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contributions: 15
cool, got the CEL to clear, drove her round, and it came back on, only 1 code for knock sensor- went ahead and threw the 35 bucks at it, and got a new sensor. Just got in from work- gonna hook the battery back up and run it for a while. Funny, the fogging has gone away :P Still gonna pressure test the cooling system later after I get the CEL issue sorted out- let ya know, thanks again


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contributions: 1990
Images: 37
Location: Oregon
congrats


   
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contributions: 15
eh, wel dangit,- tried to check fuel pressure- rental gauge didn't work, went ahead and got a fuel filter, and seemed to run a little better, then CEL came on again- po327, knock sensor. I'm figuring that I'm getting lean somehow, and making it ping- am I on the right track? I pulled the hose off the pressure regulator, and it smelled lightly like fuel, but no liquid gas came out the vacuum line. Engine isn't noisy...........this is definitely not my father's Oldsmobile- his ran good- lol


   
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contributions: 1990
Images: 37
Location: Oregon
a knock sensor code will affect the engine. the pcm advances spark timing and when the knock sensor is working the pcm will retard the timing if it see a knock situation. If you have a code stored the engine will run in default to protect the engine and emissions. some aftermarket knock sensors don't work right with the pcm. Check the wire to the knock sensor and see if it has 5 volt reference voltage (check at the knock sensor wire harness plug in, key on engine off knock sensor not plugged in) if you have % volts plug the knock sensor in and the voltage in the wire should go to about 2.5 volts. if you have 2.5 volts it should be ok. If you have some other voltage the resistance of the sensor may be wrong.


   
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contributions: 15
ok, here we- no voltage to the knocky sensor. Wire or defective PCM I'm guessing????? I guess if I can find which pin on the ecm, I can check voltage there? Where's the pcm? where's waldo?


   
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contributions: 15
ok, found the pcm under the dash, autozone had a diagram for a blue wire, terminal 33
don't know if this link will work- anyways, hooked up a wire tap to blue wire on 33, no voltage coming from it- nothing. For kicks, I pulled the pcm out- has a sticker on it saying it has been flashed. Do these go bad that often?
http://repairguide.autozone.com/znetrgs ... 2415ca.gif


   
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contributions: 1990
Images: 37
Location: Oregon
they do go bad. does your knock sensor have a single wire connector or does it have a two wire connector?


   
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contributions: 15
it is a single- there is a splice in the connection- I wonder if it shorted out at one time, and burned up the circuit. If I do get a new PCM- should I get one that is "flashed" to my application off ebay, or should I just get one off a wreck with same engine and transmission? Am I gonna end up at the dealership after all my trouble? I was going to go ahead and buy a scanner, as now I have 2 obd2 cars now, and I've read I'll have to relearn crankshaft variation on this if I pull a used computer from a wreck


   
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