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Mar 7, 2004 | 12:08 PM

Keith1984

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Pinging

98 F-150 with 4.6 romeo. Going up hills or romping on the gas causes pinging. I've run Lucas fuel system treatment, X1-R fuel system treatment, and a bit of 93 octane gas in there and notice no difference. Maybe it's just me but it seems to be a real dog on hills and on the highway the slightest incline makes it a battle to hold 65 mph. Don't know if that is normal for said truck/engine combo or an indication to the cause of ping. Any ideads? Thanks.

Mar 7, 2004 | 12:18 PM

LxMan1

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From: Louisville,Ky.

None of these trucks like pulling hills in OD.
I would try cleaning tha MAF. When they get dirty, they do not read airflow properly and it can lean out the fuel mixture.
Jimmy

Mar 7, 2004 | 12:30 PM

Keith1984

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That makes sense and would cause it to ping but isn't the knock sensor supposed to correct that?

Mar 7, 2004 | 12:46 PM

LxMan1

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From: Louisville,Ky.

I have never seen a knock sensor that actually eliminated all of the knock. I think that the PCM is only programmed to pull out so much timing and if that doesn't work, then it will still ping.
Jimmy

Mar 7, 2004 | 01:03 PM

Keith1984

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Probably makes sense, too bad I don't have a scan tool to view real time values. What's best to clean the MAF? A blast of carb cleaner?

Mar 7, 2004 | 04:50 PM

JustinH

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the 4.6 does not have a knock sensor.

If you are pinging, I would switch to an AWSF-22c spark plug and see if that gets rid of it.

You shouldn't need anything except 87 octane in your truck.

JH

Mar 7, 2004 | 05:45 PM

Keith1984

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Quote:

Originally posted by JustinH
the 4.6 does not have a knock sensor.

If you are pinging, I would switch to an AWSF-22c spark plug and see if that gets rid of it.

You shouldn't need anything except 87 octane in your truck.

JH

I run 87 in it. I used injector cleaner stuff cause I had a slightly rough idle which is now gone. When the ping developed I topped off with 93 octane to see if it would make a difference in the ping but didn't. The 4.6 does have a knock sensor. It is down in the lifter valley. Plugs probably could use a change but it's not missing or anything. I notice the ping to be slightly less if I hold a steady rpm, maybe a ign the knock sensor lives, lol?

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Mar 20, 2004 | 09:57 AM

Keith1984

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Well, with straight 93 octane in there it pings very very little. A copper plug ought to be good for like 20k in this engine? I'm going with the platinum plugs after I implement my chemical attack with Sea Foam. Got to be a nasty case of carbon buildup. I get no MIL and cleaning the MAF twice did nothing.