My speedo was playing up such that the needle would do a lot of jumping about and at the same time the engine would tend to hesitate for a second or two at the same time. A firm bang on the dashboard over the speedo area would stop the engine's miss and settle the speedo at the same time. A local audi mechanic said there is no connection between the speedo and the engine's performance but I know I wasn't imaginaning it!!!
Subsequently I eventually fitted a second hand speedo which solved both the afore mentioned problems confirming to me that there must be some kind of connection between speedo and engine (perhaps through the engine management? )
Anyway this second hand speedo has started playing up now with same probs as before only today the car actually died on me all together. I restarted the car without fail and it seems fine now,(as long as I give the dash a good firm bang now and again to stop speedo fluctuation and engine hesitation) By hesitation I mean a feeling of slight jerks in the car when travelling at average speed. Also the fuel pump is very loud constantly.
What I want to know is this...
Could the car have died on me because of the actual speedo prob?
What is the connection between speedo and engine?
Also is there anywhere that can repair speedos instead of me fitting yet another second hand one?
And finally why is the fuel pump so loud.
Any experienced opinions very much appreciated.
Pete.
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Can't help with the speedo problem (although if it's an electronic speedo, I would try cleaning all the instrument pack connections with contact cleaner for starters), but...
Engine hesitation - could be rotor arm, distributor cap or plug leads. 5 cylinder Audis with electronic engine management seem prone to this sort of problem. Is this vehicle new enough to have a diagnostic port in the driver's footwell? If so, get an independent Audi specialist to check the system for fault codes. If there aren't any, change the above components. Not expensive, and you're buying reliability anyway.
Fuel pump - if it's the same in-tank submerged pump as my Coupe, chances are the gauze strainer is blocked with rubbish. You'll need to take the pump out, drain the tank and clean out all the rubbish.
Richard Hall
bangernomics.tripod.com
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ses
Only a partial answer but, yes, there could well be a conection between the speedo and the engine. Most modern fuel injected cars incorporate a speed sensor which links to the engine mangement and which directly affects the engine's operation, usually to minimise emissions. If that signal is lost, it can cause significant problems with the way the engine runs, as you seem to have found out.
Regards
John S
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