Low power from engine

Tiny
ZACHBDA1
  • MEMBER
  • 1998 CHEVROLET TAHOE
  • V8
  • 4WD
  • AUTOMATIC
  • 135,000 MILES
What to do if a 1998 Chevy Tahoe want go over 5 miles a hour after replacing the fuel regulator?
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Saturday, December 18th, 2010 AT 9:13 PM

9 Replies

Tiny
MHPAUTOS
  • EXPERT
What was the initial problem that made you change the reg?

Mark (mhpautos)
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Saturday, December 18th, 2010 AT 11:05 PM
Tiny
ZACHBDA1
  • MEMBER
Well it starts up when cold and runs good just idle, then when I press my pedal it boggs out and want go over 5 miles a hour. So I went to get a test and the codes showed regulator and O2 sensors, so I also did a tune up on it as well and changed the fuel filter. So its still doing the same thing after all of this. Codes are not showing anything else. This thing runs bad when trying to move forward. HELP!
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Sunday, December 19th, 2010 AT 2:02 AM
Tiny
MHPAUTOS
  • EXPERT
Have you checked the fuel pressure, is the cat converter over heating, turning red?

Mark (mhpautos)
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Sunday, December 19th, 2010 AT 2:37 AM
Tiny
ZACHBDA1
  • MEMBER
Where would I look to see if it turns red?
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Sunday, December 19th, 2010 AT 4:07 AM
Tiny
ZACHBDA1
  • MEMBER
Fuel pressure is fine
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Sunday, December 19th, 2010 AT 4:09 AM
Tiny
MHPAUTOS
  • EXPERT
The cat converter, if they fail they collapse and block the exhaust, causing sever power loss and they do start to over heat and glow red.

Mark (mhpautos)
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Sunday, December 19th, 2010 AT 4:43 AM
Tiny
ZACHBDA1
  • MEMBER
But should I focus more on this fuel more?
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Sunday, December 19th, 2010 AT 4:17 PM
Tiny
MHPAUTOS
  • EXPERT
If you have good fuel pressure there is no issue there, do you have good flow rate, have you change the filter? Have you done a scan for any unresolved fault codes, is your reg controlled by vacuum? Is the vacuum supply OK, if vacuum operated, does the pressure alter with vac on and off?

Also try disconnecting the the exhaust system for the exhaust manifolds to relieve the output pressure and see if you get better power.

Mark (mhpautos)
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Sunday, December 19th, 2010 AT 10:17 PM
Tiny
KEN
  • ADMIN
Did you get the problem fixed, any word?
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Thursday, March 24th, 2016 AT 12:30 PM

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