Hi, prior to me letting my local dealer take the shirt off my back to investigate, I thought I'd ask the experts!!
For the last week, my car has developed intermittant lumpy running - it lasts for about 30 seconds and then seems to clear. (Occurs cold and warm, most noticed when up to temperature.)
I receive no warnings on the dash which makes me think it could be the fuel/ fuel filter.
Does anyone have any suggestions - I still have 3 green bars so service is not imminent.
My first thought would be to think that it is the fuel too - I don't think it would be the fuel filter and here's why:
I mistakenly ran LEADED gas in the car around 40,000 miles ago and just recently, changed the fuel filter as kind of routine maintenance at close to 100,000 miles.
It was the original to the car and despite using the leaded fuel as mentioned, the change made zero difference - I really thought that it would so, at least in my estimation, I would guess the you may have a bad tankful.
I'm not sure what it could be and am talking as a lay person but, how about the ECU? Maybe it's not givng the correct starting info and not keeping enough gas to cold idle?
Of course, you do not step on the gas pedal prior to starting? I read where we're not supposed to do that unless it's really cold.
Wondering if it could be the MAFS as they don't always say when they are not working proerly.
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2002-05 Build Carbon Black ///M5
First Aid Kit ~ Warning Triangle ~ Full BMW Tool Kit
Hi, prior to me letting my local dealer take the shirt off my back to investigate, I thought I'd ask the experts!!
For the last week, my car has developed intermittant lumpy running - it lasts for about 30 seconds and then seems to clear. (Occurs cold and warm, most noticed when up to temperature.)
I receive no warnings on the dash which makes me think it could be the fuel/ fuel filter.
Does anyone have any suggestions - I still have 3 green bars so service is not imminent.
Any thoughts would be greatfully received
Regards
Martin
Coil starting to go bad or plug wires worn? Are the spark plugs in good shape and are they tight?
Regards,
Jerry
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'01 Black/caramel
Dinan Stage 3 suspension, SS jet coated headers, ESS SC kit, open brake ducts, Hamann front splitters, TEC cupholder, U.S.(Euro style) tilt/slide armrest, 6k HID fogs, 6k super white low beams, V1/Stealth1, dual head LI, 2.65 diff w/40% lockup/2x dynamic, compact spare, Euro trailer hitch, Mocal oil cooler, ACS type rear spoiler, Rogue custom SSK and tranny mounts, ST 355 BBK (fronts), BP sway bar brackets, Bluetooth retrofit
Any impact on your Cats? I always heard that the lead in the fuel will destroy the platinum catalytic converters....
Sorry to veer off the lumpy topic, but at least it bumps it
A
Yes, initially it made the SES light come on numerous times usually indicating either a CAT or 02 fault but, almost 40,000 miles later, I have not replaced the CATS and all seems to be well.
Just recently however, I did replace the O2 sensors both pre and post CAT and my tech Nate told me after showing me that he had never seen O2 sensors so discolored - he attributed this to the leaded fuel.
See The Pic's------->
Linear Mode
