I have a 95 Saturn 1.9 double overhead cam. When I rapidly hit the accelerator the engine has a spark knock sound, I was told it could be a stretched timing chain, I checked the compression on all 4 cylinders and the compression is fine, this tells me the chain hasn't jumped. Could the chain still be stretched to the point it's hitting the outer case, If it is stretched why hasn't it jumped, it runs to good to be out of time. I'm leaning more to a spark knock caused by a sensor. I replaced the MAP sensor with a new one, I also replaced the Electric (not vacum) EGR valve with a new one, and a new knock sensor, and a coolant temperture sensor, nothing helped. The engine also surges up and down. One more thing, I used a scanner on this vehicle and no trouble codes were found, but when I use the scaner to view data, I'm getting a Quad driver 2 bad, I was told this is in the computer, I tried a second hand computer and still get the same data, this tells me something else is giving me the bad quad driver reading.I also read that when this problem is corrected the quad driver should reset itself. Any suggestions would be deeply appreciated. Thanks
have the same problem?
Friday, November 10th, 2006 AT 11:16 AM