Quote:
Originally Posted by chris_eitniear
Under the hood is where I first noticed it when I was changing the plugs on the back side of the motor.
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I noticed that wiggling the fuel line connection, the quick release snaps, when I work around the back top of the motor will release a few drops of gas on my 98. I assume there's an o-ring that is set and a little movement causes it to lose the seal because of the pressure residual from the pump still in the line. You might try wiggling those lines and watching. I have tried turning the key to ON and letting the pump pressure up and I get no leak--only if I move the line out of its resting place.
Did you put in the ACDelco plugs recommended by the books?
Since you moved the coils, did you rerun the code check to see if the misfire P number changed with that coil movement?
The slight miss at load at relatively low rpms in 4th such as a slight upgrade is exactly what I have had on my cars with wires aging. I can't duplicate the same miss as a lower road speed but same rpm in 3rd, even on a greater slope giving a little more load, because the higher ratio handles the load with less strain on the engine apparently. It would happen only in 4th.
Related to that, is it variable with how hot the engine is? E.g., does it happen only only warmer days after longer run time on a slope but doesn't happen when the outside temp is cooler and the engine hasn't been running as long? I am thinking you might have a seep of coolant around a gasket that is affecting only certain cylinders and only when cooling system is under high pressure (15 pounds).
My thinking that a small coolant seep might not show on short drives in loss of coolant in the reservoir tank. The mechanic who did my UIM and LIM gaskets showed me the throttle body gasket and how they were all too thin originally and end up giving a seep. You have not said anything about UIM and LIM gaskets having been replaced on this car. It should have had a recall on it where GM put stronger nuts and washers to press harder on the throttle body gasket and put in the ground pecan shell/water pump coolant pills (Barr's in Gold package) to fill seeps and block them, hopefully. If you really want to take a look, you could remove throttle body, clean it, and replace gasket with a new one.
Total Miles on the car hasn't been given in any post, but you might want to do UIM and LIM gaskets.