92 Mercury Grand Marquis 176K 4.6L - hard cold or damp weather starts, engine knocks upon hard acceleration or hill, no check engine light, EGR valve replaced 6months ago.
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have the timing checked if its off it could be pre-ignition which some people describe as a knock. if its a heavy knocking noise it could be a piston noise or it may even be a bad crankshaft/connecting rod/bearing. have the oil pressure checked this may help to know what to do. some people describe a rocker noise as a knock but its more like a ticking noise at the top end in the area of the valve covers.
When you say the engine is hot are you talking about the normal operating temperature? Has the Check Engine or Service Engine light come? If so, was the On Board Diagnostics system checked for a codes? Usually a knocking sound during acceleration indicates a improper fuel mixture or low octane.
The code is for the sensor for the EGR valve. The sensor is sending the computer a high voltage when it should be low. The sensor and valve would need to be tested.
it most likely is a spark knock ( ping ) try using high test fuel if the ping goes away try cleaning or replace the EGR valve . ( exhust gas recerulating valve ).
First, there are 8 bolts holding the metal Airhorn to the Intake manifold. Underneath this part is a gasket and under the gasket is a groove. The groove can Carbon up and affect the performance of your car. The gasket costs $10 and the job takes an hour or more.
If this does not help, you may need a knock sensor which is suppose to reduce the timing and keep the engine from knocking.
You can also get a free scan from Autozone or Oreillys and some other parts stores. This may tell you if other parts are needed. The gasket and groove I told you about will sometimes generate a Code 401. Just try cleaning the groove instead of buying an EGR or Solenoid.
its the tube going from the egr valve to your exhaust it have carbon build up and you either have to replace it or get a metal coat hanger and clean it out.
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