4Runner Backfired now it wont idle.

Submitted: Monday, Feb 04, 2008 at 13:54
ThreadID: 54222 Views:2066 Replies:8 FollowUps:5
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Hi there, I have a 1994 Toyota 4Runner V6 which is on Gas.

The car was sitting for three days (camping). When I stopped the car it was on Gas.

I went to start the car - there was a huge backfire, now the car wont idle on Gas or Petrol. My mechanic has had it for 3 weeks and cant find the problem.

Has anyone out there any suggenstion?
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Reply By: Andrea11 - Monday, Feb 04, 2008 at 14:06

Monday, Feb 04, 2008 at 14:06
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
AnswerID: 285523

Reply By: RV006 - Monday, Feb 04, 2008 at 14:07

Monday, Feb 04, 2008 at 14:07
Thanks Andres I will mention this to the mechanic.
AnswerID: 285525

Reply By: MrBitchi (QLD) - Monday, Feb 04, 2008 at 14:22

Monday, Feb 04, 2008 at 14:22
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.
AnswerID: 285528

Follow Up By: pt_nomad - Monday, Feb 04, 2008 at 16:26

Monday, Feb 04, 2008 at 16:26
I'd put my money on this being the problem.
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FollowupID: 550522

Reply By:- Monday, Feb 04, 2008 at 14:40

Monday, Feb 04, 2008 at 14:40
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.
AnswerID: 285531

Follow Up By: RV006 - Monday, Feb 04, 2008 at 14:46

Monday, Feb 04, 2008 at 14:46
so what was the problem, is there a quick fix solution so i can sell the car????
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FollowupID: 550489

Reply By: Member - Paul S (VIC) - Monday, Feb 04, 2008 at 15:18

Monday, Feb 04, 2008 at 15:18
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
AnswerID: 285538

Follow Up By: RV006 - Monday, Feb 04, 2008 at 15:24

Monday, Feb 04, 2008 at 15:24
Thanks Paul,

My mechanic has tried the Flow Control Sensor some Ignition thing and it still not working.

But thanks for your advice

Sue.
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FollowupID: 550505

Follow Up By: Member - Paul S (VIC) - Monday, Feb 04, 2008 at 15:48

Monday, Feb 04, 2008 at 15:48
Sorry Sue, I left out 'diaphram' after perforated.
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FollowupID: 550507

Follow Up By: DesF - Monday, Feb 04, 2008 at 17:44

Monday, Feb 04, 2008 at 17:44
Hi, My mate has a Falcon wagon on gas, and it will backfire if you reved it when the gas runs out,( or changing form gas to petrol) and it blew a piece out the bottom of the airbox , took a bit of finding, ran like a dog untill we found it, pop rivited a patch over it and good as gold. Gas fitter was talking new this and that about $150.00,???
Cheers Des.
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FollowupID: 550550

Reply By: Member - Tour Boy (springsure- Monday, Feb 04, 2008 at 17:21

Monday, Feb 04, 2008 at 17:21
Forget the mechanic and take it to a gas installer/ repairer they will know right away if they know what they are doing.

Dave
Cheers,
Dave
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AnswerID: 285570

Reply By: Ozboc - Monday, Feb 04, 2008 at 19:18

Monday, Feb 04, 2008 at 19:18
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 -
AnswerID: 285603

Reply By: Member - Ron O (VIC) - Monday, Feb 04, 2008 at 21:20

Monday, Feb 04, 2008 at 21:20
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
AnswerID: 285645

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