4.0 idle problems - JeepForum.com
 
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post #1 of 11 Old 08-10-2008, 04:39 PM Thread Starter
pain
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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?

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post #2 of 11 Old 08-10-2008, 06:41 PM
93jeepyj
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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
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post #3 of 11 Old 08-11-2008, 06:21 AM Thread Starter
pain
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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.
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post #4 of 11 Old 08-11-2008, 10:20 AM Thread Starter
pain
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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.
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post #5 of 11 Old 08-11-2008, 11:06 AM
Tomb Raider
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Vacuum hoses will give you the same problems. Checkem for wear and cracking.
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post #6 of 11 Old 08-11-2008, 11:49 AM
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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
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post #7 of 11 Old 08-11-2008, 01:26 PM Thread Starter
pain
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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.
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post #8 of 11 Old 08-11-2008, 01:27 PM Thread Starter
pain
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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.
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post #9 of 11 Old 08-11-2008, 07:36 PM Thread Starter
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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?
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post #10 of 11 Old 08-12-2008, 08:19 PM Thread Starter
pain
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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
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post #11 of 11 Old 08-13-2008, 06:18 PM
93jeepyj
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wow I'm suprised that didnt trip a code , glad you got it running again tho
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