fulo

Hi, this is general issue that I have observed. Please share your expertise, since mine need a refill.


The car started fine and run, but suddenly it will hesitate. It did it randomly.

At first I though I could be something a vacuum leak. Since I have a severe valve cover oil leakage, I decide to take advantage and replace valve cover gasket, check intake manifold gasket, etc. I disconnected the battery, remover the Ignition Coil and Fuel pump fuse.

Took my time cleaning the parts, replacing the gasket and putting everything back together. Then when I decided to star the car, the rough Idle I mention before suddenly became e heavy engine vibration. My first impression was that I must have put something wrong. So I discontented the battery and check the whole set up. Everything fine.

I checked the spark plug, spark plug wires, and check for spark. Everything fine. The ignition system seems to be working properly. I then decided to start the engine and disconnect the Crank Position sensor (engine stop as suppose too). Connected that sensor back and disconnected the Camshaft Sensor and no difference.

I decided to start the engine and then disconnect the sparkplug cable from each (running) cylinder to detect a change. I noticed that nothing happened when I disconnected the last to cylinders.

I have spark on every wire, so I must be the full ingestion, right? Connected everything back, started the engine (it vibrates heavy). I decide to disconnect the electrical connected of each full injector (kind like I did with the sparkplug wires). I notices that nothing change when I disable the last two injectors (same cylinder that where unaffected when disconnecting the spark plug wires).

So, in conclusion, I have to death cylinder. The ignition system is working, ans apparently the injectors might be faulty. But, then why northing happened when I disconnected the camshaft sensor. Since this sensor is the one responsible for determining when each injector fire the fuel to the intake manifold.

This is where my puzzle is. I not very experienced with fuel injected engines. I do not have an OBDII scanner yet (I ordered one, and should arrive in a week). My real question is what should happen when you disconnect the camshaft sensor on a running engine?

Thanks for reading this LONG post. I will really appreciate all your opinions.

X22SE

Regards

DENN_SHAH

iTrader: (1)

i take it you either bought your car with, or you had someone put a OBD2 PCM setup in your car.

on every car i have worked on for a cam sensor code problem, the cam sensor is used for sequential fuel injection, without it, it goes into batch fire for the injectors. it probably won't get as good fuel mileage as it should, it probably won't run as good as it should, it may be alittle harder to start, the check engine light
should be on & there should be a code set.

first thing i would do is check the compression on the 2 dead cylinders, while you have the spark plugs out for the compression test, check them, if the plugs & compression are good, then check the injectors.

fulo

The funny thing is, the compression on the the "dead" cylinders is the highest of all others. SHould there be a noticable change in engine idle when camshat sensor is disconneted?

I ordered the OBDII from Auto tap. I should have it by next week. I did clean lightly and quiclky the injectors whit some deagrease. I did ir carefully and Really quick. I did not soak the injectors. I mention this because the engine was running better before I did thid. Can one clean the injectors?

Like I mention, the engine missed in the past, specially if the AC was on. You will be driving and the suddenly it will miss and loose power. I had to rev it up and then problem temporay left.

I have more experience with carbs and regular ignitions. I prefer to keep things simple and realible. But hey, time is catchin up with me.