98 4.6l pinging
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Joined: Nov 2004
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98 4.6l pinging
I have a 98 f150 4.6l with about 150k on it. It drives perfectly except for pinging/knocking under acceleration. I have taken it to a dealer several times, have cleaned off the maf several times, tried different air filters, replaced the pcv valve, cleaned all the passages in the intake manifold, checked the egr valve, replaced the iac (I think?) valve that's right next to the egr valve, changed spark plug wires, spark plugs, fuel filter, cleaned injectors, blah blah blah. I even tried some stupid resistor for the maf that you can get off ebay-nothing. The only thing that ever helps is running 92 octane gas, which gets rid off most of it.
I live in Seattle where the air is rich, and it seems that the stupid thing just runs lean, I have no engine codes, any suggestions on achieving a richer fuel mixture?
I live in Seattle where the air is rich, and it seems that the stupid thing just runs lean, I have no engine codes, any suggestions on achieving a richer fuel mixture?
Last edited by faranks; Nov 15, 2004 at 12:28 AM. Reason: misnamed part
Elder User
Joined: Sep 2004
Posts: 538
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From: Florida
I had an '88 with 5.0 that ran the same way. I put up with it for 9 years and 200K miles (it still didn't burn a drop of oil) and dumped it for my Ranger.
If you were going to throw any more money at it, I'd suggest the Diablo tuner. That way you can get a clean operating program in the computer and then retard the timing as necessary for regular gas. Even without the 'enhanced performance' attributes, the Diablo is nice because it allows the user access to all that computer controlled stuff without having to deal with the service department of the local dealer.
If you were going to throw any more money at it, I'd suggest the Diablo tuner. That way you can get a clean operating program in the computer and then retard the timing as necessary for regular gas. Even without the 'enhanced performance' attributes, the Diablo is nice because it allows the user access to all that computer controlled stuff without having to deal with the service department of the local dealer.
Freshman User
Joined: Nov 2004
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Other Then Diablo?
I have a few customers with the same problem, they have been to the dealer and there complaint was " Engine Ping" under acceleration, I have one truck in particular. I have Tuned it with all Ford Parts, New Ford O2 Sensors, Cleaned MAF and TB, outcome "PING".
I spoke to a mechanic from a local for dealer and he agreed this is a problem.
It's hard to suggest to a customer to install a aftermaket product to fix his factory truck!
Any Ford Mech's Who want to add to this ?
Mr.Rob
Lic Mech Auto, Truck, Trailer ......
I spoke to a mechanic from a local for dealer and he agreed this is a problem.
It's hard to suggest to a customer to install a aftermaket product to fix his factory truck!
Any Ford Mech's Who want to add to this ?
Mr.Rob
Lic Mech Auto, Truck, Trailer ......
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Freshman User
Joined: Oct 2004
Posts: 27
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From: Orange, TX
Gas??
My Dads 4.6 Towncar is doing the same thing. I did some checks and could not find anything wrong. It has 50K miles. No codes. This pinging started all of the sudden. I believe this is getting to be a common problem, since I'm reading more complaints. Just wondering if it the quaility of gas we are getting now? I find it hard to believe you must have the computer reprogramed. Doing this means a variable has changed.
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Joe Kucinski
Senior User
Joined: Jul 2004
Posts: 221
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the problem is the design of the coolant going into the back of the head, it creates a hot spot and causes the ping.
A company did a coolant mod which forced more coolant into different areas. I think you can read about it on modulardepot.com.
Its mostly used in high boost application motors that are sensitive to knock, but i can see it helping here.
The only problem is that in a car the motor needs to come out, not sure about a truck but I would guess the same thing, because you are working with the back of the engine and the head.
Before I did this coolant mod to my truck, i'm just going to put a 12c copper plug in there, which is two ranges colder than stock.
This plug will probably only be good for 20k miles, but i would rather replace a plug then put 93 octane in a gas guzzler truck.
How about some reputation points for that one?
