[MR2] MR2 (MkII) Vibration Question

[Benn]

I had some loose screws on several trim pieces around the rear window 
interior on my Mk I.  Dunno if a similar thing could happen to you, but I 
had tried in vain to tighten the outside window area trim pieces thinking 
that was it.
Benn
----- Original Message ----- 
From: "Donald Chalfant" <dkchal at datasync.com>
To: <alkirab at earthlink.net>; "MR2 List" <mr2 at mr2.com>
Sent: Tuesday, March 10, 2009 9:00 AM
Subject: Re: [MR2] MR2 (MkII) Vibration Question


>I think we should concentrate on the hot/cold thing.  Since its at a
> particular frequency, its something with a mass that is easily vibrated,
> like a piece of fuel line, tube, metal, etc and it is only in play when 
> the
> system is cold. This suggests it may be part of the cold start system, or
> something which thermal expansion applies enough damping force to stop the
> vibration.  You've attacked all the normal sources affected thermal
> expansion. Maybe try the cold start injector, fuel line, timer and bracket
> which fastens it, etc.  Perhaps a piece of tape around the fuel line or
> return line (it sees less action while engine is cold an more fuel is 
> being
> consumed) will dampen the noise source.
>
> Or a set of headers and straight pipes leading to 4" tail sections. The
> noise will still be there, but never be noticed.
> ----- Original Message ----- 
> From: <alkirab at earthlink.net>
> To: "MR2 List" <mr2 at mr2.com>
> Sent: Tuesday, March 10, 2009 2:42 AM
> Subject: [MR2] MR2 (MkII) Vibration Question
>
>
>> 3-10-09
>> MR2 (MkII) Vibration Question
>>
>> Hi Group,
>>
>> Have been chasing down noises and vibrations in the '93 MkII N/A that are
>> really getting me close to the end of my patience.  For weeks I've been
>> tightening every heat shield nut and bolt I can get reach in the engine
>> bay and passenger compartment, to try and stop a really nasty set of
>> vibrations that occur at 3900-4000 RPM, in particular  when the vehicle 
>> is
>> cold .  I've even pulled the seats, inside rear fire wall panels, storage
>> console, seat belt retractors, and rear window trims , but still the 
>> noise
>> persists.  The vibration seems to be emanating from the inside rear of 
>> the
>> vehicle, almost from the glass area...but no amount of direct pressure or
>> holding pressure on sheet metal, panels or glass itself helps.  Many 
>> years
>> ago I had to deal with vibrations traveling up the shifter cables, by
>> putting a slight twist in the cables at the shifter assembly.  The 
>> problem
>> I'm currently dealing with occurs when the vehicle is cold and continues
>> until operating temp is reached!  You can't hear it outside the vehicle,
>> but inside it's really a pain.  In addition to tightening the engine bay
>> heat shields, I've had the vehicle up on the rack and tapped and pinged
>> everything that looks like it might want to resonate...nothing!  Tight as
>> a drum.  Even having a neighbor hold the throttle at 3900 and listening
>> outside the vehicle hasn't offered a clue.  Shifts from 4th to 5th are
>> really where you can hear it...Anybody have any recent experience with
>> this one?  One UK sight talked about hinge pin wear on the engine bay and
>> rear trunk...anyone heard of this as a noise source?  Almost forgot, I
>> finally had to replace the original rear brake pads and have the rotors
>> turned .015 in.  (15 years, 50,100 miles) ...Front original pads and
>> rotors still have about 15,000 miles to go and running strong!
>>
>> Thanks,
>>
>> Colin
>> '93 MR2 N/A
>> W / 50,100 original
>> _______________________________________________
>> MR2 Mailing List
>> MR2 at mr2.com
>> http://mr2.com/mailman/listinfo/mr2_mr2.com
>>
>
>
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