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Need help with bad whine at start up

 
Old 01-18-2019, 02:42 AM
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BurgerLord
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Default Need help with bad whine at start up

I hate to have my first post be a call for help but I'm new to the ZR1, I just replaced my fuel injectors and all went well until I tried to start it. As soon as it starts it jumps up to 3000 rpm and promptly dies, all the while it has a whining sound (serpentine belt?) it will keep running if I give it gas but something sounds like its rubbing and it does have a smell like hot rubber/plastic. Its most likely something stupid that I missed but any advice would be great.

Video of start up.
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Old 01-18-2019, 07:07 AM
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Rkreigh
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a few things that are common

injector o rings not seated, big vac leak
vac tree is brittle and can crack
check valves fail

search dynomite plenum pull diagrams as they are great

seek ye a brother of the beast to help

welcome!
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Old 01-18-2019, 07:30 PM
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BurgerLord
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Well, I have confirmed that the serpentine belt is not the problem, I guess it must be something wrong with the install of the injectors. What would cause them to make that noise?
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Old 01-18-2019, 09:33 PM
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Dynomite
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Originally Posted by BurgerLord View Post
Well, I have confirmed that the serpentine belt is not the problem, I guess it must be something wrong with the install of the injectors. What would cause them to make that noise?
I assume you removed serpentine belt and fired it up?
I think it is time to pull the plenum and check everything.

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Old 01-18-2019, 09:38 PM
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BurgerLord
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That's what I'm thinking, I did take the belt off and tried it but it changed nothing, I'm going to take the plenum off again and check everything, but I just don't know what could be causing that noise.
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Old 01-18-2019, 10:16 PM
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Dynomite
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Originally Posted by BurgerLord View Post
That's what I'm thinking, I did take the belt off and tried it but it changed nothing, I'm going to take the plenum off again and check everything, but I just don't know what could be causing that noise.
Exactly how did you replace the fuel injectors? and what fuel injectors did you use?
But......the whine sound seems like metal contact and not air whistle.
but since you pulled the belt..........it has to be air whistle which must be a Injector Housing Gasket leak or similar.

1991ZR1 (registry) has identified the best possibility being the Starter sticking regarding the whine.

You still have to remove Plenum to check vacuum leaks, MAP, Injectors, and now ...Starter and Valley Drain when you are there.

Last edited by Dynomite; 01-19-2019 at 12:10 PM.
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Old 01-19-2019, 05:19 AM
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Z51JEFF
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What State are you in and maybe a FaceTime chat with a member can help you out. Feel free to send me a
PM if I can help.
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Old 01-20-2019, 11:26 AM
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mhobtr
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You pulled the plenum, replaced the injectors, and nothing else?

Did you clean up the valley area while there?

How much coolant did you drain off and put back?

That does not sound like a vacuum leak but a pinched rubber vac line can make a weird noise. It sounds more like a motor or pump free spinning after throwing a gear or pulley.

Hope you're not looking for a missing cat that likes to crawl into places and hide.

Last edited by mhobtr; 01-20-2019 at 11:34 AM.
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Old 01-25-2019, 07:34 PM
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ZWILDZR1
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Since it wasn't running like that before the injector change it has to be something you have over looked. How did you bleed the system after you refilled the system? Wondering if you have an air lock? Also I would call Marc Haibeck and see if you can send him the video clip and let him have a listen. ( zr1specialist.com ) He's a great guy and very knowledgeable.
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