QuestionQUESTION: i just replaced head gaskets and timing chains and waterpump in a 2000 concorde with a 2.7 also put new plugs in it car wont start and now can only get 1 cylinder to fire? injectors are all working checked with diode lights and i checked and have 150lbs compression in each cylinder all coil wire grounds are grounded i checked with a test light but only 1 cylinder makes the test light flash when i crank the engine?also the cruise light comes on when canking so i switched out the cam sensor but nothing changed.
ANSWER: Hi Steve,
Try getting the diagnostic fault codes using the ignition key: "on-off-on-off-on and leave on" doing that in 5 seconds or less elapsed time. Then watch the odometer window to see if the mileage reading is replaced by a 4-digit number preceded by a P. Let me know what you find and we'll go from there.
Roland
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QUESTION: yes i got p 1684
ANSWER: Hi Steve,
The spark coils are powered by the fuse S if the automatic shutdown relay has gotten the "close" signal from the PCM while you are cranking it over. So check whether you have 12v solidly showing on fuse S while you are cranking it over. The other components on that same circuit are the two capacitors(one on each cylinder bank) that are also given the same 12v from fuse S, in parallel with the spark coils. So verify the you reconnected those capacitor to their plugs when you reassembled the heads. Also, the 12v wire (dark green/light green) from fuse S goes through a 14-pin black disconnect located near the right head (by the pcm plugs) on pin 1 of that disconnect and then goes to spark coils and capacitors, so check for that disconnect to be reconnected and the it too shows 12v when cranking over the engine.
I suspect that 12v supply to the spark coils in impaired because you don't have a fault code related to the "driver" wire side of the coils. That 1684 simply means that the battery supply to the PCM was disconnected recently which it probably was during the repair process.
Roland
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QUESTION: thanks for your help but i do not know what u mean by fuse S? the two capacitors are actually grounded to the rear bolt on the center of the valve cover its a good solid ground does it make a difference which bolt its grounded to? there is one on each side.i also rechecked the code it also showed a 0123 (throttle pos.) and a 0113 (air)i got these codes from a scan tool this morning my frend the mechanic said it had nothing to do with my problem , spark going only to 1 coil (front one on drivers side}i never disconnected the 14 pin connecter while working on it i did just now and reconnected it it looks normal. by right side ,you mean drvers side,right? any other idead on what to check? im gettin desperate!its gettin frustrating had car put back together almost 3 weeks ago still cant get it to run.
thanks
steve
AnswerHi Steve,
You didn't mention anything about voltage measurement. Do you have a volt-ohm meter?
Fuse S is one of 6 20 amp fuses in the power distribution box in the engine compartment, lined up together across the front of the box as O through T (counting inboard to outboard) and might be called "ASD fuse". That is the fuse you need to verify is putting through 12v when you are cranking it over, and also verify that it is present on any one of the spark coil plug-ins on that dark green/light green wire of the plug. As to the two capacitors, each should have a dark green/light green wire which shows 12v when cranking, it doesn't matter how the body of the capacitor is grounded to the engine just so it is grounded.
So the important question to first answer is are the spark coils all showing 12v on their plug pins that are attached to the dark green/light green wire when you are cranking it over. That wire is attached to pin 1 of the coil plugs.
No need to be desperate. It is probably something simple that will be found.
Roland
PS The fact that you are also getting the 0113 and 0123 codes suggests that either there is something at fault in the voltage supply to them (5V on the violet/white wire) or they aren't connected or their harnesses are damaged. The fact that you do get one spark suggests that there may be an issue with the crank sensor (which times the spark, rather than the cam sensor which says where to spark) though ideally you would get an 0320 code if that were the case. That sensor needs an 8v supply on an orange wire so check that out there and also at the cam sensor plug. Thus a voltmeter would be a useful tool if you don't have one.
