Need help on 91 jetta w/ 1.8l engine,idling issue.?

Question:
first and foremost thak you in advance to those who would like to answer,i don'tneed answer like take to a shop or mechanic,i need somebody that have some experienced on this car line more of a mechanic/technician.i'm amaster tech myself on another car line.my problem is that this car will not idle in the morning on it'sown,i have to hold down the gas for a minute,and the other issue is the idle fluctuates when coming to a stop when the engine is warm,it does not stall and the car runs great even having 300k miles on it.please tell me what do they call the particular part needed for this problem.thanks again.

Answers:

Looking to buy a classic 1972 or 73 benz 280sel..Was wondering the cost of repairs on these older Benz ??

Most likely problem is fuel pressure related. There is a manual adjustment in the air box . It is a small hole in the top between the air horn and the fuel distributor body, the part with the fuel lines running off it. You need a long allen key approx 6" long, about 1/8". If it hasn`t been adjusted before there may be a small plug in the hole. Remove it and insert the allen key. Do not apply to much pressure as this will throw off the settings. You will not need to turn much more than 1/4 turn. There is also an idle adjustment on the throttle body on the back side towards the firewall. Set a smooth idle with the engine warm and via the fuel pressure first. Adjust your final idle speed as per manufacturer specs 750-825 man, 850-925 auto. Remember to leave the lights on when setting the idle

Where do I get this part?

try the choke let of valve on the carb - usually when cold when it does not work right it will not idle right till the engine warms up

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Check Air Mass sensor failing - Golf in workshop last week with similar problem. Couldn't work it out so called in a VW tech to investigate and he found it. Apparently quite common.

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However, the only way to check it was using a diagnostic - it still gave a reading but an incorrect one. If you'd like the correct values, email me and I'll speak to him.

What is the difference...?

water temp sensor that feeds the computer not the gage, about 15 bucks at a good parts store. You will get wet changing it. do it when the engine is cold and get the aluminum washer/gasket for the darn thing. Probably has a plastic connector with 2 - 3 pins and If I remeber right only two wires in it on the side of the head facing the transmission.

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yeah thats it

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ASE Auto tech, 30 years, 92 GTI16V 2.0L

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Could be a weak fuel pump and/or partially plugged fuel filter.Check fuel pressure.Could be a defective water temp sensor.Helps control air/fuel on start up.Check EGR for proper function.Can cause stalling.
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