Basically partners Fiat Pinto Mk2 2002 has a slight problem. It seems to pulse slightly on idle and struggles on hill starts with slight hesitation. Now we know it’s not the coils as these were replaced two weeks after we bought the car. Engine management light is not illuminated either. Any ideas? Could it be fuel filter related?Posted 4 years agocouldashouldawouldaMember
Could be lots of things. Why do you suspect fuel filter?
pulse slightly on idle
Likes its vibrating, or is it temporarily cutting out, or is it constantly increasing and decreasing the engine speed when at idle?
Same when warm and cold? In the dry and damp? When up to speed it’s fine?
struggles on hill starts with slight hesitation
Can you elaborate a bit please.
I’d guess 10p of someone elses money that its either a sensor: lambda / air flow, or coils.Posted 4 years agohonkiebikedudeMember
1.2 , 8 valve ?
If so , throttle potentiometer used to be a common fault . Can be bought as a spare part with out replacing the complete throttle body . Can be checked in live data using diagnostic equipment .
There are special tools to replace it , but can be done without using them if you’re carfull .Posted 4 years ago
It’s a 1.2 16 valve Elx Automatic. Basically when it idled it sort of struggles ever so slightly but is fine under load. Hot or cold engine not really a factor. Just does it at idle and with car facing up or down hill. Revs don’t increase or decrease its like something is stopping fuel getting through. Or like if your in too high a gear going uphill in a manual car that type of kidder but not as bad.Posted 4 years agocouldashouldawouldaMember
At full tilt – it’s ok? On the motorway / accelerating hard? If it is ok I doubt it’s fuel related (you havent put diesel in there?).
I’m guessing you couldnt borrow an ODB2 reader from someone you know? Some pending failures dont always light up the engine management light but do register.
BTW – I hadnt in anyway imagined it would be an auto – is it exactly the same in neutral as “D” when idling?
BTW 2 – I thought I had a daft user name!Posted 4 years agomotivforzMember
HT leads as above are a good cheap fault finder, and also should be part of a service regime so you’re not losing anything by replacing them.
Check/replace sparks. Again if you haven’t changed them in a year or 2 then just replace them and call it a service.
Check the crank sensor is fitted securely. (lhs of engine bay as you look under the bonnet, down below the plastic timing belt cover down the bottom of the engine, goes onto the crankshaft pulley, wire comes out towards the radiator).
Vacuum hoses (plastic cover near the lhs wiper arm pivot – nearside of car) can split or fall off connections.
I’ll have a think and see if i can remember anything else obvious on mine.Posted 4 years ago
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