Question about Volkswagen Golf

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MY Y REG VW POLO DOESENT ACCELERATE PAST 60MPH,THE REVS AT ABOUT 3500+ BUT NO SPEED ,I HAVE CHANGED LAMBDA/ROADSPEED SENSOR/REAR ABS SENSORS,AMGETTING A FAULT -VEHICLE SPEED+RANGE SENSOR,WHERE IS THIS ON GEARBOX? IT IS 1.4I AUTO.

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  • jmur51 Nov 22, 2009

    I HAVE DONE A TEST WHICH SHOWS SPEED /RANGE SENSOR FAULT, I HAVE CHANCED YHE ELECTRONIC SPEEDO SENSOR ON BOX BUT AM LED TO BELIEVE THERE IS ANOTHER SOMEWHERE ON BOX?

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Speedometers were optional equipments but became an industry standard. But do you know where a speedometer gets its reading? The device that measures how fast your fast is running is the speed sensor. Today�s vehicles make use of this technology not only to monitor vehicle speed, but also to monitor component position or rate of speed change on virtually any moving part of a vehicle.

Speed sensors can be mounted on the different parts of the vehicle to perform different tasks. An engine speed sensor is mounted on the vehicles crankshaft and is usually where the speedometer gets its data, whereas wheel speed sensors are located individually at each wheel or axle generating a signal that changes with wheel speed. A speed sensor signal that suddenly drops off indicates that one or more wheels would lock up.

It is important that these two speed sensors are always in good working condition to provide accurate data. If one of them gives the wrong signal, control functions of the engine ECU and ABS ECU will be largely compromised. So to have a long-lasting speed sensor, cleaning it every now and then is necessary. Simply wipe off the grime it has accumulated with a towel. Or it�s okay to carefully blow-dry it with compressed air. Anyway, it does not need to be hospital-clean, it just needs to be free from major debris and metal media. This will help. Thanks please keep updated.please do rate the solution positively .thank you for using fixya.

Posted on Nov 22, 2009

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Hi
the cause could be a clogged, or partially clogged, catalytic convertor. Also, a collapsed interior wall of an exhaust pipe, in which case one might hear a whooshing sound as air tries to pass by the restriction.
It could also be a tranmission tourque converter failing. Also could be a broken gear inside the tranny, which will not engage no matter what.
OR
auto transmission ,it may shot and it wouldn't shift out of the 1st automatic gear, hence, not being able to accelerate over 60mph.
OR
this happens when if tires of a different size is installed on the front than were on the back. at around 60, traction control thinks the tires are slipping, because one set is rolling faster than the other. go to the shop and get 4 of the same size on, and no more problem.
OR
Another thing is, if you tried replacing your distributor cap and spark plugs. If you did not put them back on properly, the firing order is messed up and you'll have a hard time accelerating.
OR
There are numerous possible causes, of course, like a coil that isn't feeding enough energy to the spark plugs, a choke that's stuck, a fuel pump that's not pumping, an electrical malfunction. But the one that comes to mind is a bad "sock' in the fuel tank. This "sock" is a toothpaste-tube-like fine screen in the fuel tank that is supposed to prevent small particles of junk from entering the fuel lines and the fuel pump. Over time, the pores of this thing can become absolutely restricted--I don't know whether it's a reaction to the gasoline, or whether it's a natural result of the material aging, or what. Result: Hardly enough fuel gets to the engine for it to run. And, of course, the faster you go, the more fuel you need, and the more noticable the restriction is.
replacing fuel filters and fuel pumps will be a solution. I'd say it happened to my Lincoln, too, but the sock in that car actually disintegrated and wound up being jammed to the carburetor's filter by the fuel pump. Yet in the case of the Lincoln, I couldn't get past 20 mph until the problem was solved by removing the tank, flushing it, reinstalling it, and installing an in-line filter between the tank and the fuel pump.
In your case, if a sock is really the problem, I'd remove the fuel sending unit in the tank, chop the sock off, and install an in-line filter. Take this course if you've determined that the car is starving for fuel and you're sure the fuel pump isn't bad.
One other possible symptom of this sock problem is observed when the car runs decently in cooler weather and starves for fuel in warmer weather.
Thanks for contacting fixya.com

Posted on Nov 20, 2009

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check your exhaust and carborator tuning pin that creates the batter combination for firing in bore for batter performance & less emitions ,so check is it ok or not than go to your nearest service center that havad certified mechanics,

till you read this you had solve this problem definatly,

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