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  #6261  
Old May 20th, 2016, 06:27 PM
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Dad and I are discussing, and think the ECU is telling the injectors to dump too much fuel in the left bank of cylinders? Bad O2 sensor?
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  #6262  
Old May 20th, 2016, 06:34 PM
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Ed
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If all those plugs started off new, I'd be suspicious of the ones that look too clean, not the ones that look too dirty?
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  #6263  
Old May 20th, 2016, 06:42 PM
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Quote:
Originally Posted by sonoronos View Post
If all those plugs started off new, I'd be suspicious of the ones that look too clean, not the ones that look too dirty?
These plugs have one trip to the gas station, and one trip to Kilroys on them. Maybe 25 miles total.
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  #6264  
Old May 20th, 2016, 07:37 PM
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If I had to guess, I would guess that the ECU is wired to the injectors backwards. That is, the left side is injecting when the right side should be.
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  #6265  
Old May 20th, 2016, 09:22 PM
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Quote:
Originally Posted by o2batsea View Post
If I had to guess, I would guess that the ECU is wired to the injectors backwards. That is, the left side is injecting when the right side should be.
I don't understand how it could be backwards, or how swapping anything will fix it.
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  #6266  
Old May 20th, 2016, 09:31 PM
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My eyes may be old, but it looks as if your #2 never even fired. As Ed mentioned, I'd be more suspect about the clean ones. Are the sparking?


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  #6267  
Old May 21st, 2016, 08:28 AM
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I'll check for spark this morning, but it would baffle me to think the truck runs as well as it does if only 4 of the cylinders are firing.
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  #6268  
Old May 21st, 2016, 09:21 AM
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Loic Fabro
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If you suspect a sensor problem, pull the maf connector and try to run your engine (this will bring up the check engine light; it's ok). This will force the ECU into limp-mode which make it ignore all (?) sensor input and will allow you to focus your attention to non-ECU-based theories (I.e. Back to basics).
I don't know what yo'all tried so far, so I will not provide any more theories [but would be tempted to verify that the amplifier has the relocation kit, swap a coil, rotor head, swap ignition wires and verify (at night, very easy) that there is no arcing when the engine runs.

P.s.: you might get more help (or more theories? ) having your own troubleshooting thread than this one!
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  #6269  
Old May 21st, 2016, 09:32 AM
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Bill may be on to something. Are the clean plugs even wet with fuel? They won't be clean if there is fuel and they are firing.

Have you done a compression check on this engine? Also you can put a stethoscope (or long screwdriver) to listen to injectors and see if they are operating.

The dirty plugs don't look that bad, hard to tell from the photo.

DOes this truck have a working CEL?


Quote:
Originally Posted by MonLand View Post
If you suspect a sensor problem, pull the maf connector and try to run your engine (this will bring up the check engine light; it's ok). This will force the ECU into limp-mode which make it ignore all (?) sensor input and will allow you to focus your attention to non-ECU-based theories (I.e. Back to basics).
I don't know what yo'all tried so far, so I will not provide any more theories [but would be tempted to verify that the amplifier has the relocation kit, swap a coil, rotor head, swap ignition wires and verify (at night, very easy) that there is no arcing when the engine runs.

P.s.: you might get more help (or more theories? ) having your own troubleshooting thread than this one!
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Present:
1960 SII 109"- "Red Square"
1984 90 Tdi- "Yamelo"
1988 RRC- "Chewbacca"
1987 RRC- "Chewy 2"
2008 RRS SC- "The Supersofa"

Past:
1959 SII 88"- "The Little Green Beastie" last seen in NY
1972 SIII 88"- "GreenHELL" now in NC
1988 90 "Eric the Half a Bee" half a truck, sold for parts
1991 RRC- never got a name- long since recycled
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  #6270  
Old May 21st, 2016, 09:36 AM
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I have good spark everywhere. It makes no sense why one side of the engine has caked black plugs, and the others are clean. The clean ones aren't "new" clean. You can tell they've been firing. The only logical fault would be the O2 sensor on the black plug side being bad. The injectors are being told to dump more fuel on those 4 cylinders. Faults in any other sensors/components wouldn't explain the massive difference in the plugs from one side of the engine to the other. I know I'm a novice, but I can't make sense of it any other way.

