Hello back. ..
I am beginning to wonder whether we're communicating. You say the plug wire should point to the point where the plug wire is attached. I have to say NO to that. Remove the distributor cap and look underneath.
Doesn't it look like a spider web in there? The cap underneath will have all 8 little nubs in a circle. You need to look at number 1 spark hole, (where the wire attach's), then turn the cap upside down and trace that connection to the little nub on the cap.
The little metal nub will not be right by that hole. I hope this makes sense. If it doesn't, we need to make sure we are on the same page here.
Also, below I have included some descriptions for the codes that are showing up. You will notice the cam sensor codes are related to your timing. The cam sensor itself is located inside the dist. You timing needs to be on for this to work. It fires the injectors at the right time when your timing is correct.
Your mass air sensor could also be related, maybe not. Right now you need to have your timing on before you start diagnosing any other problems.
I wouldn't run out and buy a timing light. At least not yet anyway. Get this timing on, and then see if moving the dist. a little one way or the other will help.
By the way, you say your engine is missing a little or running erratic. Well, this makes sense with your timing being off. The injectors are not being fired when they are supposed to.
Mass Air Flow (MAF) Sensor
The mass air flow (MAF) sensor measures the amount of air entering the engine. The VCM uses this information to determine the operating condition of the engine in order to control the fuel delivery. A large quantity of air indicates an acceleration. A small quantity of air indicates a deceleration or an idle.
The scan tool reads the MAF value and displays the MAF value in grams per second (gm/sec). At idle, the MAF value should read between 5 gm/sec - 7 gm/sec on a fully warmed up engine. The values should change rather quickly on acceleration, but values should remain fairly stable at any given RPM. When the VCM detects a malfunction in the MAF sensor circuit, the following DTCs will set:
| • ||DTC P0101 System Performance|
| • ||DTC P0102 Frequency Low|
| • ||DTC P0103 Frequency High|
Camshaft Position Sensor
The scan tool scan tool will display camshaft position sensor data as a 0 and 1 as the sensor pulses, the scan data will switch from 0 to 1. All camshaft position sensor data should be checked at idle. An error in the camshaft position sensor circuit should set a DTC P0340. The camshaft position sensor sends a signal to the VCM which uses it as a sync pulse to trigger the injectors in proper sequence.
The VCM uses this signal to determine the position of the #1 piston during its power stroke. This signal is used by the VCM to calculate fuel injection mode of operation. A loss of this signal will set DTC P0340.
If the cam signal is lost while the engine is running, the fuel injection system will shift to a calculated fuel injection mode based on the last fuel injection pulse, and the engine will continue to run. The engine can be restarted and will run in the calculated mode as long as the fault is present .
The distributor is actually an assembly that contains the camshaft position (CMP) sensor, the cap, the rotor, and the shaft. The distributor is splined by a helical gear to the camshaft and rotates providing a spark to each spark plug wire. When servicing the distributor, it is critical to ensure proper cap sealing to the distributor body and correct installation to the camshaft. If the distributor is installed a tooth off in relation to the camshaft, a DTC sets. The distributor is repairable.
Camshaft Position Sensor
The camshaft position (CMP) sensor is located within the distributor. The CMP operation is very similar to the crankshaft position (CKP) sensor, however the CMP provides one pulse per camshaft revolution (1X signal). This signal is not detrimental to the driveability of the vehicle. The VCM utilizes this signal in conjunction with the crankshaft position to determine which cylinders are misfiring.