I am still at a complete loss with my Jetta. :banghead I’ve gone through all of the basics and nothing seems to be wrong with the basic stuff (plugs, wires, MAF, etc) but the car is running pig rich and bascially flooding itself. So I’m left with it being a sensor somewhere that is telling the ECU wrong information.
So does anyone own/work at a shop with a scanner or have access to a scanner so I can see if any of the sensors are getting odd readings. If you can help, please pm me with a price. I really gotta get this thing running right. I can trailer it just a bout anywhere I need to.
Swapped the coil from the Golf which is only about 3 months old –> No change
Swapped plugs, wires, cap, rotor with Golf which were only about 3 months old –> No change
Swapped o2 sensor with Golf which ran fine –> No change.
Swapped MAF with Golf which ran fine –> No change.
Swapped both coolant sensors from the Golf –> no change.
Though about the TPS but they are different between the two cars so I couldn’t swap them.
I thought about the cold start, but lately it just plain won’t start at all. I would think even with the cold start, that it would atleast start… it would just run very rough.
I turned the key on to get pressure to the rail, manually activated the injectors 1 at a time by grounding them. Watched the pressure drop and all 4 injectors dropped equal pressure; about 10psi per 1 second ground signal… roughly. So the injectors appear to be working properly. And its getting fuel obviously since it is running so rich, so I doubt it is anything with the injectors.
Vacuum is solid at 17-18 during idle and when it does get started, it maintains 17-18 and goes slightly up if I ease on the throttle to rev it up. if I “burp” the throttle and the engine bogs, it goes down to around 5 or less.
So far the parts I have swapped have been listed as the same part number; with the exception of the oxygen sensor which due to it being pre-cat, I would think it would be the same since it is the same engine.