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1995 Chevy S-10

Tiny
BIVENS6
  • MEMBER
  • 1995 CHEVROLET S-10
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 94,000 MILES
1995 Chevy s10 2wd 4.3 Vortec Vin "W", starts, idles fine, seems to be "pulsating" or "loping" once under load in drive just over 30mph. Fuel pressure ranging @ 55-60psi consistantly, new fuel pump and filter, but when it starts to "pulsate" the tach also gets jittery and jumpy not steady fluctuating 300-500rpm. If you "get on it" it will bog down and very slowly gain speed and power while rpms jump to almost redline? This all of a sudden started the other day while going down the freeway at 65mph no precursors to this "problem". Any ideas. I have seen some websites stating EGR possibilities or plugged Catlytic problems. Is there a way to test the Cat? Or EGR?
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Sunday, October 24th, 2010 AT 5:36 PM

1 Reply

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Could also be the throttle position and manifold absolute pressure sensors-For the Cat disconnect the exhaust pipe on the exhaust manifold and see what happens, For the EGR valve you have to activate the EGR valve for it to open-if you do and the RPM is not dropping as you open it-there's a problem with it.
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Sunday, October 24th, 2010 AT 5:45 PM

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