1964 VW What makes my 64 VW hesitate when coming off idle. Engine ideling I step on the throttle when the light changes and there is a slight hesitation and then the engine rpms come up and all is ok. Only happens when engine is idling and I accelrate form idle

Egr valve is sticking on so bad idle when you slowly take off valva open to fast putting to mush air in the engine equal hesitation leave the car idling take something like a hammae gently tap on that egr and your idle should get better after disconnect the electrical part of the egr and road test it should be good and after its your decision to change it or leave it like that if you leave it disconnect check engine light will be on but you no its because you disconnected that valve

is the check engine light on? check for mas air flow sensor

do u have a service engine soon or check engine light on?

If the light is on the engine computer will have a trouble code or codes, which may help you towards solving the problem. Have the computer scanned for the codes. Go from there. Good luck.

Could be one or both of two things.

1. The accelerator pump in the carb is clogged, the linkage is unhooked, or the diaphram in the pump is bad. It's cheap to replace and comes in the carb rebuild kit. This usually just causes hesitation when you step on the gas pedal. It doesn't usually cause the engine to stop running.

2. More likely is that the main jet in the carb is clogged. At idle, high vacuum under the closed throttle plate in the carb causes fuel to flow thru the idle jet. As the throttle plate opens (as you step on the pedal), the vacuum under the plate dissipates, stopping the flow of fuel thru the idle jet, and the vacuum ABOVE the throttle plate increases, which is supposed to then draw fuel from the carb bowl thru the main jet in the carb. If the main jet is clogged with dirt, then it can idle just fine and die as soon as you step on the pedal.

Plugged air filter - replace.

Dirty throttle body and idle/air control motor - Can of Carb. cleaner sprayed into throttle body and idle/air hole while engine is running.

If engine is also running rough check:
-Spark Plugs.
-Compression for bad valve.

Idle is automatically set&monitored with a timing sensor on the camshaft, i found my engine(1.8 20v turbo) would idle low then go high and almost stall sometimes and all i did was remove the fat black pipe on the throttle and clean inside the throat with a cotton rag dabbed in wd40.Hold the throttle open manually and clean on and around the throttle plate as the oil burnt&recycled creates a hard carbon that stops the throttle working correctly.When did you last change the sparkplugs, air filter, oil and oil filter and remove damp from the spark plug area using wd40 on surfaces applied with a cotton rag.These contribute all to your problem.As you dont state milage etc it could be a worn engine or slipped cambelt(1-2 teeth can make a slight diffirence).

Vacume leak or bad idle motor. With the car in park and running with the hood open listen for leaks moving your hand around the different hoses looking for a change in the sounds that you hear. The idel motor also makes the car idel up to 1500 RPM or so right at start-up then idel down, If it doesn;t the idel motor is likly. Check engine light is on when running? Test for codes, Follow code test charts don't skip any steps!.

If the check engine light is on, take the vehicle to an autoparts store and have them scan the computer for any fault codes that are stored there. Most parts stores will do the scan for free. I would suspect something like a faulty idle air control valve, but getting the codes will help narrow down the problem. Hope this helped and best wishes.

i would try cleaning mass air sensor, its mounted in air duct between air filter and throttle body, they sell the cleaner at auto parts stores, also as stated bofore make sure the intake pipe clamps are tight and it's not cracked, if that doen't fix it i would investigate a fuel pressure problem either a weak pump or problem with regulator