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| lost boost, what happened? http://www.lostjeeps.com/forum/phpBB3/viewtopic.php?f=5&t=79618 |
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| Author: | GliderGuy [ Mon Jul 14, 2014 7:11 pm ] |
| Post subject: | lost boost, what happened? |
05 CRD Limited 125k miles, new to me this spring, TB replaced last month. Today, driving north of Reno, 100+ degrees, I took off to merge with traffic on a long hill, all of a sudden performance died. I got up the hill by gearing down, hooked up my OBD2 unit, and looked at the boost. (BTW, this is at about 5k elevation). Where i would expect it to power up the hill with 15PSI boost, I was seeing 5 or less. Headed on home like that, and had to make a brief stop at Home Depot to buy a new air conditioner (did I mention that it's hot here). Came out and expected it to get me home with minimal power, as I thought maybe it had blown a boost hose. I was surprised that it had returned to its normal excellent performance. Any idea what happened? I didn't check to see if it has thrown any new codes, but I am running ORM. No tune (yet). |
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| Author: | AZ CRD [ Mon Jul 14, 2014 7:50 pm ] |
| Post subject: | Re: lost boost, what happened? |
My guess would be air in the fuel system. This sort of thing has only happened to me once since I installed the in-tank lift pump five years ago. It happened at 7,500ft on a hot summer day. |
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| Author: | WWDiesel [ Mon Jul 14, 2014 9:15 pm ] |
| Post subject: | Re: lost boost, what happened? |
Sounds like it went into limp mode due to fuel starvation; consider adding a lift pump in the tank as some of us have done to solve this problem. (been there done that) In the mean time, if it does it again; pull over, stop the engine, and pump up the fuel head and then restart and see if the problem disappears. If it does, you have diagnosed your problem....  
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| Author: | ATXKJ [ Mon Jul 14, 2014 9:57 pm ] |
| Post subject: | Re: lost boost, what happened? |
before you add the lift pump....did you change the fuel filter? they can get clogged - and as noted fuel issues seldom throw codes - just go into limp mode (commonly clears when you turn it off/on) |
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| Author: | GliderGuy [ Tue Jul 15, 2014 12:47 am ] |
| Post subject: | Re: lost boost, what happened? |
I think you guys have hit on the problem, thanks. Yes, I changed the filter, along with pretty much everything else in the noob guide. I was hot and frustrated this afternoon and didn't think of that. I guess that I could diagnose it a bit by bleeding it again and seeing if there is any air. Ed |
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| Author: | CATCRD [ Tue Jul 15, 2014 9:32 pm ] |
| Post subject: | Re: lost boost, what happened? |
Sounds just like a filter on the verge of being blocked. Fuel makes boost, they say. You only notice it under high demand. Then after a restart you can drive away. |
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| Author: | GliderGuy [ Wed Jul 16, 2014 7:45 pm ] |
| Post subject: | Re: lost boost, what happened? |
I doubt it's that. Fuel filter was changed in the last 1k miles. |
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