Limited to 3000 rpm?

rictek · **Posted:** Thu May 17, 2012 9:20 am

Accelerating onto the toll way this morning, I felt what seemed like a converter lockup shudder and then no power. I noticed I have reduced power up to 3000 rpm but nothing more. I could barely keep up with traffic. What could have happened? I'll check the codes if make it home tonight.

papaindigo · **Posted:** Thu May 17, 2012 9:35 am

Limp mode?

rictek · **Posted:** Thu May 17, 2012 6:12 pm

Weird. The drive home had full power up to 4000rpm. The only code showing is P102. :wink:

naturist · **Posted:** Sat May 19, 2012 5:43 pm

Sounds like limp mode to me. I don't know off the top of my head what that error code is, but I do know that a clogging fuel filter will cause exactly what you describe. Find out what that error code means for sure, however.

For what it is worth, the clogging fuel filter limp mode will last until the engine is shut off and restarted. It also will occur repeatedly under hard acceleration, and gradually get worse until you replace the fuel filter.

Yes, there are other things that can cause such a problem, but fuel filter is the most likely culprit, especially if you haven't replaced it recently. A load of bad/dirty fuel can also cause the filter to clog.

rictek · **Posted:** Thu May 24, 2012 11:17 am

naturist wrote:

For what it is worth, the clogging fuel filter limp mode will last until the engine is shut off and restarted. It also will occur repeatedly under hard acceleration, and gradually get worse until you replace the fuel filter.

That does fit the symptoms. I am frequently under hard acceleration, repeatedly. :JEEPIN:

P102 is MassAirflow sensor. That one is intentional.

ChooChooman74 · **Posted:** Fri May 25, 2012 9:37 pm

Mine went into limp mode. Before shutting it down, I put my GDE Programmer/scanner on and it gave me 2 P0093 codes. I cleared them and ran fine even without shutting down.

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CRD'syeruncle · **Joined:** Tue Jul 10, 2012 9:31 am **Posts:** 22

I'm late to this thread, but I am having a 'limp' mode issue. I had to run into town today, and my CRD lost power above 2200 rpm. Luckily it didn't happen when I was trying to pass on a hill.

The symptoms are as follows:

- loss of power above 2500 rpm, so much so that it seems the transmission is not engaging when the tach reaches 3000 where it will go no higher.

- in first and second, there is still boost, where I can easily spin the tires on dirt, and the tach will push up to redline, 4000 rpm.

- turning the engine off, letting it sit for a while seems to reset the 'limp' mode, giving restored boost pressure for a while, then it returns to this state.

The CRD still drives, but hasn't the power to pass at highway speeds, and stepping on it doesn't cause the engine to down shift and accelerate.

I haven't yet purchased the GDE programmer/tuner, so I don't know what codes it might be throwing.

Any idea from the membership?

naturist · **Posted:** Thu Aug 16, 2012 12:28 pm

Limp mode is what it's called. It is the computer's attempt to keep you from damaging high pressure fuel system components, and occurs most often when your fuel filter is clogging.

It is reset to normal by simply switching off the engine and restarting. No need to wait for anything to cool down. In fact, if you are moving slowly enough and in a straight line, it is possible to do it without even coming to a halt, just switch off, and restart.

Clearly the designers of this vehicle never considered the possibility that saving the high pressure fuel pump could cost you your life as the speeding truck coming 'round the blind corner squashed you flat 'cause Limp Mode prevented your getting on with getting on down the road.

Fuel filters for this vehicle are expensive, as fuel filters go, but cheap, compared to many other components that can cause this problem. And face it, they need to be replaced from time to time, anyway. Since a single tankful of really crummy diesel can cause the demise of a brand new fuel filter, and since if the filter clogs, your only option is to replace it -- you can't "adjust" your way out of that one -- when you start getting limp modes, save yourself some hassle and just replace the f'ing filter.

