4.2L Fuel Injection and Build - Page 12 - JeepForum.com
Search  
Sign Up   Today's Posts
User: Pass: Remember?
Advertise Here
Jeep Home Jeep Forum Jeep Classifieds Jeep Registry JeepSpace Jeep Reviews Jeep Gallery Jeep Clubs Jeep Groups Jeep Videos Jeep Events Jeep Articles
Go Back JeepForum.com > Models > Jeep Wrangler Forums > YJ Wrangler Technical Forum > 4.2L Fuel Injection and Build

Introducing MONSTALINER™ UV Permanent DIY Roll On Bed LineThe Solution to Radius Arm Bind - Meet Lock-N-LoadFS: Jeep Fog Light LED Bulbs! Several Brightness Options!

Reply
Unread 09-07-2011, 08:57 AM   #166
flyin8s234
Registered User
1984 CJ7 
 
Join Date: Sep 2009
Location: Marquette
Posts: 56
cevans87,
So I have put about 3000 miles on my MPI 258 and have loved every single one of them, but recently i have been noticing some blue smoke coming from the tailpipe on start up and when i press the gas and the rpms jump. If i hold the rpm's up, i can't see the smoke. This problem just started after i got my oil changed, I'm not sure if that has anything to do with it; the shop put 5W 30 when i told them to use 10W 30 and I'm not sure if they used synthetic or not (i hope not) .
Any ideas?
Also, I haven't seemed to loose any power since the problem started.
Thanks

flyin8s234 is offline   Reply With Quote Quick reply to this message
Unread 09-07-2011, 02:27 PM   #167
cevans87
Registered User
1992 XJ Cherokee 
 
Join Date: Nov 2008
Location: , North Carolina
Posts: 411
Blue smoke is most commonly seen in turbo asperated motors, its a mix of water and oil being burned in the combustion chamber... I would start by doing a leak down test on the cylinder head... Sounds like oil entering the chamber through bad valve seals and or maybe the water jackets didnt seal up quite good enough on the head... Just a place to start
__________________
Built Not Bought #447, 1992 Jeep XJ Supercharged 4.7, 1988 Jeep YJ Auto 4.2L, 2008 Commander Limited HEMI, 1990 Jeep YJ 4.7L Fuel Injected AW4, 1981 Scrambler 304 Auto

I Am The Jeep Surgeon!!!
cevans87 is offline   Reply With Quote Quick reply to this message
Unread 09-11-2011, 05:33 PM   #168
cevans87
Registered User
1992 XJ Cherokee 
 
Join Date: Nov 2008
Location: , North Carolina
Posts: 411
Updated Pictures !!! Where we stand right now !!!
2011-09-11-15.44.35.jpg   2011-09-11-15.40.00.jpg   2011-09-11-15.41.53.jpg   2011-09-11-15.45.08.jpg   2011-09-11-15.41.28.jpg  

__________________
Built Not Bought #447, 1992 Jeep XJ Supercharged 4.7, 1988 Jeep YJ Auto 4.2L, 2008 Commander Limited HEMI, 1990 Jeep YJ 4.7L Fuel Injected AW4, 1981 Scrambler 304 Auto

I Am The Jeep Surgeon!!!
cevans87 is offline   Reply With Quote Quick reply to this message
Unread 09-11-2011, 05:34 PM   #169
cevans87
Registered User
1992 XJ Cherokee 
 
Join Date: Nov 2008
Location: , North Carolina
Posts: 411
More Pictures
2011-06-25-15.16.09.jpg   2011-09-11-15.42.37.jpg   2011-09-11-15.43.25.jpg   2011-09-11-15.43.05.jpg   2011-07-12-19.14.59.jpg  

__________________
Built Not Bought #447, 1992 Jeep XJ Supercharged 4.7, 1988 Jeep YJ Auto 4.2L, 2008 Commander Limited HEMI, 1990 Jeep YJ 4.7L Fuel Injected AW4, 1981 Scrambler 304 Auto

I Am The Jeep Surgeon!!!
cevans87 is offline   Reply With Quote Quick reply to this message
Unread 09-11-2011, 05:36 PM   #170
cevans87
Registered User
1992 XJ Cherokee 
 
Join Date: Nov 2008
Location: , North Carolina
Posts: 411
Pictures
2011-09-11-15.43.44.jpg   2011-09-11-15.42.49.jpg   2011-05-06-06.36.55.jpg   2011-09-11-15.46.28.jpg   2011-09-11-15.40.38.jpg  

__________________
Built Not Bought #447, 1992 Jeep XJ Supercharged 4.7, 1988 Jeep YJ Auto 4.2L, 2008 Commander Limited HEMI, 1990 Jeep YJ 4.7L Fuel Injected AW4, 1981 Scrambler 304 Auto

