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1994 Chevrolet Truck lost power

Tiny
CSA1
  • MEMBER
  • 1994 CHEVROLET TRUCK
  • 5.7L
  • V8
  • 4WD
  • AUTOMATIC
  • 266,000 MILES
Was driving home, truck was running fine, suddenly it started to act like it lost power. Ran they wy for 3 or 4 miles then suddenly took off like a rocket & had all kinds of power. Ran fine again for a few miles, then back to no power. Stomped the gas, it kicked down but lacks power badly. I replaced the MAP & EGR in it a few months back & it also got a new fuel pump, so ruling those out for moment. Im stumped at the moment. Showing codes 33 & 44, which I know are MAP & O2, MAP was replaced 2 months ago.
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Sunday, August 9th, 2015 AT 3:57 PM

6 Replies

Tiny
RIVERMIKERAT
  • MECHANIC
  • 6,110 POSTS
Check fuel pressure. When was the last time you had the fuel system cleaned?
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Sunday, August 9th, 2015 AT 5:30 PM
Tiny
CSA1
  • MEMBER
  • 78 POSTS
Fuel system was cleaned 6 months ago when new fuel pump was put in. Just changed fuel filter again 15 minutes ago. Fuel pressure is at 13 PSI
thinking it's map sensor again, acts just like it did last time it went bad. Will be 4th map sensor I put on in last year, no idea whats eating them up
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Sunday, August 9th, 2015 AT 5:56 PM
Tiny
RIVERMIKERAT
  • MECHANIC
  • 6,110 POSTS
Check all the wiring to and from and between. It sounds like an electrical issue is causing the sensor to fail. Check all connectors. Is it the original ECM?
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Sunday, August 9th, 2015 AT 9:05 PM
Tiny
CSA1
  • MEMBER
  • 78 POSTS
ECM was replaced when fuel pump was changed. Bout 6 months old
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Monday, August 10th, 2015 AT 10:11 AM
Tiny
CSA1
  • MEMBER
  • 78 POSTS
We replaced the MAP sensor & it runs ok again, still has a slight miss at idle though
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Monday, August 10th, 2015 AT 10:12 AM
Tiny
RIVERMIKERAT
  • MECHANIC
  • 6,110 POSTS
Slight miss could be a loose connection, bad plug or wire, or a coil going out.
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Monday, August 10th, 2015 AT 12:29 PM

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