The amazing disappearing and reappearing 0299/0401 codes.

fxjr73 · **Joined:** Mon Nov 02, 2009 10:37 pm **Posts:** 16

Hello LOST!

Been a while since I've posted and I know this topic is beaten to death because I've been scouring the forums for days. However...

My check engine light keeps coming on and then turning off. Sometimes it stays off for a couple of days and then comes back on for a couple. Sometimes it turns on and off every few hours and it's always 0299 and 0401.

I replaced the EGR fewer than 10K miles ago. I cleaned the MAF sensor a week ago (it was ridiculously filthy and I hadn't read the Noob guide before). My cleaning of the MAF resulted in accidentally snapping off the top nipple of the plastic fuel return block. So I recreated a new one out of brass plumbing parts and it seems to work fine (just adding that piece of info in case it's somehow relevant and I didn't realize).

I know I need to get the GDE Tune to be done with this, but I've had higher priority items come up that keep pushing that out... Timing belt and water pump replacement a few months ago (it was time), partial rebuild of my rear transaxle a month ago after u-joint failure and new tie rods last week, probably thanks in part to my wonderful E rated tires and Chicago's terrible streets.

Any thoughts on the on again off again 0299 0401 codes?

Thanks!

CATCRD · **Posted:** Thu Mar 21, 2013 10:07 pm

Those two were classic codes for egr system failure back in the day. But they're not always caused by the egr valve itself. Can be caused by the"egr flow control valve" or fcv around here. Its an intake throttle designed to make a pressure differential in the intake to draw in more egr gases.

TJ2 · **Posted:** Thu Mar 21, 2013 11:56 pm

I sincerely do not understand your priorities. You've got a POS lift (built close by where I live) and you do not have a GDE tune.

My 0299 code disappeared when my priorities dictated a tune from Keith.

Of course, YMMV

papaindigo · **Posted:** Fri Mar 22, 2013 9:46 am

Odd that the codes come and go. P0299 can be related to a bad boost pressure solenoid (see viewtopic.php?f=5&t=70602&p=757348&hilit=boost+solenoid#p757348 for how to bypass) or a leaky vacuum line to that tower possible under the coolant tank but that's usually associated with power loss. You could bypass the solenoid and drive that way for a bit to see if the code stays gone. 0401 appears to be EGR related. You might try unplugging the MAF sensor (see picture on Sir Sam's NOOB guide) which will throw a code but disable the EGR. I don't know what code it throws but if it's not the 0401 doing this would be a way to see if 0401 stays gone.

I suspect you cleaned the MAP sensor (back of the engine) not the MAF sensor. If not clean the MAP sensor. Can you post a picture of your brass plumbing block fix? If you don't know how email me a copy and I'll post or PM/email me and I can tell you how to post.

In the long run I suspect a GDE tune will fix both issues.

Hexus · **Posted:** Fri Mar 22, 2013 10:02 am

You are going to continue to get those codes until you replace the FCV valve or clean it (only possible fix, if it's bad it still won't help to clean it).

Just do the ORM and that will disable the EGR/FCV until you can afford the GDE tune, that should also help some with the soot build up on the MAP Sensor. MAF sensor you can clean with some non-chlorinated cleaner or your vacuum.

The bad boost pressure could be interrelated to the EGR/FCV issue as well, but check for leaks and cracks in the plumbing first.

The sooner you can disable that EGR/FCV stuff the better, I'm personally convinced that the EGR and 0w40 oil combination is the primary cause of all the Rocker/Lifter failures, not the timing belts.

A stitch in time saves nine, so to speak.

kjjet · **Posted:** Fri Mar 22, 2013 11:46 am

Agreed... you have a EGR problem. But the biggest problem is the EGR is still slowly killing your engine. You could spend alot of $$ fixing the EGR and then continue to kill your engine. OR you can disable: Few choices:

1. ORM. Disconnect your MAF sensor. Bad part, you get a "CEL" Check engine light on all the time and you would be unaware of other issues that may give you a CEL.

2. SERG. This Devise prevents the CEL light due to EGR being disconnected. Devise built by and designed by Lost Membors.

3. GDE Tune. Disables the EGR also adding better power and MPG.

There you go. Good luck

fxjr73 · **Joined:** Mon Nov 02, 2009 10:37 pm **Posts:** 16

There is no doubt in my mind about the importance of the GDE tune.This FCV thing only makes acquiring it all the more urgent. I wish I'd known about the tune before I wasted time and money installing that EGR.

So...

1. papaindigo I did mean MAP, not MAF. I keep reversing them in my head for some reason. I cleaned the MAP sensor and broke the return block trying to move the hose slightly. I have a side by side photo of my homemade fuel return next to the brass one and will certainly post it below (if I can figure out how) or will send it to you. I got the idea from a LOST member post.

