1997 Jeep Cherokee LS1 conversion
On The Tree
Joined: Apr 2010
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Thread Starter
On The Tree
Joined: Jun 2009
Posts: 194
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From: colorado Springs
Drove the XJ up and down the driveway. Nice to actually have it moving under it's own power again.
Fighting a wiring problem though. Seems my Harnes/PCM combor came from a bastaed child Tahoe. All of the schematics I've seen show a specific wire at a specific location to unlock the torque converterwhen the brake pedal is pushed (just like an XJ). Problem is, my PCM connector is missing this wire (TCC Brake). I've narrowed it down to having something to do with Cruise Control. I'm pretty sure the donor rig had it, so i've been poring over the applicable drawings. Sent an email to Brendan at www.ls1swap.com . Hopefully he'll have a quick and easy answer for me.
Fighting a wiring problem though. Seems my Harnes/PCM combor came from a bastaed child Tahoe. All of the schematics I've seen show a specific wire at a specific location to unlock the torque converterwhen the brake pedal is pushed (just like an XJ). Problem is, my PCM connector is missing this wire (TCC Brake). I've narrowed it down to having something to do with Cruise Control. I'm pretty sure the donor rig had it, so i've been poring over the applicable drawings. Sent an email to Brendan at www.ls1swap.com . Hopefully he'll have a quick and easy answer for me.
Thread Starter
On The Tree
Joined: Jun 2009
Posts: 194
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From: colorado Springs
Finally!!!
http://s55.photobucket.com/albums/g1...t=Roadtest.flv
Still having throttle issues but hope have that resolved in a couple days.
If the damn weather would cooperate I'd be able to genetrate a little work and be able to get my darn gauges too.
http://s55.photobucket.com/albums/g1...t=Roadtest.flv
Still having throttle issues but hope have that resolved in a couple days.
If the damn weather would cooperate I'd be able to genetrate a little work and be able to get my darn gauges too.
TECH Resident
Joined: Nov 2009
Posts: 751
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Im doing this swap.. Staying with the Jeep 5 speed though.. You have given me inspiration. I am going to be recieving the AX15- GM adapter from Novak on Thursday and will be starting a build thread then.. My engine is a 98 Vette LS.. Im going to attempt to use the stock jeep alternator and PS pump and no other accessories.. Hope it all works .. LOL
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Teching In
Joined: Apr 2010
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TECH Resident
Joined: Nov 2009
Posts: 751
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Yeah they are tough.. I read that they are stronger than a T-5 by a long shot and my 86 El camino has a 400HP small block and a T-5 in it and i beat the crap out of it for two years so far and it hasnt busted.. But neither has the 7.5 LOL
I think it will be a fun toy..
Light weight+4wd+geared+ARB lockers = Honda killer!!
I think it will be a fun toy..
Light weight+4wd+geared+ARB lockers = Honda killer!!
Thread Starter
On The Tree
Joined: Jun 2009
Posts: 194
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From: colorado Springs
I'm really getting frustrated with this project. I'm still having the same ******' error code pop up constantly........and please pardon the language. I'm resigned to owning 4k lb piece of garage art at this point. I just sent Brendan Patton (www.ls1swap.com) the following and hope that he can get me pointed in the right direction.
If anyone has some brilliant insight or even a Scientific Wild Ass Guess, well I'm all ears.
HELP!
I'm really stumped and would like to tap into your expertise.
Here's the problem...P1518, over and over and over again. When I start the engine I get no throttle response at all. My first thought was a bad TAC Ground but that turned out not to be the case. I was able to get it the sporadically but that only lasted for a couple days. I've already tried a new (used actually) TAC Module with the same results.
my next step was to confirm proper wiring and voltage to the TAC module. 12vdc at Key On and 14+ vdc with the engine running.
Now the only way to get the throttle to respond to the peddle is to clear the code with an OBDII scanner. I can do it with the engine running and can hear a definite change in RPM's and then the peddle will work. I can drive the Jeep a little bit bt the code comes right back and I have the same problem when I try to restart the engine again.
AAARRGGGHHH!!
The only other error code I'm getting is a P0650 (MIL Control Malfunction). My sanner reports the error but when I test the mill circuit with the scanner it reports that the MIL should be off and the circuit is functioning properly
Lastly, major shifting issues.
