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What do I need to check or replace?

Tiny
AHASTINGS88
  • MEMBER
  • 1998 CHEVROLET TAHOE
  • 208,413 MILES
I have a 98 chevy tahoe 4WD 5.7 liter engine. My trouble is a couple of weeks ago my tahoe started to idle rough then bogg down and stall, it also began to overheat.I had figured it might be my fuel filter so I changes it. The problem continued so I got the code checked and it said my problem was my coolant temperture sensor. I talked to a few people who usually help me with matinence on my tahoe and they said to try cleaning the throttle body, change out the coolant temperture sensor, thermostat, and the idle air control vavle. I have change and cleaned it all but the problem still persists. I am hoping that it isnt my fuel pump. Do you have any ideas on what I might need to do?
ive also noticed a coolant leak by the throttle body but I cant see where exactly its coming from
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Thursday, June 21st, 2012 AT 12:53 AM

5 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
What was the code number? Did anyone check for a vacuum leak?

Roy
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Thursday, June 21st, 2012 AT 12:57 AM
Tiny
AHASTINGS88
  • MEMBER
  • 3 POSTS
P0117 and everyone who usually helps is outta town so no one has checked for a vacuum leak.
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Thursday, June 21st, 2012 AT 1:05 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
117 is a coolant sensor code. Could be wiring, sensor, thermostat.

You need a shop with a scan tool to monitor the sensor voltage when it is cold and hot to see the actual readings.

Roy
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Thursday, June 21st, 2012 AT 1:14 AM
Tiny
AHASTINGS88
  • MEMBER
  • 3 POSTS
Ive changed the coolant temperture sensor and the thermostat. Could coolant system be my problem rather than anything to do with the fuel system?
Or am I trying to rule the coolant system out?
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Thursday, June 21st, 2012 AT 1:39 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Did it get tested before the replacement or did you just throw the part at it? You need freeze frame data to see the readings when the failure occurred. As you see, the sensor did not cure the issue and further diag time is required to find the fault.

Roy
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Thursday, June 21st, 2012 AT 1:47 AM

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