|
|
04 impala weird issues runs great then dies suddenly
|
|
|
| |
|
|
dwood1971
New User
Mar 15, 2015, 7:13 AM
Post #1 of 2
(1198 views)
|
|
04 impala weird issues runs great then dies suddenly
|
Sign In
|
|
I have a 04 impala with the 3.8 engine that I'm having some issues with and could use some help. Issues started about 2 weeks ago when the CEL came on for code P0107 Manifold Absolute Pressure/Barometric Pressure Circuit Low Input. Car was running fine with no issues then yesterday while I was on lunch break car justed died it would start back up but cuts of immediatly and will not run. I call a buddy to come and pick me up and I go back to work for about 5 hours. When I get off work go back to car and it runs great so I start home and after about 10 mins of driving samething happens. Luckly I was close to a parts store so I purchased a MAP sensor and installed it and reset the code P0107 but still would not run. Left car sitting in a parking lot over night and go back the next day and car starts right up and runs fine. I start home again and car doing ok for several miles and then the CEL starts to flash I get it home and check codes and it has the P0300 for multiple misfires. Now I have it home where i can work on it.
Car runs fine for about 15 miles then starts to act up. I have done some research and symptoms point to clogged Catalytic Converter. To test this theory can I just pull the upstream O2 sensor to releave the back pressure form the CAT ?
I have graphed sensor data for O2 sensor, MAP sensor , and also MAF sensor. Uploaded a slide show to youtube and attached the link. 
Details
Engine Cold....MAP sensor with engine off key turned on reading 1.0 ATM. Then started car and reading went to .42 ATM at idle and when I increase RPM to 2500 drops to .28 ATM I did not take pictures of this picture are from after car had warmed up.
Engine warm...MAP sensor at idle .35 Atm increase RPM goes to .28 Atm
O2 sensor car was warmed up to operating temp graph is in slide show but noticed when I increased RMP graph changed dramatically and graph was all over notice in picture one picture is at idle and the other is at 2500 RPM.
MAF sensor was also showing some funning readings ...see pictures
SUGGESTIONS ? ? ? ?
|
|
| |
|
| | |
|
| | |
|
Auto Repair Home
SEARCH
WHO'S 
LOG 
