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Rattling high rpm

Valves rattling under load, high rpm

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How do I fix an engine rattle at low rpm, light load, city speeds? The spark plugs aren't due for replacement yet, should I be going after an exhaust sensor?

Depends on your definition of rattle. Engines don't rattle unless something is loose or a rock has landed in a cooling hole on the side of the catalytic converter. So , if you can give us a better description of what the engine is doing, you'll get a load of incorrect answers.

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2005 Dodge Ram 1500 4.7 Engine. Starts fine, Idles fine, but when engine shifts into high gear and RPM lowers engine runs really rough under load

Have you checked for a broken valve spring. Repaired a dodge engine with the same running issue as you have described and it was a broken intake valve spring.

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My 2005 pontiac grand prix is making a rattling sound at 1500-2000 rpm under a load.

Ignition system is not correctly timed. Set Base Time. ..If correct advance 5 degree see if this improves.... higher octane gas.and fuel system cleaner.. carbon build up in valve train

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1996 vs v6 holden commerdore miss under load at high rpm

check for collapsed catalyic converter innards as it will block the exhaust ( most noticeable at revs) tap the outside case with the heel of the hand and if ti rattles it may be your problem

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Rattling noise sportage 2008

Sorry for the late reply but, no, it is not related to a loose heat shield. It is a louder rattling sound more like a loose bearing vibrating inside either the transmission or the clutch assembly. Only between 1600 and 1900 rpm. and it is not present under ou over these rpm. The rattle desappear when I lock the 4X4. Dealer is out of solution!!

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I have a 2002 D5 with 150,000 on the clock. When cold there is not a problem however at about 2500 rpm under load and when hot it rattles. The noise goes away when the revs are increased or decreased. Its...

Sounds like the viscosity of your oil is not high enough for the mileage. My van has a loud valve rattle when it is low on oil or is in need of an oil change. I use I higher viscosity oil and a bottle of lucas oil stablelizer and it quites right up. This may not be the case for you. You need to isolate the noise. By isolating the noise it will give you a better idea of whats making the noise. Try using a mechanics stethoscope and find where the noise is coming from. It might just be time for your mechanic to overhaul your engine.

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Have your egr valvle checked, if not operating properly it can cause engine 'pinging' which sounds like what u are describing. Let me know how it goes. countrycurt0

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Check the heat shield on the catylitic converter,exhaust manifold. Kev-Mn

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