R50 loosing power and chugging when accelerating??? - MINI Cooper Forum
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Old Jan 26th, 2009, 10:43 PM
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R50 loosing power and chugging when accelerating???

hey

im wondering if someone can help me out, I have an02 cooper with 96K on the clock, over the weekend i drove over to teeside from belfast, i have driven the MINI all weekend (700 miles) and the car has been perfect, this morning i was starting my journey back to belfast, at this point i had half a tank of fuel left, so i filled the tank and started my journey,

approx 2 hours later i was travelling at a good speed along the motorway when i felt a slight chug from the engine, i thought it may have been a bump on the road and carried on, however i then felt the same thing but harder, so i pulled into the nearest garage for a check, i checked all the tyres, and a quick look over the engine and all looked OK,

since i had no more time to stop i had to carry on driving, however this problem got steadily worse, so much so that everytime i accelerate, the engine looses power for a few seconds and then jolts back again, there are no warning lights and the car seems to be running fine, however this is now happening all the time, making it dangerous to pull out of a roundabout or even overtake a vehicle, its also now happening on all the gears and all different speeds when im accelerating, however it seems ok when im going at a steady speed.

i have been searching and the only thing i can think of is possible dirty fuel? has anyone had this problem before? should i drain the petrol out? or even try the redex fuel cleaner?

thanks for youre help!


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Old Jan 26th, 2009, 10:45 PM
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dodgy!!!!
er it sounds like dirty fuel yeah!!! did u get it from the supermarket cos they got in quite alot of trouble a while ago when a whole bunch of engines went, i believe....??

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Old Jan 26th, 2009, 10:54 PM
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Quote: Originally Posted by Weemann (original)
dodgy!!!!
er it sounds like dirty fuel yeah!!! did u get it from the supermarket cos they got in quite alot of trouble a while ago when a whole bunch of engines went, i believe....??

no, i actually got it in a shell in Yarm! the confusing thing is that i filled up on saturday morning and went on 2 mini runs, it was all fine, and then filled up this morning, at that same garage, and went straight onto the motorway then it happened a while after that? i wasnt too sure if there was possibly bad fuel delivered this morning?

you think i should run it down and refuel it again with super unleaded for a while to clean it out?


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Old Jan 26th, 2009, 11:25 PM
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My Cooper had an issue where it felt like it was tugging back under acceleration. This stopped when I changed the spark plugs. Might be an idea to check those?

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Old Jan 26th, 2009, 11:39 PM
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Change the fuel filter, check you air filter(made it needs to change), also clean very carefully the manifold air pressure sensor...

I bet that after that and a good quality fuel you car will be back like in the old days!
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Old Jan 27th, 2009, 06:31 AM
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is the car still chugging?

could be dirty fuel injectors, try redex on a full tank. super unleaded is supposed to have cleaning properties too, go for shell optimax.
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Old Jan 27th, 2009, 09:37 AM
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could be bad fuel due to the fact that you filled up 2 hours before this started happening.........but I would have really expected it to happen sooner after refueling.

could be spark plugs or fuel filters..........when was it last serviced ?
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Old Jan 27th, 2009, 01:15 PM
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yeah I'm going to check the car over tonight, it was dark by the time I got home. I have half a tank left so I'm going to run that down and then see how it goes too,

I was thinking spark plugs myself, but it started happenng quite suddenly, it wasn't like it had gradually started over a few days? Is that the sort of thing can happen when spark plugs need changed?


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Old Jan 27th, 2009, 01:36 PM
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Quote: Originally Posted by matt_croft (original)
is the car still chugging?

could be dirty fuel injectors, try redex on a full tank. super unleaded is supposed to have cleaning properties too, go for shell optimax.

This is more commonly known as Shell V-Power in the UK: Shell Road Fuels - United Kingdom

Quote: Originally Posted by Deano (original)
I have half a tank left so I'm going to run that down and then see how it goes

Is that wise? If you're getting abhorrent engine behaviour and you suspect the fuel, would it not be better to dilute the bad stuff with fuel you're confident is high quality? You don't want lasting damage to the engine - so I'd brim the tanks with V-Power, if it was me.

All the best,
Andrew.

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Old Jan 27th, 2009, 02:46 PM
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Sounds quite similar to a problem I was having. I changed the HT leads and solved the problem. Once they were out I could see that moistuer had somehow got into one of them and started to rust the connector. Mine is a 53 plate MC as well

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Old Jan 27th, 2009, 03:40 PM
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This is not a fool proof test, but it is a quick way of checking the ignition system.

