Any tips for adjusting the TPS on a 1990 Laredo w/ Renix?
08-06-2009, 05:56 PM
#1
Seasoned Member
Thread Starter
Join Date: Jan 2009
Location: Middle Tennessee
Posts: 454
Likes: 0
Received 0 Likes
on
0 Posts
Year: 2001
Model: Cherokee
Engine: 4.0L I6
Any tips for adjusting the TPS on a 1990 Laredo w/ Renix?
When I did my tune-up recently, which was a piece of cake thanks to the Jeep being self-adjusting with the timing, the only thing that wasn't great is the current idle speed, which hovers around 250-300rpm, often feeling like it's studdering and wanting to die, even though it never has.
I was told when I asked that I needed to clean or adjust the TPS. I have zero idea how to do this...
Where do I find out about adjusting it? Any tips? Is it easier, since I have 230k on the engine, to simply buy a new one and install it?
Any help is greatly appreciated, thanks so much
KK
I was told when I asked that I needed to clean or adjust the TPS. I have zero idea how to do this...
Where do I find out about adjusting it? Any tips? Is it easier, since I have 230k on the engine, to simply buy a new one and install it?
Any help is greatly appreciated, thanks so much
KK
08-06-2009, 06:34 PM
#2
CF Veteran
Join Date: Mar 2009
Location: Tenn. and Mich.
Posts: 28,068
Likes: 0
Received 6 Likes
on
6 Posts
Year: 2004
Model: Grand Cherokee
Engine: 4.7L V8
It tells how to adjust the TPS, and other things, in here. Jeep Cherokee Engines - RENIX (non-HO) Engine Sensor Diagnostics
08-11-2009, 01:18 PM
#4
Seasoned Member
Thread Starter
Join Date: Jan 2009
Location: Middle Tennessee
Posts: 454
Likes: 0
Received 0 Likes
on
0 Posts
Year: 2001
Model: Cherokee
Engine: 4.0L I6
ugh, I lost this post and forgot to reply...
First off... thank you Blue. I'm clicking on that link as I type
And um, regarding the TB... no, didn't clean it. Have no idea how to, actually... is that something I need to do?
First off... thank you Blue. I'm clicking on that link as I type
And um, regarding the TB... no, didn't clean it. Have no idea how to, actually... is that something I need to do?
08-12-2009, 07:25 AM
#5
CF Veteran
Join Date: Jun 2009
Posts: 5,383
Likes: 0
Received 4 Likes
on
1 Post
Year: 1988 limited
Model: Cherokee
Engine: 4.0 litre
If your TB has grime around the throttle, it will idle roughly and low, due to air flow reduction.
Check your vacuum supply to the map sensor too.
Check your vacuum supply to the map sensor too.
08-12-2009, 05:33 PM
#7
Seasoned Member
Join Date: Feb 2009
Location: Glenwood Springs, CO
Posts: 371
Likes: 0
Received 0 Likes
on
0 Posts
Year: 2000 - Murdered out
Model: Cherokee
Engine: 4.0 I6
I had similar issue. I replaced both o2 sensors, still rough. Replaced TPS, still rough. Removed and cleaned throttle body, IAC sensor and valve, works so far.
Its not too hard, just time consuming. Get some throttle body cleaner from the parts store. Disconnect your battery, unplug all of your sensors to the TB, remove your air tube, then remove the 4 bolts holding the TB. They are 10mm. Remove the IAC sensor and valve. Spray the cleaner on said parts, wipe and clean thoroughly with cloth and Qtips. Reattach everything you took apart and you're good.
If you search on jeepforum.com, there are a couple write ups if you like pictures. Hope it helps.
Its not too hard, just time consuming. Get some throttle body cleaner from the parts store. Disconnect your battery, unplug all of your sensors to the TB, remove your air tube, then remove the 4 bolts holding the TB. They are 10mm. Remove the IAC sensor and valve. Spray the cleaner on said parts, wipe and clean thoroughly with cloth and Qtips. Reattach everything you took apart and you're good.
If you search on jeepforum.com, there are a couple write ups if you like pictures. Hope it helps.
Trending Topics
08-13-2009, 11:17 AM
#8
Seasoned Member
Thread Starter
Join Date: Jan 2009
Location: Middle Tennessee
Posts: 454
Likes: 0
Received 0 Likes
on
0 Posts
Year: 2001
Model: Cherokee
Engine: 4.0L I6
I had similar issue. I replaced both o2 sensors, still rough. Replaced TPS, still rough. Removed and cleaned throttle body, IAC sensor and valve, works so far.
Its not too hard, just time consuming. Get some throttle body cleaner from the parts store. Disconnect your battery, unplug all of your sensors to the TB, remove your air tube, then remove the 4 bolts holding the TB. They are 10mm. Remove the IAC sensor and valve. Spray the cleaner on said parts, wipe and clean thoroughly with cloth and Qtips. Reattach everything you took apart and you're good.
If you search on jeepforum.com, there are a couple write ups if you like pictures. Hope it helps.
Its not too hard, just time consuming. Get some throttle body cleaner from the parts store. Disconnect your battery, unplug all of your sensors to the TB, remove your air tube, then remove the 4 bolts holding the TB. They are 10mm. Remove the IAC sensor and valve. Spray the cleaner on said parts, wipe and clean thoroughly with cloth and Qtips. Reattach everything you took apart and you're good.
