Question about Cars & Trucks
I have a 2001 Mercury Sable LS with a 3.0L DOHC engine. During initial acceleration when the engine is warm, I hear a loud pinging that sounds like spark knock to me, but only for about a second or so. I've checked the vacuum lines and they are in good shape. The engine is pulling 17 in-hg of vacuum at idle. The EGR valve is holding vacuum as well. I checked the resistance on the EGR solenoid, which should be 20 ohms, and it was 38 ohms. Is that enough to make that much of a difference? The engine is not missing, as far as I can tell, and the check engine light has not come on at all. I also have a light ticking sound while driving, quiet enough that I'm still not sure I'm not imagining it. Any help would be appreciated.
Many older Ford products don't have anti knock sensor circuit so most likely your hearing your cylinder valve's death rattle. Higher OCTANE gas will help. Break a valve junk the car.
Posted on Jul 13, 2013
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Posted on Jan 02, 2017
do not use any fuel additives at all. and only use 87 octane fuel nothing higher. 4.6 and 5.4 ford engines do have a pinging sound especially with a load. but it is normal
Posted on Sep 02, 2009
let me guess....... you are using regular 87 octane gas ? run it down to almost empty and fill it with super and see it it works you probably have about 100,000 miles on it the camshaft, lifters and valve springs, timing chain are all worn
Posted on Oct 02, 2010
Hello, Thomas. Check the knock sensor. This sensor is suppose to send signal to the computer if the engine start to knocking or pinging. The computer will change the setting on various other components to keep from doing this knocking or pinging. I remember in the older cars that weren't fuel injected but carbureted and had to burn high octane fuel. If one put low octane in the fuel tank the engine would knock/ping, and continue to run after the ignition was turned off. Try the knock sensor or do an diagnosis test on it. Look in your owner manual it tell how to self diagnosis test on you car. GB....stewbison
Posted on Sep 07, 2011
SOURCE: I have a 2002 Mercury Sable with the 3.0 DOHC engine. The check engine light came on and the code read EGR system pressure feedback. I have put in a new EGR valve, pressure feedback sensor, solenoid,
The vacuum lines are incorrect,that or the EGR solenoid is restricted,causing the EGR to open
Posted on Sep 26, 2012
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