Running rough, code 27, exhaust smells like unburnt fuel
Stands to reason that the day after I get home for the summer, the Jeep would crap out on me. I was cruising along in 4th gear yesterday and I noticed it was running kind of rough. It got progressively worse, to the point where it obviously wasn't running on all cylinders. I can feel a slap in the exhaust, and the exhaust reeks of unburnt fuel. Checked for codes, originally got 27 and 11. Here's what I have done so far:
Cleared the codes, problem persists, code 27 came back, 11 did not
(For reference, the O2 sensor is < 6 months old)
Went around pulling the plugs off the injectors to try and isolate the cylinder. Cylinder 1 is the only cylinder that when I pull the injector plug off, the engine doesn't seem to change.
Checked spark, seems weak, yellow instead of whitish/blue
Plugged a spare injector into #1's plug, and I can feel the injector pulsing. So #1 is obviously getting electricity and at least some sort of signal.
Here's some of my ruminations so far. If the problem was solely with #1 injector, shouldn't the fuel smell go away when I pull the injector plug off? Because it didn't. I went around pulling all the injector plugs checking 1x1 for the smell to be gone but it never was. The problem gets progressively worse. When I first started testing today it wasn't that bad, but after about 30 minutes of running on and off it could barely maintain an idle, and stalled out several times. Spark is consistently weak on all of the cylinders, unless maybe the sparks only supposed to be a yellow? I was always told whitish/blue. Maybe the injector is stuck open? I haven't tried actually switching the injector yet, maybe I should try that. I've also read that it can be a bad ECM. Which I really hope its not.
Anyways, I have a headache from the fuel smell, so I'm stopping my testing for now. If you have any ideas please let me know I hate having nice weather and not being able to drive the Jeep.
Well, code #27 is the concern. Code#11 is as well, but she is running otherwise. Could be a bad cpk sensor in the dizzy as the cause, but with #27, I would first check all the injectors with an Ohm meter and see if they all agree, or rather read the same. Unplug all injectors and read across the injector terminals with a meter and write down the values for each one. If one is out of the norm, then replace it. If all injectors read the same resistive value, then I would suspect the pick up sensor in the distributer as to the cause.
I think I found the problem
Cant see pics at work Nathtan, what was it?
The wires on the oxygen sensor are completely ripped off
lol yep that will do it.
Well I put the new sensor in, started her up and she ran for a minute or so and then stalled. Now she won't stay running for more than a few seconds, if I can even get her started
Well got her started, added some gas and let her sit. Got the engine up to operating temperature and still running rough and throwing code 27. And still dumping fuel out the exhaust. Codes have been cleared but they just come back. I unplugged the oxygen sensor while it was running and it made no change. I'm thinking maybe something with the wiring of the oxygen sensor is wrong. I'm getting frustrated though
Code 27: INJECTOR #1-6 CONTROL CIRCUIT. Condition is: injector output driver does not respond properly to Powertrain Control Module (PCM) control signal.
TEST FC-19A - INJECTOR #1 CONTROL CIRCUIT
NOTE: For connector terminal identification, see CONNECTOR
IDENTIFICATION at beginning of article. For wiring diagrams,
see L - WIRING DIAGRAMS article in the ENGINE PERFORMANCE
1) Using DRB-II, erase fault messages. Attempt to start
engine. If engine will not start, crank engine for at least 10
2) Using DRB-II, read fault messages. If engine started,
allow engine to idle for at least 20 seconds. If DRB-II does not
display INJECTOR #1 CONTROL CIRCUIT, condition required to set fault
is not present at this time. Go to next step. If DRB-II displays
INJECTOR #1 CONTROL CIRCUIT, go to step 6).
3) INJECTOR #1 CONTROL CIRCUIT fault sets if Powertrain
Control Module (PCM) does not detect injector "turn off edge" when
expected. Possible causes are: open or shorted injector ground circuit
(White/Dark Blue wire), open injector power supply circuit (Dark
Green/Orange wire on XJ and YJ bodies or Dark Green/Black wire on ZJ
body), open injector, or failed driver in Powertrain Control Module
(PCM). Go to next step.
4) Inspect all related wiring and connectors and repair as
necessary. Perform TEST VER-1. If no problems were found with wiring
and connectors, go to next step.
5) Start engine. Wiggle wiring harness from injector No. 1 to
Powertrain Control Module (PCM). If engine misfires or stalls, repair
wiring harness as necessary. Perform TEST VER-1. If engine does not
misfire or stall, see INACTIVE FAULT CONDITION. Perform TEST VER-1.
6) Turn ignition off. Disconnect injector No. 1 connector.
Using an external ohmmeter, check resistance of injector No. 1. If
resistance is not 10-16 ohms, replace injector. Perform TEST VER-1. If
resistance is 10-16 ohms, turn ignition on. Using DRB-II, actuate
injector No. 1.
7) Using DRB-II in voltmeter mode, check voltage on injector
connector (harness side) Dark Green/Orange wire on XJ and YJ bodies or
Dark Green/Black wire on ZJ body. If voltage is less than 10 volts,
repair open in Dark Green/Orange wire on XJ and YJ bodies or Dark
Green/Black wire on ZJ body. Perform TEST VER-1.
8) If voltage is more than 10 volts, turn ignition off.
Disconnect Powertrain Control Module (PCM) connector. Using an
external ohmmeter, check resistance of injector driver circuit
(White/Dark Blue wire), between PCM connector terminal No. 16 and
injector connector. If resistance is less than 5 ohms, go to next
step. If resistance is more than 5 ohms, repair open in White/Dark
Blue wire. Perform TEST VER-1.
9) Using DRB-II in ohmmeter mode, check resistance of PCM
connector terminal No. 16, injector driver circuit (White/Dark Blue
wire). If resistance is less than 5 ohms, repair short to ground in
White/Dark Blue wire. Perform TEST VER-1. If resistance is more than 5
ohms, replace PCM. Perform TEST VER-1.
All injectors come in at around 14 ohms.
Tested voltage on injector harness, but did they want me to test it against a ground or against the other wire or against the positive terminal in the battery or what? I tested it against a ground and got roughly 13 volts.
Checked resistance between pcm pin 16 and injector connector and got 0 ohms.
And then check resistance of pcm pin 16....Again, against what? I checked it against ground and got infinity ohms.
its not the pcm. did you disconnect the battery after replacing the sensor?
EDIT: Messing around with it some more and now I've got a code 11 as well
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