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Old 05-23-2005, 02:20 AM #1
toyoboy toyoboy is offline
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back firing
Ive been working on a customers 2005 4runner v6, that has a back firing though the intake and also hesitates for a second. the way to duplicate the problem is to accel from a stop ... no codes, fuel pressure normal, no intake leaks, timing normal. has anybody come across this problem or have any suggestions.
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Old 05-24-2005, 03:10 PM #2
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Re: back firing
Quote:
Originally posted by toyoboy
Ive been working on a customers 2005 4runner v6, that has a back firing though the intake and also hesitates for a second. the way to duplicate the problem is to accel from a stop ... no codes, fuel pressure normal, no intake leaks, timing normal. has anybody come across this problem or have any suggestions.
Your a Toyota trained ASE mechanic, and your asking us schleps if we know how to fix a Runner?

Bad gas? How many miles? With HVAC on/off?
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Old 05-24-2005, 05:51 PM #3
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Backfiring through the intake?

Sounds like bad timing or a bad intake valve (weak valve spring?).

I would try a compression check on each cylinder...but it does sound a little strange.

On older cars back fire through the intake or carb meant the timing was off, but on modern cars, this is all computer controller. Having said that, the computer relies on sensors for timing and feedback...so maybe check the sensors is the next step...camshaft/crankshat position sensor???

good luck
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Old 05-25-2005, 12:53 AM #4
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Re: Re: back firing
Quote:
Originally posted by Sac State
Your a Toyota trained ASE mechanic, and your asking us schleps if we know how to fix a Runner?

Bad gas? How many miles? With HVAC on/off?
Sac, their are alot of respected techs on this board... just want to see if they have ran across this problem... but anyway, found out yesterday that it has the injectors. thanks for your suggestions.
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Old 05-25-2005, 05:56 PM #5
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Some of the OBD test sets can be hooked
up to a laptop(or PDA) and moniter the
various parameters(including fuel pressure)
while you are driving.

Helps solve intermittant problems.

Cliff s
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Old 05-26-2005, 04:14 PM #6
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Re: Re: Re: back firing
Quote:
Originally posted by toyoboy
found out yesterday that it has the injectors.

What injectors are you talking about?
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