Car Help Pls.!

[raj]

this is regarding the car i use for taxi hire, its a 02 toyota avensis.

what areas should i be looking at to source the problems its having?
problem is that it will randomly start hunting! the revs will rise and fall between 500 and 1000 rpm.
sometimes its fine but more than often it does the above.

[Alastair]

It will probably be a sensor, try coolant temp sensor...

[raj]

It will probably be a sensor, try coolant temp sensor...

how would a coolant temp sensor effect the idle and cause hunting

[R5GTTRaider]

by the car not knowing the temprature of the engine to ajust the fueling correctly??

[raj]

by the car not knowing the temprature of the engine to ajust the fueling correctly??

ok thanks
any other areas i can check?

[R5GTTRaider]

vacum leaks

always a major player in hunting, or tps

check all vacum hoes and any spilts AFTER the afm in the inlet pipe

after that then itll be a dignosic check, think there moble guys that charge ?£40 for the first hour and 25 after , but with what can be said to be a simple problem could take less then a hour, but if theres no error codes your be lost even more,

[Scoff]

check for air leaks, cracked pipes, that kind of thing.

have you had diagnostics on it ? is it throwing up any fault codes ?

[Scoff]

oops, I was a bit slow that time

[raj]

vacum leaks

always a major player in hunting, or tps

check all vacum hoes and any spilts AFTER the afm in the inlet pipe

after that then itll be a dignosic check, think there moble guys that charge ?£40 for the first hour and 25 after , but with what can be said to be a simple problem could take less then a hour, but if theres no error codes your be lost even more,

thanks for that bud will give it a good look over.

[raj]

check for air leaks, cracked pipes, that kind of thing.

have you had diagnostics on it ? is it throwing up any fault codes ?

not done a diagnostics check yet, was hoping to try sourcing the prob before spending money on it. also im assuming a buggered lambda sensor can cause this prob too?

[Sparkie]

you can use any OBD tool to have a look at it as its after 2000 and a petrol model. this should then tell you which area to start looking in.

[Frix]

not done a diagnostics check yet, was hoping to try sourcing the prob before spending money on it. also im assuming a buggered lambda sensor can cause this prob too?

this is the first thing i would check Raj!! lambda sensor is more than likely your problem!!

[Tiny Tim]

I'd check the idle control valve as well.

[TURBO'D CLIO]

I'd check the idle control valve as well.

Agree, give it a clean with carb cleaner or brake cleaner while your at it to...