Just replaced whole exhaust system oxy sensors, full tuneup plugs wires rotor cap everything still got a miss and low power. haven't replaced the cool yet and runs the same maf plugged in or not it is a newer maf. New car manifold replaced a lot and very frustrated. Any volvo genius have an idea? We are lost and it is a daily driver. Thanks guys

 

anything?

 

Do you have a check engine light on ??


Just replaced whole exhaust system oxy sensors
Can you try to write so we can understand what it is you are saying ??

Did you replace the whole exhaust system or both the O2 sensors ??

haven't replaced the cool yet

If you are talking about the ignition coil it isn't going to give you a "miss". Usually a miss is a cylinder or two not firing or not firing properly.
If the coils a problem it will be hard to start or lack of higher RPM power on all cylinders but not a "miss" feeling.

Have you thought about doing a compression test to see if you might have a weak cylinder from a mechanical problem and not ignition ??

Might also be one fuel injector leaking too much or plugged and squirting too little.

Try to read your post before you post and maybe after you post to see if it's making sense and if your spelling is correct. If you can't take the time to make the question make sense why should anyone take the time to answer ??

Try reading these:
http://www.matthewsvolvosite.com/for...pic.php?t=6283

http://www.matthewsvolvosite.com/for...ic.php?t=49113

https://volvoforums.com/forum/volvo-...ank-1-a-54611/

https://volvoforums.com/forum/volvo-...t-maybe-17628/

 

sorry guys just frustrated so I typed badly. I replaced the whole exhaust system and the oxygen sensors. and yes i haven't replaced the coil yet. I also have not replaced the fuel presssure regulator yet. Again sorry guys and hope this helps.

 

no check engine light but code po172.

 

Gained about 5mph with the vacuum line from the intake to the flame trap blocked if that relates to anything. Maybe fuel pressure regulator?

 

http://atthetipwebs.com/technologyin...ssion_test.htm

 

Thanks ill give that a try

 

Real quick what o2 sensors are you using>??

 

Oem Bosch sensors. I heard others caused problems. Anyone ever experience a fuel pump or fuel controller causing these symptoms? Gonna check compression and fuel pressure tomorrow

 

Well guys turns out when I did my oil seal replacement I messed up the timing. The diagram I had looked at was not for my car. It seems that on some of them the timing marks are a little different. Anyway, I finally got the timing together and the car runs like a top!!!!! Thanks to everyone for your suggestions. BTW I did a compression test and got 210 on all cylinders and fuel pressure test came out at 40 so everything checks out great now!!! Be careful if you mess with the timing as I did. Make sure you are lining the correct marks up for you year car, mine seemed to be different.