Car out of cruise control flutters or runs rough from 45 mph to 55 mph and once over 55 mph runs smooth. I notice from 45 to 55 the rpm guage moves with flutter or rough running engine. when i put in cruise control it smooths out. Fule flow and filter have been changed.
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Sounds like needs a tune up, New spark plugs-wires, could be running on 5 cil. put a new fuel filter on, this helps sometimes. Buy gas treatment at Autozone, you may have water in your gas, run all the gas out and buy gas at a different place than before. Try and get 91 oct. better fuel may help.
I would take a blind guess and sat the speedo sensor has an issue. 99' beetle should have an 01M auto, and the speed sensor is also the dipstick for the final differental drive. search around this area of the trans for the cable and snoop around. loose at the trans ? bad connection somewhere??
Sounds like you could have gotten some water in your fuel tank from that fill up. Go to a autoparts store and get a product to put in the tank that takes care of water in fuel. Use it when you fill the tank up a few times after and hopefully it goes away. Whenever you can't sustain power in the engine or it runs rough then your cruise control will constantly be shut off because the engine doesn't have the power to keep the speed up and should go away once your engine is running clean again.
Check your lockout sensor on your transmission by unpluging it and try driveing it with the sensor unpluged. It should be located on the side of the transmission between the transmission and the fan, under the air filter box.
try pulling off the air breather hose and look inside at the mass air flow sensor,it looks like a wire with a diode hooked to it incase you didnt know,see if there is any fuzz on it,sometimes the air filter will lose small pieces and the mass air flow sensor catches it.If that doesnt work then you may have a fuel problem,weak pressure,causing the mass air flow sensor to read too much air so it tricks the computer to adjust the issue.
o.k... question... when you punch it... does the car barely go... and the engine reve up? if you gently press the gas... does is act the way it's suppose to? if that's what you have... change out the fuel pressure regulator... and the fuel injector... see if that doesn't work for you... o.k... good luck to you
car out of cruise control flutters or runs rough from 45 mph to 55 mph and once over 55 mph runs smooth. I notice from 45 to 55 the rpm guage moves with flutter or rough running engine. when i put in cruise control it smooths out.