2. Hexus and kjjet I will do the ORM before I drive another inch, thank you. I'll just keep monitoring the codes. Hexus, I don't use 0-40, I use Shell Rotella T6 5-40 Synthetic and the big Eao26 Amsoil oil filter, so hopefully that's making a difference until I get the tune.

3. GDE ECO tune is my big priority for sure. Then I'll be making some of the other mods talked about in the NOOB guide. First one being the EHM or Provent. Then I'll be pulling my Samcos and giving them a thorough clean and inspection. They've been on a year easy by now and without the EHM or provent and with my other issues, they probably need to be checked.

3. Just reading the mods that you guys listed in your profiles, I want to do all of them on my CRD. Especially the upgraded Suncoast TC and the GDE Stage II turbo. I'll admit, I didn't know when I bought the Liberty that it was such a tinkerers vehicle. I like working on my vehicle, but don't really have the time that should be dedicated to the CRD. It's pushing 130K though now, so I'm gonna have to find more time. I also need to find more money so I can mod and upgrade! :mrgreen:

Thanks so much for the immensely helpful feedback and expertise.

fxjr73 · **Joined:** Mon Nov 02, 2009 10:37 pm **Posts:** 16

papaindigo, here's that photo of my brass return block

I did run into one issue with this...

The largest diameter fuel line had a plastic inner lining which was molded to the fuel return outlet/inlet. I couldn't pull it off, so I had to bend and break the lining. I clamped the remnant of the hose tightly around the brass outlet/inlet, but I'm going to replace that fuel line. In fact, I may just replace all of them.

kjjet · **Posted:** Sat Mar 23, 2013 8:01 pm

fxjr73 wrote:

There is no doubt in my mind about the importance of the GDE tune.This FCV thing only makes acquiring it all the more urgent. I wish I'd known about the tune before I wasted time and money installing that EGR.

3. GDE ECO tune is my big priority for sure. Then I'll be making some of the other mods talked about in the NOOB guide. First one being the EHM or Provent. Then I'll be pulling my Samcos and giving them a thorough clean and inspection. They've been on a year easy by now and without the EHM or provent and with my other issues, they probably need to be checked.

3. Just reading the mods that you guys listed in your profiles, I want to do all of them on my CRD. Especially the upgraded Suncoast TC and the GDE Stage II turbo. I'll admit, I didn't know when I bought the Liberty that it was such a tinkerers vehicle. I like working on my vehicle, but don't really have the time that should be dedicated to the CRD. It's pushing 130K though now, so I'm gonna have to find more time. I also need to find more money so I can mod and upgrade! :mrgreen:

Thanks so much for the immensely helpful feedback and expertise.

If I was to start all over I would not do a Provent or EHM or even a GDE tune. I would just do a SERG, remove the EGR equipment and save a lot of money. Oil from the CCV is not bad for your engine unless it is mixed with EGR. The EHM has proven to have lots of issues also. The GDE tune gives you more power, but I don't like the high rpm at startup and the ruff idle until it warms up. GDE told me the tune dose this and there is no way around it.

Just :2cents:

msilbernagel · **Posted:** Sat Mar 23, 2013 9:15 pm

I have the SEGR and was around when it was being designed and tested. If you do proceed, don't remove or disable the EGR/FCV, as they are still exercised when the vehicle is in park or neutral.

That said - I installed it when the EGR/FCV were replaced at about 30k miles, and have had no problems with them since (now at 164k).

FYI - Mark

kjjet · **Posted:** Sat Mar 23, 2013 9:39 pm

msilbernagel wrote:

I have the SEGR and was around when it was being designed and tested. If you do proceed, don't remove or disable the EGR/FCV, as they are still exercised when the vehicle is in park or neutral.

That said - I installed it when the EGR/FCV were replaced at about 30k miles, and have had no problems with them since (now at 164k).

FYI - Mark

They may? but the engine dose not need them. I don't want that stuff in my engine. Not even a bit. Mine are both gone. I do Have a GDE tune. But it really dose not matter what disable system you have the engine will run great without them. Leaving them, your just taking a chance they will break and cause more issues like they are known to do.

fxjr73 · **Joined:** Mon Nov 02, 2009 10:37 pm **Posts:** 16

Well, you guys were all on the right track about the problem being something other than the turbo. The turbo is fine. In fact there's do discernible play in it that I can feel whatsoever. The turbo end of the airbox to turbo hose, however, had a loose clamp plus cracks and a hole. Look at this thing...

I'm still planning to degrease everything and check the other stuff you mentioned, but this makes me feel relieved.

I just can't figure out what my mechanic did to supposedly diagnose that the turbo needs to be replaced since it took me about ten minutes to find the obvious issue with the hose.

Thanks again for all your help.

The amazing disappearing and reappearing 0299/0401 codes.

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