86-95 Trucks & 4Runners 2nd/3rd gen pickups, and 1st/2nd gen 4Runners with IFS

Fuel injector problems

Old 03-14-2019, 12:55 PM
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Fuel injector problems

I'm having problems with my 91 4 runner is it possible to over tighten fuel injectors
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Old 03-14-2019, 03:25 PM
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What is the problem? Which engine?
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Old 03-15-2019, 05:06 AM
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Injector problems

Originally Posted by snippits View Post
What is the problem? Which engine?
Its the 3vze 3.0 my husband rebuilt the injectors be we're wondering if you can over tighten them and if so what will happen if you do
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Old 03-15-2019, 08:16 AM
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Aren't they just stuck there between the intake and the fuel rail? As in they don't screw down?
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Old 03-15-2019, 09:00 AM
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Hard to imagine you could "over tighten" injectors.

Here's the manual; look at page 227 The fuel rail is tightened to only 9 ft-lbs (the rail has rubber isolators, so you COULD over tighten the rail. I'm not sure that would directly affect the injectors.) Note that you should be able to rotate the assembled injectors (the gasoline "lubricant" allows the o-ring to rotate). The manual advises that if you can't rotate them, you probably messed up the o-ring.

And if you did that, I would expect leaking.

Good luck!

Last edited by scope103; 03-15-2019 at 09:01 AM.
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