LeadDiplomat

Ok so the car works, but that is not a relay issue in my opinion(i know only basic electrics so take this with a grain of salt) what he probably did is that he spliced a triger wire from the ecu to ignition 12 volts, prob becouse of ecu issue. What u can do is try and find where he spliced in(def a dashboard out job) and add a basic switch so u can manualy control the priming of the fuelpump(race car style 😉), or rewire the trigger wire back to the ecu and chase the accual issue. As for the manuals have u checked malualslib or scribid?

Does the car run like that??

What do u mean directly?? if the engine dosnt flood with gas, my guess wuld be fuel pressure regulator just returning the gas in the gastank

Try hitting the exaust(when its cold) if it rattles it eather a disintegrated cat of exaust flex pipe thats fallen apart. It shuld also rattle i u go up a steep hill.

I think thats the pin for the whole module becouse immob is a part of that cluster try logging in with it and than try changing the settings

If i remember right to make any changes to the instrument cluster u need a car specific code that can be found in the owners manual. There is some way to pull it with vcds but i never had to do it so i cant help u with that, second option is go to a dealer and pay them to get it. When u get the code u go in the login menu on the right enter the code, and than go and make changes. Also if it says that code is invalid put a zero eather before or after the code.

Ok but what did u mean by passager carpet is wet? My guess is if ecu is getting wet it wudnt run at all. This is a long shot but does that engine have a ditributor? Becouse my first mk1 was aee had cracked distributor cap and was also runing rugh full of oil from leaking valve cover gasket and it also didnt like the rain wudnt shut down but u culd feel loss of power.

I solved no heating issue without reving the engine to hell. After tearing the whole car multiple times apart it had 2 thermostats 1 normal for bfq and one for avu (apperenty u can fit avu thermostat tight on coolant return line of the watterpump) U def shudnt do this. Anyway car runs great now and has heating.

U rly shuld get the car scaned to see what errors its getting. With that beeing said u can do some basic inexpensive stuff like cleaning maf, trottlebody cleaning, replacing fuel pressure regulator and fuel filter. Ecu is right next to the wiperblade motors so i dont think its that. That is a seperate issue your heater core is prob leaking.

i have the same overly complex engine 105-110 is perfectly normal for that engine it uses map controled thermostat. Switch to full heating or go full trottle of u want it to be 95-100. As for the fans kicking in randomly try changing the sensors one is in the middle of plastic housing on the right side of the block and the other one is on the lower right side of the radiator. 87c thermostat dosnt fit from what i figured out thats for avu engine code. Also dont use regular watter for coolant, heater core is prone to cloging and u need to take out the whole dash to change it. If ur changing sparkplugs change the leads aswell so u dont have to take off/pay someone to take off the whole intake manifold 2x.

I didnt need it prob depends on what unit u get.

Dirty trottle body cudnt close all the way.

Engine codes

Hello, i have issue with my octavia mk1 new o2 sesor cleaned maf, new plugs, new fuel pressure regulator. The car gets lean code from time to time, and on a cold start it runs not rly rugh more like light shaking(gets better as it warms up). I looked at vcds data and crank pos sensor is the only stuff that seams jumpy it jumps from 9° to 14° rapidly with ocasional dips to 6. So culd crank pos sens couse such behaviour? Or i need to keep looking? Only other code i have on a car is vhiecle speed sensor, dosnt use oil or coolant.

It is a manual ac, no heat is not rly an issue as temps rearly go below 0 in the winter now its 30+c and loosing coolant is a problem. If coolant and a termostat dont fix it its going for a headgasket test, if its not that the thermostat is going out.