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Unread 09-08-2011, 08:01 PM   #466
leftlanetruckin
XJ on 37's
 
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1998 XJ Cherokee 
 
Join Date: Jul 2006
Location: missouri via blackpool,lancs.
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Quote:
Originally Posted by titosgreen95yj View Post
ok i got a riddle maybe someone can answer....
tbi 5.7 4l60e motor runs good... sorta...
runs great shifts great, smooth throttle response... until i hit around 40mph the motor just cuts off, coasts for a while and then comes right back on...no regard for the throttle position. if i turn it off it starts right back up...
i dont think its a fuel issue, it idles smooth, no hesitiation, theres no loss of power before it happens, it just very cleanly cuts out and comes back on, no missing, no backfiring, no surging.. if i stomp on it gets it... if im in neutral or park it revs cleanly up to the rev limiter and back down to idle with absolutely no problems...it seems like it only relates to the speed im traveling, whether up hill down hill, its strange...i would think if it was the ignition module or cap or rotor it would be throughout the rpm range... but its fine unless im around 40mph... im stumped.. any ideas?
Have you checked fuel pressure? Checked injector pulse with noide lights?
You could try to unplug the vss and see what happens there I guess.
How come the 4L60E with a TBI motor? Thought all TBI's had the 700R4... At least all the ones I have done (TBI's) had a 700R4.
How is the rig wired up? Park/Neutral switch in place or bypassed? Torque converter lockup wired in correctly?

Martin

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1998 XJ on 37's.JK Rubi axles with chromo shafts and ctm's, 4:1 transfer case, etc etc etc.The Cherylkee....
2003 Range Rover HSE, 4.4 Quad Cam.
1998 Range Rover 4.6 HSE
2000 4.7 4WD WJ with a rebuilt motor.
4.3/700r4/new frame buildup (YJ)....
http://www.jeepforum.com/forum/f12/swap-offically-underway-324622/

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Unread 09-09-2011, 03:57 PM   #467
titosgreen95yj
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1995 YJ Wrangler 
 
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The blazer came stock with it...93 was the first year ... The 700r4 and 4l60e are more or less identical the exception being the PCM controlling the shifting.. 93-95 would have been the only years of tbi because beyond that was the start of the vortec motors... Neutral switch bypassed.. Lock up nOt hooked up.. The instructions said it was optional... I think I found the issue I had the motor harness wired up to the 12v interior 12v used for the gauges and wat not... That 12v was running the ECM, ignition, injectors and fuel pump. As I was driving today it died died on me gave it all a once through.. Blew my ignition fuse.. Then it dawned on I probably have too much junk fightin for current through a 15a fuse... So I'm either going hook it up to a separate high amp switch or a relay... Hopefully thAt will fix me right up
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Unread 09-18-2011, 03:12 PM   #468
cjevy350
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ok, well, i did it, got some free time and got off my butt!!....kind of, still have not finnished, shifter houseing, reverse lights, tyeing up all wires and other small things but im driving it every day to work,, runs great/shifts fine(o.d. works too)
img_5560.jpg   img_5561.jpg   img_5563.jpg   img_5564.jpg   img_5565.jpg  

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Unread 09-18-2011, 03:18 PM   #469
cjevy350
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the 3rd pict, shows the jeep sending unit for the temp guage and the 2 fittings i used ,, i wanted to keep the jeep guages,,,i also removed the oil sending unit off the chevy, installed the jeep on for the guage to work right, i had to splice the 2 wires together for the fuel pump to work,, it comes on any time the key is on...if i loose oil pressure ... it keeps running and its up to me to see the guage and shut it down,,,,just like to old days,, no bigie!!
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Unread 09-18-2011, 03:25 PM   #470
cjevy350
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i had to have the rear driveshaft made($255.00) and the true dual exhaust was $550..just some of the things i cant do at home.. i did have a fan shroud, 20" round and bolted to the stock rad, but i think the motor mounts setteld(?) in and it was hitting on the right side so its out for now, plus w/ the cold weater coming in im not worried now,,,, if any one needs help,just ask, ill do my best,,and there are many people here willing to help out too....now more big picts
img_5566.jpg   img_5567.jpg   img_5568.jpg   img_5569.jpg   img_5570.jpg  

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Unread 12-14-2011, 05:48 PM   #471
cjevy350
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well, its got some miles on it now and things are good...did some normal things ,oil change,trans service,bla,bla,, then i had to do , rear brakes, then a trans flush and refill, add in a trans cooler(to keep temps down), set base idle ,install K&N air filter,,,now it starts like it should(not touching the gas) and doesnt try to "walk" away at stop lights w/ both feet on the brakes..and im getting about 15.8 mpg w/ the stock tires on,, maybe more tweeking will help. but its my D.D. and i cant have it down for long,,,have a good christmas everyone and ill be back soon w/ more updates...
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Unread 09-18-2012, 07:39 PM   #472
Yarz
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1990 YJ Wrangler 
 
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Quote:
Originally Posted by leftlanetruckin View Post
me n stacy got her turning over, and the fuel pump is priming!!!!!!
what a relief!
got me physically aroused when i heard the fuel pump prime up.....
How does the painless harness power the fuel pump relay? Is it powered by the computer, as in a stock chevy configuration, OR is it powered by a hot in start and run wire?

