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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  • Chevrolet Master
  • 641 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

  • 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

  • 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

  • 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.


Posted on Feb 03, 2011

  • 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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What is the factory specified max. compression, new motor, GM 4.3 ltr, V6

Interpreting the Results
of the Engine Compression Test.The idea behind the Engine Compression Test (in the case of a Misfire Condition or Rough Idle Condition) is to find out if any one engine cylinder is not contributing 100% of its power to the overall engine output. If only one cylinder has lower than normal compression, your GM 4.3L (or 5.0L, 5.7L) equipped vehicle will run rough or cause a Misfire Code to set and turn on the Check Engine Light.
So then, to wrap things up, the individual cylinder compression readings of each engine cylinder can not vary more than 15%... and this is how you can find out:
  1. 1Grab a calculator and multiply the highest compression reading that you recorded by .15.

    So, let's say that cylinder #4 gave you the highest reading of 170 PSI. Well 170 X .15 gives you 26 (25.5 rounded off).
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valve or head gasket for that low cylinder take it that your measurement is in bars -- the 12 bars is 170 psI very good and the 9 bars is 130 psi
as it is good practice to allow only 10% difference between cylinders the 130 psi (9) is a problem cylinder
One possible fix is to check and adjust the tappet clearance or have that cylinder hydraulic followers checked for operation
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Per the Ford manual, the acceptable range is 155-195 PSI. It sounds to me like you don't have a compression issue with this engine (without knowing the exact readings for each cylinder). Normally one cylinder being higher than the others, but still within spec, would not concern me a lot. Had one been much lower, then I think that might be cause for concern. There could be many reasons for the one hole being higher. If the engine hasn't been rebuilt in a long time, there could be carbon deposits in the compression chamber. There are many chemical fixes for this availble at your local parts store. If the engine is running fine with no pinging or detonation, I'd just continue to enjoy your classic ride (I own a 1971 Challenger converitble with a 440-6 pack, so I understand the joy of a classic car!).

Good luck and please let me know if this helps!


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Security system/battery

plz check the following and update me
1. Fuel (To be exact proper air/fuel ratio, normally it is about 14/1)
2. Spark (in appropriate moment)
3. Proper timing (the valves should open and close only in appropriate time)
4. Compression in the cylinders (Normal compression is 120 - 170 psi. The engine won't start if the compression is lower than 70 - 80 psi.)

Jul 14, 2008 | 1997 Honda Accord

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