The ignition system is under its highest load when the engine is breathing deepest, the easy way of doing this is driving on a quiet road, put it into 5th gear and let the car slow down to the slowest it will run in gear (about 25mph which will be around 800rpm) then floor the throttle.

The engine should pull smoothly throught the rev range, albeit slowly.

If any part of the ignition sysytem is bad, it will show up as missing under this kind of load.

I have changed a few ignition coils recently for this fault, and they show up straight away doing this test.

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Old Feb 10th, 2009, 11:03 PM
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Quote: Originally Posted by KillerByte (original)
My Cooper had an issue where it felt like it was tugging back under acceleration. This stopped when I changed the spark plugs. Might be an idea to check those?

asked my mechannic and he said the plugs were all changed in June 08

Quote: Originally Posted by Innuendo (original)
Change the fuel filter, check you air filter(made it needs to change), also clean very carefully the manifold air pressure sensor...

I bet that after that and a good quality fuel you car will be back like in the old days!

i havent done this yet, but i will do this weekend,

Quote: Originally Posted by matt_croft (original)
is the car still chugging?

could be dirty fuel injectors, try redex on a full tank. super unleaded is supposed to have cleaning properties too, go for shell optimax.

i flushed the engine with liqui moly injection cleaner, dome a great job on the engine, but this problem has started up again!

Quote: Originally Posted by AlexBRGCooper (original)
Sounds quite similar to a problem I was having. I changed the HT leads and solved the problem. Once they were out I could see that moistuer had somehow got into one of them and started to rust the connector. Mine is a 53 plate MC as well

my friend has told me to try this, are they expensive to get? or are they easy to do yourself?
Quote: Originally Posted by C.Noble (original)
This is not a fool proof test, but it is a quick way of checking the ignition system.

The ignition system is under its highest load when the engine is breathing deepest, the easy way of doing this is driving on a quiet road, put it into 5th gear and let the car slow down to the slowest it will run in gear (about 25mph which will be around 800rpm) then floor the throttle.

The engine should pull smoothly throught the rev range, albeit slowly.

If any part of the ignition sysytem is bad, it will show up as missing under this kind of load.

I have changed a few ignition coils recently for this fault, and they show up straight away doing this test.

ive tried this and it all seems ok, the car is fine on short journeys, but then it happens and just gets worse and worse the longer you drive?! its almost like the engines getting starved of fuel, but feels like you change gear really badly and it jerks forward,


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Old Feb 10th, 2009, 11:57 PM
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You'd be far better spending your money on a diagnostic rather than replacing parts in the vain hope that they will cure the problem!
It's easy to be an armchair mechanic (god knows I meet loads of them everyday) when its not your own car you're attempting to diagnose! There's always some bloke down the pub who knows best!

ANYONE can post on here and tell you things that it MIGHT be! My mum could do that!

You could change, plugs, leads, fuel filter, air filter, etc etc and it might be none of them. Spend £40 on getting your beast plugged into a diagnostic (try and find a garage with a Bosch KTS system) and pin point the problem! (or at least eliminate some of those options!)
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Old Feb 11th, 2009, 12:11 AM
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Quote: Originally Posted by SiBradbury (original)
You could change, plugs, leads, fuel filter, air filter, etc etc and it might be none of them. Spend £40 on getting your beast plugged into a diagnostic (try and find a garage with a Bosch KTS system) and pin point the problem! (or at least eliminate some of those options!)

Good thinking.

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Old Feb 11th, 2009, 06:34 PM
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Quote: Originally Posted by SiBradbury (original)
You'd be far better spending your money on a diagnostic rather than replacing parts in the vain hope that they will cure the problem!
It's easy to be an armchair mechanic (god knows I meet loads of them everyday) when its not your own car you're attempting to diagnose! There's always some bloke down the pub who knows best!

ANYONE can post on here and tell you things that it MIGHT be! My mum could do that!

You could change, plugs, leads, fuel filter, air filter, etc etc and it might be none of them. Spend £40 on getting your beast plugged into a diagnostic (try and find a garage with a Bosch KTS system) and pin point the problem! (or at least eliminate some of those options!)

well i was told that, but the engine light hasnt came on, can the computer tell you what isnt running properly if the engine light isnt on? if I thought that would tell me id be down there like a shot! but my mechannic had told me, if the fault isnt happening when he has it, and theres no engine light, then how can he find it!!


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