I Am The Jeep Surgeon!!!
cevans87 is offline   Reply With Quote Quick reply to this message
Unread 09-11-2011, 05:38 PM   #171
cevans87
Registered User
1992 XJ Cherokee 
 
Join Date: Nov 2008
Location: , North Carolina
Posts: 411
Pictures !
2011-09-11-15.46.52.jpg   2011-09-10-21.43.48.jpg   2011-09-10-21.43.35.jpg   2011-09-04-03.16.52.jpg   2011-09-03-23.13.11.jpg  

__________________
Built Not Bought #447, 1992 Jeep XJ Supercharged 4.7, 1988 Jeep YJ Auto 4.2L, 2008 Commander Limited HEMI, 1990 Jeep YJ 4.7L Fuel Injected AW4, 1981 Scrambler 304 Auto

I Am The Jeep Surgeon!!!
cevans87 is offline   Reply With Quote Quick reply to this message
Unread 09-11-2011, 05:39 PM   #172
cevans87
Registered User
1992 XJ Cherokee 
 
Join Date: Nov 2008
Location: , North Carolina
Posts: 411
Pictures !!
2011-09-04-03.17.05.jpg   2011-09-03-23.13.11.jpg   2011-09-03-20.27.56.jpg   2011-09-11-15.40.23.jpg   2011-07-12-19.14.03.jpg  

__________________
Built Not Bought #447, 1992 Jeep XJ Supercharged 4.7, 1988 Jeep YJ Auto 4.2L, 2008 Commander Limited HEMI, 1990 Jeep YJ 4.7L Fuel Injected AW4, 1981 Scrambler 304 Auto

I Am The Jeep Surgeon!!!
cevans87 is offline   Reply With Quote Quick reply to this message
Unread 09-11-2011, 05:40 PM   #173
rfredrik
Registered User
1979 CJ7 
 
Join Date: Sep 2011
Location: Oxnard, CA
Posts: 6
Like I said, this is an awesome build. Your inbox is full and you were missing a digit.. lol
rfredrik is offline   Reply With Quote Quick reply to this message
Unread 09-11-2011, 05:55 PM   #174
cevans87
Registered User
1992 XJ Cherokee 
 
Join Date: Nov 2008
Location: , North Carolina
Posts: 411
Thanks Man, 4345820148
__________________
Built Not Bought #447, 1992 Jeep XJ Supercharged 4.7, 1988 Jeep YJ Auto 4.2L, 2008 Commander Limited HEMI, 1990 Jeep YJ 4.7L Fuel Injected AW4, 1981 Scrambler 304 Auto

I Am The Jeep Surgeon!!!
cevans87 is offline   Reply With Quote Quick reply to this message
Unread 09-13-2011, 11:09 PM   #175
94chb
Registered User
1989 YJ Wrangler 
 
Join Date: Dec 2009
Location: Whitwell, TN
Posts: 1,956
Quote:
Originally Posted by cevans87 View Post
you will need to get the following

91-95 4.0L Head from cherokee
91-95 complete wiring harness (under hood and going to the tranny and xcase) from cherokee
Vehicle Speed Sensor for a 91 YJ
4.0L Flywheel (91-95)
91-95 ECM from cherokee and same jeep you pulled harness off of
Crankshaft Position Sensor From a 4.0L (91-95)
Distributor from a 4.0L (91-95)
Intake and Exhaust from a 4.0L Exhaust (91-95) Intake (91-2006)
Throttle Body and Injectors from a 4.0L (91-95)
Fuel Pump Part Number SP736H from Advance Auto (this is the complete unit, pump, hanger, and sending unit)

Theres a few other things but there small and you will probably have them laying around anyways...

You can keep your auto, you only need to change out the flywheel...

Also as far as the wiring goes... leave your old harness in and lay the new one on top and just connect what you need to run the fuel injection, this will leave everything else the way it left from the factory, gauges will still work, ignition and so on... you only need 5 wires to run the fuel injection....
ok i got ahold of a 93 cherokee, buddy is parting out and said i can have everything i need for $150, will i also need throttle cable,trans kick down cable and anything else you can think of i need to grab while im there? also will i keep my same setup with the serpintine belt or will i need to change everything over to v-belt?
94chb is offline   Reply With Quote Quick reply to this message
Unread 09-14-2011, 07:38 AM   #176
cevans87
Registered User
1992 XJ Cherokee 
 
Join Date: Nov 2008
Location: , North Carolina
Posts: 411
Throttle cable yes, but it will have a lot of slack u need to take out,but will work...

Trans kickdown... I dont know you will provably have to fabricate something for that...

