Dang Code 45 Check Engine Light - Defender Source
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  #1  
Old July 26th, 2012, 05:51 AM
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Dang Code 45 Check Engine Light

On a 1994 3.9, I get the usual code 45 on my CEL. I've replaced the fuel filter and plugs so far, checked all vacuum lines, and pulled apart the O2 sensor plug and cleaned it. I also ran some fuel injector cleaner in the tank.

I can reset the ECU, and drive a good distance and the truck runs great. As soon as I roll up to a stop after a highway run, the truck sputters and the CEL kicks on. I can put the truck in Park and the sputtering improves, but as soon as it goes in to drive it will sputter worse.

Short of it actually being the O2 sensor, any other things it could be.

The truck is running rich, and the plugs on the right bank were fouled.
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  #2  
Old July 26th, 2012, 05:54 AM
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Old July 26th, 2012, 07:38 AM
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Swap the o2 sensors over and see if the fouling changes side.

------ Follow up post added July 26th, 2012 07:40 AM ------

Stepper motor idle valve thing ... Top of plenum. Give it a clean.
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  #4  
Old July 26th, 2012, 07:50 AM
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Quote:
Originally Posted by leastonce View Post
Swap the o2 sensors over and see if the fouling changes side.

------ Follow up post added July 26th, 2012 07:40 AM ------

Stepper motor idle valve thing ... Top of plenum. Give it a clean.
Yep, that's my next step. I also have 2 old spare O2 sensors I am going to try.

------ Follow up post added July 26th, 2012 07:51 AM ------

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Old July 26th, 2012, 08:17 AM
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Does it sputter when cold or when hot or at all times?
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Old July 26th, 2012, 08:30 AM
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Originally Posted by o2batsea View Post
Does it sputter when cold or when hot or at all times?
Only when hot, and at random times. Only sputters when rolling to an idle.
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Old July 26th, 2012, 08:32 AM
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Do you have another engine ECU you can try?
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  #8  
Old July 26th, 2012, 08:43 AM
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New O2 sensors are cheap. Replace them.
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Old July 26th, 2012, 08:51 AM
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Originally Posted by evilfij View Post
New O2 sensors are cheap. Replace them.
At least $70 each is not cheap - maybe for a lawyer. You should address the other potential issues first....

I am going to do the 02 swap today and even put in some old spares I have first.
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Old July 26th, 2012, 09:12 AM
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What I notice most often with a bad sensor is the truck will warm up, then run rough (in most cases rich) due to erroneous readings from the sensor until it sets the fault, turns on the CEL and reverts to the baseline "safe" fuel map.

BUT the O2 sensor codes can be set for a LOT of different reasons. If you really want to eliminate the O2 sensors from doubt, replace them with new. If they don't look new they probably need replacing anyhow and $70 each is NOT expensive for an O2 sensor these days.
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Old July 26th, 2012, 09:55 AM
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how do you put a 1994 d90 in "park" =)
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  #12  
Old July 26th, 2012, 10:20 AM
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Quote:
Originally Posted by d90boy
how do you put a 1994 d90 in "park" =)
Never said it's a 90. It's an RRC.
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Old July 26th, 2012, 10:40 AM
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That code covers about 73 faults! PIA to diagnose. You can try to reset the ECU by jumping the two pins in the back after you pull the cover off. Then disconnect battery and wait a bit. Then reconnect and start her up. I did this and that code went away. For good. Never came back.
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Old July 26th, 2012, 10:44 AM
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Quote:
Originally Posted by 1971Series88
That code covers about 73 faults! PIA to diagnose. You can try to reset the ECU by jumping the two pins in the back after you pull the cover off. Then disconnect battery and wait a bit. Then reconnect and start her up. I did this and that code went away. For good. Never came back.
Already reset it a bunch of times.
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  #15  
Old July 26th, 2012, 11:35 AM
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The $140 will be saved in gas over a year or two with new O2s and the time to diag the other not so common issues has got to be worth something.

I am the cheapest bastard in the world, but even I replace them. If you want to be truly cheap, just swap them left to right and see if the problem moves. If it does, there is your answer.
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Old July 26th, 2012, 12:36 PM
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Plug in a rover gauge ... It will show what's actually going on. The ECU takes various signals to know when to go into idle mode and also to exit idle mode when you move.
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  #17  
Old July 26th, 2012, 12:43 PM
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Quote:
Originally Posted by leastonce
Plug in a rover gauge ... It will show what's actually going on. The ECU takes various signals to know when to go into idle mode and also to exit idle mode when you move.
Yeah, 99% of us don't have one of those.
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  #18  
Old July 26th, 2012, 02:56 PM
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along the same lines...can an o2 sensor be salvaged? it would seem that you could decontaminate them or something.
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Old July 26th, 2012, 03:57 PM
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Quote:
Originally Posted by Wolf Fabrication View Post
Yeah, 99% of us don't have one of those.
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Old July 26th, 2012, 05:07 PM
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I've been fouling the right bank, my truck runs rich I've changed o2 sensors. It would be nice to know what the cause is. Welcome to the joys of Rover EFI.
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