'03 cooper s backfire idle and cutoff problems

5

Asked by Oct 12, 2012 at 07:07 PM about the 2003 MINI Cooper S

Question type: Maintenance & Repair

i have a 2003 mini cooper s. it always idles between 900-1100 when its suppose to be at 750. it
backfires when the rpm starts to play and usually struggles for a little then cuts off. ive been to a
couple of mechanics and have done alot of research on the matter looking at forums and whatnot
but could not find a solution to this problem. the cutting off has gotten alot worse, and is really
starting to bug me.

Solutions that havent worked:
searched for an intake leak
changed gas cap
changed evap solenoid (fuel diagnostic pump)

any suggestions
im thinking its probably a sensor or something

5 Answers

5

backfiring doesnt always occur when the rpm plays but the missing filler cap light always comes on right after or during backfire

2,965

You need to be sure it is backfire, if it is could be a bad crank sensor or ect. Also bad injectors can cause backfire but you need to read the codes. Also make sure if the explosions don't come from the intake because that is a different issue. When you have more info write to be of more help.

8,925

perhaps the engine is remaining in "open loop", meaning it is always reading 32 degrees, and the temp sensor isn't telling the computer, or computer isn't communicating with the i.a.c., so sensors to check .ma.p./maf (same sensor come companies refer to it as either, engine temp sensor...either will cause all these problems, it sounds like the engine is operating as it should but again the fuel is not reducing (as it hits closed loop), 900-1100 is started cold, a few moments, and should drop down...i'd start there...let me know if i can help you further

1 of 1 people found this helpful.
4,695

Did they pull any faults out of the vehicle? I see they have replaced you LDP (leak diagnostic pump) I don't belive your check gas cap light is related to the running rough concern. That pump for the evaporative emission runs off of engine vacuum and if the engine is running rough while the vehicle is trying to test the system it could cause a false reading. I would try a fuel pressure test. It kinda sounds like your engine is being starved of fuel. Hope this helps keep us informed.

1 of 1 people found this helpful.
8,925

mini is a bmw company now, and they (BMW) had to recall i forgot how many thousands of cars due to fuel pump issues, that was 2 years a go or more,

1 of 1 people found this helpful.

Your Answer

Cooper

Looking for a Used Cooper in your area?

CarGurus has 9,246 nationwide Cooper listings starting at $2,320.

ZIP:

MINI Cooper Experts

  • #1
    Tom Demyan
    Reputation
    730
  • #2
    Robert Charlson
    Reputation
    520
  • #3
    mightymini11
    Reputation
    460
View All

Related Models For Sale

Used Volkswagen Beetle
210 Great Deals out of 7,613 listings starting at $1,200
Used BMW 3 Series
1,121 Great Deals out of 32,630 listings starting at $1,000
Used Honda Civic
802 Great Deals out of 72,084 listings starting at $1,400
Used Jeep Wrangler
307 Great Deals out of 16,134 listings starting at $2,972
Used Ford Mustang
709 Great Deals out of 38,398 listings starting at $895
Used Volkswagen GTI
135 Great Deals out of 8,440 listings starting at $2,400
Used Honda Accord
1,031 Great Deals out of 60,523 listings starting at $999
Used Chevrolet Camaro
382 Great Deals out of 30,498 listings starting at $3,500
Used Mazda MX-5 Miata
67 Great Deals out of 4,296 listings starting at $1,900

Used Cars For Sale

2017 MINI Cooper S For Sale
4 Great Deals out of 329 listings starting at $20,900
2016 MINI Cooper S For Sale
4 Great Deals out of 75 listings starting at $18,985
2015 MINI Cooper S For Sale
7 Great Deals out of 248 listings starting at $13,990
2014 MINI Cooper S For Sale
10 Great Deals out of 281 listings starting at $13,995
2013 MINI Cooper S For Sale
12 Great Deals out of 209 listings starting at $8,995

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.