How JustAnswer Works:
  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.
Ask peterpete190 Your Own Question
peterpete190
peterpete190, Auto Technician
Category: BMW
Satisfied Customers: 24656
Experience:  Over 17 years diagnosing and repairing vehicles.
14928985
Type Your BMW Question Here...
peterpete190 is online now
A new question is answered every 9 seconds

528: george, Running a 99 bmw 528 150,00 miles and having

Customer Question

Hi george, Running a 99 bmw 528 150,00 miles and having some problems. An intermittent miss at freeway speeds and random stalling started the repair process. Codes for cam shaft posi sensors popped up. replaced both. Then 420 cat effc. began a few days later. replaced both cats and both 02 sensors. Check fuel pressure and value, OK. still having missing and stalling and 420 code will not go away. any ideas?
Submitted: 1 year ago.
Category: BMW
Expert:  peterpete190 replied 1 year ago.
My name is ***** ***** I am a professional here at Just Answer. I noticed that your question was not getting a response and thought I would see if you still need help with this.I apologize for the delay and I hope I can still assist you with this here.
Inspect for any exhaust leaks before the oxygen sensors and catalytic converter.If there is a leak this will need repaired as this can make the oxygen sensors read incorrect exhaust gas and cause the engine to run to lean causing misfires and possibly even a stall out like this here.
If no leaks are found let me know.
Thanks Pete
Customer: replied 1 year ago.
I will check for leaks. However i was having the missing an stalls before any emissions work was done.
Expert:  peterpete190 replied 1 year ago.
The only other thing I have seen cause all of these issues here is a weak fuel pump or restricted fuel filter.If these have not been checked this should be done to see if any of these are the cause here.
Thanks Pete
Customer: replied 1 year ago.
both fuel pressure and value were checked.
Expert:  peterpete190 replied 1 year ago.
Let me know if any leaks were found.
Thanks Pete
Customer: replied 1 year ago.
Pete,
I messed my back up. I'm going to try to check again for leaks in a few days. will keep you posted
Expert:  peterpete190 replied 1 year ago.
Sounds good.I hope you feel better soon.Let me know how this turns out here and if you need anything else when your ready.
Thanks Pete

Related BMW Questions