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My rev counter suddenly increases without engine revs doing

Customer Question
so.A fist banged under the...
my rev counter suddenly increases without engine revs doing so.A fist banged under the instrument cluster resets but not for long,,the solution is ?
Submitted: 1 year ago.Category: Mercedes
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Answered in 7 hours by:
8/19/2016
Mercedes Mechanic: Matt, Engineer replied 1 year ago
Matt
Matt, Engineer
Category: Mercedes
Satisfied Customers: 22,440
Experience: Mechanical Engineer with 23 years experience in the auto industry, 8 yrs in formula 1 engine testing
Verified

Hello

1st thing to try is to disconnecting the instrument pack from tthe wiring loom and spray both halves with some switch cleaner,

also trace the wiring loom back from the cluster checking for damage to the insulation and hard sections of wire

if this doesn't help then I'd say the instrument cluster will have to go off for repair

try this firm:

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http://www.zingelectronics.com.au/ecu-and-ecm-repairs/s36286

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Mercedes Mechanic: Matt, Engineer replied 1 year ago

Hi

do you still need help?

Bear in mind that the site takes a deposit from you at the beginning and this is held by the site until you rate my answer at which point the cash is split between the site and the expert. I am only paid for my work on this question if you rate my answer, using the star system at the top of the screen. Please do not forget! Thank you

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Customer reply replied 1 year ago
why does rev needle go down when instrument cluster hit from below and up ie shows higher revs when struck from above,please.
Mercedes Mechanic: Matt, Engineer replied 1 year ago

Hello

Ok in that case I'd suspect the instrument pack is faulty and needs repairs to the rev counter or just replace the whole thing

http://www.zingelectronics.com.au/ecu-and-ecm-repairs/s36286

Ask Your Own Mercedes Question
Customer reply replied 1 year ago
when you say instrument pack replacement are you referring to rev counter only or whole instrument panel,one sounds pricy the other v expensive,any clues? repair of rev counter seems the way to go.How does this work,surely it is all electronic with this influencing the rev counter,not some rotating bit of wire.Is getting the instrument binnacle out easy.Any ideas on time and cost please.
Mercedes Mechanic: Matt, Engineer replied 1 year ago

Hello

the instruments aren't separate , rather its all 1 unit

and the needle is driven by a small motor inside the pack thats in turn controlled by its own control unit

so I'd say its best o get in touch with the electronic specialists

Ask Your Own Mercedes Question
Mercedes Mechanic: Matt, Engineer replied 1 year ago

Hi

do you still need help?

Bear in mind that the site takes a deposit from you at the beginning and this is held by the site until you rate my answer at which point the cash is split between the site and the expert. I am only paid for my work on this question if you rate my answer, using the star system at the top of the screen. Please do not forget! Thank you

Ask Your Own Mercedes Question
Customer reply replied 1 year ago
Hi Matt,am I correct in that a faulty rev counter,rather than poor electrical contact,can only be sorted by replacement of all instrument panel.Since tapping panel above the rev counter increases rev counter needle and tapping below decreases rev counter to zero ( after several taps) does this indicate faulty guage or faulty electrical connection.Cost to restore function will determine my course of action.
Mercedes Mechanic: Matt, Engineer replied 1 year ago

hello

you are correct, if the panel connections are good then either the instrument cluster has to be repaired by a specialist or replaced entirely

the most economical route is to source a good used cluster and have it re-programmed by the dealer

try

http://www.mbspares.com.au/

I'd estimate about $100 for a cluster and then 1-2 hours labour at the dealers

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Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

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