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My yamaha warrior knocks real loud when at idle speed. valves look good. have some play n the crankshaft.

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Check the rings also oilpump

Posted on Jul 19, 2009

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I have a 1989 dodge caravan 3.0 and it got low on oil and started knocking i took the valve cover off and it has hydraulic lifters and one of them is real soft would this mean a bad one and the cause of...


Most probably the lifter has gone bad, but if it is a LOUD knocking sound, it is possible one of the crankshaft / connecting rod bearings has been damaged. Usually a bad valve gives more of a "clicking" sound.
A bad camshaft lobe will also cause a "knocking" sound usually with an engine with high mileage.

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Hi, Anonymous and the usual suspects are:
1. Severely discharged or a damaged battery, should have 12.5 volts or better and be able to pass a load test if necessary.
2. Failed alternator/generator and or voltage regulator.
3. Loose or corroded battery terminals and or cables especially the "NEGATIVE" cable, look for loose, corroded, or broken connectors inside the cable harness at "BOTH" ends.
4. Failed main circuit breaker or ignition switch, check for loose connections and continuity.
5. Failed system and or ignition relay, check for continuity.
6. Failed ignition coil, ignition/electronic module.
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9. Air/fuel mixture screw improperly adjusted.
10. Accelerator pump damaged or not working.
11. Water or dirt in the fuel system, carburetor or filter.
12. Restricted, blocked or kinked fuel line.
13. Fuel tank empty.
14. The gas cap is not venting properly or fuel tank venting system blocked.
15. Vacuum line from intake manifold to petcock broken, cracked, or not attached, carburetor vent line plugged.
16. Needle and seat stuck closed in the float bowl.
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Ok. Last night my car started making a knocking noise. Its not loud and only happens when im in idle. Also it seems to come from the bottom of the engine. Help?


if it gets louder and faster as the engine speed increases then a piston is knocking...if it is just at idle like you said then it could be a bad oil pump if oil light is on at idle or it could be the connecting rod knocking on the crankshaft because it is loose.

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2005 kia spectra wont start. throwing codes 1505, 1507 and an emissions evap. short code. what is the possible fix?


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The knock sensor will cause the ignition timing to ******, which will cause a lack of power, however, it's important that the engine camshaft/crankshaft timing was set properly when rebuilding the engine, if this is off, the engine will have no power and you could set the knock sensor code.

Hope thats help.

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