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  #1  
Old August 21st, 2010, 10:36 AM
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Rob G
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Check engine light

Just came on. What should I check first?
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  #2  
Old August 21st, 2010, 10:50 AM
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Chris Snyder
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Check the code. There is a display unit under your passenger seat in the cubby (pretty sure that's where it is in a '95). Open the cubby up, turn the ignition on, then you should see two glowing red numbers.

You can see what's wrong here: http://www.lrfaq.org/RR/FAQ.Engines.Fault.Codes.html
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  #3  
Old August 21st, 2010, 01:18 PM
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This always makes me chuckle. ""Check Engine" like, quick pull over and see if the engine is still there!

Oxygen sensor(s)
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1966 109 5 door wagon 300Tdi "spermaceti fueled"
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  #4  
Old August 21st, 2010, 01:22 PM
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Quote:
Originally Posted by o2batsea View Post
Oxygen sensor(s)
Most of the time it's not actually O2 sensors.

Get the code and we can diagnose from there.
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  #5  
Old August 21st, 2010, 09:28 PM
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Robert Lynch
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check your connection from the air filter to the MAF (big hose) my truck was running roungh and has a code 45 (O2 sensor Right bank) - 30 seconds tighten them up and its perfect again.
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  #6  
Old August 22nd, 2010, 12:33 PM
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Rob G
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There is a box that says on board display but it doesn't have a readout and doesn't look like it can be opened call me and walk me through it 6173084889

------ Follow up post added August 22nd, 2010 12:42 PM ------

Code display is 44 something to do with lambda bank?
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  #7  
Old August 22nd, 2010, 01:05 PM
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Lambda sensors are your Oxygen Sensors.

Reset the code with this procedure:
Quote:
The "proper" way to reset codes is to disconnect the ECU, turn the ignition on until you hear the ECU relay drop out, shut the ignition off and reconnect the ECU. Resetting the code that way just erases the displayed code and leaves any others that may be in the ECU (which will display when ignition is turned back on).
See if it comes back. Maybe it was just a fluke thing (probably not), so it's worth checking. If/When it comes back, the first thing I'd check for are vacuum leaks or holes in your intake hose.

They do go bad, but usually there's a simpler solution.
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  #8  
Old August 22nd, 2010, 02:00 PM
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Chris, I hate to say I told you so....
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1966 109 5 door wagon 300Tdi "spermaceti fueled"
1994 RRC LeWiB "ruining the air behind me"
1968 2A 88

All my troubles are Rover
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  #9  
Old August 22nd, 2010, 02:02 PM
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Quote:
Originally Posted by o2batsea View Post
Chris, I hate to say I told you so....
When I said not the O2 sensors, I meant the physical O2 sensors. Not the code. Almost 80% of the check engine threads here are for either 44 or 45 codes.
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  #10  
Old August 22nd, 2010, 02:06 PM
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Rob G
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The engine is now overheating as welll, connected to the original issue or something else?
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  #11  
Old August 22nd, 2010, 02:17 PM
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Nope overheating is plumbing. The usual suspects are #1 thermostat, #2 clogged up radiator, #3 clogged up engine block.

Regarding the check engine light, one easy solution is a small piece of black electrical tape over the light. The engine will operate just fine on no oxygen sensors. That said, you might try simply unplugging and reconnecting the o2 sensors as they sometimes get a little corrosion inside the fitting and a reseat can often fix the issue. Oxygen sensors only come into play after the engine has reached operating temp. They provide feedback to the computer telling it if it is too rich or too lean. There are other sensors that provide this same information so O2 sensors are redundant.
Undo your battery overnight to allow the ECU to reset and clear the codes.
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1966 109 5 door wagon 300Tdi "spermaceti fueled"
1994 RRC LeWiB "ruining the air behind me"
1968 2A 88