And for what it is worth, for some reason the reduced fuel flow due to a clogging filter can sometimes create a P0093 "large fuel leak" error.

BlackLibertyCRD · **Posted:** Thu Aug 16, 2012 7:32 pm

starving for fuel.

CRD'syeruncle · **Joined:** Tue Jul 10, 2012 9:31 am **Posts:** 22

Thanks for the advise, guys. It won't reset by turning off and then back on. I am a new/used owner and followed the noob's guide, second of which was to change the fuel filter. I will try again and see what happens...

METCRD · **Posted:** Fri Aug 17, 2012 5:57 pm

Possibly a failed FCV.

CRD'syeruncle · **Joined:** Tue Jul 10, 2012 9:31 am **Posts:** 22

So the fuel filter change was a bust. Still running in the same soft limp mode, not allowing for boost pressure above 3000 rpm. It's gotta be a sensor; some forums suggest a faulty MAF. I took a look at it and it was relatively clean. I will make an appointment next week and get a diagnostic done. Was hoping that someone else had had this problem, hence the topic. Will keep ya posted...

msilbernagel · **Posted:** Sat Aug 18, 2012 10:53 pm

Do you have a diagnostic scanner?

The ScanGauge II (or something like it) is *really* handy here because you can read the sensor output and see if it appears to be sane.. crazy/illogical or unchanging values would be a good sign of a failed sensor, or faulty wiring.

Mark

CRD'syeruncle · **Joined:** Tue Jul 10, 2012 9:31 am **Posts:** 22

Not yet. I am probably going to purchase the GDE flash programmer tool. I am working remote and have not had the opportunity. Any opinions on the GDE tool?

msilbernagel · **Posted:** Sun Aug 19, 2012 7:29 pm

No experience with the tool - but everything they provide comes with expert and excellent advice/coaching, so it seems like an excellent choice to me.

Mark

CRD'syeruncle · **Joined:** Tue Jul 10, 2012 9:31 am **Posts:** 22

Tool ordered. Now I just wait patiently.... (my city runabout is a RHD 5 speed std Daihatsu mini truck)

spitfire36o · **Posted:** Wed Aug 22, 2012 4:28 pm

you need to clear the code before it will go away. If the filter was the problem, it wont be fixed with the new filter on until the code is cleared. It could have also been air in the fuel.

CRD'syeruncle · **Joined:** Tue Jul 10, 2012 9:31 am **Posts:** 22

spitfire36o wrote:

you need to clear the code before it will go away. If the filter was the problem, it wont be fixed with the new filter on until the code is cleared. It could have also been air in the fuel.

OK, I wasn't sure of that, but I still think it was a bust due to the fact that I had just put a new fuel filter in 3 weeks prior. The Noob one was absolutely clean, the fuel sensor was clean, and there was not a problem with priming and purging. The member who gave me the longwinded description of what limp mode was made it sound like it would reset as soon as I turned the ignition off and on. My reading continues, and that is why I have put "" around some words, for even if I have a Idea of what is happening from study, without experience I am still walking blind on this one.

I drove the vehicle 1200 KM (800 Mi) home from my worksite under the state of "soft limp" mode, ordered the GDE flash/programmer tool, and have refused to visit the dealership, because of the cost to have a reset done vs purchasing the tool myself and doing it myself. Libby sits and waits.

I will keep you posted.....

CRD'syeruncle · **Joined:** Tue Jul 10, 2012 9:31 am **Posts:** 22

So I received my GDE programming tool in the mail, booted it up, and did the DTC diagnostic. I was throwing 4 codes, none of which had anything to do with fuel leak codes (P0092, 93). I have a stuck EGR which I have the replacement, so understandingly I am throwing a P0401, but the read also shows a P1186, which isn't on the DTC list... Anyone know what this one is?

ChooChooman74 · **Posted:** Wed Sep 05, 2012 1:47 am

I looked up generic P1186 and it says fuel pump temperature sensor low.

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Limited to 3000 rpm?

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