0
If it's a constant misfire, it will. The vehicle would not be declared roadworthy.
Here's a few suggestions you may like to try.
Check the distributor cap for cracks. Moisture can get in and interfere with the spark path.
While the distributor cap is off, check the rotor arm. It may be sooty or oily and need cleaning with a dry kitchen tissue and perhaps some very, very fine emery paper (1000 to 1200 wet & dry) - don't use coarse sandpaper or a file.
Check the HT leads. you may find one of them is damaged, maybe trapped between the bonnet and a high point on the engine or worn - crackling appearance on really old leads.
Check all leads are pushed home fully as there may not be a proper circuit.
Check the plugs are set correctly and they are not worn. you can usually find a link to a website where the plugs are described. The plugs should usually be a light to medium sandy appearance at the tip. Any oil or soot indicates a fault which should be dealt with. Oil may mean that a piston oil ring is faulty or broken - usually three but they all need to work (major job - trained mechanic). Soot may indicate that the fuel mixture is too rich (carburettor needs adjusted - mechanic or good DIY motorist medium work). Worn gap or crack in the plug means it must be replaced - best to replace the whole set at once (minor job - regular motorist).
You need a plug spanner and you need to be careful that you do not cross the threads.
If you are in any doubt, consult a qualified mechanic and allow them to do the work for you. Mechanics can charge between £20 (local) and £100 (dealer) per hour (or part) for their time. Will take less than one hour to change plugs and leads and rotor arm and distributor cap.
Depending on what parts you need, a local Motor Factors (yellow pages - Motor Factors) will have the parts you need at a fraction of dealership prices. Also visit Halfords who will fit most parts for a small fee - typically a few pounds.
Set of HT leads, £20+ [includes one for each cylinder and one for HT coil]
Single HT lead, £5+
Distributor cap, £15+
Rotor Arm, £5+
I am not a mechanic but I have fixed many misfires by following these guidelines. One time, a car was with the dealership for an hour and the mechanics could not find the fault. When I lifted the bonnet, I saw the damaged leads, replaced them and there was no more problem. (Dealership leads, £45, not in stock. Motor factors, £25, in stock) 10 minutes to replace. Do them one at a time. They are usually numbered or they are different lengths that only fit one way. Still, do them one at a time.
Add your answer:
Earn +20 pts
Can a car be too loud?
In the UK MOT test A vehicle can fail for emitting more noise than a standard vehicle. An example being a car fitted with a big bore exhaust would fail the MOT test.
Does the engine management light on fail an mot test?
Yes
Will not having a spare wheel in your car fail your mot?
The spare tyre is not taken into consideration as part of an MOT. There is no legal requirement to carry a spare tyre and it is not part of the MOT test. Even if the spare tyre has a puncture/illegal tread etc. your car will not fail the MOT on this item.
Should you replace a non-working horn on a 1991 Toyota Corolla?
You should in the UK, as your car will fail the MOT test if your horn does not work.
MOT 4 Class Test?
mk12autocare
How much is an obstruction of license plate violation?
the fee for violating the registration plate rules are .. * A fine of up to £1,000 * The registration mark may be WITHDRAWN * The vehicle may FAIL the MOT test
What does most cars fail the mot on?
Brakes and passengers puking upon the seats, not nice.
How can you turn off the abs light on a 1991 Mazda 323 in order to pass the mot im not sure if it can be taken out as think it is in a sealed unit in the dash does it have to come on and go out?
if the codes are stored even with the light removed it will fail because of the stored code when the obd2 or mot If you take the light out you will fail MOT (mine just has). The light must work to pass MOT. If ABS light stays on then it will also fail. You need to fix the problem. (I have a 2000 323) It is not a sealed dash incidently.
How much is an MOT test in Northern Ireland?
£30.50 for a car!
MOT Milton Keynes?
MOT inspectors examine various parts of the vehicle, including suspension, brakes, steering, emissions, seats, seat belts, and doors, during the test. If the vehicle fails the MOT test, it must undergo the necessary repairs and pass a retest before it can be driven legally on public roads. Taking the MOT test seriously is essential to ensure that the vehicle meets the required safety and environmental standards.
What does it mean if I have been given an advisory on an MOT?
An MOT is a British term that involves the testing of a motorized vehicle for road worthiness. Every used car purchased in the United Kingdom should have a MOT test.
How long is it until the first MOT Ministry of Transport test is required?
The MOT test is applicable 3 years after the car was first registered! What the hell is "mot" ? Is that an acronym, abbreviation or a typo? I'm assuming "mot" really means "mod" or modification to the car. How long? You can do it whenever you want. You just have to watch because a lot of mods will limit or void the warrantee. MOT = Ministry of Transport. A test carried out on cars every year to ensure they are roadworthy in the UK. A car needs its first MOT 3 years after first registration. Is this a great website or what? The things one learns!