------ Follow up post added May 21st, 2016 09:39 AM ------

I have no dash yet, so no lights. I don't have the tools for a compression test.

There is no way this engine runs this smooth still, or at all, with half of the cylinders not firing. Am I crazy for thinking that?
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  #6271  
Old May 21st, 2016, 09:41 AM
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Swap o2 sensors then and check the plugs after a ride. I plan to put my o2 sensors on an oscilloscope soon, maybe tomorrow. Keep getting a 44 code myself.

I will look to see if I have a code reader. I had one with a broken tab but might have gotten rid of it. We should also get you a cel, and see what rover gauge says.
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  #6272  
Old May 21st, 2016, 10:07 AM
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Quote:
Originally Posted by cgalpin View Post
Swap o2 sensors then and check the plugs after a ride. I plan to put my o2 sensors on an oscilloscope soon, maybe tomorrow. Keep getting a 44 code myself.

I will look to see if I have a code reader. I had one with a broken tab but might have gotten rid of it. We should also get you a cel, and see what rover gauge says.
Swapped O2 sensors. They mimicked their dirty/clean side spark plugs respectively in terms of blackness. Engine runs the same, and truck drives the same. I am letting it run for a while, then will pull a clean side plug to see how dirty it got.
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  #6273  
Old May 21st, 2016, 10:11 AM
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Quote:
Originally Posted by 85Red110 View Post
Dad and I are discussing, and think the ECU is telling the injectors to dump too much fuel in the left bank of cylinders? Bad O2 sensor?
Easy way to confirm rich bank. Assuming you are running CATs, measure the temp of each CAT with a IR temp gun. One CAT will be significantly hotter (~100F) as it is burning off the surplus hydrocarbons. It could still be spark, O2 sensor, plug wires, other.
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  #6274  
Old May 21st, 2016, 10:14 AM
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Quote:
Originally Posted by down_shift View Post
Easy way to confirm rich bank. Assuming you are running CATs, measure the temp of each CAT with a IR temp gun. One CAT will be significantly hotter (~100F) as it is burning off the surplus hydrocarbons. It could still be spark, O2 sensor, plug wires, other.
No cats. But could still check the temp at the exhaust manifolds, right?
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  #6275  
Old May 21st, 2016, 11:49 AM
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After test run, odd # plugs are still caked black, while the even # plugs are clean. Temp difference between the two sides is significant. Even # cylinders are still hot though, so they are definitely firing, but just running really clean. Something is wrong with the odd # bank, likely the injector wiring section of the harness?
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  #6276  
Old May 21st, 2016, 12:01 PM
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Quote:
Originally Posted by 85Red110 View Post
After test run, odd # plugs are still caked black, while the even # plugs are clean. Temp difference between the two sides is significant. Even # cylinders are still hot though, so they are definitely firing, but just running really clean. Something is wrong with the odd # bank, likely the injector wiring section of the harness?
try swapping ECUs with someone? Else, check that left O2 sensor.
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  #6277  
Old May 21st, 2016, 12:09 PM
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Quote:
Originally Posted by down_shift View Post
try swapping ECUs with someone? Else, check that left O2 sensor.
I switched the O2 sensors, and the results were the same.
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  #6278  
Old May 21st, 2016, 12:32 PM
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Def try a known good ECU.
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  #6279  
Old May 21st, 2016, 01:23 PM
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Is known good. O2 sensors not in play in this
It does appear that the right bank is not fueling
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  #6280  
Old May 21st, 2016, 03:08 PM
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Quote:
Originally Posted by 85Red110 View Post

I switched the O2 sensors, and the results were the same.
Lack there of or failure of speed sensor will cause the odd bank to go into Rev limiter mode, thus emulating your simptoms. This should be located as a box with wires coming out of the t case and speedometer cable.
If you have cats and you continue to drive you will kill them, if all you have is 02 sensors you're a step ahead of the game as there is no fear of damaged cats....
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