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Okay so I have 3 new coil packs and 4 new spark plugs on my 2000 VW new beetle 1.8 turbo GLX. I will be getting the 4th coil pack next pay day. Anyway, it misfires under heavy acceleration. I've scanned it with a bosch scan tool and I've done the live time. It says my coolant temperature is -40 and never changes. I've changed coolant temperature sensor twice in 2 weeks. I don't know what else to do. Thoughts? Thanks in advance.
 

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Please post all the trouble codes you are getting; not the descriptions but the numbers/codes, themselves. What brand and part numbers; were the spark plugs and coil packs? We can go from there, thanks.
 

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oem VW spark plugs (NGK) and coils (Bremi for pull out/Hitatchi for bolt down); are recommended versus, the aftermarket ones you purchased. The aftermarket coil packs in particular; have caused people problems (poor quality, cause misfires and fail prematurely; causing the car to run bad), I would get them from your VW dealer or online. For the spark plugs; look at the ngk website, to find the correct one for your car.

NGK Spark Plugs

examples of coils; for the 1.8T:

https://www.ecstuning.com/News/MKIV18t_CoilpackOptions/

http://wiki.ross-tech.com/wiki/index.php/17526/P1118/004376

http://wiki.ross-tech.com/wiki/index.php/17524/P1116/004374

http://wiki.ross-tech.com/wiki/index.php/17748/P1340/004928

p1198 02 sensor heater circ bank1 sensor 2 electrical malfunction

http://wiki.ross-tech.com/wiki/index.php/16524/P0140/000320

http://wiki.ross-tech.com/wiki/index.php/16684/P0300/000768

http://wiki.ross-tech.com/wiki/index.php/16685/P0301/000769 Cylinder 1 Misfire Detected

For the cylinder 1 misfire; you might change the coil pack location and see if the misfire travels to the new location (that would confirm the coil is bad).

As for the temp sensor; I am not seeing a trouble code but you could try testing the wiring and sensor, here is the factory service manual procedure:

http://workshop-manuals.com/volkswa...ction/with_manufacturers_scan_tool/page_1803/

For the 02 sensors; you might pull them and try the test procedures from the service manual. Typically, if you get a trouble codes; for the "heater" portion of the 02 sensor is bad, the sensor usually needs replaced. You can test it with the manual procedures and a multimeter; I compared the difference, between the new one and the old one. Be sure to get a genuine oem Bosch oxygen sensor; you can look up the correct one for your car here (get the "oe" version; not the "universal" type): https://www.boschautoparts.com/

service manual 02 sensor testing:

http://workshop-manuals.com/volkswa...or_regulation_after_converter_check/page_748/
 

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You might also want to check the connections to the coils. I had an issue where the wire going into the connector was corroded and it was not making contact when snapped on.
As far as the coolant temp ...get a new one, they're not that expensive and if the new one is bad then you have a wiring issues which I had there also. Come to think of it I replaced a few of those connectors on my car.
 

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I also had several misfires on my 2001 NB GLX with 1.8T. What I discovered was that some of the wiring for the coils were cracked. It seemed like it was mostly the ground wire. So i ordered some new connectors and replaced all my ignition coil connectors and the wiring that was bad was also replaced. After doing this i still had 2 misfires, so moved them around and discovered the coils were bad. As the misfire followed the coils. After replacing the bad wiring, new connectors and 2 new ignition coils. Darth runs real good and purrs like a kitten. Replacing the wiring and the connectors was not that hard. So i would check your wiring on your connectors. Look real good at all the wiring.
 
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