Acceleration loss, low voltage, and diagnostic codes! HELP - JeepForum.com
 
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post #1 of 6 Old 03-12-2013, 01:25 AM Thread Starter
scottieboy
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1991 YJ Wrangler 
 
Join Date: Jun 2008
Location: Chicago, IL
Posts: 116
Acceleration loss, low voltage, and diagnostic codes! HELP

Ok, so I have a 4.0L 5 speed 1991 yj.
The positive terminal has a lot of corrosion and yellow powder. The power cable that runs to the starter is duct tape (from po). I had an issue last year that my jeep wouldn't start up after I turned it off and I had to constantly adjust the battery terminal to get it started again until I finally tightened it very tight. I since have had that issue but now there's a build up of corrosion.

I had no issues except codes 12, 21, and occasionally 41 (alternator field). Nothing happened so I ignored it.
Recently, I would sometimes lose acceleration and sputter/backfire(missfire?) and would happen at any speed and any temp but soon would go away. I kept an eye on it but never really did anything.

NOW its getting serious.. my voltage reads 8-10 on top of everything else and I have code 51 showing now(lean air/fuel ratio). Aside from replacing the duct tape wire, I'm not sure where to start.

PLEASE HELP! Where do I start?? Its a beautiful rig with only 78xxx miles, I need to fix it up! I challenge anyone to help me!
Thanks in advance!
-Scott

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post #2 of 6 Old 03-12-2013, 12:08 PM Thread Starter
scottieboy
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Location: Chicago, IL
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post #3 of 6 Old 03-12-2013, 01:22 PM
jokerchief462
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1989 YJ Wrangler 
 
Join Date: Nov 2010
Location: Sin City
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Garage
Take the alternator off and have it tested. Low voltage would make most of things you are having trouble with happen.

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 #4 of 6 Old 03-12-2013, 01:27 PM
Que89YJ
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1989 YJ Wrangler 
 
Join Date: Apr 2008
Location: Detroit
Posts: 24,673
You need to clean and replace all the garbage wiring for the battery and alternator for sure. When you are done cleaning or replacing then use a coating of grease or vaseoline to stop it from happening again. That is the low voltageissue. You may have screwed up the alternator but until you clean and replace all the wiring including the grounds for the battery to the chasis there is no way to know for sure.

51 is the O2 sensor and it is one of 2 things; either the O2 sensor is bad or you are dealing with a cracked exhaust manifold or loose bolts. The manifolds crack by the collector tubes where they come together and the bolts especially towards the rear loosen up over time. Check for the crack/leak before replacing the sensor because you are seig the lean fault.
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post #5 of 6 Old 03-12-2013, 01:40 PM Thread Starter
scottieboy
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1991 YJ Wrangler 
 
Join Date: Jun 2008
Location: Chicago, IL
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Thanks guys! I'll get on that and keep this updated!
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post #6 of 6 Old 03-12-2013, 11:20 PM Thread Starter
scottieboy
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1991 YJ Wrangler 
 
Join Date: Jun 2008
Location: Chicago, IL
Posts: 116
So I know this was the lazy route but I took into firestone and told them all the issues (i want it done right the first time!). Ill find out what it is exactly tomorrow and post it, and whether or not it resolves the issue.
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acceleration loss , sputtering , voltage drop

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