Loss of Power - JeepForum.com

 
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post #1 of 8 Old 03-27-2013, 10:15 AM Thread Starter
bashbro
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1989 YJ Wrangler 
 
Join Date: May 2007
Location: Annapolis
Posts: 137
Loss of Power

1989 YJ ... 2.5L, 117,xxxx miles ... Brand new fuel pump. Jeep unforutnately only gets driven every couple months. Noticed this problem the last time i had it out and again this past weekend. Jeep always starts up initially and runs well. After a few minutes of running though, the jeep loses power. You press on the gas and the RPM's increase a little than die down immediately. You cannot feather the gas at all, as it just keeps dying. Upfront i can hear a hissing type sound, also have a smell when this happens. Smells is not burning per say, but more of a strong exhaust type smell. After this happens, if i turn the key off and shut the motor down, as soon as i turn the key and run the motor again the problem is gone. I get full power again upon restarting. Anyone have any ideas where to start with this? Thanks

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post #2 of 8 Old 03-27-2013, 10:20 AM
Rproject
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1987 YJ Wrangler 
 
Join Date: Aug 2008
Location: Sandwich, IL
Posts: 2,759
An '89, so it's carburetoreted - yes? Sounds like it's out of adjustment. My '87 had a similar smell. Adjusted the Carter POS and it runs like a champ. Thing is, I have to readjust it every month or two because the idle mixture screws work their way loose. CAN'T WAIT until Uncle Sam gives me my money back so I can get the Motorcraft 2150!

1996 White ZJ
1987 Maroon YJ (sideways build)
1996 Forest Green XJ

The "sideways" build thread: http://www.jeepforum.com/forum/f22/r...hread-2164793/
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post #3 of 8 Old 03-27-2013, 12:39 PM Thread Starter
bashbro
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1989 YJ Wrangler 
 
Join Date: May 2007
Location: Annapolis
Posts: 137
No carb. It is fuel injected.
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post #4 of 8 Old 03-27-2013, 08:27 PM
jokerchief462
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1989 YJ Wrangler 
 
Join Date: Nov 2010
Location: Sin City
Posts: 2,881
Vacuum or exhaust leak. Both play he'll with O2 sensor readings back to ECU which adjusts the mixture if fuel to air. So it becomes a performance problem. Find and repair the hissing sound and see what that does. The TBI is usually really dependable.

89YJ 2.5L TBI, AX-5, NP231 SYE, Ford 8.8, Yukon Grizzly, Tom Woods Shaft, 33" BFG T/As, 4" lift, Warn VR10000s.

AF Jeep Club Tail #184
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post #5 of 8 Old 03-28-2013, 05:43 AM
Siva283
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1995 YJ Wrangler 
 
Join Date: May 2011
Location: Falling Waters
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Check your vacuum lines too. I have learned the even a pinched line can cause issues like this. So not only check for leaks but check for a pinched line also. I know I am MPFI and you are TBI but alot of the troubleshooting is the same. Particularly check the map sensor vacuum line. The TPS uses it as a reference. For example When I replaced my enfine i broke a ccv vacuum line. I capped it off temporariliy and it threw a TPS code. Once I fixed the line no more code.

1995 YJ. 2 inch BDS Spring lift. 1 inch shackle lift. 1.25 inch JKS Body Lift 33x12.5x15's. Engo 10,000 pound winch.

Quote:
Originally Posted by Magnum View Post
I gave the Jeep the required offering of $$, sweat, and blood, and everything works fine now. -- Jim
Quote:
Originally Posted by ldso View Post
. It started with a $200 axle, and a few thousand dollars later I was done :)
Quote:
Originally Posted by Luuca View Post
diagnose the real issue before you start going all Obama on it - spending mad cash you'll need for other important things.

Ask me how I know...
Quote:
Originally Posted by Overhead View Post
this is also my second set of RC springs this year. I'd rather spend the money again and get something that will last.
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post #6 of 8 Old 03-28-2013, 06:17 AM
DEERSLAYER94YJ
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1994 YJ Wrangler 
 
Join Date: Feb 2009
Location: Wappingers Falls
Posts: 385
Catalytic Converter could be clogged up, might be a reason for your power loss?

Nightcrew Member #093

DEER--- It's whats for supper!!
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post #7 of 8 Old 03-28-2013, 09:18 AM
Que89YJ
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1989 YJ Wrangler 
 
Join Date: Apr 2008
Location: Detroit
Posts: 21,932
Check your egr and egr pipe on the exhaust manifold. You are going to need to loacate the source of the noise and it is a likely canidate.
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post #8 of 8 Old 03-28-2013, 11:00 AM
Siva283
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1995 YJ Wrangler 
 
Join Date: May 2011
Location: Falling Waters
Posts: 3,750
Quote:
Originally Posted by Que89YJ View Post
Check your egr and egr pipe on the exhaust manifold. You are going to need to loacate the source of the noise and it is a likely canidate.
Thats why I was thinking vacuum lines. I had one collapse and crack that made a surprisingly loud whistling noise. I never thought about egr. I guess because I am lucky enough to not have one.

1995 YJ. 2 inch BDS Spring lift. 1 inch shackle lift. 1.25 inch JKS Body Lift 33x12.5x15's. Engo 10,000 pound winch.

Quote:
Originally Posted by Magnum View Post
I gave the Jeep the required offering of $$, sweat, and blood, and everything works fine now. -- Jim
Quote:
Originally Posted by ldso View Post
. It started with a $200 axle, and a few thousand dollars later I was done :)
Quote:
Originally Posted by Luuca View Post
diagnose the real issue before you start going all Obama on it - spending mad cash you'll need for other important things.

Ask me how I know...
Quote:
Originally Posted by Overhead View Post
this is also my second set of RC springs this year. I'd rather spend the money again and get something that will last.
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