I can get the Jeep up to around 20 Mph or so and it won't shift beyond second gear. I do have 12vdc to the tranny and 12vdc thru the normally closed contacts on my brake peddle switch. I have an OEM VSS located in the output shaft housing of my transfercase. I've also connected the 4wd circuit so that the PCM knows I'm not in 4WD.
Your thoughts?
I'm really getting depressed about this whole project to be quite honest and don't foresee ever driving the Jeep at this point.
I'm really stumped and would like to tap into your expertise.
Here's the problem...P1518, over and over and over again. When I start the engine I get no throttle response at all. My first thought was a bad TAC Ground but that turned out not to be the case. I was able to get it the sporadically but that only lasted for a couple days. I've already tried a new (used actually) TAC Module with the same results.
my next step was to confirm proper wiring and voltage to the TAC module. 12vdc at Key On and 14+ vdc with the engine running.
Now the only way to get the throttle to respond to the peddle is to clear the code with an OBDII scanner. I can do it with the engine running and can hear a definite change in RPM's and then the peddle will work. I can drive the Jeep a little bit bt the code comes right back and I have the same problem when I try to restart the engine again.
AAARRGGGHHH!!
The only other error code I'm getting is a P0650 (MIL Control Malfunction). My sanner reports the error but when I test the mill circuit with the scanner it reports that the MIL should be off and the circuit is functioning properly
Lastly, major shifting issues.
I can get the Jeep up to around 20 Mph or so and it won't shift beyond second gear. I do have 12vdc to the tranny and 12vdc thru the normally closed contacts on my brake peddle switch. I have an OEM VSS located in the output shaft housing of my transfercase. I've also connected the 4wd circuit so that the PCM knows I'm not in 4WD.
Your thoughts?
I'm really getting depressed about this whole project to be quite honest and don't foresee ever driving the Jeep at this point.
My scientific wild guess... http://www.gearchatter.com/viewpost12574.php
Does your MIL light actually work? Can you control it through the PCM? During early testing I didn't have the MIL hooked up and things were strange... I would clear codes and they would come back almost immediately, etc. Hooked up the light and a lot of weird and intermittent codes went away.
Hope this helps.
Does your MIL light actually work? Can you control it through the PCM? During early testing I didn't have the MIL hooked up and things were strange... I would clear codes and they would come back almost immediately, etc. Hooked up the light and a lot of weird and intermittent codes went away.
Hope this helps.
Thread Starter
On The Tree
Joined: Jun 2009
Posts: 194
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From: colorado Springs
Thanks for the link!
No gauges or lamps (indicators) at this time. I'll hook one up to the MIL icrcuit and see what happens.
Brendan replied to my email and gave me a couple things to look at. I'll post up his info and my results should things work out.
No gauges or lamps (indicators) at this time. I'll hook one up to the MIL icrcuit and see what happens.
Brendan replied to my email and gave me a couple things to look at. I'll post up his info and my results should things work out.
Thread Starter
On The Tree
Joined: Jun 2009
Posts: 194
Likes: 0
From: colorado Springs
So after doing a little research, pouring over schematics and some very useful info from Brendan (www.ls1swap.com) I got the No Throttle issue resolved. Seems that if the PCM is powered up before the TAC Module, even by a millisecond, the PCM reports that the TAC is not communicating with the PCM. Clearing code while the engine is running allows the throttle to start functioning normally. A simple swap of 2 wires to allow the TAC to energize first cured the problem.
After checking the the wiring for the VSS for the umpteenth time I finally figured out that a VSS from a 97 or older GM simply won't work. The magnet in the VSS is much weaker and although I was getting a signal from the VSS to the PCM it wasn't what the PCM needed to see.
I picked up a new VSS and connector from the local parts house and surprise!!!!....it's a larger diameter than the '95 version. Since I'm a cheap S.O.B. I wasn't about to shell out more coin for another tail cone nor was I thrilled about buying another high dollar tap for 1 stinkin' hole.
My solution was to first determine the thread size, turns out to be a 22mm-1.5 which equals a 7/8-18. Sweet!! I figured I'd just buy a 7/8-18 bolt and booty fab a tap out of it. Wrong! Ever try to find a 7/8-18 bolt? They don't exist on my planet.
Hmmmm.....what to do, what to do? FZZZZZZZZZZZPLAT!! (That's the sound of a light bulb going on over my noggin, just like in the cartoons. ) chevy 3/4 ton tie-rod ends are 7/8-18! I threaded the new VSS into the jamb nut of my trail spare and it's a darn near perfect fit.
