Stuck at 14.2 psi of boost - Chevy and GMC Duramax Diesel Forum
04.5-05 LLY Duramax Powertrain Discussion of components that are directly involved in the power production and all that is needed to get and keep the truck moving . Engine , Transmission, Etc.

 
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post #1 of 4 (permalink) Old 01-25-2020, 01:55 PM Thread Starter
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Stuck at 14.2 psi of boost

I just finished up my head gasket job and got it running. Me problem is when I took it for a drive it will smoke way more than before, specifically at low rpm. Iím looking through everything with a scan gauge and everything looks good except the boost pressure is holding at 14.2 psi. It doesnít change at all unless I unplug the map sensor then it drops to 4 psi (so shouldnít be the wiring?). I know the whole atmospheric pressure is ~14psi thing but it doesnít change at all if I take off, idle, power brake, shut it off. I definitely donít have a boost leak big enough to this ether as it has way more power than if it wasnít getting boost at all. Should I just say f*** it and put a new map sensor on or is there something I might be missing?

Also, are the two ďmapĒ sensors the same? I might try switching them and see if anything changes.


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post #2 of 4 (permalink) Old 01-25-2020, 03:47 PM Thread Starter
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Update after messing around all afternoon. First off I am now up to speed that the two sensors are different. The did change when I switched them though so another point for it not being a wiring problem. I tried cleaning the map and tried it again and now itís reading 12.7 at idle and when I get on it it drops. Canít say I understand that one but unless anyone chimes in Iíll probably just go ahead and get a map sensor tomorrow. Which are apparently pretty pricey compared to normal maps, go figure


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post #3 of 4 (permalink) Old 01-26-2020, 01:24 PM Thread Starter
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Next update. New MAP sensor, still have smoke and it reads 14.0 psi at idle and will climb to close to 15 if I power brake a little. Any ideas? Iím about to drive this shit box into a lake.


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post #4 of 4 (permalink) Old 01-26-2020, 02:24 PM Thread Starter
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Well after a drive I think the map sensor problem is fixed but itís still over fueling. So Iím going to start a new thread to go with evidently a different problem


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