Mwimab 0 Posted June 5, 2012 Report Share Posted June 5, 2012 Ok i have the Vr in my mk2 and after a big slap of misfortune the bottom end went. I have replaced the whole block and bolted on all my obd2 parts. It runs perfectly fine when cold, and will do for around 3-5 minutes then like a switch it will start running badly, no power like the timings out or a cylinder down. Changed all plugs, changed thermostat, Unpluged one ht lead at a time and every one takes a cylinder out with a audible difference so definately running on all 6!Haven't a clue what it is so any help much appreciated! Link to post Share on other sites
ashmk3 0 Posted June 5, 2012 Report Share Posted June 5, 2012 You changed the blue temp sensor? As that effects fueling on choke and off choke. ? Link to post Share on other sites
Mwimab 0 Posted June 5, 2012 Author Report Share Posted June 5, 2012 The temp sensor is the same as the one that came off the car when it was running fine..... Link to post Share on other sites
Mwimab 0 Posted June 5, 2012 Author Report Share Posted June 5, 2012 The car was an obd2 and i bought an obd1 engine. Got rid of the dizzy and put all my obd2 stuff on. And as said runs perfectly fine untill it warms up a bit then runs like a pig Link to post Share on other sites
michael5556 247 Posted June 5, 2012 Report Share Posted June 5, 2012 Clean your maf. Link to post Share on other sites
cabrioman 6 Posted June 5, 2012 Report Share Posted June 5, 2012 get the fault codes read out see if that gives you any clues .... Link to post Share on other sites
mattvr6 133 Posted June 5, 2012 Report Share Posted June 5, 2012 Coolant temp sounds dodgy mate,check resistance and volts c if it changes when I gets hot Link to post Share on other sites
Mwimab 0 Posted June 5, 2012 Author Report Share Posted June 5, 2012 Already been changed mate. Not this Link to post Share on other sites
Mwimab 0 Posted June 5, 2012 Author Report Share Posted June 5, 2012 And cleaning the maf wouldnt answer as to why its like a timed switch. After reading this it seems to happen when the coolant reaches 40chttp://zpipedragon.com/Home/The_Shop/mk3_jetta/VR6-Page/vr6_tech.htm Link to post Share on other sites
mattvr6 133 Posted June 5, 2012 Report Share Posted June 5, 2012 Fuel pressure fault maybe? Airflow metre try unplug it when its running,or lambda sensor faulty had that on a few cars,ps I'm a mechanic lol Link to post Share on other sites
Mwimab 0 Posted June 6, 2012 Author Report Share Posted June 6, 2012 Exactly the same when i unplug the maf sensor. not sure about fuel pressure but like said its like a switch. I can jump in it from completely cold and its fine for 3-4 minutes and drive as quick as i like. Then like a switch it starts running like a bag of pooooo Link to post Share on other sites
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