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Old Jun 10, 2006 | 07:12 PM
  #1  
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factory594x4
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78 f-250

I can't get my truck to stop pinging, or maybe it's marbleing. I'm not sure of the difference.
 
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Old Jun 10, 2006 | 07:32 PM
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well if its pinging could try higher octane fuel, not sure what your currently running
 
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Old Jun 10, 2006 | 07:37 PM
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all different grades of fuel, but no real change.
 
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Old Jun 10, 2006 | 07:52 PM
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Check your timing. You might need to back it off a little. What is marbleing?
 
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Old Jun 10, 2006 | 08:53 PM
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More info ?

Mileage on engine
Timing setting
Condition of Distributor
Altitude you're driving in compared to the location when the setting of the timing took place.
Using Fresh Gasoline

Enquiring minds want to know
??????
 
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Old Jun 10, 2006 | 08:59 PM
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Threads merged, please do not cross post.

Fix your EGR or adjust the distributor???
 
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Old Jun 10, 2006 | 09:49 PM
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I dont' know the mileage. The odometer reads 60k(160k,260k,360k I don't know ,but not much oil pressure) I put on new heads and an edlebrock performer intake when I got it(looked like the o.g block, there wasn't too big of a ridge). I can't see the timing marks due to all the pullys and belts in the way. I've timed it with a vac gauge. Dist seems to be in good order. Driving at sea level. Always fresh fuel. Pings @2200-on when throttle is pressed or under load/up hills.
 
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Old Jun 10, 2006 | 11:33 PM
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roger dowty
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last ridge i thought was ok led to a 040 bore to clean it up....it was a bummer.

Like others said...ck the timing- has it been doing it since the head swap? when does it ping most (rpm)...I'm also interseted as what marbeling is...

Some good folks advocate using a hv oil pump on high mileage 400's to help them last longer.
 
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Old Jun 11, 2006 | 01:04 AM
  #9  
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a vacuum gauge is not a timing light. what is the correct vacuum reading? i smell my shorts to see how fast i'm going but i keep getting speeding tickets. ???
 
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Old Jun 11, 2006 | 02:04 AM
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In order to get a light in there I will have to pull the belt off the air pump and take off the pully so I can see the marks. Will this alter timing??
 
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Old Jun 11, 2006 | 07:22 AM
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I timed mine with a vacuum gauge to see how close I could get it in time without a light. After I did I checked it with a light and found I had set it at 26 deg advance.
 
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Old Jun 11, 2006 | 12:46 PM
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removing the pulley would not effect the timing that i'm aware of, but i'll bet there's an easier way. i wonder if you'd be able to see the marks better in the dark? you don't have to have the light at point blank range, the light will reflect off all the surfaces and light up the marks if you can even see them at all with the pulley on? like Towtruck says, setting timing for best vacuum is going to be extremely advanced, guaranteed to ping and eventually do damage to the engine.
 
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Old Jun 11, 2006 | 01:41 PM
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I'm betting your timing is too far advanced. If you can crawl under your truck you should be able to find the timing marks pretty good. On my F-350, I ended up bumping the engine over and crawling under there so I could find the timing marks. I used some "white-out", and marked my damper on the mark I wanted to time it to. When I start the engine and set the timing, I can see that white line really easy, it's just a matter of lining up the pointer to my white line, real easy. If you can see your pointer from up top, you should be able to set the timing pretty easy. The timing light doesn't have to be real close. Good luck.
 
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Old Jun 11, 2006 | 03:13 PM
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So what should I set the timing at? I know it is different than stock due to the performer intake. Is there any difference in timing of 4bbl vs 2bbl? If so what?

Thanks
 
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