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  #1  
Old 09-09-2011, 09:51 AM
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Join Date: Sep 2011
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Default Engine Knock

Hello everyone, I need some help. I have a 1996 Ranger with the 3.0 w/ auto trans. It started making a knocking sound a couple weeks ago but it would only do it when accelerating from a stop, now it has started doing it constantly. I pulled the spark plugs last night and they were toast (the driver side was worse than the passenger side) so I put in a new set but it didn't stop the knock. I'm thinking it may be a timing issue but I just don't know. I had the codes checked and the only one that came up was a bad purge valve but I don't think that should have anything to do with this. If I had to describe the sound, I would say it sounds like something metal hitting the fire wall. It won't knock at an idle or in park, only under load. I've tried checking for any vacuum leaks with carb cleaner, found one small one and repaired it with a new hose.

Our other car is currently broke down so we are currently without a vehicle and don't have the money to take it to a mechanic so any help is highly appreciated.
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  #2  
Old 09-09-2011, 10:10 AM
Republican
 
Join Date: Mar 2011
Posts: 336
Default Re: Engine Knock

Put someone in the driver seat and rev it up while you locate the general vicinity of where the sound is coming from. Could by rocker arm or lifters.....
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  #3  
Old 09-09-2011, 10:45 AM
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Default Re: Engine Knock

It won't make the noise in park, it needs to be under load. Like wise if I'm driving and it starts knocking, I can take my foot off the gas and it will immediately stop.
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  #4  
Old 09-09-2011, 10:58 AM
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Join Date: Mar 2011
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Default Re: Engine Knock

So if you put it in neutral and give it gas, it will not make the sound...it has to be in gear moving?
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  #5  
Old 09-09-2011, 11:13 AM
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Default Re: Engine Knock

Quote:
Originally Posted by webster426 View Post
So if you put it in neutral and give it gas, it will not make the sound...it has to be in gear moving?
Correct, I can gas it in park and it won't do it. The fact that it destroyed the spark plugs makes me think something is wrong with the timing. The weird part is that the plugs were a nice brown color but the center electrode on some of them were completed gone all the way down to the insulator.
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  #6  
Old 09-09-2011, 12:02 PM
Psycho Pete
 
Join Date: Jun 2009
Posts: 1,487
Default Re: Engine Knock

Try some really high octane fuel; if it goes away then what you are hearing is pinging. Pinging generally is not good at all. Seems to be a somewhat common problem people are trying to solve with this particular engine.

Edit:
Just read your last post, those cylinders sound like they are running too lean.
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1988 Ford Ranger Long Bed Parts Truck
1993 Ford Tempo 2.3L OHV HSC Auto - D/D Stock.
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2002 Dodge Caravan - 3.3L Auto

Last edited by Psychopete; 09-09-2011 at 12:05 PM.
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  #7  
Old 09-09-2011, 12:19 PM
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Default Re: Engine Knock

I actually tried some 93 octane with some octane boost and it seemed to help a little, then it got a lot worse. The sound is similar to the video below but the knock is not constant. I just want to emphasize that this is not my video and I am only referencing it for the tone of the knock.

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