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Unread 01-25-2014, 10:15 PM   #16
Firefyter-Emt
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1995 YJ Wrangler 
 
Join Date: Aug 2005
Location: Northeast CT
Posts: 593
Yea, that's not right... I have the same set uo, but with some smaller 30's on mine for now. I can pretty much hold 70 on the highway in 5th with the same exact set up... I even hit 85 once (once!) But she's a bit slow, but I am fine with that really... she's not a race car! However, I have no problems keeping up with cars driving around me.

For what it's worth, I am also running a 4.0L TB and a 2.5" PaceSeter cat back exhaust. Those two mods did help quite a bit with the highway end of things.

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Unread 01-25-2014, 11:41 PM   #17
Richard_
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1995 YJ Wrangler 
 
Join Date: Sep 2013
Location: Dallas, OR
Posts: 431
mine has 30x9.5's and has no problem holding speed as well , it takes a bit to get there , but as long as the road is flat and no headwind , all is good
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Unread 01-26-2014, 11:40 AM   #18
Firemandan
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1979 CJ7 
 
Join Date: Nov 2010
Location: McCalla, Alabama
Posts: 182
Que, ran the codes and it's showing,
12
33
17
55 end of codes
fuel pressure with key on was @35ish PSI
motor running was 40PSI
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[FONT="Impact"][SIZE="4"][COLOR="Black"]195? M38
1979 CJ7
1995 YJ [/COLOR][/SIZE][/FONT]
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Unread 01-26-2014, 01:35 PM   #19
Que89YJ
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1989 YJ Wrangler 
 
Join Date: Apr 2008
Location: Detroit, Michigan
Posts: 15,678
Both will effect your power. Running too cool is the fault code. The temp sensor and tstat should both be replaced. The fuel pressure at 40 running. Was that with the vacuum line disconnected? Did you check to see if you held pressure above 20 psi for longer then 20 minutes when shutting it off?
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Unread 01-26-2014, 01:54 PM   #20
Firemandan
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1979 CJ7 
 
Join Date: Nov 2010
Location: McCalla, Alabama
Posts: 182
I checked after more than 20 minutes and it only dropped 10PSI, it was at 30PSI when I checked.
Didn't pull the vacuum line while it was running, I can go and do it again
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[FONT="Impact"][SIZE="4"][COLOR="Black"]195? M38
1979 CJ7
1995 YJ [/COLOR][/SIZE][/FONT]
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Unread 01-26-2014, 03:32 PM   #21
Firemandan
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1979 CJ7 
 
Join Date: Nov 2010
Location: McCalla, Alabama
Posts: 182
I swapped out both the tstat and the temp. sensor last week. I was gonna drive it to get the tag and it ran hot about a half mile from home, let it cool down and I drove it home and swapped out the TStat and the temp sensor because it was showing it was still hot on the gauge. I put the new sensor in and now it doesn't move from cold temp reading. I didn't reset the codes by removing the battery cable, I'm going to do that right now and re read the codes and see what happens
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[FONT="Impact"][SIZE="4"][COLOR="Black"]195? M38
1979 CJ7
1995 YJ [/COLOR][/SIZE][/FONT]
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Unread 01-26-2014, 03:39 PM   #22
Firemandan
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1979 CJ7 
 
Join Date: Nov 2010
Location: McCalla, Alabama
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ok, ran the codes again
12
33.

34 PSI with key on and not running
40 PSI running and what looks like 42PSI with the vacuum line off the fuel regulator.
also noticed that @ 3000RPMs the motor sputters and spits, she acts like she doesn't wanna go any higher.
Injectors????
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[FONT="Impact"][SIZE="4"][COLOR="Black"]195? M38
1979 CJ7
1995 YJ [/COLOR][/SIZE][/FONT]
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Unread 01-26-2014, 03:46 PM   #23
Que89YJ
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1989 YJ Wrangler 
 
Join Date: Apr 2008
Location: Detroit, Michigan
Posts: 15,678
Wrong temp sensor the one you want to replace its the one near the tstat. Your fuel pressure is high too. If the guage is correct. Since you are 10 psi high check to make sure you have good vacuum on the line going to the regulator.
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Unread 01-26-2014, 03:47 PM   #24
Firemandan
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1979 CJ7 
 
Join Date: Nov 2010
Location: McCalla, Alabama
Posts: 182
after shut off pressure held @ 28PSI little over 20 minutes
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[FONT="Impact"][SIZE="4"][COLOR="Black"]195? M38
1979 CJ7
1995 YJ [/COLOR][/SIZE][/FONT]
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Unread 01-26-2014, 04:28 PM   #25
Que89YJ
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1989 YJ Wrangler 
 
Join Date: Apr 2008
Location: Detroit, Michigan
Posts: 15,678
Fuel pressure it's definitely wrong. Check the vacuum line at the pressure regulator. Did the pressure change when you disconnected it?
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Unread 01-26-2014, 05:21 PM   #26
Firemandan
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1979 CJ7 
 
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Location: McCalla, Alabama
Posts: 182
When I took the vacuum line off it didn't change.
The L shaped boot that connects the regulator with the vacuum line is dry rotted.
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[FONT="Impact"][SIZE="4"][COLOR="Black"]195? M38
1979 CJ7
1995 YJ [/COLOR][/SIZE][/FONT]
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Unread 01-26-2014, 05:35 PM   #27
Jeepsr4me
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fix the vacuum line... And recheck pressure
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Unread 01-26-2014, 06:14 PM   #28
Firemandan
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1979 CJ7 
 
Join Date: Nov 2010
Location: McCalla, Alabama
Posts: 182
Fixed vacuum line

Key on, not running 35psi
Running. 36psi
Running without vacuum line 42psi
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[FONT="Impact"][SIZE="4"][COLOR="Black"]195? M38
1979 CJ7
1995 YJ [/COLOR][/SIZE][/FONT]
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Unread 01-27-2014, 10:27 AM   #29
Firemandan
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1979 CJ7 
 
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Location: McCalla, Alabama
Posts: 182
I drive it around the neighborhood and still the same thing, kind of like its hitting a rev limiter at 3000rpms , spits and sputters. I'm gonna go and get a new tstat, engine coolant temp sensor and the other temp sending unit. Anything else?
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[FONT="Impact"][SIZE="4"][COLOR="Black"]195? M38
1979 CJ7
1995 YJ [/COLOR][/SIZE][/FONT]
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Unread 01-27-2014, 11:40 AM   #30
Firefyter-Emt
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1995 YJ Wrangler 
 
Join Date: Aug 2005
Location: Northeast CT
Posts: 593
What about the simple stuff? Plugs, wires, cap & rotor...
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