4.0 Engine ping
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New User
Joined: Jul 2003
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From: Mid--west
4.0 Engine ping
I have 2001 4X4 with a 4.0 automatic, and when I accelerate up to highway speed the motor has a pinging noise until I get up to speed. I haven't tried any fuel additives or anything like that. I have noticed a loss in gas milege. from 21.5 miles per gallon to 20 over the last 2 years.
any suggestions
Thanks, OF
any suggestions
Thanks, OF
Post Fiend
Joined: Jan 2003
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From: Connecticut
I've heard of a case or two where the SOHC upper intake gaskets were leaking, allowing unmetered air in and causing a lean condition. Running lean and pinging go hand-in-hand.
It's something to consider, anyway. Good luck.
It's something to consider, anyway. Good luck.
Post Fiend
Joined: Feb 2003
Posts: 6,940
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From: Eastern WA
A dirty MAF sensor is fair game. Also, I have to wonder if, given the problem description, the infamous timing chain issue is making itself known. Does the ping (noise) occur under other conditons, such as when the engine is warm and you step on it hard while going perhaps uphill, say 35MPH, and around 1300-1800rpm?
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It does not matter if the engine is cold or warm the pinging noise is the same, The pinging occurs only when I accelerate up to speed. Once I am up to speed and I let up on the gas pedle the ping goes away. When passing another vehicle I step on it hard it pings only for the first couple seconds. Where is the MAF sensor located ? If the Intake gaskets were leaking would it ping all the time or notice it more when the engine was cold ?
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Originally Posted by ohiofish
It does not matter if the engine is cold or warm the pinging noise is the same, The pinging occurs only when I accelerate up to speed. Once I am up to speed and I let up on the gas pedle the ping goes away. When passing another vehicle I step on it hard it pings only for the first couple seconds. Where is the MAF sensor located ? If the Intake gaskets were leaking would it ping all the time or notice it more when the engine was cold ?
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Joined: Oct 2004
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From: Nashville, TN
Originally Posted by CowboyBilly9Mile
A dirty MAF sensor is fair game.
A good cleaning and it runs great. Like el conquistador said above, be careful. Also, you must disconnect your negative battery terminal while cleaning it for about 10 minutes to reset the sensors or whatever.
I cleaned mine with some brake/carburator cleaner spray then with some rubbing alcohol. Runs almost brand new now.
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Thanks, SmokyMtnz that was my next Question ( what to clean the MAF with ) I will give it a try as soon as the weather breaks. we had no electric for 4 days then got flooded out.
Thanks OF
Thanks OF
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