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Burning smell


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#1 KnightOwl

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Posted 12 January 2018 - 03:19 AM

When I first brought my car home I noticed a slight burning smell after a while highway driving. I thought at first it was just dressing the detalier had used under the hood to pretty things up, but by now I thought that would be gone.

 

I have looked closely under the hood and nothing is smoking in the slightest, and I've used a mirror to get a close look at the rear manifold to be sure oil isnt leaking from the valve cover, but everything looks clean.

 

Any other culprit ideas?


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#2 bluegtp91

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Posted 12 January 2018 - 03:21 AM

Description on the smell? How long has it been since they “dressed” or cleaned the bay? Some of that cleaner stays in there for a hot minute.
1999 Chevrolet Silverado K1500 Classic Z71 - Intake/Gibson Exhaust/HID's/Tint  
2004 Chevrolet Corvette MRM A4 - AFE S2 Intake/TSP Catless LT's/3" ORX/C6 ZR1 Wheels/Exhaust Tips
2012 Buick Regal T - Intake/HID's/Tint
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#3 KnightOwl

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Posted 12 January 2018 - 02:08 PM

No clue how long the car had been cleaned/detailed before I bought it,(12/12/2017) but some things under the hood are still shiny (hoses, airbox) The smell is oil or plastic...like its cooking on the exhaust pipe someplace

2002 Grand Prix GT 

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#4 bluegtp91

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Posted 12 January 2018 - 02:41 PM

I'd cover up the alternator and air filter (if it's exposed, if not you're fine)...leave it running and take it to a car wash and blast the sh1t out of that engine bay.  Take the engine cover off as well.

 

See if that helps the cause if you haven't done that yet.  I'd check the exhaust though (maybe even the o2 harness to the manifold) to see if anything happens to be making contact.  Could even be under the car, too.  If it's stock the o2 in the U-Bend might be the culprit.  The harness is clipped up to the body and that could have came apart; thus laying on the downpipe.

 

Granted it's always hard to diagnose stuff over a keyboard...but that's what I'd do next.


1999 Chevrolet Silverado K1500 Classic Z71 - Intake/Gibson Exhaust/HID's/Tint  
2004 Chevrolet Corvette MRM A4 - AFE S2 Intake/TSP Catless LT's/3" ORX/C6 ZR1 Wheels/Exhaust Tips
2012 Buick Regal T - Intake/HID's/Tint
Previous W-Body's: '98 SM GT Coupe, '98 TDGM GTP Coupe, '03 BBM GTP Sedan, '05 DCM GXP
 

#5 Grandprix1

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Posted 12 January 2018 - 07:32 PM

I’d be damn careful blasting water at stuff under the hood. But maybe that’s just me.

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Mods: Cold Air Inductions Sealed Air Intake, Performance Shift, ZZP Downpipe (Catted), Tune, Front and Rear STB, ZZP Throttle Body Heat Shield, Impala SS Brakes, 180* T-Stat, 

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#6 Imp558

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Posted 12 January 2018 - 07:40 PM

I’d be damn careful blasting water at stuff under the hood. But maybe that’s just me.

 

I'm not.

 

I grab a 1/2 dozen cans of generic scrubbing bubbles bathroom cleaner from the dollar store and hose everything down with that stuff at the car wash, then just start the car and let it idle while I pressure wash it.

Things steam for like an hour while the pool on the intake evaporates.


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#7 walterdude

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Posted 12 January 2018 - 08:25 PM

This might sound a bit weird, BUT.... One time in my 99 Lumina I had a burning smell and a little smoke I think... Turns out when I was parked at Costco the wind blew a plastic bag under my car and it melted onto the exhaust pipe... I could still smell it even when all visible signs were gone...

Good luck.

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#8 vipmiller803

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Posted 12 January 2018 - 08:32 PM

I have looked closely under the hood and nothing is smoking in the slightest, and I've used a mirror to get a close look at the rear manifold to be sure oil isnt leaking from the valve cover, but everything looks clean.

I would check this and check again. Don't want another 3800 barbecue on our hands.

 

Ideas above are good candidates.

 

Stuck calipers can cause a smell on extended drives also. 


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#9 Imp558

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Posted 12 January 2018 - 09:14 PM

Don't want another 3800 barbecue on our hands.

 

I just ordered Valve cover gaskets for the SSEi lol. Starting to catch a whiff with harder braking.


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"If everything seems under control, you're not going fast enough"  - Mario Andretti

 

1996 Buick Regal L67/4T65E-HD swapped - 1995 Buick Regal GS - 1980 Dodge Sno-Commander - 1968 Empi Imp on '67 Pan - 2001 Chevrolet Express 3500

 

Her Stuff: 1996 SSEi - 2001 Monte Carlo SS


#10 bluegtp91

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Posted 12 January 2018 - 09:20 PM

I’d be damn careful blasting water at stuff under the hood. But maybe that’s just me.

 

Been doing it for a long time.  On MANY cars.  I'm not telling you to stick a pressure washer point blank to the entire engine compartment; just be smart about it.


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1999 Chevrolet Silverado K1500 Classic Z71 - Intake/Gibson Exhaust/HID's/Tint  
2004 Chevrolet Corvette MRM A4 - AFE S2 Intake/TSP Catless LT's/3" ORX/C6 ZR1 Wheels/Exhaust Tips
2012 Buick Regal T - Intake/HID's/Tint
Previous W-Body's: '98 SM GT Coupe, '98 TDGM GTP Coupe, '03 BBM GTP Sedan, '05 DCM GXP
 

#11 Imp558

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Posted 12 January 2018 - 09:23 PM

 I'm not telling you to stick a pressure washer point blank to the entire engine compartment; just be smart about it.

