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p1258 code after ls1 swap

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Old Jun 6, 2005 | 09:24 PM
  #1  
pskel350's Avatar
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From: SW Michigan
p1258 code after ls1 swap

a real general description is "engine coolant temp high-fuel disabled"

i have no clue? the car will run and idle fine, but wont rev at all.
could it be just a shorted wire or a bad sensor. the scan tool just says 280* all the time, and the guage is pegged, even when you first start the engine.

anybody have any ideas where to start? to me it seams like a shorted sensor
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Old Jun 7, 2005 | 04:11 PM
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From: Vereinigten Staaten
Car: Take
Engine: Your
Transmission: Pick
High temperature indicates a short to ground. Either the sensor is bad or the wire is pinched/rubbed through somewhere. You mentioned that the ECM not only reads high, but the sensor is pegged. How do you have them wired up????? Are you using the '98s 3-wire sensor????
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Old Jun 7, 2005 | 10:05 PM
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From: SW Michigan
i believe its a two wire sensor. its stock for the 99 f-body

i didnt really change any wires around, just plugged in and went since im using a complete 4th gen harness, gauges, etc....

i will be looking at it tomorrow to figure it out, maybe its as simple as a bad sensor i hope
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Old Jun 8, 2005 | 08:46 PM
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From: Vereinigten Staaten
Car: Take
Engine: Your
Transmission: Pick
Unplug the coolant sensor and see if the computer reads -40°

If its does read that, then the wiring and computer are probably working and the sensor may be bad. If it still reads over 280, then you probably have a wiring or computer issue.
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Old Jun 12, 2005 | 08:24 PM
  #5  
xtremeirocz's Avatar
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From: Houston-katy
Car: 1986 Irocz- Houstons Fastest Street
Engine: 408 LS1 w/ 2 stage
Transmission: Turbo 350
Axle/Gears: 3:73,3850 lbs , best of 9.92 @ 138
i had a software issue in the ecm that gave me that code. after fighting it for a few days went and got a new ecm and problem solved. hope it isnt whats wrong here
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Old Jun 15, 2005 | 08:45 PM
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From: SW Michigan
finally got to spend a few minutes on it tonight, found the wire shorted to the dash frame its all good now though

thanks
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