Last post on Apr 08, 2013 at 2:23 PM
You are in the Jeep Liberty and Jeep Liberty Diesel
What is this discussion about?
Jeep Liberty, Diesel, SUV
#127 of 154 Re: Black Smoke [iee1mk]
Oct 06, 2011 (4:25 pm)
Dear Black Smoke
I guess you should check the vacuum solenoid valve to see if it burned out.
It is located on the passenger side back of the engine compartment and has small and medium vacuum hoses connected to it as well and a two terminal control wire. I you were to unplug the valve and test it (across the plug prongs in the wire socket, not the wire) with an ohm meter, the switch should read 29 - 30 ohms. If you get 0 Ohms it is burn't out.
The significance of this valve is that it controls the wastegate of the turbo. If it is burn't out you get almost no boost from the turbo (which can cause black smoke and loss of power).
The next most common cause of the smoke is the hose being split from the turbo to the inter-cooler or the other hose split from the inter-cooler to the intake. Check them or have them checked (generous amounts of oily soot if broken). These hoses are ~$50 each. Depends how where you buy them. Should be replaced with OEM parts or reinforced hose composed of silacone.
Finally, black smoke can be caused by a stuck EGR vale. This can be un-stuck by dis-connecting the wire from the MAF sensor (located on top of the air cleaner / air filter box ). Pull/sideout the red tab and jiggle plug left/right while pulling straight out. Drive vehicle after warm for about ten to fifteen miles with some accelerations. If smoke goes away then it is a bad/stuck EGR valve. This is the cheapest fix (un-plugging) but it does turn on a CEL and DTC. If this is the problem, a SERG device (simulated E G R device) can be found on Internet sites. Purchase one SEGR and install it. It replaces the signals generated by the EGR valve and leave the EGR Valve in the open (non functioning position) which actually does no harm to the engine or emissions (!#$ the EPA). SEGR is about $249 and replacing an EGR Valve is about $750 with labor.
Some people have replace EGR Valve several times because of horrible fuel or the crankcase being over filled with cheap oil. Crud migrates to the EGR Valve. Leaving the EGR Value open and letting crud burn in the catalytic converter does work very well.
Luck with the findings/fixes
#128 of 154 Re: Black Smoke [CRD_Bullydog]
Nov 23, 2011 (12:30 pm)
Sorry it took so long to get back to you. One of the booster hoses was very sooty and oily, so I replaced both with silicone hoses. That didn't help, so I finally took it to my dealer. They replaced the EGR valve and that took care of the problem. However, I did try to running without the MAF sensor before taking it in and it continued to blow black smoke. So when they said it needed an EGR valve I was a bit leery, but as usual they were right. Although I live in a city, I take it back to the small town dealer where I bought it. They sell and service a lot of diesel trucks to farmers and such, so they understand the CRDs and have so far been 100% correct on every recommendation.
Thanks much for your help.
Dec 31, 2011 (5:32 pm)
Back about entry #110, I noted that the yellow light comes on indicating a bad EGR valve. It's been fairly warm so far this Winter Season. We had one patch of cold weather. At that time i had to let the Jeep sit overnight in the cold. It started OK, but sure enough - there was the yellow light. I didn't get to checking it for a few days. In that time, the weather had warmed up. I looked down and the yellow light was out.
Below zero weather may "fool" the computer into thinking it has a bad EGR valve. I expect I'll get it a few more times before the Winter is out.
Happy New Year!
#130 of 154 Cold Weather Again
Nov 25, 2012 (10:45 am)
A year has almost rolled by. I've been plugging my Jeep in every night and not getting the P0401 code for the EGR solenoid valve. I was visiting family for Thanksgiving a few days ago. My Jeep was not plugged in. Sure enough, the yellow check engine light is there and I'm quite sure I'll see the P0401 code when I plug in the computer. I found a fairly good explanation as to how this thing works on the Lost Jeep forum. Hopefully, I can figure out how to disable it without the yellow light being on. The Jeep is now out of warranty since it is over 7 years and 70,000 miles since I bought it. Brief reading on the Lost Jeep forum says that current is sensed to the solenoid. Maybe, it's simple enough to fool the computer with a resistor, but probably not. If anyone knows please let me know. I check here from time to time,.......AND,.......if I find out an explanation of what to do shall be written in clear English.
Jan 29, 2013 (3:31 pm)
I have a P0401 - EGR valcve, P01250 - a solenoid valve and P0299, loss of power. I checked the solenoid valve with an ohmmeter. It is fine. I've had it with the EGR when my finances improve, I am dumping this vehicle. It was poorly designed. I've kept this lemon since 2005. Time to dump her.
#133 of 154 Re: Codes [willysjeep]
Jan 29, 2013 (3:54 pm)
All i did was unplug sensor which turns
It on and off on air cleaner horn
This disables it
I also took breather from
Top of sir cleaner that feeds turbo do it gets
Nice dirty oil!
I ran to the ground
Mpg up 2+
#134 of 154 Re: Codes [turbodude]
Feb 24, 2013 (10:13 am)
Disabling the temperature sensor on the air cleaner may defeat the EGR, but does the check engine light still come on when you do this. I guess it's easy enough to try.
"I also took breather from
Top of sir cleaner that feeds turbo do it gets
Nice dirty oil!"
This was written like a real mechanic. I'll need to study the turbo hosing to fully understand this statement. I'm not sure if "turbo do" is an acronym for something or if something is to to be done, i.e. "do"
Feb 24, 2013 (10:33 am)
Yes check engine light will be on
You can either put a piece of tape if it bothers
You or send wcmmout for reprogram
I used to be a mechanic and own several
I ran hose all the way down and curved
Just replaced old ceramic GLO plugs
With new style metal
#136 of 154 Re: EGR [turbodude]
Feb 25, 2013 (12:09 pm)
I had to have the glow plugs replaced too. I should reroute the hose to reroute the gunk.
It's a dumb design when you have to modify the car not for performance enhancement, but just so that it runs right.