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Old 08-05-2014, 02:00 AM   #1
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Strange rattling noise from engine bay

so im driving home one night from work and i hear a strange metal against metal sound..like cling cling clang. then i start hearing a weird low rattling noise from the front drivers side of the engine bay. around the valve cover and end of the headers. it only rattles when i accelerate and as i push the gas harder it gets louder. i notice that theres a hole on top that i'd never noticed before and it pushes warm air out on idle. i believe its at the end of the headers but its some pipe. ( im not sure what the part is or called) i dont know if that hole is supposed to be there but it looks like there are threads in it. i have some pics but it wont let me post attatchments
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Old 08-05-2014, 05:23 AM   #2
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Re: Strange rattling noise from engine bay

What year, what engine?

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94 Formula A3+1: 381ci all-forged stroker - Callies Stealth, Oliver 5.85 billet rods, BME nitrous pistons / CNC LT4 heads / Comp Cams custom solid roller / TH400 + GearVendors OD / Strange 12-bolt - 4.11's / 300-shot N2O / Spohn suspension / 6-pt roll bar with integrated SFC's / AutoMeter instrumentation / MoTeC M48Pro engine management system / a few other odds 'n ends. 800HP/800LB-FT at the flywheel.
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Old 08-05-2014, 11:23 AM   #3
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Re: Strange rattling noise from engine bay

I uploaded them
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Old 08-05-2014, 11:26 AM   #4
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Re: Strange rattling noise from engine bay

97 lt1
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Old 08-05-2014, 02:37 PM   #5
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Re: Strange rattling noise from engine bay

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I uploaded them
OK... now post a link to each photo you want us to look at in this thread. Or embed the images in a post with the [img] tags. There is a URL address in the box right below the picture that you can copy and paste.
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94 Formula A3+1: 381ci all-forged stroker - Callies Stealth, Oliver 5.85 billet rods, BME nitrous pistons / CNC LT4 heads / Comp Cams custom solid roller / TH400 + GearVendors OD / Strange 12-bolt - 4.11's / 300-shot N2O / Spohn suspension / 6-pt roll bar with integrated SFC's / AutoMeter instrumentation / MoTeC M48Pro engine management system / a few other odds 'n ends. 800HP/800LB-FT at the flywheel.

Last edited by Injuneer; 08-05-2014 at 02:44 PM.
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Old 08-05-2014, 02:44 PM   #6
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Re: Strange rattling noise from engine bay

And looking at your album, that is the connection on the header for the AIR pump discharge into the header. You either need a line from the AIR pump to a check valve, connected to that hole, or you need a plug in the hole to prevent exhaust from escaping, or air to be inducted. With it open, the noise you are hearing is a giant exhaust leak.

Make repairs rapidly, because that leak could cause the #1 cylinder exhaust valve to burn, and it's throwing off the A/F ratio seen by the O2 sensor, causing the PCM to add fuel the engine doesn't need.
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94 Formula A3+1: 381ci all-forged stroker - Callies Stealth, Oliver 5.85 billet rods, BME nitrous pistons / CNC LT4 heads / Comp Cams custom solid roller / TH400 + GearVendors OD / Strange 12-bolt - 4.11's / 300-shot N2O / Spohn suspension / 6-pt roll bar with integrated SFC's / AutoMeter instrumentation / MoTeC M48Pro engine management system / a few other odds 'n ends. 800HP/800LB-FT at the flywheel.
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Old 08-05-2014, 03:43 PM   #7
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Re: Strange rattling noise from engine bay

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Originally Posted by Injuneer View Post
And looking at your album, that is the connection on the header for the AIR pump discharge into the header. You either need a line from the AIR pump to a check valve, connected to that hole, or you need a plug in the hole to prevent exhaust from escaping, or air to be inducted. With it open, the noise you are hearing is a giant exhaust leak.

Make repairs rapidly, because that leak could cause the #1 cylinder exhaust valve to burn, and it's throwing off the A/F ratio seen by the O2 sensor, causing the PCM to add fuel the engine doesn't need.
So i shouldnt be driving it? Also i forgot to add i dont have catalytic converters does it make a difference ?
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Old 08-05-2014, 05:06 PM   #8
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Re: Strange rattling noise from engine bay

If you don't have a cat, you don't need the AIR system. First, with the engine running, verify that there is exhaust coming out of that hole. What you need ASAP is a threaded plug to close off the opening. Some headers use a 22mm oil drain plug, I think others use an 18mm drain plug.

My AS&M headers use a 22mm plug:

Click the image to open in full size.
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94 Formula A3+1: 381ci all-forged stroker - Callies Stealth, Oliver 5.85 billet rods, BME nitrous pistons / CNC LT4 heads / Comp Cams custom solid roller / TH400 + GearVendors OD / Strange 12-bolt - 4.11's / 300-shot N2O / Spohn suspension / 6-pt roll bar with integrated SFC's / AutoMeter instrumentation / MoTeC M48Pro engine management system / a few other odds 'n ends. 800HP/800LB-FT at the flywheel.
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Old 08-05-2014, 05:06 PM
 
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