Ran fine one day, next day it didn't

synthetic-oil · **Joined:** Tue Sep 24, 2013 8:03 pm **Posts:** 142

LJ search function just doesn't like me. I know this has been brought up before but everything I search for I get the search didn't find anything. s I topic says it ran fine one day and the next loss of power, rolling coal. Before I got it home got the under boost code. Pulled the MAP (IAT) sensor and it was just a glob of goo on it. Tried cleaning. Put a new one in today. No codes but lack of power and still rolling coal. Check the vacuum readings, ok. Check to see it turbo actuator is working, it is. Air filter is only a few months old. maybe 1k miles on it. What do I check next? Thanks

WWDiesel · **Posted:** Sun Jun 13, 2021 12:06 am

Things that come to mind:
Does it still have EGR in operation?
If so, the EGR valve could be stuck open and loosing boost backwards through it.

Have you checked your boost hoses real good for any leaks, tears, etc...where you could be loosing boost.
On the MAP sensor, pull it back off and run a piece of heavy wire down in the sensor's hole on top of the intake and make sure the inside of the intake has not bridged over with goo to where the new MAP senor cannot get a proper reading.
Check the air suction boot/pipe between the air box and the turbo inlet and make sure it has not collapsed or come apart and is stopping up air flow going into the turbo inlet.

Report back :wink:

Hint: To search LOSTJeeps, plug the following in your browser's address bar:
"addtexthere" site:www.lostjeeps.com/forum/
Change the addtexthere in-between the quotation marks to whatever subject you are looking for and hit enter.
It Works!

synthetic-oil · **Joined:** Tue Sep 24, 2013 8:03 pm **Posts:** 142

Cleaned out the IAT port. I'm running the ERG delete from Yeti. Runs fine at low speeds. On hwy slow to accelerate. MAP is 16 -17 psi.

thesameguy · **Joined:** Sat Oct 01, 2016 8:24 pm **Posts:** 652

Can you tie the performance issue to engine speed versus road speed? What you describe sort of sounds like a clogged cat.

TKB4 · **Posted:** Wed Jun 16, 2021 9:37 am

synthetic
If you want to search further for this or other issues there have been threads about other ways to do this WW had good input on those threads. I just use my regular search engine like google and then add lost jeeps at the end .

synthetic-oil · **Joined:** Tue Sep 24, 2013 8:03 pm **Posts:** 142

Problem found. :BANANA:

Bought everything to build test plugs for the intercooler hoses on Tuesday so I thought. I forgot one fitting and tor up the shop looking for it or someway to rig something. So yesterday was another trip to Homedepot for a 1.69 pipe nipple, I bought two. The hose from the intercooler outlet hose has a split in it under the covering.

WWDiesel · **Posted:** Thu Jun 17, 2021 11:56 am

synthetic-oil wrote:

Problem found. :BANANA:

Bought everything to build test plugs for the intercooler hoses on Tuesday so I thought. I forgot one fitting and tor up the shop looking for it or someway to rig something. So yesterday was another trip to Homedepot for a 1.69 pipe nipple, I bought two. The hose from the intercooler outlet hose has a split in it under the covering.

Great!

Just curious, how much pressure did you put on the system? :POPCORN:

synthetic-oil · **Joined:** Tue Sep 24, 2013 8:03 pm **Posts:** 142

It was so bad that it wouldn't build pressure. I set the regulator on the compressor to 20 psi. I have a valve that I can slowly bring up the pressure.

Ran fine one day, next day it didn't

Who is online