Under powered 95 yj with a 2.5L - Page 3 - JeepForum.com

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post #31 of 116 Old 01-27-2014, 10:51 AM Thread Starter
Firemandan
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1979 CJ7 
 
Join Date: Nov 2010
Location: McCalla
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I replaced those big gap platinum plugs with standard champion copper plugs.
about to go and get a new tstat, ecs and temp sensor.
Plug wires are new livewire wires, coil is a screaming demon and new cap and rotor


195? M38
1979 CJ7
1995 YJ
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post #32 of 116 Old 01-27-2014, 11:17 AM
Que89YJ
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1989 YJ Wrangler 
 
Join Date: Apr 2008
Location: Detroit
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Recheck your pressure with the vacuum line connected and disconnected. You should see the 10 psi increase with the line disconnected. The temp issue will cause it to stay in open loop and cause some power issues too. You want the temp sensor at the tstat housing. If your guage is not working it is the single wire sensor on the rear of the head near the firewall. Make sure you bleed the air from the system any time you open it up. Get the tstat with a bleed hole built into it or put one in yourself by drilling a tiny hole in it. Make sure you always disconnect the battery for a 10 count when you play with sensors to clear any stored codes.
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post #33 of 116 Old 01-27-2014, 11:29 AM Thread Starter
Firemandan
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I'm about to go to the store now, I'll update when I get it done. shouldn't take long

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1995 YJ
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post #34 of 116 Old 01-27-2014, 03:20 PM Thread Starter
Firemandan
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ok, replaced the coolant temp sensor, temp sensor and the tstat
rechecked the fuel pressure and it was
35PSI with key on
36PSI running with vacuum on
42PSI with vacuum off
36PSI after 20 minutes shut off
good news is that temp gauge is working now.
pulled the codes and got 12 and 33

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1979 CJ7
1995 YJ
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post #35 of 116 Old 01-27-2014, 03:56 PM
Que89YJ
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1989 YJ Wrangler 
 
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The fuel pressure is high and there's not enough difference with the house disconnected. If the guage it's good then you have a bad regulator. The difference is very small though. The vacuum on the line to the regulator lowers the pressure. Are you sure you have a good vacuum on the line?
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post #36 of 116 Old 01-27-2014, 03:57 PM Thread Starter
Firemandan
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and it still acts funky at 3000RPMs. That's sitting still not in gear, not under any load.

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1995 YJ
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post #37 of 116 Old 01-27-2014, 03:59 PM Thread Starter
Firemandan
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Que, I'm gonna go and check it again with some help from my wife. be right back.

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1995 YJ
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post #38 of 116 Old 01-27-2014, 04:01 PM
Que89YJ
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1989 YJ Wrangler 
 
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I think you have a bad intake air temp sensor. Look at the factory manual here for the numbers.
http://www.jeep4x4center.com/knowledge-base/index.htm
Can't post the pics from the cell.
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post #39 of 116 Old 01-27-2014, 04:04 PM
bedwards24676
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Quote:
Originally Posted by Firemandan
and it still acts funky at 3000RPMs. That's sitting still not in gear, not under any load.
Man it's sounds like your jeep is acting just like mine. I've been following this thread and it's so similar to what I'm dealing with. Hope you get it worked out.
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post #40 of 116 Old 01-27-2014, 04:26 PM Thread Starter
Firemandan
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Que, with key on its showing 35 psi
Running its showing 47psi but the needle on the gauge was bouncing a lot but 47 was the highest. With the vacuum line off it showed 41 psi without any bounce and I just shut it off and waiting 20 minutes.

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1995 YJ
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post #41 of 116 Old 01-27-2014, 04:37 PM Thread Starter
Firemandan
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After 20 minutes, no leak down of pressure, sitting at 37psi

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1995 YJ
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post #42 of 116 Old 01-27-2014, 04:49 PM
Que89YJ
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1989 YJ Wrangler 
 
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I am getting the threads confused on my cell. That is way too high. You need to disconnect the return line off the fuel rail and run a house from the fuel rail to a gas can or something to catch the fuel. Hook up the pressure guage and quickly start and check the pressure and then shut it off. If the pressure drops to normal then you have an issue with the return line or the pump. If it's still high then the regulator is bad.
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post #43 of 116 Old 01-27-2014, 04:50 PM Thread Starter
Firemandan
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after 30 minutes it dropped down to 30PSI

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1995 YJ
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post #44 of 116 Old 01-27-2014, 05:00 PM
Que89YJ
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Run the test like I described. You have narrowed it down. You definitely have a fuel issue.
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post #45 of 116 Old 01-27-2014, 05:44 PM Thread Starter
Firemandan
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Location: McCalla
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Just did that check, with the return line off and a hose hooked to the fuel rail. When it started it was fluctuating from low 30's to high 40's

195? M38
1979 CJ7
1995 YJ
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