2006 CRD low boost code

Thylandjr · **Joined:** Mon Sep 30, 2013 10:36 am **Posts:** 2

Hi All,

I have an odd low boost scenario happening with my CRD. It has 148,000 miles on it and after sitting unused for six weeks in does not boost properly at lower rpms and pulls a low boost code (cant remember it right now) unless you drive full boar everywhere. If you drive like a nut and really romp it it boosts fine at high rpms and you wont get the code. You can hear some turbo noise at lower rpms but it doesn't spool up like it should. I have had the Boost hoses off and inspected them thoroughly and found no tears or holes. I also took it for a ride with the hose off and it wouldn't accelerate at all and the code popped instantly. I think the problem is related to whatever causes the turbo to spool (i.e. waste-gate, variable veins??) and that is where my knowledge falls short on these rigs. No weird noises and like i said it does still spin at low rpm, just not like it should/used to so i don't the the turbo itself has failed. If anyone has had a similar experience and or has any suggestions i'd love to hear them!

Thanks!

Terry

P.S. I already got a suggestion that egr might be stuck open which i am skeptical of, do we agree or is it worth a shot. There has never been an egr code.

papaindigo · **Posted:** Mon Sep 30, 2013 11:22 am

At 148,000 miles I hope the timing belt has been done, if not park it until it's done.

As to low boost:
1. when you had to boost hoses off were they soggy with oil like a wet sponge? If so they can probably leak boost with any visible holes.
2. did you check your air filter box to turbo hose for a tear underneath just in front of the turbo? While there did you check turbo shaft play (tiny bit fore/aft ok barely can be felt side to side ok, more = bad)
3. is the air filter clean?
4. how about the funny little boost air filter hanging off the fender side of the vacuum tower located just behind the air filter box; is it clean?
5. check the boost pressure solenoid - viewtopic.php?f=5&t=70602&p=757348&hilit=boost+solenoid#p757348
6. if the code is P0299 it might be viewtopic.php?f=5&t=61240
7. if the code is P1140 your flow control valve (thing the CAC hose attaches to on the driver's side) plastic gear may have stripped in which case the FCV may be closed or partially closed which would inhibit boost. Simple fix is undo the screws holding the FCV butterfly in place and discard it.
8. gunked up variable vanes. Per GDE "You can check the vane functionality at idle in park. Underneath the vacuum actuator on the turbo is rod extending downward connected to the vane mechanism. If you pull off the vacuum line at the turbo, the arm should drop about 1/2 inch and then raise back up after reconnecting the vacuum line. It is a bit difficult to see the rod, but this is the easiest method to check for proper VGT vane moevment."
9. EGRs can be cleaned if need be rather than replaced but I would try other things first. That said unplugging the MAF will disable the EGR, throws a code while it's unplugged, and if doing so restores your boost that's a hint.

ATXKJ · **Posted:** Mon Sep 30, 2013 7:07 pm

What he said ^^^

also Welcome to LOST and check out the Noob guide
http://www.lostjeeps.com/forum/phpBB3/viewtopic.php?f=5&t=54207
lots of good information

Thylandjr · **Joined:** Mon Sep 30, 2013 10:36 am **Posts:** 2

I want to give out a big thanks for such a detailed reply! Sorry I havnt been back sooner but i have finally gotten under the hood on my CRD and number 8 seems to be the culprit. When i play with the vacuum hoses for the vgt system they are all good, when i disconnnected the line from the diagram per GDE's instructions, the rod on the bottom drops less than a 16th of an inch, and will not move with a small nudge from a screwdriver. So it seems that my veins are clogged up. So the next question is how do i clean them out, preferibly not requiring turbo removal?

Thanks again!

Terry

papaindigo · **Posted:** Sun Oct 13, 2013 1:35 pm

Variable vane cleaning can be accomplished by:
1. an Italian tune-up which should be an occasional part of your routine. Get the engine up to full operating temp and then on a modest uphill slope (equivalent of an Interstate on/off ramp or so) do a full throttle acceleration run ignoring the clouds of black smoke behind you. Repeat a couple of times. If that does it great if not:
2. you may have to do a forum search or query as I've not saved a "how to" but some folks have reported getting access to the vanes (does not require turbo removal I don't think) and using regular old oven cleaner to degunk the vanes.

2006 CRD low boost code

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