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Knock Sensor Installed but now more trouble

I recently had a knock sensor installed after my 94 SW2 with 100K miles on the motor/trans indicated the knock sensor was bad via the code reader and the symptoms were high rpm's and low power and check engine light on. I have had this new knock sensor installed and had no more trouble for 1 week but yesterday on the freeway the rpm's shot up to 4K higher than before and the speed dropped from 75 to 60 mph and then the temperature doubled and the check engine light went on. I immediately turned on the heater to cool the engine down and limped all the way to my mechanic. The mechanic had trouble with his computer and removed the code on my car. Any ideas as to my trouble and which is a good code reader for a 94 Saturn SW2 that I can purchase? Is it possible when my mechanic installed the knock sensor he needed to do something else after installation or is this a whole new problem?

Thanks Linda

Reply to
Linda
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On a '94, you shouldn't need a code reader. It is an OBD1 system. There is a proceedure at the reader plug by jumping two terminals and read the flashing check engine light. I don't recall the terminals to jump at this time. You will get 3 flash series of 12, then the flashing codes. Once code 12 flashes again, you have them all.

A code 12 will be 1 flash, short pause, then 2 flashes. After 3 series of 12s, the actual codes will appear with the same method.

James

Reply to
James1549

I am not aware of anything more you need to do after installing a new knock sensor.

Clearing all codes is recommended after a repair but will not cause problems. Be sure to have someone check your battery condtion and charging system. A battery going bad can cause all kinds of strange things to electronic sytems.

James

Reply to
James1549

James, One more thing on the 94 twin cam is there a carborator of fuel injection? I have a Haynes shop manual but it doesn' seem to indicate some had carbs. Lin

Reply to
Linda

They never had carbs

----------------- TheSnoMan.com

Reply to
SnoMan

If you insist on a Code Reader for your Saturn, I would suggest this one:

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All fuel injection.

James

Reply to
James1549

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