If you search on jeepforum.com, there are a couple write ups if you like pictures. Hope it helps.
That was awesome, thanks so much!
08-13-2009, 03:29 PM
#9
Seasoned Member
Join Date: Feb 2009
Location: Glenwood Springs, CO
Posts: 371
Likes: 0
Received 0 Likes
on
0 Posts
Year: 2000 - Murdered out
Model: Cherokee
Engine: 4.0 I6
I thought so goo but didn't work for me. It was good at first, but I may need replace my IAC with a new one. This is so frustrating
08-14-2009, 05:08 PM
#10
Seasoned Member
Thread Starter
Join Date: Jan 2009
Location: Middle Tennessee
Posts: 454
Likes: 0
Received 0 Likes
on
0 Posts
Year: 2001
Model: Cherokee
Engine: 4.0L I6
Is replacing them the simplest way? They're just wires with harnesses on them, yes? well, not the TB, but the TPS and IAC sensors? Ugh, this is a realm I know very little about... forgive me if I asked the question wrong or made incorrect assumptions
08-14-2009, 05:18 PM
#11
CF Veteran
Join Date: Jul 2009
Location: Chico,ca
Posts: 2,158
Likes: 0
Received 10 Likes
on
9 Posts
Year: 89
Model: Cherokee
Engine: 4.0
it is simple,just unplug and remove them from the throttle body and replace with correct ones. Be careful to get tps back where it was,make sure to reinstall o-ring on iac and that old one is out,and do not overtighten,the throttle body screws strip very easy.
08-30-2009, 03:09 PM
#12
Seasoned Member
Thread Starter
Join Date: Jan 2009
Location: Middle Tennessee
Posts: 454
Likes: 0
Received 0 Likes
on
0 Posts
Year: 2001
Model: Cherokee
Engine: 4.0L I6
So I did this yesterday... at least, I tried to.
Maybe y'all can help?
I removed the IAC, cleaned it with TB cleaner, no problem. Can't get my air tube off of the throttle body though... someone before me stripped the screws, nothing catches so I can't unscrew it to get to the throttle body!
What do I do? I don't want to drill it out (dont' know how to, really) and I really need to fix this idle problem... do y'all have any suggestions for getting that dumb air tube off of the TB so I can pull it and clean it? =\
Cleaning the IAC didn't help my idle at all, either =(
Maybe y'all can help?
I removed the IAC, cleaned it with TB cleaner, no problem. Can't get my air tube off of the throttle body though... someone before me stripped the screws, nothing catches so I can't unscrew it to get to the throttle body!
What do I do? I don't want to drill it out (dont' know how to, really) and I really need to fix this idle problem... do y'all have any suggestions for getting that dumb air tube off of the TB so I can pull it and clean it? =\
Cleaning the IAC didn't help my idle at all, either =(
08-30-2009, 03:34 PM
#13
Seasoned Member
Join Date: Aug 2009
Posts: 300
Likes: 0
Received 0 Likes
on
0 Posts
Year: 88 limited
Model: Cherokee
Engine: 4.0
Try gripping the heads of the srews that hold the air tube with vise-grips,or there are srew removers.just cleaning th tb bumpt my idle from 650 to about 2200
08-31-2009, 06:20 PM
#14
Seasoned Member
Join Date: Feb 2009
Location: Glenwood Springs, CO
Posts: 371
Likes: 0
Received 0 Likes
on
0 Posts
Year: 2000 - Murdered out
Model: Cherokee
Engine: 4.0 I6
Kodiak, do you still have the low idle problem? I finally fixed mine. This is what happened...I stripped the o2 sensor wires with my driveshaft while wheelin. Driving through mud and water shorted a fuse under the hood. This caused the o2 sensor to send a high voltage code.
My fix was simply replacing the 20 amp fuse under the hood. Since I did that, no problems. Not sure if its the same thing you're dealing with, but I ended up changing both o2 sensors, IAC, MAP and TPS. If I just checked the fuse first, I could've saved a lot of cash!
My fix was simply replacing the 20 amp fuse under the hood. Since I did that, no problems. Not sure if its the same thing you're dealing with, but I ended up changing both o2 sensors, IAC, MAP and TPS. If I just checked the fuse first, I could've saved a lot of cash!
11-03-2009, 11:51 AM
#15
Seasoned Member
Thread Starter
Join Date: Jan 2009
Location: Middle Tennessee
Posts: 454
Likes: 0
Received 0 Likes
on
0 Posts
Year: 2001
Model: Cherokee
Engine: 4.0L I6
Kodiak, do you still have the low idle problem? I finally fixed mine. This is what happened...I stripped the o2 sensor wires with my driveshaft while wheelin. Driving through mud and water shorted a fuse under the hood. This caused the o2 sensor to send a high voltage code.
My fix was simply replacing the 20 amp fuse under the hood. Since I did that, no problems. Not sure if its the same thing you're dealing with, but I ended up changing both o2 sensors, IAC, MAP and TPS. If I just checked the fuse first, I could've saved a lot of cash!
My fix was simply replacing the 20 amp fuse under the hood. Since I did that, no problems. Not sure if its the same thing you're dealing with, but I ended up changing both o2 sensors, IAC, MAP and TPS. If I just checked the fuse first, I could've saved a lot of cash!