So I cut the TRE apart, weld a nut to it, cut a few grooves up the threads and bored out the tail cone on my drill press. The "tap" worked well in the soft aluminum and I had everything back together in no time last night.
Got up this AM and fired up the motor, turned on my speed-oh-meter (GPS for now) and slipped it into gear. drove around the neighborhood a little bit, seemed to shft just fine. Made my way to a road with a higher speed limit (45) and sped up and slowed down multiple times....shifted fine. So I cruise along at 40-45 and everything is working well, so it's time to really open it up. Yeah baby, I'm talking 55MPH here!!
I get to a stoplight and and make my gentle left turn and scan the road and gave the skinny peddle a tiny itsy-bitsty nudge.
Ho
Lee
****!
When I said tiny itsy-bitsty nudge I meant tiny itsy-bitsty nudge but based on the amount of time it took to exceed the posted speed limit (damn near 80mph) you'd think I put my foot through the floor. Jeebus H. Tap Dancin' Christ! This thing is a-freakin'-mazing. The available power is simply phenomenal!!
Wow! Just freakin' wow!!!
After checking the the wiring for the VSS for the umpteenth time I finally figured out that a VSS from a 97 or older GM simply won't work. The magnet in the VSS is much weaker and although I was getting a signal from the VSS to the PCM it wasn't what the PCM needed to see.
I picked up a new VSS and connector from the local parts house and surprise!!!!....it's a larger diameter than the '95 version. Since I'm a cheap S.O.B. I wasn't about to shell out more coin for another tail cone nor was I thrilled about buying another high dollar tap for 1 stinkin' hole.
My solution was to first determine the thread size, turns out to be a 22mm-1.5 which equals a 7/8-18. Sweet!! I figured I'd just buy a 7/8-18 bolt and booty fab a tap out of it. Wrong! Ever try to find a 7/8-18 bolt? They don't exist on my planet.
Hmmmm.....what to do, what to do? FZZZZZZZZZZZPLAT!! (That's the sound of a light bulb going on over my noggin, just like in the cartoons. ) chevy 3/4 ton tie-rod ends are 7/8-18! I threaded the new VSS into the jamb nut of my trail spare and it's a darn near perfect fit.
So I cut the TRE apart, weld a nut to it, cut a few grooves up the threads and bored out the tail cone on my drill press. The "tap" worked well in the soft aluminum and I had everything back together in no time last night.
Got up this AM and fired up the motor, turned on my speed-oh-meter (GPS for now) and slipped it into gear. drove around the neighborhood a little bit, seemed to shft just fine. Made my way to a road with a higher speed limit (45) and sped up and slowed down multiple times....shifted fine. So I cruise along at 40-45 and everything is working well, so it's time to really open it up. Yeah baby, I'm talking 55MPH here!!
I get to a stoplight and and make my gentle left turn and scan the road and gave the skinny peddle a tiny itsy-bitsty nudge.
Ho
Lee
****!
When I said tiny itsy-bitsty nudge I meant tiny itsy-bitsty nudge but based on the amount of time it took to exceed the posted speed limit (damn near 80mph) you'd think I put my foot through the floor. Jeebus H. Tap Dancin' Christ! This thing is a-freakin'-mazing. The available power is simply phenomenal!!
Wow! Just freakin' wow!!!
Thread Starter
On The Tree
Joined: Jun 2009
Posts: 194
Likes: 0
From: colorado Springs
Thanks.
Still have a nasty sqeal coming from the front end and a video would be unbearable at this point. So far I've replaced the front bearing in the alternator, replaced the idler pully, pulled the tensioner pulley and cleaned/repacked the bearing in it, checked for proper belt and pulley alignment...still squeals like a fat chick on Free Donut Day at Krispy Kreme.
Frustrating
Still have a nasty sqeal coming from the front end and a video would be unbearable at this point. So far I've replaced the front bearing in the alternator, replaced the idler pully, pulled the tensioner pulley and cleaned/repacked the bearing in it, checked for proper belt and pulley alignment...still squeals like a fat chick on Free Donut Day at Krispy Kreme.
Frustrating
Congrats... I'm getting mine ready for state inspection. Just tooling around the neighborhood, short shifting and giving it very little go peddle... I know I'm in for a wild ride when I get the ***** to go WOT.
~2800lbs 2wd '89 toyota pickup.
~2800lbs 2wd '89 toyota pickup.