4.0 idle problems - JeepForum.com
Search  
Sign Up   Today's Posts
User: Pass: Remember?
Advertise Here
Jeep Home Jeep Forum Jeep Classifieds Jeep Registry JeepSpace Jeep Reviews Jeep Gallery Jeep Clubs Jeep Groups Jeep Videos Jeep Events Jeep Articles
Go Back JeepForum.com > Models > Jeep Wrangler Forums > YJ Wrangler Technical Forum > 4.0 idle problems

Introducing MONSTALINER™ UV Permanent DIY Roll On Bed LineRockridge 4WD IS Taking Zone Offroad Suspension Lift Kits Rough Country Jeep Suspension Deals at Rockridge 4WD!

Reply
Unread 08-10-2008, 04:39 PM   #1
pain
Registered User
1995 YJ Wrangler 
 
Join Date: May 2008
Location: salem,OH
Posts: 49
4.0 idle problems

I bought a 95 yj 4.0,5 speed with a burnt engine wiring harness, I put on a new harness it fired right up, I've put probably around a thousand miles on the jeep and it's run great until the other night. I was on my way home and about half way there I noticed my rpm drop and no throttle responce then it picked up and dropped again at stops it would've probably stalled if I didn't keep my foot on the gas it did this the rest of the way home. So today I pulled the throttle body off cleaned it and the IAC, same problem. I bought a new TPS and IAC and put them on and it actually seems worse, any ideas on what else it could be?

pain is offline   Reply With Quote
Unread 08-10-2008, 06:41 PM   #2
93jeepyj
Registered User
1993 YJ Wrangler 
 
Join Date: May 2008
Location: windsor locks, CT
Posts: 2,679
Did you reset the computer after changing the tps ? I had the same issue and I changed the tps but it was still acting funny until I reset the computer, Just pull the battery cables for 30 mins or so and see if that helps
93jeepyj is offline   Reply With Quote
Unread 08-11-2008, 06:21 AM   #3
pain
Registered User
1995 YJ Wrangler 
 
Join Date: May 2008
Location: salem,OH
Posts: 49
Quote:
Originally Posted by 93jeepyj View Post
Did you reset the computer after changing the tps ? I had the same issue and I changed the tps but it was still acting funny until I reset the computer, Just pull the battery cables for 30 mins or so and see if that helps
I diddn't do that, I'll try it today.
pain is offline   Reply With Quote
Unread 08-11-2008, 10:20 AM   #4
pain
Registered User
1995 YJ Wrangler 
 
Join Date: May 2008
Location: salem,OH
Posts: 49
Quote:
Originally Posted by 93jeepyj View Post
Did you reset the computer after changing the tps ? I had the same issue and I changed the tps but it was still acting funny until I reset the computer, Just pull the battery cables for 30 mins or so and see if that helps
Well I tried disconecting the battery for a while and it's still doing the same thing, it doesn't seem as bad though. I'm going to change the feul filter tonight and see if that helps.
pain is offline   Reply With Quote
Unread 08-11-2008, 11:06 AM   #5
Helldorado Customs
Addicted...
 
Helldorado Customs's Avatar
2007 JK Wrangler 
 
Join Date: Aug 2005
Location: Jefferson City, Missouri
Posts: 4,975
Vacuum hoses will give you the same problems. Checkem for wear and cracking.
Helldorado Customs is offline   Reply With Quote
Unread 08-11-2008, 11:49 AM   #6
1995_4.5L Jeep
Registered User
 
Join Date: Dec 2007
Location: Colorado Springs
Posts: 227
CEL on? Pull the codes if so.
__________________
1995 Wrangler 4.5L
8.8 Ford rear
4.11 gears
ax-15 trans
4" lift 33" tires
1995_4.5L Jeep is offline   Reply With Quote
Unread 08-11-2008, 01:26 PM   #7
pain
Registered User
1995 YJ Wrangler 
 
Join Date: May 2008
Location: salem,OH
Posts: 49
Quote:
Originally Posted by Tomb Raider View Post
Vacuum hoses will give you the same problems. Checkem for wear and cracking.
Yea, thats my next step. When I put the new harness on I put new vac lines too so maybe something came loose.
pain is offline   Reply With Quote
Unread 08-11-2008, 01:27 PM   #8
pain
Registered User
1995 YJ Wrangler 
 
Join Date: May 2008
Location: salem,OH
Posts: 49
Quote:
Originally Posted by 1995_4.5L Jeep View Post
CEL on? Pull the codes if so.
No, the CEL hasn't come on. It couldn't be that easy.
pain is offline   Reply With Quote
Unread 08-11-2008, 07:36 PM   #9
pain
Registered User
1995 YJ Wrangler 
 
Join Date: May 2008
Location: salem,OH
Posts: 49
Well, I changed the fuel filter still stalls, checked vac lines and couldn't find any leaks(gonna double check them again tomarrow). The map sensor and O2 sensor are all thats left I think, would either of those cause it to stall out like this?
pain is offline   Reply With Quote
Unread 08-12-2008, 08:19 PM   #10
pain
Registered User
1995 YJ Wrangler 
 
Join Date: May 2008
Location: salem,OH
Posts: 49
When I got home tonight I put a new 02 sensor on and it still died, put a new map sensor on and what do ya know the last sensor to change and it stays running!
IAC-$44
TPS-$41
02 sensor-$54
map sensor-$48
Having a Jeep that runs the way it's supposed to-Freegin priceless
Hopefully it stays that way
__________________
'95 YJ 4.0L 5-speed, SOA, 1 1/2" R.E. springs, R.E. shocks,
header,Flow Master cat back,
Poison Spider rock sliders
Full width D44 front D60 rear
38" SSRs
pain is offline   Reply With Quote
Unread 08-13-2008, 06:18 PM   #11
93jeepyj
Registered User
1993 YJ Wrangler 
 
Join Date: May 2008
Location: windsor locks, CT
Posts: 2,679
wow I'm suprised that didnt trip a code , glad you got it running again tho
93jeepyj is offline   Reply With Quote
Reply
Thread Tools


Suggested Threads





Jeep, Wrangler, Cherokee, Grand Cherokee, and other models are copyrighted and trademarked to Jeep/Chrysler Corporation. JeepForum.com is not in any way associated with Jeep or the Chrysler Corp.