- Joined
- Oct 7, 2007
- Messages
- 4,439
- City
- RFD/BNA/PHT
- Vehicle Year
- '10
- Engine
- 4.0 V6
- Transmission
- Automatic
- My credo
- Don't vote Democrat.
I just bought a 1990 Jetta since the wife insists on decent mileage and four doors, and that's about the best compromise out there (it's getting 30+ MPG and needs a tune up).
I've had no less than six A2 Jettas, both sedans and coupes. That 1.8 8V is bulletproof, and I've never been able to break the 02A trans in them either on the street or the road course. The most work I've EVER done to one of them is replacing the cam followers on my 87 coupe at 286k. Still got 32 mpg and burned zero oil when I sold it 2 years ago at 308k.
Your '90 has Digifant II engine management, IIRC. Here is a great resource for advice and technical info:
http://members.tripod.com/~fuelie/intro.htm
Do yourself a favor and clean and lube all the ground points you can find in the engine bay, particularly the right-rear corner of the valve cover and the negative battery cable grounding points. Digifant doesn't like dirty grounds, and it will simply refuse to start (the injectors will go to full-on and flood the engine) if the grounds are loose and/or dirty. Also doesn't hurt to add a ground from the engine to the unibody.
Follow this link to get info on buying the ECU chip that solves off-idle lean stumble that Digifant is famous for:
http://forums.vwvortex.com/zerothread?cmd=print&id=3387923
Remaps the entire fuel curve among other things, and it's half the price that I paid for mine 5 or 6 years ago. It works, and it actually increases fuel economy as long as you stay off the skinny pedal. Takes 20 minutes to install.