aje9999
New member
Hi Hope someone can help me,
My partner has a Cinquecento sporting which she loves N reg 55,000 miles .
However it recently started misfiring when it has always been a good runner and first time starter. I whipped the plugs out and they were very carboned up as if running rich. She had also mentioned a strong smell of petrol.
Cleaned plugs but no great difference getting very black again though after only a few miles.
In the end changed plugs and leads and all ran well although I noticed plugs were getting choked up again very quickly.
After about a week of running she mentioned a return of a slight misfire and lack of engine power intemittently similar though not as bad as the original problem.
I think at first it may have been running on 3 cylinders due to a faulty HT lead I guess this is where the missing and smell of petrol was coming from however since I replaced those there is no smell of petrol but just the return of intermittent missing and slight lack of power occasionally.
The car is not using water and there is no suggestion of Creaming up in the Oil filler cap so I think the Head Gasket is ok.
I should point out the last time I worked on a car proper was way before all this fancy new stuff, points condenser and plugs was my thing!!!!
I think the car maybe running rich causing the plugs to choke up. I have seen ref on the forum to the Lambda sensor and MAP sensor controling mixture (I think) !!
1)Where are these sensors and are there any test that can be done to check them for operation ?
2) Any other ideas as to the possible cause?
All suggestions much appreciated.
Thanks Adrian
My partner has a Cinquecento sporting which she loves N reg 55,000 miles .
However it recently started misfiring when it has always been a good runner and first time starter. I whipped the plugs out and they were very carboned up as if running rich. She had also mentioned a strong smell of petrol.
Cleaned plugs but no great difference getting very black again though after only a few miles.
In the end changed plugs and leads and all ran well although I noticed plugs were getting choked up again very quickly.
After about a week of running she mentioned a return of a slight misfire and lack of engine power intemittently similar though not as bad as the original problem.
I think at first it may have been running on 3 cylinders due to a faulty HT lead I guess this is where the missing and smell of petrol was coming from however since I replaced those there is no smell of petrol but just the return of intermittent missing and slight lack of power occasionally.
The car is not using water and there is no suggestion of Creaming up in the Oil filler cap so I think the Head Gasket is ok.
I should point out the last time I worked on a car proper was way before all this fancy new stuff, points condenser and plugs was my thing!!!!
I think the car maybe running rich causing the plugs to choke up. I have seen ref on the forum to the Lambda sensor and MAP sensor controling mixture (I think) !!
1)Where are these sensors and are there any test that can be done to check them for operation ?
2) Any other ideas as to the possible cause?
All suggestions much appreciated.
Thanks Adrian