a shame to let her go (not the wife).
P.S. I know that I am starting a second thread, but the original one was with the assumption that there was a problem with the CVT and clearly it is not like this so I decided to get a fresh summary.