172 Cup Overfuelling problem :(

[StandardMatt]

Hi all,

Already had a browse but couldnt find what I was after.

Pulled out of a junction the other day when my car started what i thought was missfiring, so changed the plugs and now it seems as though it is overfuelling very badly.

Someone suggested there might be an air leak from when i put the inlet back on but i havent had time to check as off yet. Im taking it to a mechanic I know today and he is having a look tomorrow with any luck.

He had a quick look on friday and guessed that the autochoke was not shutting off, so thought it was lambda or some temp sensor?

Just after a few suggestions to lead us in the right direction to save him checking/replacing things that dont need doing!

Thankyou
Matt

 

[Da]

Lambda sensor
Map sensor
Coolant temp sensor

They're the three I'd be checking initially.

 

[Munson]

If it's the coolant sender, it's most likely the wiring rather than the actual sensor itself. Easy to diagnose, as the needle will be all over the place when it's misfiring.

 

[mini-valver]

What makes you say its overfueling?

 

[StandardMatt]

I'm pretty sure it's overfuelling because when you give it some revs it clears and runs fine. It's only at tickover or if you hold it at a certain revs it will e very rough. Oh and it obv sticks of fuel.

Cheers for that I will pass these things on.

 

[StandardMatt]

Turned out to be a temperature sensor, runs lovely now! Thanks for the advice!