Weston Graham
Newbie
Hello everyone,
Getting down to the basics,
Idle: cold and hot runs perfect, couldnt be happier
Granny driving: Runs very well with no check engine light or stuttering
WOT and anytime after: Will steadily increase up until about 50mph where it will then start to lose power, then it will slowly increase. Watching the handheld scanner both fuel systems go into OL fault (open loop fault) and a Multiple Random Engine Misfire (note, when the light first came on, it was a cylinder 7 misfire but switched to this) will occur when trying to mash it going anywhere above 50mph. Produces more of a whine than the mighty 5.7L roar that typically comes with the mash. Ran seafoam through and it seemed to improve slightly, however now pulling codes with give a O2 Sensor Circuit Low voltage Bank 1 and Bank 2 sensor 1. Im not entirely sure if this is from the misfire or from seafoam or is actually the cause of all of it. MAF sensor reads about .3 lbs/sec when WOT. Fuel filter replaced, after which the fuel trim was at about -12% for all long term trims suggesting a rich condition.
Also, there is a coolant leak that cannot be found, steadily looses coolant. Possibly bad intake gasket.
This is a lot of information, trust me, I have a headache too. IF anyone can offer any ways of testing and possibly finding a solution at home that would be great, otherwise its going to be taken to the local shop.
Current possibilities:
Both O2 Sensors are bad
MAF is bad
Injectors are bad
Fuel pump is bad
Fuel pressure regulator is bad
Bad Intake gasket
Getting down to the basics,
Idle: cold and hot runs perfect, couldnt be happier
Granny driving: Runs very well with no check engine light or stuttering
WOT and anytime after: Will steadily increase up until about 50mph where it will then start to lose power, then it will slowly increase. Watching the handheld scanner both fuel systems go into OL fault (open loop fault) and a Multiple Random Engine Misfire (note, when the light first came on, it was a cylinder 7 misfire but switched to this) will occur when trying to mash it going anywhere above 50mph. Produces more of a whine than the mighty 5.7L roar that typically comes with the mash. Ran seafoam through and it seemed to improve slightly, however now pulling codes with give a O2 Sensor Circuit Low voltage Bank 1 and Bank 2 sensor 1. Im not entirely sure if this is from the misfire or from seafoam or is actually the cause of all of it. MAF sensor reads about .3 lbs/sec when WOT. Fuel filter replaced, after which the fuel trim was at about -12% for all long term trims suggesting a rich condition.
Also, there is a coolant leak that cannot be found, steadily looses coolant. Possibly bad intake gasket.
This is a lot of information, trust me, I have a headache too. IF anyone can offer any ways of testing and possibly finding a solution at home that would be great, otherwise its going to be taken to the local shop.
Current possibilities:
Both O2 Sensors are bad
MAF is bad
Injectors are bad
Fuel pump is bad
Fuel pressure regulator is bad
Bad Intake gasket
Last edited: