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Old 12-05-2010, 05:01 PM
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Boost issue?

So a couple of weeks ago i was seeing 20psi of boost now i am only seeing 15psi. I don't know if i have a chip i still haven't had a chance to check and from what i've read on here i wouldn't see over 15-17psi of boost if i didn't. What could be the issue? Truck seems like it is running the same.
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Old 12-05-2010, 05:03 PM
If it aint a CAT itsa DOG

 

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Check the pcm cover to see if there is a chip in the pcm. Sometimes there is a hole cut in the cover. You might have a boost leak at a CAC tube boot. They are prone to cracking. Also did you ever figure out your heat issue?
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Old 12-05-2010, 05:24 PM
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Haven't figured out the heater issue cause it hasn't done it again. I hate problems that appear and then go away.

How do i check for a leak at the CAC tube boot?
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Old 12-05-2010, 05:26 PM
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damn weather, double post

Last edited by Wildfire532FB; 12-05-2010 at 05:31 PM.
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Old 12-05-2010, 05:31 PM
If it aint a CAT itsa DOG

 

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Just check all the clamps and boots really good, including the orange ones under the intake. I have had the blue boot on top of the drivers side valve cover crack on both of my 7.3s. The oem boots are not oil resistant and there is always some oil in the charge air cooling (CAC) system from the crank case breather. I would start with those things first.
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Old 12-05-2010, 05:42 PM
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OK thanks man. I hope its nothing and my guage was just reading wrong or something. I love this truck but ever since i got it i've just been dropping the money into it.
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Old 12-05-2010, 05:47 PM
If it aint a CAT itsa DOG

 

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sometimes that happens with used trucks. I have kinda been doing the same thing to mine, but they don't make em like the 7.3's anymore and its usually cheaper than a new truck payment. If it is a boot its not hard to change nor are they really expensive so just start there. Also check the line running to your boost gauge.
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Old 12-05-2010, 06:34 PM
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Yeah that was the first thing i checked tonight was the line, it could be the back of the gauge
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Old 12-05-2010, 09:20 PM
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Would i make more boost under a different load? Like going up a hill? The only time i can actually remember seeing 20 on my gauge i was going up hill getting on the freeway.
and my dad said he saw it after picking up my truck from the shop after i got the up pipes fixed.

Last edited by Wildfire532FB; 12-05-2010 at 09:26 PM.
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Old 12-06-2010, 02:30 AM
If it aint a CAT itsa DOG

 

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Usually the harder the engine is working the more boost you will pull. So if that was the only time you saw 20 and are still getting 15 then maybe everything is ok. Go make it work a little harder and see what she gets to again.
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