gyd23
10+ Year Contributor
- 54
- 0
- Mar 17, 2011
-
Mountain Home,
Idaho
alright so i will try to make this as short as i can.. what i have is:
a 97 gsx with DSMLink v2, G4CS swap, SCM61 turbo, FP3 cams, built motor and supporting mods to handle all that... and for the last year the car has sat-not been touched, until the guy i bought it from put in a new motor about a week before i bought it and he literally put like 50 miles on it to get a good pre-lim tune on it.
i drove it after i bought it without any problems for the other 400 some miles to finish breaking in the new parts in the bottom end (only the rods and crank were replaced, everything else was already prior broke in)
..then right about that mark i threw my timing belt because the post that the tensioner arm rotates on for the timing belt decided to walk itself out of the MM and i bent 12 out of 16 valves
so i fixed that but in the process since these motors are pretty new to me and i didn't know how the ignition timing works with the CAS and supposedly the water temp sensor and all that, i just "bolted the CAS back on about where it looked like it went (whoops)" put it together and drove it another 100 miles and got it tuned at Pure Tuning, in toledo, OH.
now keep in mind the 100 miles i put on it, and during the tuning session which the guy did about 5 pulls on it to tune it at 19psi and all was fine. she ran pretty good. (he couldn't get it to idle right because the guy i bought it from took of the IAC, why is beyond me but he did and said it should run fine, but thats a different issue.)
until.. he went to 24psi to get it tuned to that, and it immediately blew one of the incorrectly gapped platinum plugs in there, he replaced them with proper NGK iridiums i believe, don't remember off the top of my head. but the very next pull the car didn't get about 4500 RPM without missfiring. and same thing over and over for another couple pulls after we tried swapping coil pack, and wires.
so i accepted the tune at 19psi and drove home, got home (an hour of driving later) got on the throttle a bit and it didn't missfire at all. (hmm weird.)
now the tuner from Pure Tuning said that he KNOWS its something ignition related. so the very next day i go out to start it and hmm car won't start. my buddy comes over and we hook up DSMLink, check everything over which appears to look good (except i dont' remember what the timing said) but we played with it a little bit and it eventually started. and then tried to punch it and it didn't get about 4k RPM without missfiring. (IIRC every time its missfired my CEL has come on due to a disruption in the water temp sensor circuit which ive narrowed down to a loose or bad wire somewhere)
so went back to what Keith said about the ignition, i changed the ignition control module (ignitor plug) with no avail. only other thing to my knowledge would be the CAS (other than the whole CEL from the water temp circuit thing) and the 2 days after tuning it when we got it to start up, at idle, or around 1100 RPM the timing jumps from 5 to 13 degrees, now since im not too knowledgeable with the ignition system i would just guess this is not good. when the cars warm it jumps like that, and when warm at 1500RPM jumps between 13 and 22 also about 2k RPM it jumps between 22 and 28.
is this okay?
...the 3rd day after getting it tuned i go outside to start it up and it starts right up. (sputters at first and sounds like its firing on 3 cyl for about 10 sec then smooths out).
the 4th day, doesn't start at all. tried it numerious times throughout the day.
the 5th day, starts right up, sputters like before for 10 to 15sec then smooths out. (and when driving still missfires at round 4k RPM or when getting into boost.)
and thats where im at, any ideas?
now what i need help on figuring out is exactly how to time (mostly the base timing) the CAS, i know base timing is 5* ..and i was told by the tuner i should tim it at 10* for base timing. once again i don't know much in this field and have no idea how to do "base timing" for the CAS, i know to adjust the timing on it all you do is loosen the nuts and spin it either clockwise a little or counter clockwise. but i have no clue what my base timing is at right now and don't know how to set it. since i have adjustable cam gears, since im guessing, is that all i would do is advance my intake cam 5* and thats the base timing for it?
THANKS all for the help and i apologize for the longest post in history.
a 97 gsx with DSMLink v2, G4CS swap, SCM61 turbo, FP3 cams, built motor and supporting mods to handle all that... and for the last year the car has sat-not been touched, until the guy i bought it from put in a new motor about a week before i bought it and he literally put like 50 miles on it to get a good pre-lim tune on it.
i drove it after i bought it without any problems for the other 400 some miles to finish breaking in the new parts in the bottom end (only the rods and crank were replaced, everything else was already prior broke in)
..then right about that mark i threw my timing belt because the post that the tensioner arm rotates on for the timing belt decided to walk itself out of the MM and i bent 12 out of 16 valves
so i fixed that but in the process since these motors are pretty new to me and i didn't know how the ignition timing works with the CAS and supposedly the water temp sensor and all that, i just "bolted the CAS back on about where it looked like it went (whoops)" put it together and drove it another 100 miles and got it tuned at Pure Tuning, in toledo, OH.
now keep in mind the 100 miles i put on it, and during the tuning session which the guy did about 5 pulls on it to tune it at 19psi and all was fine. she ran pretty good. (he couldn't get it to idle right because the guy i bought it from took of the IAC, why is beyond me but he did and said it should run fine, but thats a different issue.)
until.. he went to 24psi to get it tuned to that, and it immediately blew one of the incorrectly gapped platinum plugs in there, he replaced them with proper NGK iridiums i believe, don't remember off the top of my head. but the very next pull the car didn't get about 4500 RPM without missfiring. and same thing over and over for another couple pulls after we tried swapping coil pack, and wires.
so i accepted the tune at 19psi and drove home, got home (an hour of driving later) got on the throttle a bit and it didn't missfire at all. (hmm weird.)
now the tuner from Pure Tuning said that he KNOWS its something ignition related. so the very next day i go out to start it and hmm car won't start. my buddy comes over and we hook up DSMLink, check everything over which appears to look good (except i dont' remember what the timing said) but we played with it a little bit and it eventually started. and then tried to punch it and it didn't get about 4k RPM without missfiring. (IIRC every time its missfired my CEL has come on due to a disruption in the water temp sensor circuit which ive narrowed down to a loose or bad wire somewhere)
so went back to what Keith said about the ignition, i changed the ignition control module (ignitor plug) with no avail. only other thing to my knowledge would be the CAS (other than the whole CEL from the water temp circuit thing) and the 2 days after tuning it when we got it to start up, at idle, or around 1100 RPM the timing jumps from 5 to 13 degrees, now since im not too knowledgeable with the ignition system i would just guess this is not good. when the cars warm it jumps like that, and when warm at 1500RPM jumps between 13 and 22 also about 2k RPM it jumps between 22 and 28.
is this okay?
...the 3rd day after getting it tuned i go outside to start it up and it starts right up. (sputters at first and sounds like its firing on 3 cyl for about 10 sec then smooths out).
the 4th day, doesn't start at all. tried it numerious times throughout the day.
the 5th day, starts right up, sputters like before for 10 to 15sec then smooths out. (and when driving still missfires at round 4k RPM or when getting into boost.)
and thats where im at, any ideas?
now what i need help on figuring out is exactly how to time (mostly the base timing) the CAS, i know base timing is 5* ..and i was told by the tuner i should tim it at 10* for base timing. once again i don't know much in this field and have no idea how to do "base timing" for the CAS, i know to adjust the timing on it all you do is loosen the nuts and spin it either clockwise a little or counter clockwise. but i have no clue what my base timing is at right now and don't know how to set it. since i have adjustable cam gears, since im guessing, is that all i would do is advance my intake cam 5* and thats the base timing for it?
THANKS all for the help and i apologize for the longest post in history.
