2004 R50 is driving me crazy!
Posted: Wed Mar 25, 2020 11:39 pm
Hey guys,
I have a 2004 R50 VQ35DE engine, and I'm having an issue that is driving me totally crazy and I don't know what else to do... issue is: very slight/minor hesitation/misfire at idle...
Conditions of the issue: can happen when the car is cold or hot (doesn't matter), sometimes is more noticeable than others... it only happens at idle.. car behaves perfectly under any other condition... no change on fuel consumption or power loss...no check engine or stored codes... no recent changes to the car... the issue happened after a long trip (around 180 miles). When we arrived to the destination, I started to notice that... before that everything was perfect... engine has only 86.000 miles since new (very low mileage and no abuse of the car).
Since the issue appeared a couple of months ago, the following maintenance/changes have been done to the car trying to solve the issue:
- Oil change (Mobil 1 5w30 fully synthetic)
- New OEM oil filter
- New OEM air filter
- New spark plugs (OEM PLFR5A-11)
- New ignition coils (all 6 of them)
- New crank sensor
- New MAF sensor
- Complete cleanup of intake manifold, including testing and cleanup of injectors
- PCV valve replacement
- Idle re-learn procedure
- New OEM fuel filter
Again, car works perfectly fine under any circumstance except idle. No vacuum leaks (reading is steady at 18 inHG). Emissions test passed succesfully. No smoke. Alternator working as expected (6 months old battery)
I'm out of ideas on what else to do to solve the issue and I'm really getting frustrated as none of the changes have helped or making the issue worse, and the ECU doesn't seem to be worried about it (no CEL).
Anyone with a similar issue/experience? Any suggestion or input?
Thanks in advance and sorry about the long post...
Regards,
Luis
I have a 2004 R50 VQ35DE engine, and I'm having an issue that is driving me totally crazy and I don't know what else to do... issue is: very slight/minor hesitation/misfire at idle...
Conditions of the issue: can happen when the car is cold or hot (doesn't matter), sometimes is more noticeable than others... it only happens at idle.. car behaves perfectly under any other condition... no change on fuel consumption or power loss...no check engine or stored codes... no recent changes to the car... the issue happened after a long trip (around 180 miles). When we arrived to the destination, I started to notice that... before that everything was perfect... engine has only 86.000 miles since new (very low mileage and no abuse of the car).
Since the issue appeared a couple of months ago, the following maintenance/changes have been done to the car trying to solve the issue:
- Oil change (Mobil 1 5w30 fully synthetic)
- New OEM oil filter
- New OEM air filter
- New spark plugs (OEM PLFR5A-11)
- New ignition coils (all 6 of them)
- New crank sensor
- New MAF sensor
- Complete cleanup of intake manifold, including testing and cleanup of injectors
- PCV valve replacement
- Idle re-learn procedure
- New OEM fuel filter
Again, car works perfectly fine under any circumstance except idle. No vacuum leaks (reading is steady at 18 inHG). Emissions test passed succesfully. No smoke. Alternator working as expected (6 months old battery)
I'm out of ideas on what else to do to solve the issue and I'm really getting frustrated as none of the changes have helped or making the issue worse, and the ECU doesn't seem to be worried about it (no CEL).
Anyone with a similar issue/experience? Any suggestion or input?
Thanks in advance and sorry about the long post...
Regards,
Luis