So I've had my Libby for a half year and I Love it! Been a long time reader, First time poster. Its a '06 with 96K now and I think that I made a great decision, the only mod so far is a EHM and a cleaning the MAP! More to come this summer (timing crap and GDE) when I can drive the '67 Mustang or '55 F-250 and have time to work on it!

But it looks like all the work wont wait till summer! One thing at a time I guess, Last night I left the office and had little power, only at high RPM and have LAG, went home 10 miles, and then drove to parts store 16 miles away to get it scanned, when I was almost to the store, it started running Fine. I had these codes in this order show up P1252, P0299, P1250, P1252, and p0299 they cleared them and I went home no problem. I go to work this morning, no power again and CEL light on again. After exhausting this site it looks like its the Solenoid for the Vacuum line to the Turbo. My question is, there a way to "test" it with a multimeter to check to see if its "bad" to make sure its not a bad wire somewhere inside the harness. before I buy a new one. GDE in this post suggests to simply by-pass it till you can get a new one... viewtopic.php?f=5&t=45413&hilit=test+solenoid I tried it, and got all my power back, but it sounded like it was sucking back the vacuum through that little filter by the solenoid when I turned it off is this trouble?

On Number 15 on this page, I have ~24PSI vac into it and 0 PSI out.(with a gauge no finger) http://www.trademotion.com/partlocator/ ... atalogid=0

So since this is my only vehicle I would take out with salt on the road, do I bypass it till I get the part and not worry about the vac at shutdown or just drive it with reduced power? I don't want to hurt anything as its my Daily Driver.

Thanks! Sorry for the lengthy first post! You guys are great!

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2006 CRD, 111K, EHM, GDE Eco Tune, BF-Goodrich AT/KO, new alternator.....

The on/off vacuum solenoid that failed is designed to prevent the vacuum from leaking down after shutting the vehicle off. It is supposed to keep the reservoir under vacuum overnight so you have good vacuum supply to power the turbo during the first 15 seconds after a cold start. This helps the vehicle response during the first acceleration.

Since you by-passed it, the vacuum will leak down in your KJ after shutdown and the next morning after starting there will be no vacuum in the system. On a cold day it will take 15-20 seconds to resupply the vacuum, so you may just want to idle it a bit to let the vacuum build up to power the turbo and brake booster.

We added an idle bump with the tunes during the cold starts to raise the engine rpm above 1000 for a short time period in an effort to get the vacuum pump to seal and supply vacuum faster right after a cold start.

The on/off solenoid is not a very important component and the vehicle will work just fine without it
(if you by-pass the solenoid), but you just need to be aware of the cold start vacuum supply. The part is reasonably priced if you order a new one.

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