Tomlouns
Well-Known Member
- Thread starter
- #1
I NEED HELP - there is no CEL... I am not sure what to do next... Please let me know your thoughts.
This issue started / I first noticed it after WOT second gear pull to about 7400 RPM... I have not gone WOT with the car in about 3 weeks... The last time I did was for testing with PBD... about three weeks ago.
The car idles fine but if you put your foot on the gas in gear... it has a misfire then after a 1 second will kick in hard and then run fine... If I role into the gas "very" slow... just barley toughing the peddle it will not have the hesitation and a knock and then I can accelerate normally... I have attached 3 logs for review... It always had long hot starts... now the hot starts are 2x as long and sometimes it even "times out" and I have to press the start button again, it then will start the second time... Cold starts are about the same as they were before, maybe a little longer...
You can see the car now runs lean on idle... it didn't before. Why would this change?
Thoughts I have:
1. Mass air flow sensor?( I have cleaned it... but don't know how to test this)
2. Bad gas? I ran it down to 1/2 a tank and filled it up with Mobile 93 this made it run better but I am still having the issue listed above... I am now down to 3/4 tank and will top it off again today...
3. Spark plugs.. nope... but I put new ones in just in case... I have attached a pic. of the old ones they were all the same
4. Bad Coil? don't know how to test this -
5. Bad knock sensor? I don't know how to test this...
6. Bad fuel pump? It is new an the fuel pump and voltage booster. and if I am reading the fuel trims right... they look like they are in the normal range.
7. A issue with the tune? I am checking with PBD...
Setup:
2015 Mustang GT 32,000 miles and only about 800 with the whipple on it...
whipple stage 2 gen 3
132mm TB
Whipple intake
DW 95LB injectors
DW 400LPH fuel pump with a voltage booster
long tube headers with green flow cats
NGK 6510 LTR7IX-11 gap .028"
Magnaflow 3 in cat back
Auto trans
Oil pump gears
This issue started / I first noticed it after WOT second gear pull to about 7400 RPM... I have not gone WOT with the car in about 3 weeks... The last time I did was for testing with PBD... about three weeks ago.
The car idles fine but if you put your foot on the gas in gear... it has a misfire then after a 1 second will kick in hard and then run fine... If I role into the gas "very" slow... just barley toughing the peddle it will not have the hesitation and a knock and then I can accelerate normally... I have attached 3 logs for review... It always had long hot starts... now the hot starts are 2x as long and sometimes it even "times out" and I have to press the start button again, it then will start the second time... Cold starts are about the same as they were before, maybe a little longer...
You can see the car now runs lean on idle... it didn't before. Why would this change?
Thoughts I have:
1. Mass air flow sensor?( I have cleaned it... but don't know how to test this)
2. Bad gas? I ran it down to 1/2 a tank and filled it up with Mobile 93 this made it run better but I am still having the issue listed above... I am now down to 3/4 tank and will top it off again today...
3. Spark plugs.. nope... but I put new ones in just in case... I have attached a pic. of the old ones they were all the same
4. Bad Coil? don't know how to test this -
5. Bad knock sensor? I don't know how to test this...
6. Bad fuel pump? It is new an the fuel pump and voltage booster. and if I am reading the fuel trims right... they look like they are in the normal range.
7. A issue with the tune? I am checking with PBD...
Setup:
2015 Mustang GT 32,000 miles and only about 800 with the whipple on it...
whipple stage 2 gen 3
132mm TB
Whipple intake
DW 95LB injectors
DW 400LPH fuel pump with a voltage booster
long tube headers with green flow cats
NGK 6510 LTR7IX-11 gap .028"
Magnaflow 3 in cat back
Auto trans
Oil pump gears
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