hi,
just bought my frist polo, its a white 1989 hatchback model C on an F plate. it had a bit of a miss fire when i frist drove it home so i checked the plugs and one of them was crodded,as was the leads. so i changed lead and plugs, i fitted copper leads, and GKN plugs. its sovled the problem, but and its BIG BUT .
i now i another problem. every now and again i start it up and try to pull away and its flat and wont drive any faster than 20 mph. i found if i pump the thoutle pedel it makes it go faster but as soon as i hold it in a steady postion it dies. any idea any one?
i found even at temprater the flap in the intake pipe is open and drawing in warm air from the manifold. could it mean the the auto chock is sticking on? is there away of making it a manel chock? or sovling my proplem? thanks for your help
i really need to fix it before the weekend as im drivng down to bristol.
cam.........
MK II polo running problems plz help
Auto choke......
Auto choke on these is a bit of a nightmare. When you open up the compartment containing the air filter you'll see a small rectangular block to the left of the carb. This block is basically a valve with a thermostat in.
The way the flap works (if I remember rightly) is by suction. Air is sucked in by the rectangular block (and the flap closes thus allowing air warmed by the exhaust to enter the carb) When the air temp goes above a certain level, the thermostat inside cuts off the suction flow to the flap and it opens allowing cool air into the carb.
You can check the operation of the flap by disconnecting the pipe which runs between the flap and the rectangular block (disconnect from the block end) and then suck on it gently. The flap should close as you suck and then spring back when you take the suction away.
If this works but the flap is staying stuck in the 'open' or 'close' position then the rectangular block needs replacing as the thermostat has probably gone.
I had a problem whereby my mk2 kept cutting out when it got to a certain temperature so I checked this and noticed that the rectangular block had been bypassed (ie: both tubes removed from the block and joined together) So I got a few from the scrappy and tried them all until I found one that works okay. I do still have a bit of a problem in winter but I think that is just down to carb freezing. I'll probably try what is suggested on the following link this winter if I start having problems:
http://www.tigerstyle.co.uk/poloforum/v ... highlight=
The way the flap works (if I remember rightly) is by suction. Air is sucked in by the rectangular block (and the flap closes thus allowing air warmed by the exhaust to enter the carb) When the air temp goes above a certain level, the thermostat inside cuts off the suction flow to the flap and it opens allowing cool air into the carb.
You can check the operation of the flap by disconnecting the pipe which runs between the flap and the rectangular block (disconnect from the block end) and then suck on it gently. The flap should close as you suck and then spring back when you take the suction away.
If this works but the flap is staying stuck in the 'open' or 'close' position then the rectangular block needs replacing as the thermostat has probably gone.
I had a problem whereby my mk2 kept cutting out when it got to a certain temperature so I checked this and noticed that the rectangular block had been bypassed (ie: both tubes removed from the block and joined together) So I got a few from the scrappy and tried them all until I found one that works okay. I do still have a bit of a problem in winter but I think that is just down to carb freezing. I'll probably try what is suggested on the following link this winter if I start having problems:
http://www.tigerstyle.co.uk/poloforum/v ... highlight=
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quinny
- Bronze Member
- Posts: 104
- Joined: Tue Jan 11, 2005 8:00 pm
- Location: Maidstone Kent. Andy Boakes G40 Engine Specialist
It's most probably the autochoke which has been pretty much explained above.
If the autochoke valve is still functioning correctly then you may have some blocked jets or general s**t in the float chambers or arteries/venturies. This will just need stripping down and cleaning out.
You can clean the carb with carb cleaner spray and redex petrol treatment.
Change the fuel filter with a nice clean one.
Check that the fuel pump is working properly so the car isn't running lean, can be done with a coke bottle on the end of the nipple and a quick turnover, it should fill a third of the bottle very quickly. There is also a little hole on the underside of the fuel pump, make sure this isn't leaking, if it is then you have an oil leak dripping onto cylinder no.4 (causing misfires and low compression) or have oil contaminated fuel being used in the mix if the pump seal has gone really bad.
If the autochoke valve is still functioning correctly then you may have some blocked jets or general s**t in the float chambers or arteries/venturies. This will just need stripping down and cleaning out.
You can clean the carb with carb cleaner spray and redex petrol treatment.
Change the fuel filter with a nice clean one.
Check that the fuel pump is working properly so the car isn't running lean, can be done with a coke bottle on the end of the nipple and a quick turnover, it should fill a third of the bottle very quickly. There is also a little hole on the underside of the fuel pump, make sure this isn't leaking, if it is then you have an oil leak dripping onto cylinder no.4 (causing misfires and low compression) or have oil contaminated fuel being used in the mix if the pump seal has gone really bad.