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Jeep CJ 258 - EFI upgrade #1799823
04/09/15 10:40 PM
04/09/15 10:40 PM
Joined: Sep 2003
Posts: 1,443
New Jersey
C
Choppintime Offline OP
pro stock
Choppintime  Offline OP
pro stock
C

Joined: Sep 2003
Posts: 1,443
New Jersey
Wondering if anyone has went with one of the EFI systems. My CJ has the stock 4.2 with a 1 bbl intake/carb. I was looking to upgrade for some reliability and possibly a little more power.

The Mopar Performance EFI is costly but what I've read about it, it sounds great.

Anyone have any info/opinions ?

Re: Jeep CJ 258 - EFI upgrade [Re: Choppintime] #1800236
04/10/15 01:26 PM
04/10/15 01:26 PM
Joined: Feb 2003
Posts: 21,318
Manitoba, Canada
DaytonaTurbo Offline
Too Many Posts
DaytonaTurbo  Offline
Too Many Posts

Joined: Feb 2003
Posts: 21,318
Manitoba, Canada
For what you'd spend on an aftermarket system, you'd be better off picking up a 1995 or older jeep (any model) with the 4.0 and swap the engine in. A 4.0 will drop in where that 4.2 is right now. You'll gain 70hp. I suggest the 95 or older models because their OBD-1 EFI engine harness is very easy to reverse engineer and transplant. I did this swap in my 88 YJ Wrangler. Junked the bagged out 258 and dropped in a 99 dakota 5.2 magnum and used a 95 grand cherokee engine harness. I think the weight is about the same or lighter as my front end seems to sit a smidge higher now than it did with the old 258!

Re: Jeep CJ 258 - EFI upgrade [Re: Choppintime] #1800240
04/10/15 01:32 PM
04/10/15 01:32 PM
Joined: Feb 2012
Posts: 637
SoMd, USA
1
135sohc Offline
mopar
135sohc  Offline
mopar
1

Joined: Feb 2012
Posts: 637
SoMd, USA
A good chunk of the price on the Mopar EFI system is that magic 'emissions compliant' certification… Depending upon requirements of where you live keep those in mind if this is a registered vehicle that gets driven on the road.







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