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Fuel or spark issue

Tiny
GARY M AGNEW
  • MEMBER
  • 1995 GMC TRUCK
  • 5.7L
  • V8
  • 4WD
  • AUTOMATIC
  • 200,000 MILES
GMC k1500. No o2 sensor or cat headers. When I am driving and its wet it acts like it is loosing fuel or spark it is random when it is dry no issues. New plugs wires cap rotor fuel pump and filter. I am stumped.
Thursday, January 23rd, 2020 AT 8:02 PM

1 Reply

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good morning,

Are you still using the ECM? Without the O2 sensor, there is no signal from the exhaust for fuel control.

The MAP sensor may be the issue as it is dependent on atmospheric pressure.

Is the check engine light on?
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Friday, January 24th, 2020 AT 5:27 AM

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