All my troubles are Rover
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  #12  
Old August 22nd, 2010, 02:27 PM
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Radiator is new. What's the solution on the clogged engine
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  #13  
Old August 22nd, 2010, 02:37 PM
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Quote:
Originally Posted by o2batsea View Post
Regarding the check engine light, one easy solution is a small piece of black electrical tape over the light. The engine will operate just fine on no oxygen sensors. That said, you might try simply unplugging and reconnecting the o2 sensors as they sometimes get a little corrosion inside the fitting and a reseat can often fix the issue. Oxygen sensors only come into play after the engine has reached operating temp. They provide feedback to the computer telling it if it is too rich or too lean. There are other sensors that provide this same information so O2 sensors are redundant.
Not really. The ECU will stay in open loop without O2 sensors and a fault code in memory. It'll run badly and not have very good fuel mileage at all. I guess it depends on what "just fine" means to you. The problem really should be fixed. Especially in the 14CUX system as it's usually a simple fix. In the 14CUX system, the O2 sensors are fairly important. The ECU is fairly tolerant of issues anyway, so if there is a fault code at all, it's usually pretty far out of normal operating parameters.
Quote:
Undo your battery overnight to allow the ECU to reset and clear the codes
You really should follow the procedure outlined earlier. The ECU is capable of storing multiple fault codes. While disconnecting the battery will clear the codes, it may cover up other stored codes (the display can only show 1 at a time). It's not very hard to just disconnect the ECU for a few seconds, is it?

Not to mention you don't have to pull it overnight. Disconnecting for 10 seconds or so clears it fine. Volatile memory.
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  #14  
Old January 24th, 2011, 01:44 PM
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I'm getting the same codes. 44+45. But in my case I'm smelling some exhaust in the cabin (softtop) with a strong fuel smell at the exhaust pipe. So my guess is it's running rich. Right? If so do I need to replace sensors or could it be something else?
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  #15  
Old January 24th, 2011, 06:08 PM
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Jake K.
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You need to see what the o2's are reading before you go replacing parts. If you're that quick to replace parts you might as well take it to the Stealership.
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  #16  
Old January 24th, 2011, 07:13 PM
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What do u mean by "see what the o2's are reading"? I'm getting CEL with ODB codes 44+45
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  #17  
Old January 24th, 2011, 11:00 PM
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Try the disconnect reconnect thing, clear the codes and see what happens. That's a zero dollar fix if it works.
Most likely your HEGOS (O2 sensors) are toast and need to be renewed. Despite opposing opinion, the engine can and will operate without them. The ecu will just fall back on it's mapping and run in open loop. No biggie.
The 14CUX ECU is pretty stupid. It's batch fire, so even though it has two oxygen sensors it can't make right/left bank adjustments anyway. 16 injection events per cycle. Not firing injectors individually.
The exhaust smell is more worrisome. It means you have both an exhaust leak and a way for those gasses to enter the people area. If I had to hazard a guess I would say that you need a new exhaust system. I see in your future some under the truck time.
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1966 109 5 door wagon 300Tdi "spermaceti fueled"
1994 RRC LeWiB "ruining the air behind me"
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  #18  
Old January 25th, 2011, 09:08 AM
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Well, I just replaced the cats and muffler this year. And I brought it back to the muffler shop a few days ago to see if they could find a leak. The guy said he couldn't find anything and he was the one who pointed out a rich fuel smell at the tailpipe. His guess was that the exhaust was recirculating into the cabin from the backside of the soft top where it's not exactly well sealed. I only smell it in cabin when I'm cruising, not at a stop.
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  #19  
Old January 25th, 2011, 10:40 AM
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This could be one of many things. I would take it in for at least a troubleshooting and diagnosis.
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Bill Adams

1966 109 5 door wagon 300Tdi "spermaceti fueled"
1994 RRC LeWiB "ruining the air behind me"
1968 2A 88

All my troubles are Rover
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  #20  
Old January 25th, 2011, 11:02 AM
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Quote:
Originally Posted by tdn View Post
His guess was that the exhaust was recirculating into the cabin from the backside of the soft top where it's not exactly well sealed. I only smell it in cabin when I'm cruising, not at a stop.
Believe it or not, that's pretty "normal" with these; I guess the differences being in how strong the smell is, and how far you're willing to go to "solve" the problem.
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