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My 91 vw gti 8v is running rough at idle then is ok when it warms up and it is burning to rich do you know what the problem is ?

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Change the thermostat-its not closed when startin

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2003 vw golf GTI idling rough

Hi. Please check the spark plugs, if worn this can happen. Also if the injectors are leaking into the cylinders. This i have seen only once in many years on the 2003 GTI.

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clean throttle body,MAF sensor,check fuel filter and air.

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Rough idle,tps,iac,fuel pump and filter replaced,was running great,then all of a sudden,started running bad at idle,runs ok going down the road...any thoughts?

does it run rough after warm up??or cold too,,u mite have a vacuum leak,,,take some injection cleaner spay,,carb or brake cleaner spray,,seen many different spays used,,,but spay around air intake,,around base,,see if engine will stumble,,also seen temp censer problems,,where its tell the ecu that the motors cold,so it rich-ens the fuel,,injector,,hoped it helped,,

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How do i check if the fuel has air in it? 1985 golf gti 8v

What do you mean? In the fuel line? In the manifold? In the tank? In the engine/cylinders? Do you want to measure A/F mixture? I am guessing you are asking because your car wont start. I am also guessing it cranks and sputters to try to fire, but never catches and runs. Your 85 VW has three common things I'd check first. 1. The O2 sensor wires crack and the sensor quits working sending the car into limp home mode. 2. the cold start injector at the end of the plenum/intake is a 5th injector that richens the starting mixture until the car warms up... it can fail and the car will run like **** until it warms up and runs on the 4 normal injectors. 3. Before the intake plenum, the can shaped thingy with the metal flap/disc you may have tried jamming a screw driver in or pushing open with your finger is a metal flap that controls and senses incoming air and regulates the idle mixture. It has a few position sensors. Don't poke at this part or you will muck up some parameters that are difficult to re-align. If this is it, take the car to a VW mechanic. That little bugger is a real pain.

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Truck stalls

if it is burning rich, there for it will be over fueling around low rpm i do belive, which will cause the engine to flood, im guessing after you have been low rpm then go for high rpms, it like hesitaes and takes abit of a cough then goes, if that is the case then it is overfueling.

there is a way to advance/****** the engine mixture, but id say for safe if you don't know what your doing to take it do a garage, and ask for it to be timed up with the timing strobe light :) which will stop the, over fuelling around low rpms.

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