1998 BMW Z3 Repair Question
Mileage: 15,500 miles.
Need help to repair rough idlewhen cold and engind codes that keep coming back P0170 and P1188
Asked by texasdawg2003Answer
if more information please ask i well get information needed to repair car as needed.to repair codes and cold starts
both codes are related to long term tirms out of range.
possible causes are vacuum leaks, low fuel pressure, pcv system, mass air flow sensor. all these need to be verifed by a shop with a scan tool that can monitor these systems.
Roy
the intake was smoke tested for leaks.ccvv was replaced, mas air flow was replaced and no differance what should fuel presssure be and numbers do you need to see from the monitor
was the smoke test done cold when the issue occured. when it gets hot and runs better, the seals expand and seal off vacuum leaks.
Roy
the test was done cold i did another test i took off the pcv hose and pluged it and it ran fine cold and worm is there an air reductucting valve in the valvle cover or tubing. someone else changed the valve cover gasket so i dont know if there is one or not it did not run rough or set the pending codes like it did before i pluted the line is the spark plug tube seals leaking+
if you leave it plugged, it will not allow the crankcase pressure to vent and you will create oil leaks. just replace the valve.
Roy
ccv has already been replaced it was doing the same thing before it was replaced it olny idles rough when cold as soon as it goes into cloased loop it runs fine
i hear you but i still feel you have vacuum issues when cold and they seal when warm. the people working on the car, are they bmw techs??
Roy
spark plug tube seals and valve cover was replaced again one the first start it did not run rough on start i will see it it runs better on next start it looks like was not holding vacume in eng what should the o2's read while runing
you need a scan tool to read this as they are fuel ratio sensors. the trims are important as they should be under 5%
Roy