Question about 1998 GMC Sierra

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1998 GMC sierra 5.7 warms up to violent shut down

Replaced craked heater core,cylinder heads, water pump, timing chain, and tune up. Also new IAC, fuel and airfilter, ECM module, both coolant sensors,thermostat, coollant, and alternator. after start up the engine runs smoothly but soon after it warms up ( guage shows 190ish ) the engine will violently stall. I replaced the coolant sensors and the guage showed the engine was over 260 quickly. I didn't quite trust it though and replace it again new one shows the engine goes to 200 then drops back to 160 repeatedly. After driving for 5 or 6 miles the engine starts to stall violently and then quits. If it is overheating what is causing it and why won't the gauge indicate it?

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  • haulin69gto Feb 09, 2009

    When you refer to the ECM you're talking about the computer right? If so I had just about come to that conclusion as well. Is there a way to test it before just replacing it?



    Thanks!

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I Would Look Into ECM Probled As It Takes over when the Engine reaches 195-220 Deg the ECM Takes Charge of Timing ETC.

Posted on Feb 09, 2009

  • 1 more comment 
  • Ronnie Wilson Feb 09, 2009

    Correct ECM PCM all the same - Just So As NOT to Mistake it for BCM Body Control Module

  • Ronnie Wilson Feb 09, 2009

    No test Exept The Unconventional SMACK It when It Starts to Run Rough, You Also Might Check Your Ground to The ECM. There are Just Too Mant Curuits In them To Test.

  • Ronnie Wilson Feb 09, 2009

    ease Dont Forget to RATE Me !!!! Thank YOU

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