03-20-2019, 08:18 PM | #1 |
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tell tale signs
ok guys need some expert help, my trucks started to make a whistling noise
sometimes not all the time and then dies down when i slightly rev the motor this a injector going bad? or vac leak on tbi gasket? as it sounds like its coming from tbi.. truck seems to be still running ok .. |
03-21-2019, 08:35 AM | #2 |
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Re: tell tale signs
Try to find a way to recreate the noise, then use a stethoscope to pin point the noise.
For vac leaks, you can spray down the area with carb cleaner and listen for a change in RPM.
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05-03-2019, 05:31 PM | #3 |
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Re: tell tale signs
probably the TBI gasket. Mine did the same thing.
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05-09-2019, 04:41 PM | #4 |
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Re: tell tale signs
ok any videos on gasket replacement? never done this before easy job guys ?
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05-10-2019, 06:19 AM | #5 |
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Re: tell tale signs
Verify that's where the leak is first. If it is, make sure the bolts holding the TB down are torqued to spec. If that doesn't work, it should be just pulling off the TB, pull put the gasket, clean up the surfaces, put it back together. Don't let anything fall down the intake.
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05-10-2019, 09:34 AM | #6 |
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Re: tell tale signs
Using carb cleaner safe while engine is cold? Makes me nervy
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05-10-2019, 10:18 AM | #7 |
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Re: tell tale signs
The test for a vacuum leak is to spray carb cleaner around the gasket area while the engine is running to listen for a change in RPM. No issues with ignition, even on a hot engine.
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05-19-2019, 12:38 PM | #8 |
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Re: tell tale signs
engine rpm increase or die down if carb cleaner hits leak?
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05-20-2019, 07:10 AM | #9 |
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Re: tell tale signs
increase
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05-24-2019, 11:57 PM | #10 |
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Re: tell tale signs
got the tbi off wow it is indeed the gasket its toast, crumbled right off like nothing, got nice new one to install, also need to renew the idle air valve connector as that broke right off , plastic was so bad on it.
also renew fuel line o rings. |
06-11-2019, 01:54 PM | #11 |
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Re: tell tale signs
truck runs like a champ now sounds better as well.. brilliant thx to all who helped us.
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06-11-2019, 02:14 PM | #12 |
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Re: tell tale signs
Glad to hear you got it working!
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