Commander 3.0 crd limp mode no acceleration problems

[djeffery]

Hi guys, I am a newbie and have tried endlessly to find an answer to this problem within all your posts but to no avail. The closest symptoms are that of Gleeson235 but his final fix seems different. Same fault codes, limp mode only when accelerating etc. I've been to at least 3 different so called experts with their scan tools and am not convinced with their "guesses" at mainly pedal replacement.

1st thing I looked at was resistor trick for swirl motor.. Bit more turbo lag but still limped

2nd- I have had the EGR valve out (cleaned, not dirty anyways) and it kinda worked after you revved the motor but it was moving to a degree (maybe had wrong pressure because exhaust open where EGR sits?) To me it should open as you rev up not down. Don't know how to test it separately.

3rd - Had a look for corrosion under battery where Gleeson235 had connection problems and nothing obvious

Now I am thinking that maybe the inlet manifold is stuck/ blocked at swirl motor (thought I would have got a fault code for swirl but haven't as yet).

Just wondering, can you get to the swirl motor without turbo removal? I had heard that the default position is open hence resistor mod but just want to check its not stuck shut???
Any other ideas?

Cheers Darren

[vk2jdh]

Originally Posted by djeffery

Hi guys, I am a newbie and have tried endlessly to find an answer to this problem within all your posts but to no avail.

Cheers Darren

What codes are you getting. Is the MIL illuminating? How do you get it out off Limp Home ?

[djeffery]

Hi and thanks for the reply...

Getting the following

Always P2122, P2135, P2136 (All to do with pedal/motor voltage discrepancies)

occasionally P0673 (#3glow plug) and P0513(incorrect key) - irrelevant

Originally I had a P0299 (turbo underboost) which may have been an old one and can't reproduce but worth a mention

Also when I disconnected the EGR I got P0403 but is now fine

The Jeep mechanics want to replace the pedal assembly but I am not convinced because when stationary, you can rev the motor till your heart is content with no MIL. It is only until you drive and accelerate too hard (or towing) that it will go into limp mode with the ETC light flashing and Check engine light on constantly. Seems to be not as bad when engine is cold but when at operating temp faults real easy??? Just have to stop the engine ( can do this when rolling in neutral too) restart and and gently drive home. Can reach any speed just gradual acceleration. Seems to me as if swirl motor is stuck or maybe a sensor in the turbo. Don't know how to test the turbo actuator but it does move. EGR moves too but weird when I had it out.

Hope that helps...

Daz

[Clarky]

I am leaning to the side of the experts.
Everything points to the accelerator. Have you removed the pedal assembly at all? There would be a plug where it connects to the loom, check for corrosion/ bad connections.
When you shake the accelerator pedal with your hand is there any sideways movement or when pressed all the way in is the action smooth?

I would pull the pedal assembly apart, thoroughly clean & inspect for sighs of wear.

[djeffery]

Hi Clarky,

pedal is clean and feels as if new but for peace of mind will remove later on in the week and check for corrosion. Problem here is that most dealerships don't have the exposure to this CRD model. Have three different expert opinions so far and pedal replacement was one. Would be nice as this is easy fix but with my luck I can bet its not the case. One mercedes mech said inlet actuator stuck or blocked (assume swirl here) but he can't be sure.

You guys are the real experts as common sense prevails and if I can, would like to pick everyone's brains before I go down that path as I haven't got an open check book to give to Jeep...

[Clarky]

I believe if it was the swirl stuck the resistor mod would have stopped it going into limp mode, even if stuck in the closed position.

Even if you ignore the pedal assembly part, the 3 constant codes are all electronic in nature.

Have you remove the battery & check the computer underneath, how old is the battery?

[djeffery]

One of the 1st things I tried is using a new battery but still did it.

Have the battery out at moment and have tried to look for anything obvious (Gleeson235 had similar problem) - nothing stands out. The wires did start to rub into the A/C line but still seem OK.

Will let you know how the pedal assembly is later in the week...