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11-27-2024, 08:30 PM
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#1 |
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Registered User
Join Date: Jun 2009
Location: COOKEVILLE,TN
Posts: 150
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Limp mode, '97 2500 454 Suburban
Sometimes it goes to limp mode but no engine light. Sometimes I can restart and it's OK. Today I unplugged the battery, and it worked....Could it be fuel pump?
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11-29-2024, 01:10 PM
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#2 |
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Registered User
Join Date: Aug 2012
Location: Northeast KS
Posts: 1,788
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Re: Limp mode, '97 2500 454 Suburban
What is limp mode, and what are the symptoms?
Typically a fuel pump on its way out works better with the tank full of fuel and before it heats up. Easy to test fuel pressure at the port with a gauge. What is the condition of battery cables, your grounds, when was the last tuneup?
__________________
1999 GMC Suburban K2500 SLT, 454/4L80E 1991 Z/28, 6.0L/T56 1949 GMC 250, S10 Frame, 6.0L/4L80E Instagram @aceshighspeedshop |
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11-29-2024, 04:37 PM
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#3 |
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State of Confusion!
  
Join Date: Jul 2002
Location: Gulfport, MS USA
Posts: 47,220
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Re: Limp mode, '97 2500 454 Suburban
Never had one of these years go into limp mode and have had fuel pumps and distributors die on me. With the fuel pumps it just quit and would not go again. Distributor just ran like poo, or if it was module it just died.
I amjust guessing. That limp.mode on these earlier years would be throttle body related, but that is just a guess..
__________________
Bill 1970 Chevy Custom/10 LWB Fleetside 2010 Toyota Tacoma PreRunner SR5 Double Cab - DD Member of Louisiana Classic Truck Club (LCTC) Bill's Gallery Life isn't tied with a bow, but it's still a gift. Live simply. Love generously. Care deeply. Speak kindly. Leave the rest to God! |
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11-29-2024, 04:55 PM
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#4 | |
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Registered User
Join Date: Aug 2012
Location: Northeast KS
Posts: 1,788
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Re: Limp mode, '97 2500 454 Suburban
Quote:
Black box isn't super advance but it is a step above OBD1 TBI stuff and if there is a problem, chances are there may be some pending or stored codes.
__________________
1999 GMC Suburban K2500 SLT, 454/4L80E 1991 Z/28, 6.0L/T56 1949 GMC 250, S10 Frame, 6.0L/4L80E Instagram @aceshighspeedshop |
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11-30-2024, 01:20 PM
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#5 |
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Registered User
Join Date: Jun 2009
Location: COOKEVILLE,TN
Posts: 150
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Re: Limp mode, '97 2500 454 Suburban
It may not be "limp mode", it just will not take gas and barely move. First time it did it was low on transmission fluid, filled it up and was find, transmission never slipped. Few months later did it again but transmission level was fine, turned it off and started it back and it was fine. Last time turning it on and back on a couple of times did not work, unhooked the battery and it worked fine. Have not used it since and it's too cold to run a scan right now. Thanx for the input.
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12-05-2024, 01:42 PM
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#6 |
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Registered User
Join Date: Feb 2023
Location: Nunya Bizz
Posts: 81
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Re: Limp mode, '97 2500 454 Suburban
I bet it’s the throttle position sensor(TPS)
__________________
____________________________________ 1968 Chevrolet C-30 327 4spd flat bed dually 157" WB 1997 Chevrolet k1500 5.0 auto ECSB |
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12-05-2024, 08:44 PM
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#7 | |
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Registered User
Join Date: Jun 2009
Location: COOKEVILLE,TN
Posts: 150
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Re: Limp mode, '97 2500 454 Suburban
Quote:
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