Tb42 revving high after backfire

[Marti]

Hello

My patrol has started to idle high, it back fired on fuel last night, and since then it holdes 1800-2000 rpm all the time got or cold. Started it up this morning and it holds 1200-1800rpm and won't go down after warming up.
What could this be and is there a solution, from what iv read the tb42 has a few problems with the auto choke ?

Any help would be appreciated

Thank you for your time

Marti

[Cuppa]

Have no idea if this will apply to a Patrol, but a few years ago I had the same thing happen to a Ford XF efi wagon I had running on gas. What had occurred was that the back fire had distorted some sort of 'flap' in the air box. A new air box was going to cost an arm & a leg, but a local bloke managed to tweak the existing flap & solved the problem.

[GQ TANK]

Is it a carby or efi motor

is it dual feul and the idle is high in LPG? - possible blown mixer

[Airstrike]

Hi mate sorry to hear. I had the same issue with a TB42E big enough to dent my bonnet from debris. When this happen the car went into survival mode with the base idle at 2k. It ended up being the MAF.

tip it tap it slap it

[taslucas]

Yeah as said above, a backfire can damage parts of the fuel system. I reckon it would be worth checking for any distortions in the butterflies or airbox area. Also look for any leaks that may be letting air in.

FanTapstic!

[Marti]

It is a carby, idles same on fuel as it does gas, no flaps or visible damage anywhere, I pulle the auto choke apart and cleaned it, still idles high, on my way home 20 mins into my drive it settled back to normal ish idle, fuck knows whays happened. Ill look at the throttle butterfly's today and see if
Anything going on there

[GQ TANK]

I might have jammed the fast idle cam in the wrong position (its the white thing on the side of the carby below the autochoke.)

[Marti]

Ok anything I can do to rectify the problem

[Airstrike]

I might have jammed the fast idle cam in the wrong position (its the white thing on the side of the carby below the autochoke.)

Sorry mate carby not for me I sincerely hope its an inexpensive fix.

[davo94]

I might have jammed the fast idle cam in the wrong position (its the white thing on the side of the carby below the autochoke.)

Mine loves to do this.

Simple fix just a PITA to get to.

[Marti]

What's the easy fix

[Happy Gilmour]

I get this all the time usually in winter, I just check my vacuum hoses and redo the timing (quite often replace the points as well)

[threedogs]

It will back fire for a number of reasons , an air leak in the system, even running too lean.
When it happened to me small pice of venturi melted off the carbie and jammed under the butterfly
not allowing the carbie to idle