I have a 1.8L Jetta engine 1986 in a 79 Westfalia. This thing is a rocket and fuel comsumption is way better than the original, and also I could cruise at 120 km/h or 75mph which is impossible with the original engine. It could do that... when it works!
It’s been 2 years that I try to resolve an issue.
At first, we got misfires during uphills but it wasn’t too bad. From last year, I noticed that when the engine is hot and the outside temperature is hot as well it would do it in uphill and also sometimes on a flat surface.
But this year, it is strange, on hot days it is horrible even on a flat surface, but after 30 minutes driving. It’s as if the engine would like to stall for a split second and then is alive again, no back fires. And this year it does this when the engine is cold at low RPM before hitting the highway.
I even had to stop for 30 minutes when we reached the peak of a mountain in Vermont as I could not pass 60 km/h or 35 mph, it did not have any more power.
It has been sent to 2 garages for the last 2 years.
What has been changed:
- Fuel pressure regulator
- knock sensor
- ignition coil
- fuel filter (fuel was draining very well from the tank so no blockage up there)
And air filter cleaned (K&N nose cone)
I am completely lost, as I do not know where to search now. Wife is hating the Westfalia 😂
The fuel pump doesn’t do any freaking noise, and I hear it well before starting the engine.
Could it be a fuel injector problem or an ECU problem?