2G Car bucks everytime it moves

[Cynxe]

Mods: black box, full speed density, 1200cc injectors, e85, hx35, fp2 272 cams, blocked iac.
I just finished the car. I drove it about 20 miles trying to put break in miles on it, and it started acting up randomly.
Car idles perfect, i can rev all The way to limiter and even antilag, but when i begin driving it, about half a block, it starts bucking ridiculously bad and afrs suddenly fall extremely rich, and it dies. This is at any rpm range and not even on boost. Any ideas?

 

[scrappys93talon]

Major vacume leak under load

 

[Cynxe]

Major vacume leak under load

But the car makes it almost a block, then it starts acting up. Its weird because it will run and idle perfect at 15 afr with e85

 

[scrappys93talon]

Im not running e85 but i know when i had a bad vacume leak and my plugs werent gapped right i had the same problem, rev fine but drive it and it would buck like a bi***, so i re gapped the plugs to 32 thousands and found the vacume leak and the problem went away.
The rich o2 tells me your getting a vacume leak and the computer then dumps a massive ammount of fuel to compensate for it causing the rich 02 reading

 

[Cynxe]

Im not running e85 but i know when i had a bad vacume leak and my plugs werent gapped right i had the same problem, rev fine but drive it and it would buck like a bi***, so i re gapped the plugs to 32 thousands and found the vacume leak and the problem went away.
The rich o2 tells me your getting a vacume leak and the computer then dumps a massive ammount of fuel to compensate for it causing the rich 02 reading

Keep in mind, im also running speed density, so a vacuum leak before the tb would do nothing. Because its map sensor.

 

[pauleyman]

Randonmly suggests to its not vacuum but electrical. Ground or idle position switch perhaps. Although that circuit is normally open. At least start checking connectors.

 

[miliman13]

What's the problem, sounds like a DSM just being a DSM. It's what they do, how else they going to get attention from you.... On a serious note it's impossible to know there are so many possible causes within a wide range. Just look up what others did you may get lucky....

 

[Cynxe]

Randonmly suggests to its not vacuum but electrical. Ground or idle position switch perhaps. Although that circuit is normally open. At least start checking connectors.

You must be logged in to view this image or video.

This is a short video, the wideband is in perfect view, itll suddenly go rich and buck and die

 

[pauleyman]

Will it always sit and free rev in neutral sitting still?

 

[Cynxe]

Will it always sit and free rev in neutral sitting still?

Yes, i can antilag all day and rev. But as soon as i put it in 1st and start driving it goes to crap

 

[pauleyman]

Not sure about black box tuning but does it have a speed sensor triggered two step? Bad speed sensor? If you have something clutch activated it check the too clutch switch.

 

[Cynxe]

Not sure about black box tuning but does it have a speed sensor triggered two step? Bad speed sensor? If you have something clutch activated it check the too clutch switch.

My car bucks with normal driving, im not trying to launch or anything. Just regular takeoff, have you watched the video?

 

[Cynxe]

Update: did a log and my map sensor is reading lots of positive pressure, 14psi at 1600 rpms 23% throttle. Why would it read such numbers. This would be the reason why its so ridiculously rich, but how do. You fix this?

 

[pauleyman]

Looks like you found your problem. New map sensor?

 

[Cynxe]

Looks like you found your problem. New map sensor?

Just unplugged the map and the car wont run, it just dies. So i feel like maybe that takes map off the list. While the car is running, i unplugged the tps and nothing changes, and it bucks the same with it plugged in and unplugged, tps would cause this yes?

 

[Cynxe]

UPDATE: I unplugged and replugged in the map sensor and the car runs perfect, moral of the story, some. Things just need to be unplugged. Thanks for the halp guys! #haveyoutriedunpluggingitandpluggingitbackin