Engine running rough after new oil and spark plugs

[troypl Lurker Find all posts View Profile Close troypl]

Hi can anyone offer any suggestions? 120 series Petrol Grande.

I have just changed the oil and new spark plugs. Have done it before on other vehicles but first time on my prado. When I start the car idle is very rough and it fluctuates between 400 RPM and 900 and there is a very strong air pressure sound coming from around the throttle body/ manifold. I have checked that all the plugs are tight and have checked the oil qty level all good.

[turtlewa Member Find all posts View Profile Close turtlewa]

Maybe a vacuum hose not back on check all hoses

[Bear63 Senior Member Find all posts View Profile Close Bear63]

Make sure the maf sensor is clipped in properly

[Guest Close Guest]

Did you disconnect the battery?

[troypl Lurker Find all posts View Profile Close troypl]

Did you disconnect the battery?

Yes i disconnected the battery, why?

[Guest Close Guest]

It's like the ECU is doing a relearn when you disconnect the battery. The low idle (can sometimes stall) goes away after a while. Could be that.

[troypl Lurker Find all posts View Profile Close troypl]

It was a small vacuum hose on the rear left side!! Alteast i will be quicker doing this next time haha. It was very hard to see but i must have disconnected it to get to the plugs