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marcus dunlap
marcus ... 3/15/2010
1991 Toyota Pickup DLX 4Cyl2.4L - Engine
rough idle and no power changed cap&rotor and plugs can remove #2or#3 plug wire and no change remove #1or#4 engine dies
5 Answers
  • RC
    RC 3/15/2010
    Sounds like you need to do a compression check. The head gasket may be blown between #2 and #3. Did you replace the plug wires also?
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  • marcus dunlap
    marcus dunlap 3/15/2010
    yes, how do i determine ablown head gasket?
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  • rstacruz
    rstacruz 3/15/2010
    Have you tried looking for an answer by searching Google?
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  • RC
    RC 3/15/2010
    Two adjacent cylinders with equal but low compression may indicate a blown head gasket between the two cylinders. Compare the compression readings to 1 and 4.
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  • germanxpert
    germanxpert 4/6/2010
    It could be injector wiring, grounding, or the computer. Cylinders 1 and 4 and cylinders 2 and 3 are companion cylinders and share injector drivers on batch fire injection systems. This means that companion cylinders get fuel injected at the same time, while one piston is on the power stroke the other is on the intake stroke, so the injector on one cylinder is spraying on the back of the intake valve while it's open and on the other cylinder the injector is spraying on a valve that is closed. Check the temperature of the middle two cylinders exhaust pipes on the manifold with a temperature gun and compare them to the outer two. Also if you have access to a noid light unplug an injector and plug in the light to see if the injectors are getting any power.
    Hope this helps, let me know.
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