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  #1  
Old 05-12-2011, 03:46 PM
rcjwp rcjwp is offline
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Exclamation Loud Pinging/rattleing noise when under heavy acceleration, hills...

I have a '94 with the 4.0L V6, and when the rpm get above 2500+ It rattles or pings like crazy! Sounds like the engine is going to tear itself apart, so then I back-off the throttle...

So getting up to freeway speed takes a while.

I have tried higher octane gas from Shell and Chevron, but It doesnt correct itself.

What could be causing it? Does it sound like im in big trouble???
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  #2  
Old 05-12-2011, 03:52 PM
FireRanger FireRanger is offline
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Default Re: Loud Pinging/rattleing noise when under heavy acceleration, hills...

What have you done for regular maintenance lately? Plugs? Air filter? Fuel filter?
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  #3  
Old 05-12-2011, 04:16 PM
djfllmn djfllmn is offline
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Default Re: Loud Pinging/rattleing noise when under heavy acceleration, hills...

run some injector cleaner/seafoam through it and hit it with a tune up...that should solve your problem
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Old 05-12-2011, 04:18 PM
rcjwp rcjwp is offline
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Default Re: Loud Pinging/rattleing noise when under heavy acceleration, hills...

Quote:
Originally Posted by FireRanger View Post
What have you done for regular maintenance lately? Plugs? Air filter? Fuel filter?
About 6,000 Miles ago I put in new plugs, and the air filter & fuel filter were replaced 1,000-2,000 miles ago.

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Originally Posted by djfllmn View Post
run some injector cleaner/seafoam through it and hit it with a tune up...that should solve your problem
I ran some injector cleaner in it not too long ago, and It had a tune-up 6,000 miles ago. Does it need another one?
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Old 05-12-2011, 04:24 PM
djfllmn djfllmn is offline
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Default Re: Loud Pinging/rattleing noise when under heavy acceleration, hills...

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Originally Posted by rcjwp View Post
About 6,000 Miles ago I put in new plugs, and the air filter & fuel filter were replaced 1,000-2,000 miles ago.

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I ran some injector cleaner in it not too long ago, and It had a tune-up 6,000 miles ago. Does it need another one?
if you run seafoam through it its always a good idea to put plugs in and change the oil
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Old 05-12-2011, 04:27 PM
Clinton Clinton is offline
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Default Re: Loud Pinging/rattleing noise when under heavy acceleration, hills...

You shouldnt need another tune up. Sometimes its a combinations of things, air filter, bad gas etc. I myself would do the seafoam or try some gas treatment first. Also check your oil level

----------

Quote:
Originally Posted by djfllmn View Post
if you run seafoam through it its always a good idea to put plugs in and change the oil
You dont need to change the plugs after seafoam, just change the oil after you run it for a bit
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Old 05-12-2011, 04:29 PM
djfllmn djfllmn is offline
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Default Re: Loud Pinging/rattleing noise when under heavy acceleration, hills...

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You shouldnt need another tune up. Sometimes its a combinations of things, air filter, bad gas etc. I myself would do the seafoam or try some gas treatment first. Also check your oil level

----------



You dont need to change the plugs after seafoam, just change the oil after you run it for a bit
oh...i was told you should change your plugs after using that stuff
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  #8  
Old 05-12-2011, 04:30 PM
rcjwp rcjwp is offline
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Default Re: Loud Pinging/rattleing noise when under heavy acceleration, hills...

Ill give the seafoam a try. Anything else?

The oil level is right where it needs to be. Ive always had it changed every 3,000 miles.



EDIT: I was told that maybe the engine is running lean?
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Last edited by rcjwp; 05-12-2011 at 04:35 PM.
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Old 05-12-2011, 04:33 PM
Clinton Clinton is offline
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Default Re: Loud Pinging/rattleing noise when under heavy acceleration, hills...

Thats where I would start. Just check all your fluid levels first. Also while you are changing the oil think about switching to a synthetic oil
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Old 05-12-2011, 04:37 PM
rcjwp rcjwp is offline
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Default Re: Loud Pinging/rattleing noise when under heavy acceleration, hills...

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Thats where I would start. Just check all your fluid levels first. Also while you are changing the oil think about switching to a synthetic oil
I use Castrol GTX High mileage. Would I switch to Castrol GTX Synblend?
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Last edited by rcjwp; 05-12-2011 at 04:43 PM.
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  #11  
Old 05-12-2011, 04:47 PM
FireRanger FireRanger is offline
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Default Re: Loud Pinging/rattleing noise when under heavy acceleration, hills...

Backup. What plugs did you put in it?
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  #12  
Old 05-12-2011, 04:51 PM
rcjwp rcjwp is offline
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Default Re: Loud Pinging/rattleing noise when under heavy acceleration, hills...

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Originally Posted by FireRanger View Post
Backup. What plugs did you put in it?
It was plugs from o'rileys, not sure.
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Old 05-12-2011, 04:53 PM
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Default Re: Loud Pinging/rattleing noise when under heavy acceleration, hills...

Well that doesn't help. If they are anything but Autolite or Motorcraft brand plugs, that is probably why it isn't working right.
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  #14  
Old 05-12-2011, 05:03 PM
rcjwp rcjwp is offline
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Default Re: Loud Pinging/rattleing noise when under heavy acceleration, hills...

Quote:
Originally Posted by FireRanger View Post
Well that doesn't help. If they are anything but Autolite or Motorcraft brand plugs, that is probably why it isn't working right.
I found one of the spark plug boxes, they are AUTOLITE.
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  #15  
Old 05-12-2011, 07:49 PM
Badmotorfinger1 Badmotorfinger1 is offline
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Default Re: Loud Pinging/rattleing noise when under heavy acceleration, hills...

Fill the tank up with gas from a station that does a good volume of business and pour in two bottles of Chevron Fuel System Cleaner.
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