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2001 GMC Jimmy wont start occasionally

Tiny
FRCHOMES
  • MEMBER
  • 2001 GMC JIMMY
2001 GMC Jimmy 6 cyl Two Wheel Drive Automatic

engine turns over will fire like the timing off. If I continue keep the starter turning it will start run rough and smooth out quickly. Items replaced, plugs, wires, cap & rotor, coil, ignition module, fuel pump, crank sensor and TPS. Also after the engine is hot it takes more cranking time befor the engine fires. It only does the rough start when the engine is cold. After replacing the TPS it has only done this one time in 4 weeks after it had sat for 2 days.
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Monday, June 21st, 2010 AT 3:10 PM

3 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Clean out the idle air control valve and check for low residual fuel pressure
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Tuesday, June 22nd, 2010 AT 1:42 AM
Tiny
KING_HILLBILLY
  • MEMBER
  • 2 POSTS
Another possibility is the temp sensor is sending inaccurate readings will cause the motor to take longer to start.
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Tuesday, July 13th, 2010 AT 8:03 PM
Tiny
RASMATAZ
  • MECHANIC
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Could also be the coolant temperature sensor not telling the computer to adjust for fuel during cold start ups while in open loop before the oxygen sensor take over the loop
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Tuesday, July 13th, 2010 AT 8:08 PM

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