Is the 1989 Jeep 258ci straight six 4.2 Liter engine fuel injected?

Answer 1

No. From the factory it had a Carter computer controlled carberator that was very problem prone. 2 main problems I saw- if you got on an incline front to back or sideways, it would die- not very desirable when that is when you need to power the most! Also there were 2 (supposed) one-way valves in the exhaust. When they became two-way they spewed exahust garbage directly into the carberator. They were expensive from Chrysler but a better way was plug the holes in the air cleaner & put a filter on them (I believe they are 3/4 inch lines). They are supposed to provide clean air injected by the valve into the exhaust for better emissions. It worked as long as the valves remained one-way. There is a throttle body injection by Howell (about $1200) & a multiport system (about $2200-2500) available but neither is cheap. Many people replaced Carter with a Weber or Holley carb & they seem to run MUCH better. Because of reading & talking to owners about these kinds of problems, I opted for a 1991 Wrangler- the first year fuel injection & the 4.0L HO was introduced. I have had it 10 years & it is a kick-butt motor- especially with a large open exhaust & hi-flo intake. This baby MOVES! Now if I could only stop the rust!