smbgsx
Proven Member
- 225
- 42
- Apr 15, 2017
-
Richfield,
Minnesota
1995 gsx
fp2 cams
6-bolt magnus bottom end (compression test yesterday: All cylinders = 95psi first crank, 168-175psi after 5 cranks. throttle 100% open.)
fp3052 turbo (garret gt3076 with different hotside)
external wg with dump pipe
coil on plug conversion (no ignition box)
front mount
id1700's
3" catless
ecm v3 with SD setup.
e85 tuned
cant find any vacuum leaks.
I don't have a boost leak tester, but I cannot visually find any boost leaks. all clamps tight and couplers intact.
fluids look appropriate (no coolant in oil etc...)
I do have a exhaust leak in my header around my egt gauge bung, im not sure how to fix it at this point. I've tried sealing it like 3 times. that lasts about 3 weeks.
I unplugged coils one at a time they all contribute evenly.
I disabled injectors one at a time they all contribute evenly.
I don't have an oscilloscope. I wish I could see what my ckp and cas were doing, see what my coils were doing. but I cannot.
I recently did timing belt with mistu pulleys and tensioner, gates racing belt. all the timing marks appear to line up although I feel like the idle got weak after the timing belt. but it ws starting to develop cold start issues and wouldn't hold idle as well as it once did shortly prior to the belt R&R. so I not sure if they're related or not.
noticed my throttle cable has a strand that is broken and un wound slightly, don't know if that would effect anything.
My issue is a weak idle and stalling at times when coming off throttle to idle. it is less prone to stalling after warming past 122-degrees or so, but its still weak and fluctuates.
It seems like sometimes it idles at the correct target rpm, but its just not strong there. if I snap the throttle there is a bog down to near 400 rpm and then bounces around. If I open the throttle really quick I can get it to stall. If I ease the throttle and get past around 1500 rpm I can pretty much do whatever. It does idle around 800 when warm which is not its target.
The car cruises fine and still rips hard. it does have a small intermittent miss at idle but it always has. my wideband recently took a shit so all I have is a narrowband gauge. it is a brand new sensor and it tells me im idling rich of stoich at all times. fuel base pressure is set to about 43 and is running around 37-38 with the vacuum line hooked up. my boost gauge says im idling at 15 in/hg, which I feel is lower than it used to be. I used to be around 17-18. but my idle was higher then too. my ecu target idle has always been 1100, but I was typically really around 1300. I just did my timing belt and im not sure if this issue was related. cold start is way better since the timing belt, but my idle stability has gotten worse. but it was deteriorating already before I did the timing belt and many mornings it wouldn't want to move until I got some heat in it and then ripped it hard one time. then it would drive normal. Now its starts better, but the stumble on wot from low rpm never really goes away. just to see what happened I advanced both cams 4 degrees and ran it. no change. I retarded both cams 4 degrees and no change. I did notice that my intake cam didn't want to move on its own like my exhaust cam does after loosening the cam gear set bolts. I looked under my valve cover after doing my belt and didn't see anything of note. so I don't know maybe my cam was just in a spot where the springs didn't want to rotate it?
I do have logs, don't know if it will help. One is all idle and throttle manipulation. the other is my start-up and drive to work. I hit 150mph in that log at some point. please don't judge me .
any help or direction would be appreciated.
fp2 cams
6-bolt magnus bottom end (compression test yesterday: All cylinders = 95psi first crank, 168-175psi after 5 cranks. throttle 100% open.)
fp3052 turbo (garret gt3076 with different hotside)
external wg with dump pipe
coil on plug conversion (no ignition box)
front mount
id1700's
3" catless
ecm v3 with SD setup.
e85 tuned
cant find any vacuum leaks.
I don't have a boost leak tester, but I cannot visually find any boost leaks. all clamps tight and couplers intact.
fluids look appropriate (no coolant in oil etc...)
I do have a exhaust leak in my header around my egt gauge bung, im not sure how to fix it at this point. I've tried sealing it like 3 times. that lasts about 3 weeks.
I unplugged coils one at a time they all contribute evenly.
I disabled injectors one at a time they all contribute evenly.
I don't have an oscilloscope. I wish I could see what my ckp and cas were doing, see what my coils were doing. but I cannot.
I recently did timing belt with mistu pulleys and tensioner, gates racing belt. all the timing marks appear to line up although I feel like the idle got weak after the timing belt. but it ws starting to develop cold start issues and wouldn't hold idle as well as it once did shortly prior to the belt R&R. so I not sure if they're related or not.
noticed my throttle cable has a strand that is broken and un wound slightly, don't know if that would effect anything.
My issue is a weak idle and stalling at times when coming off throttle to idle. it is less prone to stalling after warming past 122-degrees or so, but its still weak and fluctuates.
It seems like sometimes it idles at the correct target rpm, but its just not strong there. if I snap the throttle there is a bog down to near 400 rpm and then bounces around. If I open the throttle really quick I can get it to stall. If I ease the throttle and get past around 1500 rpm I can pretty much do whatever. It does idle around 800 when warm which is not its target.
The car cruises fine and still rips hard. it does have a small intermittent miss at idle but it always has. my wideband recently took a shit so all I have is a narrowband gauge. it is a brand new sensor and it tells me im idling rich of stoich at all times. fuel base pressure is set to about 43 and is running around 37-38 with the vacuum line hooked up. my boost gauge says im idling at 15 in/hg, which I feel is lower than it used to be. I used to be around 17-18. but my idle was higher then too. my ecu target idle has always been 1100, but I was typically really around 1300. I just did my timing belt and im not sure if this issue was related. cold start is way better since the timing belt, but my idle stability has gotten worse. but it was deteriorating already before I did the timing belt and many mornings it wouldn't want to move until I got some heat in it and then ripped it hard one time. then it would drive normal. Now its starts better, but the stumble on wot from low rpm never really goes away. just to see what happened I advanced both cams 4 degrees and ran it. no change. I retarded both cams 4 degrees and no change. I did notice that my intake cam didn't want to move on its own like my exhaust cam does after loosening the cam gear set bolts. I looked under my valve cover after doing my belt and didn't see anything of note. so I don't know maybe my cam was just in a spot where the springs didn't want to rotate it?
I do have logs, don't know if it will help. One is all idle and throttle manipulation. the other is my start-up and drive to work. I hit 150mph in that log at some point. please don't judge me .
any help or direction would be appreciated.
Attachments
Last edited: