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post #1 of 43 (permalink) Old 03-25-2008, 03:31 PM Thread Starter
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Unhappy engine vibration

to all, i have a 1995 rover classic with a 4.2 engine about a week 4 weeks ago i started to have a vibration in my motor. when diving the vibration varys in severity at all speeds. when parked the vibration seems the worse around 2-3 thousand rpm. i have tried everything i have changed the stepper motor, maf,ignition amplifier,coil,cap,rotor,wires,plugs,catalytic converters fuel filter and fuel pump and tank recall, checked my timing,air gap etc please help i dont know what else to do i am just about ready to sdismantle the motor thiking its internal the motor has 156,000 miles on it. please does somebody have an idea i have done tons of work and hate to give up thanks all
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post #2 of 43 (permalink) Old 03-25-2008, 03:33 PM
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What kind of gas do you use?

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post #3 of 43 (permalink) Old 03-25-2008, 03:46 PM Thread Starter
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high test only thanks
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post #4 of 43 (permalink) Old 03-25-2008, 03:52 PM
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If you are in NY, you can take it to my LR guy he's amazing my engine purrs @ 185,000+ miles. He always has high mile RRC and keeps them going. Give him a call Ricardo is his name 718-274-5761. Good luck!

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post #5 of 43 (permalink) Old 03-26-2008, 08:42 AM
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Is there a sound associated with this, or is it only "felt"? Possibly a harmonic balancer (up front on end of crankshaft)?? Does this vibration start after it's warmed up...or right from start up?

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post #6 of 43 (permalink) Old 03-26-2008, 10:36 AM
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motor or tranny mounts?

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post #7 of 43 (permalink) Old 03-26-2008, 10:44 AM
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there's not an engine in the world that doesn't vibrate at 2-3 thousand rpms.

if its accompanied by a metallic noise you have trouble.
otherwise i'd try to dampen the vibration by tightening the mounts. or replacing them if the rubbers shot.
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post #8 of 43 (permalink) Old 03-26-2008, 03:25 PM Thread Starter
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theres no noise with it and it comes and goes gets really bad and then less when driving and when parked it does it at idle and gets worse around 2-3 thousand rpm then less at higher rpms thanks
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post #9 of 43 (permalink) Old 03-26-2008, 03:25 PM Thread Starter
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did not do this 3 weeks ago and no noise with vibration
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post #10 of 43 (permalink) Old 03-26-2008, 03:26 PM Thread Starter
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checked mounts no probs there thanks
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post #11 of 43 (permalink) Old 03-26-2008, 03:27 PM Thread Starter
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vibration only felt and is worse when warm thanks
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post #12 of 43 (permalink) Old 03-27-2008, 02:19 PM
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anything can cause a "vibration" : if the engine is misfiring... if one bank is running leaner than the other(o2 sensor), if one exhaust manifold is leaking and creating less back pressure than the other . it could be something as simple as fouled injectors , just going through and replacing hundreds of parts unfortunately does not neccesarily solve the problem, you need to find another clue.
what else besides "vibration"?.... you are only noticing it at idle more than when driving because the momentum of the moving vehicle pulls the engine through the "mis" and it is less noticeable. it sounds like an ignition miss maybe. take it out where it is pitch black and lift the hood while it is running, look for arching, cross-firing or grounding from the wires and distributor , you may just need a new dist cap or to re route some wires , maybe a wire came partially loose at the connector...
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post #13 of 43 (permalink) Old 03-27-2008, 02:40 PM
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Check the engine (radiator) fan and water pump. Fans can go brittle and bits break off. The bits missing cause the fan to be out of balance and puts a viabration through the whole motor.
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post #14 of 43 (permalink) Old 03-28-2008, 01:21 AM Thread Starter
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i have checked all injectors,wires,cap,rotor,plugs,even checked connections to injectors and ignition components
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post #15 of 43 (permalink) Old 03-28-2008, 02:13 PM
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sounds like that vibration your feeling is your engine running!!!!

without any other information from you i can only piss in the wind.
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