 

Seriously, lol, I literally do that routinely. I don't spray a battery, electrical center or alternator directly though.


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"If everything seems under control, you're not going fast enough"  - Mario Andretti

 

1996 Buick Regal L67/4T65E-HD swapped - 1995 Buick Regal GS - 1980 Dodge Sno-Commander - 1968 Empi Imp on '67 Pan - 2001 Chevrolet Express 3500

 

Her Stuff: 1996 SSEi - 2001 Monte Carlo SS


#12 KnightOwl

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Posted 12 January 2018 - 09:48 PM

Seriously, lol, I literally do that routinely. I don't spray a battery, electrical center or alternator directly though.

I honestly think that's exactly what was done to the car because I've NEVER seen a car that old SO clean under the hood. The plastic bag thing could easily be a thing...I need to get the car on a lift anyway to check things out.

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"All we know is...its NOT The Stig, but the Stig's fat American Cousin!"

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#13 bluegtp91

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Posted 12 January 2018 - 10:00 PM

Seriously, lol, I literally do that routinely.

 

I'm hoping that I'm not the only one that just imagined someone standing on the core support just hammering the engine with a pressure washer at the car wash, while yelling things.

 

Classic.


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1999 Chevrolet Silverado K1500 Classic Z71 - Intake/Gibson Exhaust/HID's/Tint  
2004 Chevrolet Corvette MRM A4 - AFE S2 Intake/TSP Catless LT's/3" ORX/C6 ZR1 Wheels/Exhaust Tips
2012 Buick Regal T - Intake/HID's/Tint
Previous W-Body's: '98 SM GT Coupe, '98 TDGM GTP Coupe, '03 BBM GTP Sedan, '05 DCM GXP
 

#14 Imp558

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Posted 12 January 2018 - 10:29 PM

I'm hoping that I'm not the only one that just imagined someone standing on the core support just hammering the engine with a pressure washer at the car wash, while yelling things.

 

Classic.

 

That's not far off the mark, and bathroom cleaner bubbles getting blasted around.


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"If everything seems under control, you're not going fast enough"  - Mario Andretti

 

1996 Buick Regal L67/4T65E-HD swapped - 1995 Buick Regal GS - 1980 Dodge Sno-Commander - 1968 Empi Imp on '67 Pan - 2001 Chevrolet Express 3500

 

Her Stuff: 1996 SSEi - 2001 Monte Carlo SS


#15 KnightOwl

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Posted 12 January 2018 - 11:00 PM

ROFLMAO!!!

2002 Grand Prix GT 

"All we know is...its NOT The Stig, but the Stig's fat American Cousin!"

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#16 Imp558

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Posted 12 January 2018 - 11:05 PM

It works awesome, we had a barrel of commercial cleaner at my old shop in the pressure washing bay but nobody used it. We would get cases of bathroom cleaner from the dollar store.


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"If everything seems under control, you're not going fast enough"  - Mario Andretti

 

1996 Buick Regal L67/4T65E-HD swapped - 1995 Buick Regal GS - 1980 Dodge Sno-Commander - 1968 Empi Imp on '67 Pan - 2001 Chevrolet Express 3500

 

Her Stuff: 1996 SSEi - 2001 Monte Carlo SS


#17 Grandprix1

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Posted 12 January 2018 - 11:46 PM

Don’t get me wrong I use one to clean mine and you could preform surgery in my engine bay with how clean it is. But just blasting things with water doesn’t sound like a good idea. I just use a very light spray Sent from my iPhone using Tapatalk

2002 Grand Prix GT

Mods: Cold Air Inductions Sealed Air Intake, Performance Shift, ZZP Downpipe (Catted), Tune, Front and Rear STB, ZZP Throttle Body Heat Shield, Impala SS Brakes, 180* T-Stat, 

Appearance Mods: Silver Grand Prix Badges, Rear inlay Decals, Red Brake Calipers, Special Edition Exhaust Tips, Always Clean?

Carlisle GM Nationals 1st Place Grand Prix Stock June 17th-19th 2016

Carlisle Chevy Nationals 2nd Place Grand Prix June 23rd-25th 2017

Kpjduvq.jpg


#18 KnightOwl

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Posted 13 January 2018 - 12:51 AM

I don't think the water will really hurt anything just spray since the vehicle is designed to withstand harsh weather conditions. BUT, I do know any kind of cleaner with the same active ingredient as 409 is bad JuJu...that stuff attacks wires and make plastic insulation go crusty. Not to mention staining the dickens out of anything polished aluminum.


2002 Grand Prix GT 

"All we know is...its NOT The Stig, but the Stig's fat American Cousin!"

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#19 WarMachine

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Posted 13 January 2018 - 01:39 AM

Leaking valve cover, maybe exhaust leak.

 

 

 

Don't blast water onto your engine if you dont know what you're doing. You'll end up with a smelly car that doesn't turn on.

 

 

 

Like my old dodge. seriously f that car


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#20 KnightOwl

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Posted 13 January 2018 - 02:23 AM

If I recall, I thought I started smelling something burning...right before the cat plugged up


2002 Grand Prix GT 

"All we know is...its NOT The Stig, but the Stig's fat American Cousin!"

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