Hi, ive been experiencing problems with my Vw polo 1999 1 litre which ive mentioned in another thread (starting a new one as ive narrowed the problem down))
The car runs fine for 2-3 minutes of driving and then suddenly the engine seems to 'lose' power and its very sluggish to accelerate. I think this is a result of it running 'lean' so to speak. I had one engine tappet fail about a week after this problem started which could be a coincidence but im starting to think this was as a result of the lean running, i.e excessive heat in the engine.
I have 2 thoughts of what it could be thats causing the lean running.
1, i understand the engine runs at open loop when started and switches to closed loop (i.e taking info from sensors) when warmed up- my line of thinking is that my problem starts when switching to closed loop hence maybe i have a sensor that is faulty.
2, The other possibility is that i have a vacuum leak causing the lean running. What i want to know is would the vacuum leak not cause me problems all the time? and not just when the engine warms up after a few minutes? If it would show up all the time then i can eliminate this as a potential cause as like i said-the car runs fine for 3 ish minutes and then bogs down on acceleration quite noticeably.
changed the fuel filter yesterday so ive now eliminated this.
Any comments appreciated
The car runs fine for 2-3 minutes of driving and then suddenly the engine seems to 'lose' power and its very sluggish to accelerate. I think this is a result of it running 'lean' so to speak. I had one engine tappet fail about a week after this problem started which could be a coincidence but im starting to think this was as a result of the lean running, i.e excessive heat in the engine.
I have 2 thoughts of what it could be thats causing the lean running.
1, i understand the engine runs at open loop when started and switches to closed loop (i.e taking info from sensors) when warmed up- my line of thinking is that my problem starts when switching to closed loop hence maybe i have a sensor that is faulty.
2, The other possibility is that i have a vacuum leak causing the lean running. What i want to know is would the vacuum leak not cause me problems all the time? and not just when the engine warms up after a few minutes? If it would show up all the time then i can eliminate this as a potential cause as like i said-the car runs fine for 3 ish minutes and then bogs down on acceleration quite noticeably.
changed the fuel filter yesterday so ive now eliminated this.
Any comments appreciated