Knock Sensor Circuit


Ran good for about 10 minutes, then it just abruptly died. Now it won't start unless I hold the pedal to the floor(clear flood mode). And when it starts, it won't idle without me giving it some throttle. Runs REALLY REALLY rough and smokes too.

Can the Knock Sensor circuit be the fault of all this? It's the ONLY code it's setting too.

 

After reading a LOT of threads on here, it seems that I wasn't supposed to use thread sealant on the knock sensor threads(or maybe just not as much as I used ) because it could be interfering with the grounding to block capabilities.

Guess I'll need to get me a multimeter and do the checks I have read about.


But still, would this cause the car to die and not start back all of a sudden?

 

No, the knock sensor system should not kill the engine.

 

 

This sux because now is NOT the time to be flooding the damn engine with fuel!

 

Weird... I just checked it and everything looks within spec. I'ma have to get a digital meter and try it again.

 

Changed the coil, ICM, and MAP sensor with no change.

 

You need to isolate the problem, and quit wasting your money installing random parts.

 

These are parts I have laying around.

 

OK, that's cool. Are you getting any more codes? Could be a PCM problem?

 

Nope, no codes. Just code 43.

 

Update on this...

After checking almost everything I could think of (drained gas out again...took off fuel rails to make sure no old gas was in them... map sensor...vacuum lines...coil...ICM... coil wire....checked for spark... IAC... TPS... probably some other stuff) I remembered a problem I had before the stock motor blew up. The opti harness connector...

On the old motor, I made a thread about how the car would suddenly die and sometimes would just run real rough and black smoke everywhere, replaced the harness with another one and it ran fine. But the motor blew a couple days after, so I'm not postive that fixed it.

Anyway... I went outside and wiggled the connector around and it fired right up! Ran for about 10 minutes then quit again. Wouldn't start. Wiggled it again.. fired right up. Tomorrow I will look into this problem a little more.

 

ECT Sensor!!!!!

Can't believe it!!

I have a scanner hooked up to it and for the last week have been noticing the coolant temp would fluctuate between -38 and ambient. I didn't know a whole lot about why it was doing that, but I didnt think it had anything to do with my problem. Well, after thinking about how it would make it run REAL rich if it was thinking the coolant was 38º below zero, I started diagnosing the sensor. Checked the ohms and the volts, then plugged it back in. Went back and looked at the scanner and it wasn't fluctuating anymore. Figured what the hell and tried to start it. Fired right up!! And ran for 30 minutes with no problems while I checked for leaks and topped off fluid levels!!


I guess my last two weeks of AGONY have just been the sensor wasn't making a good connection with the plug!!