Spark knock
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New User
Joined: Jan 2004
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From: Myrtle Beach
Spark knock
Somebody please help!!! I have a 1999 5.0L Eddie Bauer Explorer with 93,000 miles. For the last year I have had a persistent spark knock. It only happens after the engine warms up completely say 1hours worth of driving. I have tried many things from using all different types of grade gas, changed the spark plugs and wires, used injector cleaners and changed the anti knock sensor. Recently I changed the Mass airflow sensor, which greatly improved the situation but did not totally eliminate the problem. I have just read about Sea Foam does anyone think this may help?? Or is there something else I should do.
Freshman User
Joined: Jan 2004
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Where is the knock sensor on the 5.0L? Do you have to drain the coolant to change it (like a GM)?
I have a 99 with the same pinging problem. I'm planning on replacing the knock sensor, DPFE and cleaning the EGR, if I could just find some tips on how to best clean the EGR.
I'm also planning on cleaning the MAF wires, but I cannot find a consensus on the best way to do this. I've been told you can use a spray can of brake cleaner, but others here say you have to do the toothbrush thing.
I have a 99 with the same pinging problem. I'm planning on replacing the knock sensor, DPFE and cleaning the EGR, if I could just find some tips on how to best clean the EGR.
I'm also planning on cleaning the MAF wires, but I cannot find a consensus on the best way to do this. I've been told you can use a spray can of brake cleaner, but others here say you have to do the toothbrush thing.
New User
Joined: Dec 2003
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I am having the same problem with my '02 4.0 SOHC. Timing chain tensioner TSB has been performed and the engine was decarbed by the dealer. The MAF was also inspected and replaced I think. The only difference is that mine does it worse when the outside temp is cold and the engine is cold. Seems to get better after the engine warms up. I was thinking of replacing the DPFE sensor just to see. Hate to do this, but don't really have the time or the patience for the dealer any more. 3 trips for this and still no luck. Dealer has been really cool though. They just can't do a whole lot because there are no codes. Keep us posted as to what you find out.
Post Fiend
Joined: Feb 2003
Posts: 6,940
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From: Eastern WA
Originally posted by ric232
.......etc etc..............
I'm also planning on cleaning the MAF wires, but I cannot find a consensus on the best way to do this. I've been told you can use a spray can of brake cleaner, but others here say you have to do the toothbrush thing.
.......etc etc..............
I'm also planning on cleaning the MAF wires, but I cannot find a consensus on the best way to do this. I've been told you can use a spray can of brake cleaner, but others here say you have to do the toothbrush thing.
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New User
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The DPFE sensor was new to me as well. It is a differential Pressure Feedback EGR Sensor. It is mounted on the back of the upper intake manifold right above the EGR. It should have two tubes running down to the exhaist manifold. I have very detailed instructions on how to replace this and it made a world of difference on my truck. My instructions are archived on this forum under the thread "Ford Truck Enthusiasts Forums > Small Chassis Trucks > Explorer, Sport Trac, Mountaineer & Aviator > Check Engine Light Problem & Solution" from 10-04-2003
Post Fiend
Joined: Apr 2004
Posts: 5,158
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From: North of Salt Lake City
New DPFE part available from Ford
The new part available at Ford dealers is slightly larger than the original. I replaced the old one with a new one and my code has not come back. The new part at the dealer is cheaper too, $29. The part number is: 4U7Z 9J460 AA. Good luck. A very easy (and cheap now) fix. No tools needed.