4Runner Backfired now it wont idle.

Hi there,

We have a discovery on gas and this same thing happened to us, we found the problem was when the car back fired it blew the lid of the airfilter box just slightly, once my husband fixed it we then took it to the company that installed the gas and they had to re do the mix..........I hope that makes sense as I'm not at all mechanically inclined.

Andrea

Thanks Andres I will mention this to the mechanic.

What usually happens is they destroy the Mass Air Flow sensor (I assume the 4Runner has one) which is just on the engine side of the airbox.. Common problem in Gas fired Pajero's ;-(

Only cure is a new sensor.

Oh my God....now you're bringing back my worst nightmares from approx 6 years ago.

I had that problem happen so often. In the end I sold the car as I was advised by my mechanic one of these times the fix would be VERY expensive.

G'day RV006,

Had the same problem many years ago with a ford falcon on gas. Turned out to be a perforated in the gas regulating system. Whilst it was replaced for a relatively small cost, you may have a different system.

Also, more recently at work, one of our small hilux 2.7L workmates on gas backfired on start-up and blew one of the vacuum lines off which made it idle roughly; although I think your mechanic would have discovered this after a 3 week search.

Good luck,
Paul

Forget the mechanic and take it to a gas installer/ repairer they will know right away if they know what they are doing.

Dave

question could be how far back did the backfire go ?

as someone else mentioned - the airbox and hoses are usually the first things to get damaged - and will cause the problems you mention - maybe even the gas mixer / converter may have been damaged -

Have a 1991 4runner v6 on gas same thing happened to me, it was air flow metre found out after putting it on a dyno cost $600 for new metre she has 390000 on the clock still runs like a dream