I have a 95 grand am se, quad 4. I have replaced plugs with bosch quad platinum plugs, new "boots", new bosch 02 sensor, new tires, several cans of seafoam, fresh oil,, filter, and air filter and it runs smooth, no MIL. I get about 13-16 mpg. I am stumped
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I have used all brands of spark plugs over many years...the AC Delco Platinum tip proves best for your Grand Prix...also use high quality plug wires not the cheapest (do not recommend Bosch plugs or wires...many issues of breakdowns) Ask the parts person what the plug gap should be, and measure and confirm this on each plug prior to installation...also highly recommend you use anti-seize libricant on the threads of the plugs...also recommend use electrical lubricant when installing th new wires...best for sealing and future service:)
The Quad 4 does not have plug wires. The engine cover plate has 4 bolts. remove them and lift straight up on the cover. the sparkplug boots will come up with the cover plate. They are protruding strait down from the coils(4) and the plugs are down in the valley between the cam towers if you have the DOHC or behind the cam tower if you have the SOHC.
Remove the crank sensor and test the resistance between the two pins. You may find you won't have any, meaning the internal circuit is broken. If you have a very low resistance (usually under 200 ohms) then it is shorted and the PCM won't be able to read it. I also just fixed a car with this issue where the CPS sensor simply came unplugged.
Don't you hate when that happens? You didn't cross any wires. rotate the plug wire boot as you push it on untill you feel a snap or click. Now the air filter. Check the maf sensor. the first sensor in the duct coming out of filtr. It musy be snug and no air leaks in thr duct. check the clamps at each end. if that doesn't help get back to me. and don't fotget to fill in thr ratings please
these sensors are the subject of many technical service bulletins (TSB's), they give false coolant low readings, there is a new sensor avail that they say works better and is less prone to this false trouble signal of low coolant, contact your local dealer.
Make sure you're using the recommended spark plugs. When my car did that, I had put Bosch Platinum Plus-4 plugs in and got that same problem. Turns out the plugs are too hot and cause it to fire prematurely and kick the misfire code.