Maintenance questions
#1
Member
Thread Starter
Join Date: Mar 2020
Location: Wyoming
Posts: 103
Likes: 0
Received 3 Likes
on
3 Posts
Year: 2000
Model: Cherokee (XJ)
Engine: 4.0
Maintenance questions
My jeep is my daily has 220000 miles and still runs pretty good but it is starting to get a little sluggish at times. I want to get it running good this winter since I'll have some free time. Other then general maintenance what are some things I could check into or replace to make her running nice and smooth?
#2
CF Veteran
Join Date: Aug 2020
Location: SoCal
Posts: 1,765
Received 470 Likes
on
384 Posts
Year: 1988
Model: Cherokee (XJ)
Engine: 4.0L
Define "sluggish"?
By "general maintenance" I assume you mean oil/filter change, air filter, check other fluids (trans, brake), check belt tension. I would pull and check plugs (change if needed). While the plugs are out, check compression. Run some fuel/injector cleaner. Remove and check cap and rotor (clean/change if needed). Check plug wires and connectors (change if needed). Clean your throttle body. Look for any oil leaks, coolant leaks and correct as needed. Check and adjust tire pressures as needed.
Even if your CEL is off, connect a scanner and look for any pending codes.
By "general maintenance" I assume you mean oil/filter change, air filter, check other fluids (trans, brake), check belt tension. I would pull and check plugs (change if needed). While the plugs are out, check compression. Run some fuel/injector cleaner. Remove and check cap and rotor (clean/change if needed). Check plug wires and connectors (change if needed). Clean your throttle body. Look for any oil leaks, coolant leaks and correct as needed. Check and adjust tire pressures as needed.
Even if your CEL is off, connect a scanner and look for any pending codes.
#3
CF Veteran
My jeep is my daily has 220000 miles and still runs pretty good but it is starting to get a little sluggish at times. I want to get it running good this winter since I'll have some free time. Other then general maintenance what are some things I could check into or replace to make her running nice and smooth?
I had an intermittant miss once, it was a cracked spark plug ceramic, in the dark you could see the spark from it going to the head!
make sure you sensors are good, for instance the temperature sensor, the manifold pressure sensor etc.. make sure all the vacuum fittings and hose are leak tite.
you can do an engine vacuum test, quick and easy, just buy a vacuum gage and hook it with a tee to one of the vacuum hoses, that can tell you a lot.
of course a compression or leak down test can also tell you if mechanically things are good or not.
Id consider the vacuum test after checking the basic tune up stuff.
remember O2 sensors are are comsumable, 30k to 60 k mikes is typical life of them.
An engine analyzer can help. I got a snap on analyzer, it helped me find some issues, if you got a fancy obd late model then there are other brands of anaylzers, but I got a pre obd 1990 jeep.
#6
Seasoned Member
Join Date: Jul 2019
Location: North Carolina
Posts: 417
Received 96 Likes
on
73 Posts
Year: 1996
Model: Cherokee (XJ)
Engine: 4.0 I6
.
4 hole, 12 hole, 36 hole, 100 hole, etc... injectors aren't an upgrade unless your injectors are currently shot. But if your injectors are currently shot, any new or reman injectors including stock 1 hole would be an upgrade.
There's been dyno reports on here and the "performance" difference is negligible at best.
There's been dyno reports on here and the "performance" difference is negligible at best.
The following users liked this post:
agreen (11-08-2022)
#7
Senior Member
Join Date: Sep 2014
Location: Ohio
Posts: 554
Likes: 0
Received 7 Likes
on
7 Posts
Year: 2000
Model: Cherokee (XJ)
Engine: 4.0L
Originally Posted by vroomvroom
4 hole, 12 hole, 36 hole, 100 hole, etc... injectors aren't an upgrade unless your injectors are currently shot. But if your injectors are currently shot, any new or reman injectors including stock 1 hole would be an upgrade.
There's been dyno reports on here and the "performance" difference is negligible at best.
There's been dyno reports on here and the "performance" difference is negligible at best.
Trending Topics
#8
CF Veteran
Convinced by the youtubes showing an impressive atomisation of the multihole injectors vs the single injector 'stream', I did the swap. Negligible difference, not even on fuel economy, against all logic. Just my n=1 experience..
The following users liked this post:
tjwalker (12-02-2022)
#9
Seasoned Member
#10
CF Veteran
The Jeep engine is port injected and the combustion chamber features a swirl inducing ridge on the plug side. This ridge will atomize fuel even if you blast it in with a fire hose. Multi-hole injectors were introduced to atomize fuel in OHC engines where inducing swirl is impossible. They are also required for 4 valve chambers where the injector is positioned directly in the center of the chamber. AFR being the same, Injector flow rate being the same, there will be zero difference in performance between a Jeep engine with OE injectors v the Chinese 4 or 12 hole injectors.
#11
After I get the car parts sorted out, I usually take the time to tune the car. First the interior, then the exterior. I was recently given a car to pimp it out. First I took care of all the internal parts. Then I started to tune the inside and put in mercedes benz car mats and other stuff like that. So I think at your stage tuning might work.
Last edited by mskam355; 11-29-2022 at 10:31 AM.
#12
#13
::CF Moderator::
Join Date: Aug 2011
Location: Prescott, Az
Posts: 43,971
Received 1,559 Likes
on
1,263 Posts
Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
4 hole, 12 hole, 36 hole, 100 hole, etc... injectors aren't an upgrade unless your injectors are currently shot. But if your injectors are currently shot, any new or reman injectors including stock 1 hole would be an upgrade.
There's been dyno reports on here and the "performance" difference is negligible at best.
There's been dyno reports on here and the "performance" difference is negligible at best.
There are many horrible "new" injectors out of china.
Best to get reman injectors from Trevor here on CF. They come with the flow chart!!
trevor.skankfootracing@gmail.com
#14
Seasoned Member
Join Date: Jul 2019
Location: North Carolina
Posts: 417
Received 96 Likes
on
73 Posts
Year: 1996
Model: Cherokee (XJ)
Engine: 4.0 I6
.
Beware!!
There are many horrible "new" injectors out of china.
Best to get reman injectors from Trevor here on CF. They come with the flow chart!!
trevor.skankfootracing@gmail.com
There are many horrible "new" injectors out of china.
Best to get reman injectors from Trevor here on CF. They come with the flow chart!!
trevor.skankfootracing@gmail.com