driving fine and boom

[kelvinb]

1/4 tank of 92 and 2 gallons of e85. doing a 3rd gear pull. earlier pulls had no problems at all. This pull I get about 5k into it and it pops and shoots smoke everywhere. I noticed on the log my inj pulse width drops to 0. is this fuel cut?

02 sensor TPS RPM Knock INJ P Air Temp
0.51V 21.2% 3563 0 2.82ms 59.2°F
0.66V 21.2% 3594 0 2.82ms 59.2°F
0.66V 21.2% 3594 0 2.82ms 59.2°F
0.72V 10.2% 3563 0 1.54ms 59.2°F
0.84V 10.2% 3563 0 1.28ms 59.2°F
0.80V 21.6% 3563 0 2.56ms 59.2°F
0.02V 22.4% 3531 0 2.82ms 59.2°F
0.08V 20.4% 3563 0 2.82ms 59.2°F
0.62V 19.2% 3594 0 2.30ms 59.2°F
0.72V 19.2% 3594 0 2.30ms 59.2°F
0.08V 19.2% 3594 0 2.30ms 59.2°F
0.08V 20.0% 3656 0 2.56ms 59.2°F
0.02V 33.7% 3656 0 5.38ms 59.2°F
0.78V 89.0% 4094 0 23.04ms 58.4°F
0.76V 91.4% 4531 0 23.55ms 58.4°F
0.76V 91.4% 4750 0 20.99ms 59.2°F
0.88V 10.2% 4969 0 3.07ms 60.0°F
0.80V 10.2% 3594 0 2.30ms 60.0°F
0.80V 10.2% 2750 0 0.00ms 60.0°F
0.00V 10.2% 3219 0 0.00ms 60.0°F
0.00V 10.2% 2344 0 0.00ms 60.0°F
0.00V 10.2% 2844 0 0.00ms 60.0°F
0.00V 10.2% 2813 0 0.00ms 60.0°F
0.00V 10.2% 2813 0 0.00ms 60.0°F
0.00V 10.2% 2781 0 0.00ms 60.0°F
0.00V 13.3% 2781 0 1.79ms 60.0°F

Timing

38°
38°
38°
38°
40°
32°
38°
39°
39°
39°
39°
39°
38°
17°
18°
18°
19°
41°
38°
27°
26°
25°
26°
26°
26°
26°

 

[Quasimondo]

Well, if you let off the throttle and you're coasting in gear, the ecu will shut the injectors off as a fuel saving measure. Does the engine still run? Pull the plugs and run a compression test to make sure everything is still in one piece.

 

[kelvinb]

yes it was full throttle, and yes i drove it home. its done this before, but i was never able to log it.

 

[steve]

1/4 tank of 92 and 2 gallons of e85. doing a 3rd gear pull. earlier pulls had no problems at all. This pull I get about 5k into it and it pops and shoots smoke everywhere. I noticed on the log my inj pulse width drops to 0. is this fuel cut?

02 sensor TPS RPM Knock INJ P Air Temp

0.08V 20.0% 3656 0 2.56ms 59.2°F
0.02V 33.7% 3656 0 5.38ms 59.2°F
0.78V 89.0% 4094 0 23.04ms 58.4°F
0.76V 91.4% 4531 0 23.55ms 58.4°F
0.76V 91.4% 4750 0 20.99ms 59.2°F
0.88V 10.2% 4969 0 3.07ms 60.0°F
0.80V 10.2% 3594 0 2.30ms 60.0°F
0.80V 10.2% 2750 0 0.00ms 60.0°F
0.00V 10.2% 3219 0 0.00ms 60.0°F

You didn't capture the problem in your log.

What we see here is you backing off the throttle or you have a bad TPS. It goes from 91.4% to 10.2% in one sample and then the car is in decel mode with the injectors cut off.
You might want add MAF HZ to you logs.

Are we to assume that these are from running 15 psi on a 14B?

Steve

 

[kelvinb]

yes 15psi, when it backfired i let off.