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1999 Chevrolet Suburban Hot Floorboards

Tiny
CHEVYSUB99
  • MEMBER
  • 1999 CHEVROLET SUBURBAN
  • 5.7L
  • V8
  • 4WD
  • AUTOMATIC
  • 185,000 MILES
The Check Engine Light Came On, We Had Htr Code, O2 Code, Lean Bank 1 And 2. We Also Had Maf So We Changed All Those Parts Plus Cats. After Changing All Of Them The Floor Board Is Still Hot And Now Running Rich. Plus The Floor Is Still Hot On Passenger Side. Checked The Map Senser And Voltage Is 5 Volts To It And 1 Volt At Idle So If You Could Please Help.
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Tuesday, September 2nd, 2014 AT 6:59 PM

12 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,755 POSTS
Is the catalytic converter getting red hot? Also, since you replaced everything, has the check engine light come back on? Any new codes?
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Tuesday, September 2nd, 2014 AT 7:30 PM
Tiny
CHEVYSUB99
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  • 7 POSTS
The Catalytic Converter Is Not Red. The Check Engine Light Came On. Codes 172 & 175.
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Tuesday, September 2nd, 2014 AT 8:40 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,755 POSTS
The engine is getting too much fuel. Have you checked fuel pump pressure to confirm pressure is within the manufacturer's specs? A bad regulator can allow too much pressure to build which can result in a rich mixture.
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Wednesday, September 3rd, 2014 AT 4:55 AM
Tiny
CHEVYSUB99
  • MEMBER
  • 7 POSTS
I will check pressure from pump, thank you. I didn't think there would be a problem there since we have changed the pump as well but was wondering about the fuel regulator. Do I need to worry about the injectors?
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Wednesday, September 3rd, 2014 AT 8:03 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,755 POSTS
The injectors could be leaking. Start with pressure. Make sure the regulator is working. Also, there is a vacuum hose to the regulator. Remove it and make sure there is no gas in it.
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Wednesday, September 3rd, 2014 AT 8:40 AM
Tiny
CHEVYSUB99
  • MEMBER
  • 7 POSTS
Sorry I was just wondering how do I check fuel pressure past the regulater or will the leak down test work for what your saying. I believe the regulater is in the intake manifold if I'm right. Thanks again
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Wednesday, September 3rd, 2014 AT 5:23 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,755 POSTS
Pressure before and after the regulator should be the same. The regulator maintains a specific pressure in the fuel rail regardless of location. Here is a video of a fuel pressure / regulator test being done on a vehicle like yours. Let me know if it helps.

https://www.2carpros.com/articles/testing-a-fuel-pump-and-pressure-regulator-video
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Wednesday, September 3rd, 2014 AT 8:02 PM
Tiny
CHEVYSUB99
  • MEMBER
  • 7 POSTS
OK, checked pressure and with key on engine of it hits 60 and falls to 54 and with engine on it holds at 54. When you rap on the gas it jumps to 60 and when you hold gas at 2000 rpm it holds at 55. With key off it holds pressure for about 2 min and starts falling off very slowly to 35 and will hold again for a period of time. I did find a pin hole in exhaust before cat 2 and will fix Monday morning, anything on the fuel pressure you might have?
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Sunday, September 7th, 2014 AT 10:03 AM
Tiny
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When you removed the vacuum supply to the regulator, was there any fuel in it?

Other than that, fuel pressure seems good. Have you checked the coolant temp sensor?
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Sunday, September 7th, 2014 AT 8:32 PM
Tiny
CHEVYSUB99
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  • 7 POSTS
I Don't Have A Vacuum Line To My Regulator To Check Because It Is In My Intake So No I Didn't Do That. I Did Look Through The Throttle Body Into The Intake To See If There Was Any Fuel And Didn't See Or Smell Any So I Don't Think There Is A Problem There. I Did Check The Ect And I Had About 900 Ohms At Cool And About 230 At Running Temp So It Seems To Do It's Job. Should My Pressure Be Higher Or Is That In The Range, I've Read 55-60 And 60-66 Psi So Im Undecided About What To Do There On The Pump. Thanks For The help
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Sunday, September 7th, 2014 AT 9:03 PM
Tiny
JACOBANDNICKOLAS
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No, the pressure seems okay. The last thing left for a rich mixture would have to deal with the injectors. I question if they are leaking.
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Monday, September 8th, 2014 AT 4:59 AM
Tiny
CHEVYSUB99
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  • 7 POSTS
I don't know I guess after the exhaust leak is fixed today I can carry through with that. I thought the pressure check holding the pressure would tell me that answer. Thanks for The
help
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Monday, September 8th, 2014 AT 5:08 AM

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