Grab anything you think u will need, all electrical, connectors, fuel filter bracket, cruise, vaccum hoses, steering hoses, anything you can really... Better to have it and not need it...

Oh and grab to map sensor off the firewall... U will need that
__________________
Built Not Bought #447, 1992 Jeep XJ Supercharged 4.7, 1988 Jeep YJ Auto 4.2L, 2008 Commander Limited HEMI, 1990 Jeep YJ 4.7L Fuel Injected AW4, 1981 Scrambler 304 Auto

I Am The Jeep Surgeon!!!
cevans87 is offline   Reply With Quote Quick reply to this message
Unread 10-06-2011, 11:22 PM   #177
lclark2074
Registered User
1990 YJ Wrangler 
 
Join Date: Nov 2008
Location: RI
Posts: 681
Quote:
Originally Posted by cevans87 View Post
so i got a wild hair up my a$$ and decided recently to do a lot of junkyard upgrades... such as rear view mirror with map lights which is awsome... also since i have a cherokee wiring harness on my stroker, i decided to grab a electric cherokee fan and install it as a puller since i already have a pusher... works awsomely... and plugs right in... another cool thing i found was a retractable underhood work light from a chevy pickup... works like a champ...

now a few days ago we went home to see some family and virginia... me being the true jeeper i am... decided i would pack a bag with a few tools and hit the junkyard saturday morning to see if i could find some goodies...

and I did !!!!

i found a lifted JK that had been wrecked...

i snagged the electric swaybar disconnect, the aftermarket wheel spacers, the subwoofer, the front seats, and the AEV snorkle... and i know your thinking wow this dude hit the mother load... well after the parts were off i was on my way... came across a grand cherokee with the 5.9L, went to snag the alternator, and guess what... it was still there but it didn't look stock... it was a 250amp Powermate by Wrangler... I walked out and only spent $25 all together!!!!!!

So i got home and decided I would go ahead and put the *direct* swap alternator in... ummmmm not so fast.... what i failed to realize is that since my motor originally started life in a 1996 cherokee, it would in fact not bolt right up and i needed to grind some metal off the block and alternator mount.... after a few hours, she's is in and I'm happy to say she works ! i can cut everything on in the truck and never see the needle fall once... here are some pictures for those of you who want the bigger alternator...

the stock alternator on the 4.0L is a teeny 90 amp... for those of us who don't have tons of cash... you can go to the junkyard and snatch a alternator out of

136 amp alternator*:

1996-1998 Dodge B.Series Van - (PN:56027913 Reman:R6027913)
1996-1998 Dodge Dakota 3.9L, 4.7L, 5.9L - (PN:56027913 Reman:R6027913)
1998-2000 Dodge Dakota - (PN:56027913AB Reman:R6027913AC)
2003-2005 Dodge Dakota 3.9L, 4.7L, 5.9L - (PN:56041693AC Reman:R6041693AC)
1998-1999 Dodge Durango - (PN:56027913 Reman:R6027913)
1996-1998 Dodge Ram Pickup - (PN:56027913 Reman:R6027913)
1998-2000 Dodge Ram Pickup - (PN:56027913AB Reman:R6027913AC)
1991-1998 Jeep Grand Cherokee - (PN:56005685 Reman:R6005685)
2000 Jeep Grand Cherokee 4.7L - (PN:56041324AC Reman:R6041324AC)
2001-2005 Jeep Grand Cherokee 3.9L, 4.7L, 5.9L - (PN:56041693AC Reman:R6041693AC)

150 amp alternator*:

1993-1998 Jeep Grand Cherokee - (PN:56041394AA Reman:R6041394AA)

160 amp alternator*:

2001-2005 Dodge Dakota - (PN:56029914AA Reman:R6029914AA)
2001-2005 Dodge B.Series Van - (PN:56029914AA Reman:R6029914AA)


wich feld termenal is + and wich termenal is feld control pin20 on the computer. sorry the pics didnot come thru
__________________
night crew 226
http://www.jeepforum.com/forum/f12/f...l-box-1471348/
lclark2074 is offline   Reply With Quote Quick reply to this message
Unread 10-07-2011, 09:38 AM   #178
remmons
Some assembly required.
2002 KJ Liberty 
 
Join Date: Mar 2010
Location: Vernal, Utah
Posts: 1,738
Quote:
Originally Posted by 94chb View Post
ok i got ahold of a 93 cherokee, buddy is parting out and said i can have everything i need for $150, will i also need throttle cable,trans kick down cable and anything else you can think of i need to grab while im there? also will i keep my same setup with the serpintine belt or will i need to change everything over to v-belt?
I have not followed on this build for a while now, so I will be in the dark on some of this.