Mine (5.7, but same basic thing..) primes for the 2 or so seconds, but then doesn't pump anymore. I either need to figure out why the computer doesn't send the signal to the relay after priming, or change the wiring to make it hot in start/run. I'd prefer the first, but if painless does the latter, then I know it is ok to do if I have to

Thanks in advance
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1990 White YJ TBI350, SM465, NP231, SOA, RE 1.5" SOA springs, Ford 8.8, D30, 4.10's, JBConversions SYE, XJ shaft, Bilstein 5150s, jb4x4 steering, MORE SS brakelines, 35x12.50 15 MT's, '95 YJ Brake Booster, '78 Grand Marquis MC, ZJ Prop. Valve
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Unread 09-20-2012, 07:57 AM   #473
leftlanetruckin
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If it is priming, are the injectors firing/pulsing?
Check with noide lights and report back.
As far as the fuel pump power, I would say the ecm is controlling the fuel pump wiring myself.
Mind, a fone call to Painless would also answer all your questions, and probably find a solution to your issues

Martin
__________________
1998 XJ on 37's.JK Rubi axles with chromo shafts and ctm's, 4:1 transfer case, etc etc etc.The Cherylkee....
2003 Range Rover HSE, 4.4 Quad Cam.
1998 Range Rover 4.6 HSE
2000 4.7 4WD WJ with a rebuilt motor.
4.3/700r4/new frame buildup (YJ)....
http://www.jeepforum.com/forum/showthread.php?t=324622

Years to gain the hands on experience, and offer it freely.
Minutes to gain the knowledge from the internet, and quote it just as freely.
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Unread 09-20-2012, 05:52 PM   #474
Yarz
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1990 YJ Wrangler 
 
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Figured out the pump was actually pumping (oops), but one injector is not firing. I can see the gas from the one, but not the second. It has power, though, so it must just be frozen. Thanks!
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"Build a man a fire, and he'll be warm for a day. Set a man on fire, and he'll be warm for the rest of his life."

1990 White YJ TBI350, SM465, NP231, SOA, RE 1.5" SOA springs, Ford 8.8, D30, 4.10's, JBConversions SYE, XJ shaft, Bilstein 5150s, jb4x4 steering, MORE SS brakelines, 35x12.50 15 MT's, '95 YJ Brake Booster, '78 Grand Marquis MC, ZJ Prop. Valve
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Unread 12-25-2012, 06:36 AM   #475
cjevy350
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merry christmas to all....
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Unread 12-25-2012, 08:55 AM   #476
leftlanetruckin
XJ on 37's
 
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Quote:
Originally Posted by cjevy350 View Post
merry christmas to all....
And to you too!
Currently working on a built LM7 into a 1998 Range Rover!
Made this adapter plate myself to mate the 4L60E bellhousing to the ZF4HP24 tranny. And this, children, is why we ALWAYS try to use the tranny that came with the engine we want! Torque converter to flywheel adapter, centering tube to the crank, spacer for the motor to bell housing, and so on. PIA.
adapter-resize.jpg

motor-built.jpg

Martin
__________________
1998 XJ on 37's.JK Rubi axles with chromo shafts and ctm's, 4:1 transfer case, etc etc etc.The Cherylkee....
2003 Range Rover HSE, 4.4 Quad Cam.
1998 Range Rover 4.6 HSE
2000 4.7 4WD WJ with a rebuilt motor.
4.3/700r4/new frame buildup (YJ)....
http://www.jeepforum.com/forum/showthread.php?t=324622

Years to gain the hands on experience, and offer it freely.
Minutes to gain the knowledge from the internet, and quote it just as freely.
Choose wisely!
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Unread 12-08-2013, 12:19 PM   #477
lovett86
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1990 YJ Wrangler 
 
Join Date: Oct 2011
Location: brantford, ontario
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havent read your whole thread yet, but i like the idea of a 4.3L swap, ive read a few already and they all seem interesting
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its a rusty one

http://www.jeepforum.com/forum/f22/90-yj-frame-swap-build-up-1434246/
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Unread 12-08-2013, 12:44 PM   #478
YJames90
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Location: Dutchess County, NY
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Quote:
Originally Posted by lovett86 View Post
havent read your whole thread yet, but i like the idea of a 4.3L swap, ive read a few already and they all seem interesting
You can check out my thread too in my signature. Theres right and wrong ways to do it.
All the right ways are from the guidance of Martin and a few others on here
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Quote:
Originally Posted by Poke View Post
Spring Over is not for you.... yet





My 2.5 to 4.3 swap thread
http://www.jeepforum.com/forum/f12/4...begun-1237704/
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Unread 12-08-2013, 02:48 PM   #479
lovett86
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Quote:
Originally Posted by YJames90 View Post
You can check out my thread too in my signature. Theres right and wrong ways to do it.
All the right ways are from the guidance of Martin and a few others on here
ive actually read threw yours when u were doing it, im pretty sure i even commented on it once or twice, i had a 90 s10 with a 2.5L i was driving that i swapped a 4.3L into from a 93, loved the power differnce in it, i have a couple different v8s in my garage, but ive been thinking more and more about getting a donor and going with a whole 4.3L swap for my jeep once its all together
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its a rusty one

http://www.jeepforum.com/forum/f22/90-yj-frame-swap-build-up-1434246/
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Unread 12-08-2013, 03:15 PM   #480
YJames90
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Quote:
Originally Posted by lovett86 View Post
ive actually read threw yours when u were doing it, im pretty sure i even commented on it once or twice, i had a 90 s10 with a 2.5L i was driving that i swapped a 4.3L into from a 93, loved the power differnce in it, i have a couple different v8s in my garage, but ive been thinking more and more about getting a donor and going with a whole 4.3L swap for my jeep once its all together
Cool! You must be in the few others catagory
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Quote:
Originally Posted by Poke View Post
Spring Over is not for you.... yet





My 2.5 to 4.3 swap thread
http://www.jeepforum.com/forum/f12/4...begun-1237704/
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