VW MK5 GTI LIMP MODE AFTER DIVERTER VALVE CHANGE
Discussion
Hi guys need help here I wasnt feeling much power in my mk5 gti so i had the diverter valve changed as had a problem with boost circulation on the dignostics. Was put on dyno and was only producing 162 bhp after I changed the valve it produced 219 well impressed with that so I have been kicking it a little especially over bumps it went into limp mode struggling to go over 40 mph even in sports mode. So I turned car off and put it back on and it has been fine any ideas as to what may have happened.
aka_kerrly said:
Rather than continue to drive around like an idiot take the car back to whoever fitted the diverter and explain the likelihood that you ragging it over bumps and taking it to 100mph in limp mode has created new issues for them to fix.
I drove like an idiot pal to suss out more which i have. and it wasnt in limp mode when i was ragging it aka_kerrly said:
Sorry for blunt reply, so you've given it the ol Italian tune up then, I read it as you've been hammering it more and more whilst new issues develop.
Most likely is the new diverter has resolved one boost issue and the increased boost has now upset another sensor or a boost pipe/connector has failed. I'd try disconnecting battery earth for a few min, unplug the MAF sensor and go for a quick drive and see if it's any different. Hunt around the vacuum lines around the throttle body, check the intercooler piping and go from there.
Since you mentioned bumps, il presume speed bumps you may have simply knocked the turbo outlet pipe which is under the car on the driver side at the back of the engine bay. It loopw under subframe and toward the front of the car into the intercooler
Im going to have it checked by the end of the week or next week going to leave the bad boy to rest il keep you guys updated.Most likely is the new diverter has resolved one boost issue and the increased boost has now upset another sensor or a boost pipe/connector has failed. I'd try disconnecting battery earth for a few min, unplug the MAF sensor and go for a quick drive and see if it's any different. Hunt around the vacuum lines around the throttle body, check the intercooler piping and go from there.
Since you mentioned bumps, il presume speed bumps you may have simply knocked the turbo outlet pipe which is under the car on the driver side at the back of the engine bay. It loopw under subframe and toward the front of the car into the intercooler
Hey guys after a full service and a turbo cleaner spray the problems have gone. But now appears another few the car temperature drops slightly when driving it takes a good 10mins for the needle to move doesent move significantly but goes back forward a little unless u hammer it it stays in middle. And on a cold start theres a strange noise that sounds like a belt or a fan touching some plastic its from around the oil dipstick area goes away when car is about to get warm or driving for around a mile it only happens when starting first time.
mercedeslimos said:
The low temp will be the thermostat. I assume it's not a DSG (they have 2!) it's behind the alternator, the thermostat is part of a housing (black plastic with a plug on it) and genuine VW about 60 sheets. Common on every MK5 TFSI I've come across.
Yh i done abit of research and seen it coukd be that or the water temp sensor and its a dsg on 87000miles. How would you know which one needs changing if its the thermo. And any idea on the sound when it starts up coldmercedeslimos said:
Likely to be the 'stat. Sensors rarely give trouble and it would flag a code. They have 2 coolant temperature sensors too just to be sure. Rattle could be VVT chain/tensioner, they like to give bother too.
Ah okay il try to get that sorted then pal as well as getting the chain il keep you guys updated once again cheers😁
mercedeslimos said:
No hassle, I have an Eos with the same BWA engine and a mate has a GTI too. Lots of stuff done to the pair of those. If you haven't done it yet, drop the sump and clean the oil pickup ASAP
Just had it serviced mate and told mechanic about the oil pressure light ans was told by few mechanics to check the sump and pipe. But the guy i took it too said its ok it did not throw up any lights no need to check. 🤔Jazoli said:
I'd ignore that bit of advice and get the sump dropped and the strainer cleaned or replaced, mine was almost completely blocked with carbon and other s
te, just because there is no lights or warnings doesn't mean it's not blocked, starving the engine of oil will cost you big time if you don't sort it asap.
Yeah thats fine im having it dropped of tomorrow morning so il get it all sorted out. Till then ill keep you guys informed cheers 😁te, just because there is no lights or warnings doesn't mean it's not blocked, starving the engine of oil will cost you big time if you don't sort it asap.Right guys so I have had the timing belt, fan belt and water pump changed along with the thermostat from mechanic. The thermo hasnt made much change as the temp still drops slightly. And yesterday when flooring it locally the car went into limp mode again on low fuel😅. Im not sure if it could be the dv valve as the turbo did get cleaned after it went into limp mode first time and all power is there it goes like a absolute rocket. Btw dv was changed not long ago along with turbo clean and full service. P0234 boost pressure regulation limit exceeded (over boost condition) p0234 upper limit reached-intermittent.
John767 said:
Right guys so I have had the timing belt, fan belt and water pump changed along with the thermostat from mechanic. The thermo hasnt made much change as the temp still drops slightly. And yesterday when flooring it locally the car went into limp mode again on low fuel??. Im not sure if it could be the dv valve as the turbo did get cleaned after it went into limp mode first time and all power is there it goes like a absolute rocket. Btw dv was changed not long ago along with turbo clean and full service. P0234 boost pressure regulation limit exceeded (over boost condition) p0234 upper limit reached-intermittent.
Im not sure if im pointing towards a new turbo as the lad i took it to first said that the vanes were getting stuck.GreenV8S said:
Are you saying that you had these three codes after the latest incident? What was the low fuel code?
Sorry mate its all one code and i took it to garage and mechanic saw the air intax hose loose and a pipe which the maf sensor being loose with a clip missing so idk if thats anything to do witg itGassing Station | Engines & Drivetrain | Top of Page | What's New | My Stuff