my 545i recently has been acting up. Sometimes when i come to a complete stop and take off, the car would jerk just a little when taking off, almost like a hesitation, like a little stumble in the gas pedal and when it smooths out it jerks and takes off smoothly after that. Now within the past few days the cars idle stumbles a little bit and when i go to take off the car stumbles alot and dies and cuts out. i put the car in neutral and try and start it and it would just crank. then i put it into park it cranks a little longer than normal and starts up but with a hesitation. I currently have no CEL on at the momment. But every now and then i will throw a code for P0444 evap code, but that code has been on and off since i first bought the car and it never did it before. the car has over 100K on it and i purchased some new spark plugs and air filter and cabin filter, but my feeling tells me its a fuel problem. any information anyone has will be appreciated. thanks.
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I'd start by looking for vacuum leaks, even a loose oil fill cap could do this. If those are OK, try cleaning you MAF sensor and throttle body.
Have you done anything recently to the car? |
Not really engine wise. I was planning on doing the tuneup but i want to fix this problem. Gonna check for all those an clean my MAF and see what happens.
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Sounds like a fuel pump going bad. Check the fuel pressure at the injector rail
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Originally Posted by pauliehcfr
(Post 1411800)
Sounds like a fuel pump going bad. Check the fuel pressure at the injector rail
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I've seen them act like this so I was just throwing some leads out there. They don't have an idle valve so thats out. Only cause for this issue without a CEL would be fuel related.....
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That's what I'm thinking. It has to be fuel related.
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Does it ever lose power or want to quit at under load?
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No when I first go to take off under a light throttle it will stumble and stall. But if I rev it up hard and then go its good all after that. Steady 40-50 mph or any speed has no problems. Only when I first take off.
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This stumble has been happening for maybe 3 weeks but it never stalled just jerked a little when taking off i thiught it was the trans. But into maybe the 2nd week it stalled once and just on Saturday is when it stalled like 5 times within 5 minutes of driving. Almost every time I stopped the idle would stumble and when I take off it would stall as if it wasn't getting gas. I haven't driven the car since then or checked it out since I don't really use the car on weekdays.
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