I have performed an EFI conversion on my '88 4.2L by using a PCM, wiring, and fuel system from a '93 4.0L HO XJ. This is what I have learned in the process.

Are you using your 4.2L block? Are you going with the serpentine system or are you keeping the V-belt system? The reason that I am asking is this, The 4.2L engine is externally balanced, meaning that the flywheel and the Harmonic Balancer are weighted. The 4.0L engines are internally balanced, thus the flywheel and the harmonic balancer are not weighted, they are balanced. If you are keeping the 4.2L and the serpentine system, you will need to get an HB from an '88 4.2L that came with a serpentine system. You will also need to use the flywheel from the 4.2L as well. Other wise, you will be experiencing a rhythmic vibration from the motor like I am, which in time will destroy your motor. Unfortunately, I am running an AW4 automatic tranny, so there is no weighted flex-plate for my application that will work (that I am aware of at this time).


Quote:
Originally Posted by cevans87 View Post
Throttle cable yes, but it will have a lot of slack u need to take out,but will work...

Trans kickdown... I dont know you will provably have to fabricate something for that...

Grab anything you think u will need, all electrical, connectors, fuel filter bracket, cruise, vaccum hoses, steering hoses, anything you can really... Better to have it and not need it...

Oh and grab to map sensor off the firewall... U will need that
X2 on grabbing everything that you can. If you have the whole donor vehicle, this makes things a whole lot easier. I ordered a throttle cable for a 91-95 wrangler for my '88. It worked just fine.
__________________
2002 Liberty Sport 3.7. 2.5" lift.

I am by no means a professional. I know just enough to get myself into trouble.

http://www.jeepforum.com/forum/f12/i...t-case-989208/
remmons is offline   Reply With Quote Quick reply to this message
Unread 10-07-2011, 09:42 AM   #179
remmons
Some assembly required.
2002 KJ Liberty 
 
Join Date: Mar 2010
Location: Vernal, Utah
Posts: 1,738
I wanted to throw this in while I was thinking about it. Click on my link at the bottom on Project: Basket Case and go to page 13. There you will see where I am at on my project, and how I have run into some issues that need addressed.
__________________
2002 Liberty Sport 3.7. 2.5" lift.

I am by no means a professional. I know just enough to get myself into trouble.

http://www.jeepforum.com/forum/f12/i...t-case-989208/
remmons is offline   Reply With Quote Quick reply to this message
Unread 10-07-2011, 10:05 AM   #180
94chb
Registered User
1989 YJ Wrangler 
 
Join Date: Dec 2009
Location: Whitwell, TN
Posts: 1,956
thanks for the info , but i came across an easier cheapier route, i grabbed a 91 wrangler 4.0 fuel injected, 5 speed. for..................$500 and ive got the tub and frame sold for $300 so im only gonna have $200 into the whole swap from carb to fuel injection and from auto to 5 speed

and everything should just bolt up since everything is coming from a wrangler, heres a pic of what i got. everything is there but the rear end.



Quote:
Originally Posted by remmons View Post
I have not followed on this build for a while now, so I will be in the dark on some of this.

I have performed an EFI conversion on my '88 4.2L by using a PCM, wiring, and fuel system from a '93 4.0L HO XJ. This is what I have learned in the process.

Are you using your 4.2L block? Are you going with the serpentine system or are you keeping the V-belt system? The reason that I am asking is this, The 4.2L engine is externally balanced, meaning that the flywheel and the Harmonic Balancer are weighted. The 4.0L engines are internally balanced, thus the flywheel and the harmonic balancer are not weighted, they are balanced. If you are keeping the 4.2L and the serpentine system, you will need to get an HB from an '88 4.2L that came with a serpentine system. You will also need to use the flywheel from the 4.2L as well. Other wise, you will be experiencing a rhythmic vibration from the motor like I am, which in time will destroy your motor. Unfortunately, I am running an AW4 automatic tranny, so there is no weighted flex-plate for my application that will work (that I am aware of at this time).

my 89 wrangler 4.2 came with the serpentine belt system, im gonna put the motor in my shed and rebuild it and put a 4.0 head on it during the winter and eventually put it back in my wrangler and keep the fuel injection system.
94chb is offline   Reply With Quote Quick reply to this message
Reply

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the JeepForum.com forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid e-mail address for yourself.
Note: All free e-mails have been banned due to mis-use. (Yahoo, Gmail, Hotmail, etc.)
Don't have a non-free e-mail address? Click here for a solution: Manual Account Creation
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.


Thread Tools


Suggested Threads





Jeep, Wrangler, Cherokee, Grand Cherokee, and other models are copyrighted and trademarked to Jeep/Chrysler Corporation. JeepForum.com is not in any way associated with Jeep or the Chrysler Corp.