hunting on tick over

[allanr5gtt]

i have had f4r lump sat up for a while ,but now have it up and running but it hunting on tick over (up and down up and down)
i thought it was an air leak as the manifold have been off when the cambelt was done (not been running since) but after checking for air leaks a few times . i woundering if it could be water temp sensor ?or could the cam belt being a tooth out causeing the hunting?
thanks allan

[Pete@Backyard Racing]

Sounds like a breather fault split vac hose or probably a sticking throttle body.

[Kingscott]

Possibly idle control valve? remove try a clean or replace! but I must admit it does sound like a slight manifold air leak, can you hear a sucking sound anywhere?

How much is it hunting? them engines do

Regarding the belt being out, I believe it would miss right through the rev range if this was so.

[Pete@Backyard Racing]

Try spraying a can of carb cleaner around the engine and listening for an increase in tick over

[allanr5gtt]

Sounds like a breather fault split vac hose or probably a sticking throttle body.

could be throttle body, i will try that tomorrow.

what about tps being out of line?

[allanr5gtt]

Possibly idle control valve? remove try a clean or replace! but I must admit it does sound like a slight manifold air leak, can you hear a sucking sound anywhere?

How much is it hunting? them engines do

Regarding the belt being out, I believe it would miss right through the rev range if this was so.

doesn't have idle control valve, but thats what it's like?

it's hunting around 500 or 600 rpm

[allanr5gtt]

Try spraying a can of carb cleaner around the engine and listening for an increase in tick over

good idea bud didn't think of that something else for tomorrow.:agree:

[allanr5gtt]

turned out to be map senor had a bad earth.