VERY Loud Intake Popping sound and more coal!! Help!!! - Diesel Forum - TheDieselStop.com
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7.3L IDI Diesels (Not Power Strokes) Technical discussion of topics related to vehicles powered by the 7.3 Liter In-Direct Injection Navistar engines.

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Old 07-04-2012, 04:27 PM   #1 (permalink)
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Exclamation VERY Loud Intake Popping sound and more coal!! Help!!!

i just bought this 1993 f-250 7.3 idi acouple days ago and it ran like a top, today i started it up when and filled up my tank at piolet, then as i was on the way to my friends my truck started to make a lound popping sound so i pulled off the road and found out it was comming out of the intake, after this popping sound started i also noticed that my truck was rolling alot more coal than usaual and i mean alot more!! can some one please help!!

Last edited by shaneI.D.I; 07-04-2012 at 04:30 PM.
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Old 07-04-2012, 04:33 PM   #2 (permalink)
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Sounds like your filter is messsed up or something and not letting the engine get enough air therefore burning less fuel and blowing more smoke. I would check in your filter housing and check filter and either replace or blow out with air

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Old 07-04-2012, 04:40 PM   #3 (permalink)
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i just bought a new filter actually, my problem is still prestent. when the problem first started it did it for awhile then i turned my truck off at my friends and started it again and it still had the popping sound but then it went away for about a minet but then came back!
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Old 07-04-2012, 04:49 PM   #4 (permalink)
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Welcome to the Diesel Stop

If it's popping ( chuffing) through the intake, then your mosy likely issue is an intake valve.

May be a broken valve spring not allowing the valve to close, could be a worn valve guide not allowing the valve to seat correctly, could be a few other things.

If it ran good when you bought it, I would lean more towards a broken valve spring. take the Valve covers off and look real close at all the intake valve springs.
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Old 07-04-2012, 04:54 PM   #5 (permalink)
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thank you very much. i will start doing that now and get back to you how much would a new spring be if its the problem? but my questin is if is valve train related how did it go away for a short time then come back?
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Old 07-04-2012, 05:07 PM   #6 (permalink)
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If I remember right there is a spring inside another spring. It may have broken and rotated. I am not sure how much a spring is, but it can't be that much. And if you have the right tools, you can change it without taking the head off.
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ATS Turbo upgrades: 3" DP with 3" exhaust Magnaflow XL muffler: Pictures Here
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Hypermax Cowl induction, K&N air filter, flex-a-lite 26K trans cooler with fan,Tekonsha prodigy
Train Horns: Pictures here

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Old 07-04-2012, 05:08 PM   #7 (permalink)
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Maybe your cdr valve is stuck open and your sucking oil through it and it pre igniting one time I sprayed too much clp in my intake manifold and it made a poping sound but it was more off a woof also could have a few injectors stuck open. Do you run a additive if not you should for a deep clean I used seafoam but have just recently found that that's not good I've had used diesel fuel catalyst by redline mixed 1/2 tank to a full bottle and I use power service +cetane boost wich I belive maintains injectors and it adds vital lubricant to the fuel that was taken out and the big bottle treats 250 gal and it does improve mpg in my tdi if I had a optical timing light I'm willing to bet I can improve mpg alot
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Old 07-04-2012, 05:18 PM   #8 (permalink)
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i did put some Diesel Kleeni Cetane boost in to see if it would help but it did not. where is the cdr valve located and how do you check if it is stuck open? sorry im some what new to the diesel world!
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Old 07-04-2012, 05:19 PM   #9 (permalink)
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Quote:
Maybe your cdr valve is stuck open and your sucking oil through it and it pre igniting
If the CDR were stuck open and it was sucking enough oil to ignite, then he would probably suffer a run-a-way condition.

Quote:
I used seafoam but have just recently found that that's not good
Used properly it works real good. I used it to fix my advance solenoid in my IP. I do use P/S Diesel Kleen with each fill up. I don't know if it makes a difference but it make me feel better.

NOT picking on you, but I seriously doubt the CDR is causing any of his issues. Lack of compression will cause black smoke due to incomplete burn of the fuel, just like an overfueling issue.

SHANE: If you don't find any broken springs, then I would do a cylinder leakdown test. Air from the intake is a good indicator of intake valve problem, air from tailpipe is a good indicator of exhaust valve problem, air from the oil fill is a good indicator of piston ring problem.
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ATS Turbo upgrades: 3" DP with 3" exhaust Magnaflow XL muffler: Pictures Here
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Hypermax Cowl induction, K&N air filter, flex-a-lite 26K trans cooler with fan,Tekonsha prodigy
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Old 07-04-2012, 05:25 PM   #10 (permalink)
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oak thanks im traillering it to my friends house tonight where he has a pull barn. ill pull the vaulve covers off and look at the intake springs and get back to you. i also did notice the sound is alot quieter when engine is cold but as it warms up it gets louder..!
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Old 07-04-2012, 06:05 PM   #11 (permalink)
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i just cracked open the first injector on the right side and it cut the sound in half? what do you think?
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Old 07-04-2012, 06:14 PM   #12 (permalink)
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You probably have a broken exhaust pushrod or rocker arm.
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Old 07-04-2012, 06:27 PM   #13 (permalink)
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thanks for again for the pointers! i will look at that tonight and get back to you all!
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Old 07-04-2012, 10:16 PM   #14 (permalink)
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just started it at my friends house and it ran like it was brand new! after about 25min of idleing it came back! should i still pull the valve covers and look at the springs?
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Old 07-04-2012, 11:53 PM   #15 (permalink)
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I will admit that I am puzzled right now. If you loosened a line and the noise eased, and now it ran good for a bit then came back, try running it til the noise comes back and then see if the noise eases again with loss ending the same fuel line.


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ATS Turbo upgrades: 3" DP with 3" exhaust Magnaflow XL muffler: Pictures Here
2012 Copper Canyon 273 FWRET w/2 slides, Air Lift 5000 bags
Pillar pod: Autometer C2 Series gauges: pyro,trans, boost, water, oil pressure
Hypermax Cowl induction, K&N air filter, flex-a-lite 26K trans cooler with fan,Tekonsha prodigy
Train Horns: Pictures here

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