Fj73 3f carby not running right (2 Viewers)

[lachy99]

Hi I have a 1985 fj73 landcrusier which up until now has been running fine. Went down the highway and exited and pulled up to a set of lights and noticed straight 6 was idling like a lumpy v8 with a bit of smoke coming out the back but one i make it to 2nd gear its fine. Anyone have a clue what this might be i replaced all the vacuum lines made no difference. Dont want to mess with the carb if something else is the issue.

cheers

 

[RHINO]

Very difficult to diagnose over the web, but it sounds more like your having a misfire problem at idle that might be caused by oil fouling

Pulling the spark plugs for a visual may tell you alot.

 

[Rook]

How many KMs on it mate? The head on my 3F went at 350,000. Sounds scary but not the hardest job around.

Alternatively, start small:
- Id take the intake off, spray some carby cleaner in there and give it a good rev to clear it out
- Give the dizzy a look over and see if the timing is out
- Give your fuel filters a sus. Fuel tank might need a clean out.

My engine used to cut out whilst driving. Those 3 dot points essentially fixed it.

 

[roscoFJ73]

What colour smoke? There is a number of reasons it could happen, but most likely bad spark plugs. But with smoke , it could be a cyl with low compression and its causing your plugs to oil up. In the past I ran hotter spark plugs to burn the oil off, but its only a temporary fix.