QuestionQUESTION: Pulled these codes off cheeck engine light on my 94 lhs 25 43 21 33 41 it was running and died on thruway while acceleratiing now it just cranks but wont fire do you have any ideas
ANSWER: Hi Jason,
This is an entirely different set of codes than you first told me.
25 idle air control motor
43 one or more of the circuits that drive the ignition coil is not right
21 one of the oxygen sensors is not working
33 ac clutch relay is not working
41 alternator field not responding properly
Only the ignition coil would would likely cause it to die
I wonder if you are accurately counting the flashes. Did you also get a 55?
Here is what I responded to your first question:
The 12 means the battery power to the engine computer was disconnected sometime in the past 100 key on-off cycles. Unless this is not the case, set it aside.
The 54 means the signal from the camshaft position sensor is absent. That sensor is located on the front of the engine on the surface of the timing cover
The 32 means the exhaust gas recirculation valve or its circuit is not working properly when tested. I would suggest you try squirting some WD-40 on the stem of the egr valve where it enters the valve body and move the stem back and forth against internal spring-action which tries to close it to a dead stop. Typically you get a code because the valve stem operation get 'gummy' due to exhaust gas crud that builds up over time.
The 13 means the manifold absolute pressure sensor is not showing a change in its output even though the pressure changes. It may need to be replaced, but start by verifying the wire harness is undamaged. Let me know which L size engine you have as the MAP sensor location is different depending upon that.
34 means the cruise control circuit has a problem.
Now you have an extra '1', so repeat the readout to see if you can pickup any extra flashes. Also did you get at the end two groups of 5 flashes each that you didn't list? Those should always be there because they mean 'end of readout'. If not, then maybe final 3 4 1 might be a misreading of the double 5?
Let me know what you get when you do the readout again.
If the counts are correct then I would start with changing out the cam sensor, lubricating the egr valve stem, and replacing the MAP sensor if the flash counts remain unchanged.
Roland
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QUESTION: Ok just redid 3 times to be cetain this is what I have 12 54 33 33 41 55 not sure why I got 33 twice but it was consistent. So what are your thoughts. Again sorry for the mis reads and thanks for the help
ANSWER: If this is correct, then the one item that will definitely cause a no start is the 54, which is the camshaft position sensor located on the timing cover at the front of the engine. It has tan/yellow and black/light blue wires. You put in the new one until the tip touches the hidden surface inside (the cam sprocket) and hold it there while you tighten the retaining screw.
Roland
PS Please 'rate' my answer and where you see the question about a 'nomination for volunteer of the month' consider giving a 'yes' response. Thank you
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QUESTION: Ok while waiting for sensor i disconnected battery and charged reconnected changed camshaft sensor and tried to start. Same condition cranks wont fire. Rechecked codes and I now have 12 54 55: where would you go from here
AnswerHi Jason,
If we assume that the sensor was installed properly, then the most likely possibility is that the camshaft is not turning because the timing belt has broken. That would be if you have the 3.5L engine, which has the timing BELT. The 3.3L has a timing chain so is unlikely to have that break. Remove the timing belt round stamped cover, on the top corner of the front right side of the engine, enough for you to see if the cam sprocket is moving or not when a helper cranks it over. Another way to tell would be to see if you have any compression by removing one of the spark plugs. No compression would be a sign of no valve movement meaning no timing belt. One last possibility, if the belt is OK is that there is an electrical disconnect between the sensor plug and the powertrain control module.
Roland
