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MG MGF Technical - what next please miss

Hi my Mgf is Missfiring when you blip the throttle.
changed ht leads put a m a p sensor on gave the coil packs a clean still no good the plugs look ok
to me this. the plugs look ok this has got me baffled anyone else had this problem..

to make matters worse its raining so had stop still need to put everything back is dr rob bell around

Thank You

Darren Jeffery
Darren Jeffery

I think Rob is for a walk in lexandrapark with the pushchair ;)

It's a VVC, isd it ?
Did you check the coolant temperature sensor connections ?
Could you measure the oxigen sensor function ?
Just some quick ideas.
http://www.mgfcar.de/sensor/index.htm

Dieter

hi dieter my car is mgf 2001 k seires standard mems 3 none vvc its funny but you blip the throttle ok than rough then ok on the down revs, could the spark plugs cause this could they be cleaned the tips could i put a glove on and puull the ht lead to see if the sound changes ??

darren shes in tatters at the moment with the rain pouring down in milton keynes england
Darren Jeffery

hi all done the ht leads gave them some contact cleaner..ok
done all the sensors fine drove home last night ok went to the work this morning to find it missfired again when i put my foot down ...

so i have done ht leads throttle sensor lambada sensor coolant sensor map sensor all ok i did notice when i went to start up the coolant light on the dash came up and i had to pump the pedal to get it started last night but no misfire ...

could a coolant sensor make the f missfire how about air filter??

or put it on a test book its really annoying i thought i had it cracked last night to find i hadnt this morning

darren jeffery

Darren Jeffery

Darren,

How old are the plugs (how many miles)? You're not supposed to clean them - if you used anything abrasive you could have created a track to earth. You can't really tell if they're ok visually. Also, be careful playing with the HT leads even with gloves on - the shock from electronic ignition ain't pleasant.

Could be air filter - when you put your foot down it will "bog down" if it doesn't get enough air. Easy enough to check and cheap to change.

Cheers,
Tim
T Jenner

Mind you also on the other side of the engine.
Check the catalyst whether it's broken and blocked.
Dieter

ok you are brilliant
what i did at lunchtime was take the parcel shelf out and gave the contacts a good clean

the plugs went in at 51000 now shes does 61000
how do i check the catalyst for it to be blocked
and the air filters not much money
Darren Jeffery

>how do i check the catalyst for it to be blocked

Bolt off and look inside. The only way I know.
Dieter

hi all got the car done one plug had burnt out on cylinder 3 . it had a nice lighting line right down it it was arching out . caused the missfire the nice AA man sorted it out i feel better now tip is to make sure your leads and plugs are changed i thought mg plugs lasted longer than 8000 miles must have had a bad one
thank you to everyone who gave there input to me
dave andrews, dieter, tim jenner, and a host off others

darren jeffery
darrenjeffery

just a note on my car the missfire has gone burnt out plug . but i do a little sttter in 2nd and 3 rd do think a some injector cleaner could do the trick shes running fine now but as above a liitle stutter .....
darren jeffery

This thread was discussed between 15/03/2008 and 19/03/2008

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