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Jeep Liberty Diesel

10699 messages,  Last post on Dec 05, 2009 at 4:11 PM

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What is this discussion about? Jeep Liberty, Biodiesel, Diesel, SUV

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#10551 of 10699 Re: Got a new EGR valve today [winter2] by firemedic44 Aug 22, 2009 (7:22 am)
Replying to: winter2 (Aug 21, 2009 4:58 pm) Thanks for the reply Winter.   My daughter takes it to collage about a 3-4 hour ride. I will have her clean it out on the highway.    I'm not sure about the Tech cleaning the passages. If Jeep has it in the directions for replacing the EGR valve then he does, if not, then I don't know.   The boost sensor have never been cleaned. Maybe the Tech has. He has mentioned that the pencil valves has a plastic coating that most spray cleaners will damage.    You mention driving habits. We have babied the CRD since most post here say if you keep the speed around 57-60 you should get the best mileage and the RPM's should not exceed 2500.   Did you find a manual that has these maintenance procedures? The cleaning of the boost sensor sounds easy but I'm not sure where to start,   The additives you mentioned. You are using 2. What do they do. I'm in the Chicago area and in the winter when we have days -0 it has been a problem running. I use BP and thats the best I can do here. Would one of these help with that issue?   Sorry for the long response. Replies to this message: winter2 (Aug 26, 2009 8:01 am)
#10552 of 10699 Re: Got a new EGR valve today [firemedic44] by winter2 Aug 26, 2009 (8:01 am)
Replying to: firemedic44 (Aug 22, 2009 7:22 am) 1. Babying your CRD is good to a point, but the engine needs to be flogged from time to time. The nose blowing consists of having a thoroughly warmed up engine. Find a quiet long straight a way. Shut off the overdrive. Put he metal to the metal (from a dead stop) and hold the gas to the floor until you reach 65 MPH. Repeat until you are not getting wads of black smoke coming out of the exhaust. Do at least twice weekly.   2. As you live in Chicago, cold is a problem. The wire for the block heater should be attached to the oil dipstick. I usually plug in if the temp falls below 15 degrees F. Plug your CRD in. It makes a big difference.   3. Cleaning the boost sensor is real easy. Caribou2 posted a picture or two in this forum. You will need a 4mm hex/Allen key wrench and make sure the engine is cold. The solvents that can be used are brake cleaner, Castle Shop Solv, or Power Foam from Amsoil. I clean it every 5000 miles and have nearly 55K on my CRD.   4. As I mentioned, domestic diesel fuel is swill, it sucks. Both of the additives I use have cetane improvers which will help starting and improve fuel economy and power.
#10553 of 10699 A lumpy engine by fred_blogs Aug 27, 2009 (1:33 pm)
I have a 2002 Cherokee (Liberty) and I have 2 issues with it. Firstly, the engine is lumpy. What I mean by that is that it sounds as if it is running on 3 pistons, performance is OK but has seen better days. Any ideas? It has recently had a set of reconditioned injectors fitted.   The second issue is with the air-con. I have had it re-gassed twice this week but it still doesn't work. That is not strictly true, as it works when I leave the garage but then gives up the ghost the next time I start the engine. Again, any suggestions gratefully received. Replies to this message: mdamick (Aug 30, 2009 4:56 pm)
#10554 of 10699 Re: A lumpy engine [fred_blogs] by mdamick Aug 30, 2009 (4:56 pm)
Replying to: fred_blogs (Aug 27, 2009 1:33 pm) I would check the injector plugs, one might not be tight, or you got a dud.   As to the A/C, you have a pretty good leak. Some dye should be put in to find the source. On mine, the condenser nuts were not quite tight enough and that is where mine leaked, but not as fast as yours.
#10555 of 10699 Re: Liberty Diesel (CRD) 06 [kesh25] by jptech75 Sep 04, 2009 (8:56 pm)
Replying to: kesh25 (May 30, 2009 2:14 pm) P0401 & P0229 could have been triggered by a false Mass Air Flow reading. Test the MAF first. Then verify there are no leaks in the intercooler hoses. Pay special attention to the hose on the Driver's side that attaches to the throttle body. I have seen many rupture near the frame rail. When was the last time the boost/air temp sensor was cleaned?
#10556 of 10699 Thanks by fred_blogs Sep 05, 2009 (8:44 am)
Thanks very much for your replies. I am taking it in to the garage on Monday as I don't have the equipment to check it. I will be cautious about what they say thanks to your posts. Fore warned is fore armed!
#10557 of 10699 Re: Got a new EGR valve today [firemedic44] by jr101 Sep 06, 2009 (10:10 am)
Replying to: firemedic44 (Aug 21, 2009 2:16 pm) Yesterday I just got my 4th egr valve in 8 months..have about 70k on it - 2006, plus I've replace all my globe plugs and I've only had the car 2 years - so somethings not right here. I've had no other problems other that this. Replies to this message: gormanp (Sep 06, 2009 11:04 am) ranrover1 (Sep 07, 2009 4:27 pm) wvav8tor (Sep 06, 2009 6:05 pm)
#10558 of 10699 Re: Got a new EGR valve today [jr101] by gormanp Sep 06, 2009 (11:04 am)
Replying to: jr101 (Sep 06, 2009 10:10 am) Try cleaning your boost pressure sensor- you can do it yourself with simple tools, or ask a mechanic. It gets clogged with soot from the diesel, and this leads to performance problems. Much cheaper than EGRs, etc. Replies to this message: ranrover1 (Sep 07, 2009 4:27 pm)
#10559 of 10699 Re: Got a new EGR valve today [jr101] by wvav8tor Sep 06, 2009 (6:05 pm)
Replying to: jr101 (Sep 06, 2009 10:10 am) Pull the plug on the egr, I did and I have had over 20,000 miles of service free miles. I just returned from the beach where I got over 31 MPG, set the electrionc fuel indicater and did not touch it until I returned home. Also towed a Ford Model A home on a Uhaul car transport trailer from Cooksville Tn. back home to WV, Trailer and car weighed over 4400# and I still got 20.5! Jeep now has 44000 miles and the only thing done was one glow plug...guess I got a good one:-)   Disconnect the EGR and do the EHP and many of the problem will dissappear or at least they did for me.
#10560 of 10699 Re: Got a new EGR valve today [gormanp] by ranrover1 Sep 07, 2009 (4:27 pm)
Replying to: gormanp (Sep 06, 2009 11:04 am) Hi and thank you for any and all help   Where is the location of the boost pressure sensor. I have already cleaned the map sensor which was clogged up but the vehicle still give me a code (P0299). I've also taken out the EGR valve and cleaned that up as well. I still get the same code. The only thing I have not done is the boost pressure sensor because I don't know the location. If you can think of anythig else please let me know. One last thing is there any way to test the electrical part of the EGR valve?

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