JH
A company did a coolant mod which forced more coolant into different areas. I think you can read about it on modulardepot.com.
Its mostly used in high boost application motors that are sensitive to knock, but i can see it helping here.
The only problem is that in a car the motor needs to come out, not sure about a truck but I would guess the same thing, because you are working with the back of the engine and the head.
Before I did this coolant mod to my truck, i'm just going to put a 12c copper plug in there, which is two ranges colder than stock.
This plug will probably only be good for 20k miles, but i would rather replace a plug then put 93 octane in a gas guzzler truck.
How about some reputation points for that one?
JH
Freshman User
Joined: Nov 2004
Posts: 39
Likes: 0
Funny!
I have a buddy who is a Ford Master Tech, I told him on my customers Truck we did the following.
Tune Up (Plugs/ Wires) - Ford
O2 Sensors (3)
Filters (Air/Fuel/PCV)
Injector Clean (MotoVac)
Throttle Body Sevice
No Codes
Result
Engine Pings under hard Acceleration.
I was looking at one of the acticles here and somebody mentioned a possible EGR problem I did notice when driving the truck it has a sort if droan noise when Accelerating.
Any Opinions on maybe a EGR Problem?
Mr.Rob
Tune Up (Plugs/ Wires) - Ford
O2 Sensors (3)
Filters (Air/Fuel/PCV)
Injector Clean (MotoVac)
Throttle Body Sevice
No Codes
Result
Engine Pings under hard Acceleration.
I was looking at one of the acticles here and somebody mentioned a possible EGR problem I did notice when driving the truck it has a sort if droan noise when Accelerating.
Any Opinions on maybe a EGR Problem?
Mr.Rob
New User
Joined: Nov 2004
Posts: 18
Likes: 0
You need to get somebody who has a scan tool that can moniter the engine while in the shop and driving. If the mass is giving the wrong baro reading to the pcm than it can cause spark ping. You need to compare the baro reading to the altitude you live in. Also carbon build up is common in enigines with more miles. This contributes to ping also. Even though t-body cleaning and injector cleaning may have been done it don't always work. Higher octane fuel may be the only help even though its expensive, it beats buying a motor. I don't argree with cleaning the mass because the are so sensative. Stopped up cats can play a large roll in the problem also.
J-marr1
J-marr1
Junior User
Joined: Jan 2004
Posts: 67
Likes: 0
From: Kansas City, MO
my 1997 4.6L pings under acceleration, too, and i have been chasing it for about 4 months. new MAF, new IAC, new plugs, new O2 sensors, new EGR. didn't help. had it in at ford last week and was told that this is just a common problem with the 4.6L but it's nothing to worry about (thinking that i might not go back to that dealership, actually). they reflashed the computer for me and then retarded the timing a bit saying that would help. it didn't. going out to replace the plug wires this afternoon.
i also bought a new knock sensor (willing to try damned near anything at this point!). can anyone tell me where the knock sensor is? my chilton's manual says that it's under the intake assembly, a website i checked out said it's on the side of the block somewhere, and a ford mechanic told me over the phone that it's inside the oil pan. if anyone can help guide me to it, i'll post the results of replacing it.
-bjw
i also bought a new knock sensor (willing to try damned near anything at this point!). can anyone tell me where the knock sensor is? my chilton's manual says that it's under the intake assembly, a website i checked out said it's on the side of the block somewhere, and a ford mechanic told me over the phone that it's inside the oil pan. if anyone can help guide me to it, i'll post the results of replacing it.
-bjw
Junior User
Joined: Aug 2002
Posts: 96
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Faranks - do you happen to have the FOU1 ECU code?
The cooling mod took care of my pinging.
Cooling Mod
And here are some of the details of my before/after analysis of the mod.
My results
The cooling mod took care of my pinging.
Cooling Mod
And here are some of the details of my before/after analysis of the mod.
My results
Last edited by Ted98; Dec 22, 2004 at 03:48 PM.