Engine ping only when warm.
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Engine ping only when warm.
I have a 93 explorer. When the engine is cold I can hit the gas to the floor and everything is fine. As soon as it warms up to running temp and I give it a little gas or put a little load on the engine, like climb a small hill my truck starts pinging the valves pretty bad. The ping is a sound of valves banging bad. It is not low on oil and it has good oil presure. Could this be an air fuel mix problem like pre igniting. Please, can anyone help as this is my primary vehicle and I need it tip top. Thanks for reading.
Last edited by terriblet63; Dec 12, 2009 at 08:47 PM. Reason: Put in more info
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I dont have headers it is stock manifold. Could the problem still occur? I have the 4.0 6cyl.
Postmaster
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From: UT
The ping is a sound of valves banging bad. It is not low on oil and it has good oil presure. Could this be an air fuel mix problem like pre igniting.
dirty MAF sensor, which leads to a slightly lean mixture (MAF can be cleaned carefully).
loose lower intake manifold. bolts seem to back out over time. Usually simply tightening the bolts up to spec is enough to cure.
carbon build-up in the cylinders. in these cases, a good de-carbonizing treatment can fix the issue.
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It seems to be valve clatter to me. I mean this thing is really banging around.
To me, there's a big difference in sound between valve clatter and pre-ignition/spark knock (which is usually what I think of when someone says "ping"). The conditions you describe are commonly associated with spark knock on this engine. Common causes are:
dirty MAF sensor, which leads to a slightly lean mixture (MAF can be cleaned carefully).
loose lower intake manifold. bolts seem to back out over time. Usually simply tightening the bolts up to spec is enough to cure.
carbon build-up in the cylinders. in these cases, a good de-carbonizing treatment can fix the issue.
dirty MAF sensor, which leads to a slightly lean mixture (MAF can be cleaned carefully).
loose lower intake manifold. bolts seem to back out over time. Usually simply tightening the bolts up to spec is enough to cure.
carbon build-up in the cylinders. in these cases, a good de-carbonizing treatment can fix the issue.
Postmaster
Joined: Dec 2001
Posts: 3,742
Likes: 2
From: UT
Any doubt in your mind about it being valves? These conditions:
are very commonly associated with spark knock on these engines. If there's any doubt, I'd suggest looking at those few things that are common causes of spark knock. If you are certain it's valves, I'd probably start by checking the oil pressure, to make sure it isn't dropping off under those conditions.
As soon as it warms up to running temp and I give it a little gas or put a little load on the engine, like climb a small hill my truck starts pinging
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