Pinging 5.4
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Joined: Oct 2002
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From: Oak Ridge, Missouri
Pinging 5.4
Hello, I have a 2000 F-150 with a 5.4 engine. I bought it used about a year ago. It had 62,000 miles on it when I bought it. I had owned a 4x2 1999 F-150 with a 4.6 and suprisingly never had any pinging problems with it. I wanted a 4x4 and got the 2000 then.
To make a long story short, my truck pings every time I barely touch the accelerator. It idles fine, but pings when under a light load, such as driving on the road, even flat areas. I got to thinking about the EGR valve. I let the engine idle and brought it up to operating temperature and then applied a slight vacuum. The engine faltered and as soon as I released the vacuum, it recovered quickly. So I think the valve itself is fine. Then I checked the vacuum line going into the EGR solenoid and got great vacuum there at idle and higher RPMs. But, I believe that the solenoid or whatever controls it may be bad, because I hooked up a suction line to the soleniod out part, and drove it to see if the valve would ever open. It did, but just for 10 seconds maybe. The vacuum never returned, and I was doing 50 mph and was accelerating consistently on flat road.
So I got back home, and the vacuum line going into the solenoid from the main vacuum still had tremendous vacuum, but the soleniod would never open.
What voltage is applied to the solenoid? I took my voltmeter and measured the voltage across connector going in and got a consistent voltage, however, I got the same voltage at idle and going down the road. It never changed.
Could an EGR valve stay closed? I unhooked the vacuum line going to the EGR diaphram, and the check engine light never came on. But as soon as I disconnected the wire going to the solenoid, the light came on and stayed on.
The final question to my long boring post is the EGR soleniod valve normally closed when a voltage is applied to it, or is it normally open when a voltage is applied to it?
The EGR could explain why it is pinging, because the air going into the engine is not getting diluted with cooler exhaust air.
Sorry for this extremely long post. Thanks for any replies.
To make a long story short, my truck pings every time I barely touch the accelerator. It idles fine, but pings when under a light load, such as driving on the road, even flat areas. I got to thinking about the EGR valve. I let the engine idle and brought it up to operating temperature and then applied a slight vacuum. The engine faltered and as soon as I released the vacuum, it recovered quickly. So I think the valve itself is fine. Then I checked the vacuum line going into the EGR solenoid and got great vacuum there at idle and higher RPMs. But, I believe that the solenoid or whatever controls it may be bad, because I hooked up a suction line to the soleniod out part, and drove it to see if the valve would ever open. It did, but just for 10 seconds maybe. The vacuum never returned, and I was doing 50 mph and was accelerating consistently on flat road.
So I got back home, and the vacuum line going into the solenoid from the main vacuum still had tremendous vacuum, but the soleniod would never open.
What voltage is applied to the solenoid? I took my voltmeter and measured the voltage across connector going in and got a consistent voltage, however, I got the same voltage at idle and going down the road. It never changed.
Could an EGR valve stay closed? I unhooked the vacuum line going to the EGR diaphram, and the check engine light never came on. But as soon as I disconnected the wire going to the solenoid, the light came on and stayed on.
The final question to my long boring post is the EGR soleniod valve normally closed when a voltage is applied to it, or is it normally open when a voltage is applied to it?
The EGR could explain why it is pinging, because the air going into the engine is not getting diluted with cooler exhaust air.
Sorry for this extremely long post. Thanks for any replies.