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1MZFE backfires into the air intake

1MZFE backfires into the air intake

Postby carstenmeiner » Sun Aug 08, 2010 3:56 am

Hi guys.

When I rev my gen.4 V6 up to about 3600-3800 rpm it backfires into my Injen air intake. What can it be ? The sparkplugs ? Any suggestions ?

Carsten - Denmark.
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Re: 1MZFE backfires into the air intake

Postby 99BlackSandv6 » Sun Aug 15, 2010 8:56 pm

Has the engine been apart and worked on recently?
When did it start backfiring?
Trust me, I'm a technician.
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Re: 1MZFE backfires into the air intake

Postby carstenmeiner » Mon Aug 16, 2010 7:15 am

99BlackSandv6 wrote:Has the engine been apart and worked on recently?
When did it start backfiring?


No it hasn't been apart or worked on recently.
I haven't used it for about 6 months and when I started using it again it backfired.
I have changed the sparkplugs and it has helped a lot but it still backfires when I rev it up to about 5000-5500 rpm
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Re: 1MZFE backfires into the air intake

Postby 99BlackSandv6 » Mon Aug 16, 2010 7:37 am

Maybe because it sat for 6 months, the fuel has broken down.
Has the Check Engine Light come on?
If it ran fine when you parked it, it should run fine now.
Trust me, I'm a technician.
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Re: 1MZFE backfires into the air intake

Postby carstenmeiner » Mon Aug 16, 2010 7:41 am

99BlackSandv6 wrote:Maybe because it sat for 6 months, the fuel has broken down.
Has the Check Engine Light come on?
If it ran fine when you parked it, it should run fine now.


The fuel has been "changed" and the check engine light hasn't come on.
It ran fine when I parked it - no problems at all..
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Re: 1MZFE backfires into the air intake

Postby 99BlackSandv6 » Mon Aug 16, 2010 8:03 am

Well, plugs and fuel are the most likely.
I guess you have taken care of both of those.
Maybe the problem will just fix itself.
Trust me, I'm a technician.
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Re: 1MZFE backfires into the air intake

Postby trentmeyer23 » Thu Aug 26, 2010 2:36 am

maybe a faulty inlet valve
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