Question about 1997 Chevrolet C/K 3500

1 Answer

My truck feels like it dropped a cylinder or two.

Its a 454 and I checked my compression, and all are 170 PSI or so. Any thoughts?

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  • HD Prescott
    HD Prescott Jan 20, 2013

    I just did a tune up 3 weeks ago. She was running good until the other day after I passed someone on the highway

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1 Answer

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  • Chevrolet Master
  • 632 Answers

Spark plugs (cracked or carbon tracking, fouled), wires leaking voltage or arching, distributor cap (carbon tracking) where the spark arks inside the cap and doesn't make it to the plugs. The poppet valves may be clogged.

Posted on Jan 20, 2013

  • HD Prescott
    HD Prescott Jan 20, 2013

    I just did a tune up 3 weeks ago. She was running good until the other day after I passed someone on the highway

×

5 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

  • 42 Answers

SOURCE: low compression in 2 cylinders

also check for cracked block ... not common but does happen

Posted on Mar 16, 2009

urnuts73
  • 210 Answers

SOURCE: 1998 chevy k3500. Has spark, Compression in all

Hi im really a ford man but all engine need 4 things to run
1. Spark (you checked that)
2. fuel (you checked that)
3. Compression (and you checked that)
4. Timing ( Check crank shaft sensor and timing belt )
how was it running before the no start condition
get back to me
give feed back if you can
hope this helps FixYa

Posted on Jan 29, 2011

snowghost1
  • 784 Answers

SOURCE: my 1989 gmc 3500 truck

no compression means that a valve is stuck open / broken / or worn,, or piston rod is no longer connected ( broken ),,, or piston rings are totally worn out,, could also be a bad valve spring. start by removing the valve cover and inspect the valves on cylinder #1. if valves look intact then the next step is to remove the head,, at this point it should be very obvious what is wrong. could be a good time to re-build the motor at that point,, it is a great motor and it is worth re-building,,, it will give you years and years of service.

c...

Posted on Feb 03, 2011

reaperautomo
  • 206 Answers

SOURCE: Lost compression and now there is a loud knocking noise in my 454 vortec engine

Bent valves would be number one cause. Check the timing. If you lost time, your valves are tapping the pistons causing the knock. When the valves tap the pistons they bend and don't close all the way, so the cylinders cant make compression.

Posted on Oct 17, 2012

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