1993 240sx sr20det redtop

[sd2nola]

ok, i have asked for help with my problem before. you guys have given me a lot of help. i have figured out what my car is actually doing, but i do not know the cause of it. After we hooked up a scanner to me car this is what we found...When i start to boost my timing is retarded a lot. i dont know what the numbers mean but...no boost= about 36 boost= starts to drop to 15 or lower. one time all the way to 9. i can feather the pedal and it is fine. once boost even remotly starts...timing drops dramatically. sputter, no get-up and go. The more boost, the more timing is retarted...longer i boost, the more timing is retarded. Please help me again.

Thank you!!!p.s. we were using a snap-on scanner

[180fan]

1. what's your base timing set at

[sd2nola]

no idea...i had someplace else time it and just finish the swap b/c i didnt have time to do it myself. what should it be?

[180fan]

15btdc +-2degrees

[sd2nola]

ok. if my timing is set to that then what could be the cause of what is going on and how do i fix it?

[sd2nola]

also what do you mean by +-2?

[180fan]

min 13btdc and max 17

[sd2nola]

if the timing is set where it should be...do you have an idea of why my car is doing what it is doing?

[180fan]

1. how did you check your base timing

2. if it's sputtering and not doing anything what other sensors and measurements did you take?

[sd2nola]

i used a snap-on diagnostic scan tool the only problem was: unless im wrong, because my motor wasnot in any american car, there may have been some sensors that wwere not picked up by the machine. i was told by machanic that i trust that it could be a knock sensor. other than that no idea. also i have not checked the timing yet but i will do that this weekend and let you konw what it was.