RicardoM

Use High Performance Gear Oil (GL4+) SAE 75W-90.

First of all, some theory: And another bit of theory: The conclusion is this: you need a GL4 gearbox oil given you live in a hot weather region, you need a 80W90 oil My recommendation is to buy 3 liters of this oil: https://www.mannolegypt.com/products/manual-transmission-oils/universal-80w-90/

What country do you live in? I'm asking to see what products you have access to.

Of course it idles rough, yet you didn't mention it when doing your test. The MAP sensor (corrected with temperature) is measuring the load of the engine. Based on that and on many other factors, the ECU sets the injectors, spark, and timing. The engine is stalling when the fuel mixture is out of limits (too lean or too rich) based on bad data from sensors. By the way, a bad coolant temperature sensor can stall the engine too and create a no start issue. That is why I don't recommend swapping parts blindly. Yeah, you might solve the problem by pure luck, but usually things don't go well.

How nice. According to this experiment, the map sensor is useless The car runs fine without it. Why bother buying a new one?

How would you describe your car mechanics skills, diagnose knowledge, and available electrical measuring instruments?

Mike IIRC you're half way in your 70's. You're asking a very subjective question with many human variables that we have no clue about. My intuition tells me it is better to let a garage do it.

Read my signature. Fuel System & Ignition / Simos 2P / Simos 2P Fuel Injection & Ignition System / Page 24-22 Engine / Engine 1.3 (135, 136) / 1.3 Itr. Engine, Mechanical Components / Page 20-18

Since you have found several connectors having corrosion, I would have a look at all of them in the engine bay. Also it might worth taking a look at electrical pump connector too. That is why I asked about the throttle pedal. If the throttle position sensor (fancy name for the potentiometers that sense the throttle flap position) has developed a groove or some worn spots around idle position and cruising positions, then you have the culprit right there. Do you have the factory service manual for Felicia?

One other thing. Does the juddering appear only when the throttle pedal is pressed approximately the same amount? Let's say around 10-15% of wide open throttle? Or is it the car judders also if you keep the pedal pressed constant at let's say 50% then slowly press further?

That is not a throttle reset.

Most probably it is the knock sensor. The third wire is the shield that goes to the ground only at the other end of the cable.

I can't see where it is located.

My recommendation for now is stop looking for parts before having evidence of fault. Clean the throttle body. Reset the throttle body. Not sure if Launch X431 can do it. I plan buying one.

I don't know if that will solve your problem but it definitely worth spraying the contacts with contact spray or WD-40. What mileage has your car? First advice: erase all codes and check after 2 engine starts if and what errors come back. If there are errors, paste their code in here. Add the freeze frames (engine parameters when the error was set) too.

We're talking about this

@Jordan975 There are many topics about such project. Search both in this section and in section Classic SKODA Projects.

mike Is there any reason you think it is the switch that is faulty?

I would be very interested what is RossTech's review on OBD11

If not in turn, is it possible to reset all misfire counters at once?

I'm talking about these counters.

Hi Can I reset the misfire counts for each cylinder in turn ? How?

These are all flavors of Felicia special I know of. It would be nice to gather in this topic photos of each one of them and also what special characteristics they have. Active Arcane Atlanta Bergamote Bohemia Bonne Nuit Color Line Comfort Country Excelent Family Friend Fun Genua Grand Air Klif Lato Laurin & Klement Magic Mangas Milena Morzine Mystery Pacific Pack Palomino Perfekt Safe Line Saga Samba Space Line Sport Line Ste Maxime Tango Tipi Trend Trumf X-Line Yellix

In this guide you will learn how to adjust the valve clearance. The guide is aimed at the most common engine mounted on Felicia, 1.3 MPI. The procedure is similar for other engine types, but check the Service manual for specific clearance values. Prerequisites The engine must be cold and the air temperature must be below 20 C. Remove all spark plugs. Remove the valve cover. In order to be able to rotate the engine, jack up the front right wheel and shift in 4th gear. By rotating the front right wheel clockwise by hand, the crankshaft of the engine will rotate easily. Tools needed Flat screwdriver 11 mm ring wrench Feeler gauge set Torque wrench (optional) The "5" method We will apply the method known as the "5" method for reasons described below. Definition: Valve overlap - we say that the valves overlap when, for a short time, both valves (intake and exhaust) are open. This moment occurs when the exhaust stroke ends and the intake stroke begins. In terms of crankshaft angle of rotation for all Felicia 1.3 engines, the valves overlap for 20 - 39 degrees. We can assess that moment fairly precise for each cylinder by watching the movement of respective rockers. We look for the precise moment when the exhaust rocker is ending to move up and the intake rocker is starting to move down simultaneously. So let's do it! Rotate the crankshaft until: Cylinder 4 valves overlap --> Adjust valves clearance on cylinder 1 Rotate the crankshaft 180 degrees until: Cylinder 2 valves overlap --> Adjust valves clearance on cylinder 3 Rotate the crankshaft 180 degrees until: Cylinder 1 valves overlap --> Adjust valves clearance on cylinder 4 Rotate the crankshaft 180 degrees until: Cylinder 3 valves overlap --> Adjust valves clearance on cylinder 2 We see now why the method is called the "5" method. The sum of the cylinder numbers for overlapping and adjusting is always 5 (4+1, 2+3, 1+4, 3+2). The process is shown in detail in the figure below. Adjustment Insert the ring wrench over the locking nut of the rocker and unscrew it half a turn. Insert the corresponding feeler gauge between the rocker and the valve stem (see photo below). Rotate the screw with the screwdriver until the feeler gauge moves with a slight drag. Keep the screwdriver still and lock the nut with the ring wrench. Optionally torque the nut at 15 Nm with a torque wrench. Repeat the process to all eight valves. Then rotate the engine two turns and recheck all eight valves again. Assemble everything in reverse order.

I bring to your attention the subject of setting the valves clearance for Skoda Felicia. There are two methods available: one described in Skoda workshop manual and another described in Haynes manual. They are not equivalent, meaning they produce different results. So my question is: what method you find more accurate? Why? Skoda method Haynes method