Car: 2008 2.2 5 door, Blue-ish
Join Date: 21st March 2018
Location: Southampton, UK
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Randomly entering limp mode - *No Check Engine or Error Codes!*
Hi everyone! I'm excited to say this is my first post of many on the forums! Not so excited to say, I have a doozy of a problem on my 180k miles 2008 2.2 CDTi...
The old girl has been slowly decreasing in fuel economy - down to low 40's on the motorway from the low 50's a few thousand miles ago. It also began sputtering/lurching slightly and hesitating slightly on acceleration. This happens only on occasionally and seemingly inconsistently. After hitting a pothole a few weeks back before a half hour drive, my car went into limp mode on the return journey. Very slow acceleration, flooring the pedal barely goes over 2k revs, struggling severely on hills and impossible to get it over about 40mph. I pulled over and reset the inertia switch, which seemed to fix it, but this has happened a couple times since then.
The car runs fine for fairly large distances, goes into limp mode, then begins working fine again after stopping the engine for a bit. The strange thing is during all this, I have NO check engine light, and NO error codes on my OBDII scanner! I'm looking to borrow someone else's to check that it's not my scanner being bad.
So far, all I've already done is an oil change and changed the air filter to no effect. My current thoughts are:
1- The fuel filter may be clogged, and perhaps the bump loosened some carbon. I'll change the fuel filter, fill it with seafoam before re-installing and give it a good running to see if that clears things up. I doubt it is the fuel pump, as the issues are so inconsistent.
2- Perhaps the EGR valve needs cleaning. I read a very similar thread where it was an EGR valve issue, however, the lack of a check engine light in my case seems very odd.
3- Issues with the MAF could cause lurching and hesitation. Would this not cause more consistent faults? And the MAF would surely trigger a check engine light.
Beyond this, I'm not sure what else it could be or what I should do (this is relatively new to me). Has anyone else had similar issues? What else could these symptoms stem from?