89 4.2 to 96 XJ 4.0 Swap Thread w/ wiring - Page 3 - JeepForum.com
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Unread 11-29-2010, 08:48 PM   #31
green89yj
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1989 YJ Wrangler 
 
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Location: Georgia
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I will respond here again.
I am running both the upstream and downstream O2 sensors.
Just some useful information: I think we need to have about 34 psi on the fuel rail.

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WTS: 4.2 parts. Fuel lines, pump, block, head, accessories, just ask
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Unread 12-07-2010, 09:35 AM   #32
five-string
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Update...
jeep is running!

I have about 3 codes to deal with and a possible idle stepper problem (high idle) but wow! What a difference! Lots more power. And I am hoping better fuel economy.
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Unread 12-07-2010, 10:08 AM   #33
remmons
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Quote:
Originally Posted by five-string View Post
Update...
jeep is running!

I have about 3 codes to deal with and a possible idle stepper problem (high idle) but wow! What a difference! Lots more power. And I am hoping better fuel economy.
Great Job! We love to hear good news around here!
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Unread 12-16-2010, 06:37 AM   #34
green89yj
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let me know what you find on the high idle because my high idle only kicks in after the Jeep is warm. Right when i start it it idles like crap. What codes are you throwing?
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Herc.Custom Green paint. RC 4". 5 Goodyear 33X12.5 MT/R w/Kev. Cragar V5's. Corbeau Moab seats. Optima Yellow.XRC8 Comp Winch. XJ 4.0/AX15
WTT: 4" springs for 6"
WTS: 4.2 parts. Fuel lines, pump, block, head, accessories, just ask
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Unread 12-16-2010, 07:46 AM   #35
five-string
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1990 YJ Wrangler 
 
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Well, as it turns out, the high idle appeared after I thoroughly cleaned the throttle body. It seems all the crud in there was blocking the air flow at idle. When I removed all that dirt, air was able to move around the edges of the butterfly plate and the idle speed increased. When I held a finger on the edge of the plate it would block the leaking air and idle dropped.
I loosened the two screws and adjusted the plate so it closed better, adjusted the set screw for idle speed and I got the idle down to 800-900 rpms.

It still idles like I have a huge cam in it when I first start it up. And it goes right to the 800-900 rpms immediately which I think it should run faster at cold start up, shouldn't it? Then after about 30 seconds it settles into a smooth idle. I haven't checked codes lately. But what baffles me is the Jeep doesn't start up or run any different after I clear the ecm by disconnecting the battery. It seems it is not learning anything over time. Does my ecm have a learning disability? I would really like to figure out this rough cold idle problem.

Edit: I am only running the upstream o2 sensor. I don't have a cat or second o2 sensor bung.
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Unread 12-21-2010, 10:07 PM   #36
green89yj
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I would try to run that second o2 sensor. Is there any way for you to post up a video? I think mine is doing something similar.
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Herc.Custom Green paint. RC 4". 5 Goodyear 33X12.5 MT/R w/Kev. Cragar V5's. Corbeau Moab seats. Optima Yellow.XRC8 Comp Winch. XJ 4.0/AX15
WTT: 4" springs for 6"
WTS: 4.2 parts. Fuel lines, pump, block, head, accessories, just ask
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Unread 12-22-2010, 11:54 PM   #37
GAT72991
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1989 YJ Wrangler 
 
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Just in case you are still having problems with that lock cylinder, here's a good link i found a while back on steering columns...mainly to tighten them up but has awesome instructions to get to/remove the lock cylinder...etc.
BC4x4.COM four wheel drive, 4x4, offroad and fourwheeling site.
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Unread 12-23-2010, 01:06 PM   #38
five-string
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Quote:
Originally Posted by green89yj View Post
I would try to run that second o2 sensor. Is there any way for you to post up a video? I think mine is doing something similar.
I recorded a vid but the sound is not the best for hearing the rough idle. I will try again, concentrating on the exhaust.
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Unread 12-24-2010, 04:49 AM   #39
dodger889
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Oh just incase you don't not know a fI engine will idle about the same rpm cold or hot. Not like a carbed engine that has to have a higher idle speed for over coming a choke.
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A 89 yj with a 4.0 aw4 sye out of an 92xj. Now the hard part is done time to get it up in the air just a bit. Working on 8.8 with 3.73 and lsd for the rear. and new D30 hp with 3.73 .
For those who have not figured this out I'm old school but can handle the new too.
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im just cheap, and cheap makes you creative.
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Unread 01-09-2011, 09:17 PM   #40
green89yj
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Quote:
Originally Posted by dodger889 View Post
Oh just incase you don't not know a fI engine will idle about the same rpm cold or hot. Not like a carbed engine that has to have a higher idle speed for over coming a choke.
Right, but right when they start up don't they run high for a couple seconds just to warm up a little.
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Herc.Custom Green paint. RC 4". 5 Goodyear 33X12.5 MT/R w/Kev. Cragar V5's. Corbeau Moab seats. Optima Yellow.XRC8 Comp Winch. XJ 4.0/AX15
WTT: 4" springs for 6"
WTS: 4.2 parts. Fuel lines, pump, block, head, accessories, just ask
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Unread 01-10-2011, 07:35 PM   #41
dodger889
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If I think about it is just a touch higher but only a couple hundred rpm. Not really enough to call it high.
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A 89 yj with a 4.0 aw4 sye out of an 92xj. Now the hard part is done time to get it up in the air just a bit. Working on 8.8 with 3.73 and lsd for the rear. and new D30 hp with 3.73 .
For those who have not figured this out I'm old school but can handle the new too.
Quote:
Originally Posted by bigsquat View Post
im just cheap, and cheap makes you creative.
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Unread 02-15-2011, 06:20 PM   #42
green89yj
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Not like a 1800 RPM high idle but noticeably higher.
I'm still having very similar symptoms and haven't had time to trouble shoot.
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Build
Herc.Custom Green paint. RC 4". 5 Goodyear 33X12.5 MT/R w/Kev. Cragar V5's. Corbeau Moab seats. Optima Yellow.XRC8 Comp Winch. XJ 4.0/AX15
WTT: 4" springs for 6"
WTS: 4.2 parts. Fuel lines, pump, block, head, accessories, just ask
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242 , 4.0 , 4.0 swap , asd , wiring diagram

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