'98 K1500 whistle/whine from top of engine
May 3rd, 2020, 7:44 AM
#11
CF Veteran
I changed the IAC but the whine got worse, but the engine ran better, much more responsive.
If you put a stick to the ear to the black box on top of the
throttle body behind the bore and under the resonator, the whine seems to be coming from there very loudly.
This just recently started on my 99 Suburban,
so need some info on that black box. Mine also seems to go higher after killing the engine, strange.
If you put a stick to the ear to the black box on top of the
throttle body behind the bore and under the resonator, the whine seems to be coming from there very loudly.
This just recently started on my 99 Suburban,
so need some info on that black box. Mine also seems to go higher after killing the engine, strange.
That’s a resonating chamber to help reduce noise. If there’s no cracks in it, the boot attaching it to the intake can definitely leak and would cause noise a whistle or whining noise.
May 3rd, 2020, 7:53 AM
#12
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Whine
Not the resonating box, but underneath it attached to the throttle body. A black plastic cover about 3”x1 1/2 with a harness running into it. This is where I am picking up the highest volume of the whine with stick to the ear.
May 3rd, 2020, 12:50 PM
#13
CF Veteran
That’s the connector and main body for the fuel injector assembly. There’s an o-ring that seals it. The upper intake will have to come off to replace it. If you’re not sure the injectors have been replaced, buy a new or reman unit and have it ready to go - these assemblies have multiple known problems with age and mileage.
The new/reman units are expensive but keep in mind that any scrap yard replacement will have the same problems. The primary issue is the lines break (especially during service) and then liquid fuel just gets dumped into the intake causing misfires and flooding. If you only want to take it apart once then have a quality replacement ready to install.
The new/reman units are expensive but keep in mind that any scrap yard replacement will have the same problems. The primary issue is the lines break (especially during service) and then liquid fuel just gets dumped into the intake causing misfires and flooding. If you only want to take it apart once then have a quality replacement ready to install.
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