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Unread 09-26-2011, 11:34 PM   #1
95GrndChrkLmtd
Registered User
1995 ZJ 
 
Join Date: Sep 2011
Location: Regina, Saskatcgewab
Posts: 1
Bought a new Jeep, few problems. Need Help!

So I bought a 1995 Jeep Grand Cherokee Limited with 180,000k. 4.0L 2 days ago for 1000$, and I did a full tune up on it (plugs/wires/cap/rotor/fuel filter/air filter/oil change) and I'm still having a few problems. My oil pressure gauge is all over the place. My temperature gauge is fine, except everytime i hit the gas it drops right down to 0, soon as I let off it goes bback up instantly. My infinity gold CD player in it is a little mixed up, I hit 1 button and sometimes it does the right function, or instead does the function of the button right below it. And also it idles at 500 RPM, but it idles fine when im driving, other than when I'm stopped at lights and stuff it idles rough. Any ideas guys? Sorry for all the questions.

I'm Riley, and I'm new to the forum.

Thanks

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Unread 09-27-2011, 04:06 PM   #2
JeepFreak1982
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1998 ZJ 
 
Join Date: May 2011
Location: Middle Island, New York
Posts: 808
New sending unit for the gauge, new stereo, temp gauge sounds like an electrical problem someplace maybe just the sensor, the idle is probably a dirty IAC maybe a failing TPS. Wouldnt hurt to replace em both. 180K and 17 years is a long time for anything.
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Unread 09-27-2011, 04:09 PM   #3
PolkaPower
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1998 ZJ 
 
Join Date: Aug 2011
Location: The Abyss, MD
Posts: 16,233
I think it's normal for the oil pressure gauge to rise and fall a bit with engine speed especially after start up it will be lower. Mine fluctuates between 35 and 50 or so.
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Unread 09-27-2011, 04:11 PM   #4
JeepFreak1982
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1998 ZJ 
 
Join Date: May 2011
Location: Middle Island, New York
Posts: 808
Yes it will fluctuate some but not from 0-30 + lbs. It should never fall to 0 unless you have a problem.
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Unread 09-27-2011, 04:51 PM   #5
TheHalfWit
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1995 ZJ 
 
Join Date: Jan 2011
Location: Alexandria, Virginia
Posts: 695
I'd say replace the oil pressure sender, and the temp gauge sender. Since its a 95 the temp gauge sender is located on the *** end of the block, under the wiring from the injectors with about 5mm of space to play with. (You get two senders with the 93-95 zj's, one is in the water outlet tube where the thermostat is, and is for the computer. The other is right in front of the firewall towards the back of the block. Removal is easy if you have a 1/4 ratchet and the right socket break off plastic bit and unscrew the copper plug, but installation is a PITA.)

Normal range for the oil sender I'd say is 40-70 when cold, then 20-45 when warm. It will climb when you hit the gas, and fall when you idle. If its all over the place replacement is a 5 minute procedure, the oil pressure sender costs about 30 from NAPA or 15 bucks from rockauto.
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If a week goes by without needing to replace something, pinch me because I must be dreaming.
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infinity gold , oil pressure , rough idle , temperature gauge

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