HELP!, SR is undriveable My A/F ratio is all over the place!!*****Got VIDEOS!*** - Page 2 - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

redsx13 · 03-01-2009, 09:58 PM

Quote:

Originally Posted by blackej7

have you done a compression/leakdown test?

compresion is 150-150-150-149, no leakdown test, but i did do a boost leak test.

Quote:

Originally Posted by blackej7

Cant you monitor data with the power fc? check all your values, make sure everything is normal.

i can if i knew what normal was.

910noskillz · 03-02-2009, 06:58 AM

sounds like a timing issue to me.....it doesnt sound the same as a boost leak, it would be pegged rich if it was after the maf......

i would check into the timing more

mbmbmb23 · 03-02-2009, 09:32 AM

FPR taking a dump?

910noskillz · 03-02-2009, 11:54 AM

could also be a fuel related issue!

redsx13 · 03-02-2009, 02:23 PM

Quote:

Originally Posted by 910noskillz

sounds like a timing issue to me.....it doesnt sound the same as a boost leak, it would be pegged rich if it was after the maf......

i would check into the timing more

i will check into it..

btw, i have a new nismo fpr and my fuel pressure at idle is around 40psi (normal).

godsmack · 03-02-2009, 02:41 PM

take valve cover off put motor at tdc check make sure the cams r timed right. like someone else said you might of jumped a tooth w/ the chain being loose and all. the cams gears have a dot and the chain has silver links that they line up with.

redsx13 · 03-02-2009, 03:27 PM

that's actually what i did, but i found something really strange.
http://zilvia.net/f/s-chassis/243284...cs-inside.html

p.s. i noticed you already commented on it, when you get home check those pics out and tell me what you think.

blackej7 · 03-02-2009, 05:16 PM

Quote:

Originally Posted by 910noskillz

sounds like a timing issue to me.....it doesnt sound the same as a boost leak, it would be pegged rich if it was after the maf......

i would check into the timing more

If there was a vacuum leak after the MAF, o2 sensor would read lean. but hes map based, so a vacuum leak will simulate a load/raise idle.

Why dont you post up all the parameters you can monitor with the power-fc? and well go over em?

edit:

whoa, you have aftermarket cams too?

COMPLETE mod list please... lol...

redsx13 · 03-03-2009, 02:10 AM

Quote:

Originally Posted by blackej7

If there was a vacuum leak after the MAF, o2 sensor would read lean. but hes map based, so a vacuum leak will simulate a load/raise idle.

Why dont you post up all the parameters you can monitor with the power-fc? and well go over em?

edit:

whoa, you have aftermarket cams too?

COMPLETE mod list please... lol...

ya...... i gotta swap those thing out, gonna throw some stock ones in, i will post up the parameters soon.

the ideal would be to have the car completely stock and then go off of that. I'm thinking i can leave the pfc though because it has a base tune that is the same as stock.

godsmack · 03-03-2009, 08:40 AM

Quote:

Originally Posted by redsx13

that's actually what i did, but i found something really strange.
http://zilvia.net/f/s-chassis/243284...cs-inside.html

p.s. i noticed you already commented on it, when you get home check those pics out and tell me what you think.

did you try to keep spinning the motor to see if the links or way off? if that's the case then you may have to pull a bunch of shit off to either get them right or hope that they're right and try to find something else but i think that this is the problem now. other thing you can do is degree the cams once it's at tdc and say fuck the links.

redsx13 · 03-03-2009, 12:35 PM

Quote:

Originally Posted by godsmack

did you try to keep spinning the motor to see if the links or way off? if that's the case then you may have to pull a bunch of shit off to either get them right or hope that they're right and try to find something else but i think that this is the problem now. other thing you can do is degree the cams once it's at tdc and say fuck the links.

i haven't checked, but as soon as i pull the valve cover again i will.

ooooo, how do i degree the cams at tdc???

jilo · 03-11-2009, 08:14 AM

check for that vacuum leak, spray a can of brake cleaner all over the engine and if the idle raises you have a vacuum leak.
i know a vac leak was suggested but nobody ever told you how to do it properly

Sileighty_85 · 03-11-2009, 04:11 PM

Dude it seems like when some pulled off the cams they fucked up the mechaincal timing

Those white dots were for the person to line the sprockets marks back up, but they probably dropped the chain.

You have basically replaced all the electronic shit on that damn engine.

Pull the engine and redo the Mechanical timing with OEM SR cams Per FSM

blackej7 · 03-12-2009, 03:36 PM

Quote:

Originally Posted by jilo

check for that vacuum leak, spray a can of brake cleaner all over the engine and if the idle raises you have a vacuum leak.
i know a vac leak was suggested but nobody ever told you how to do it properly

........ or he can just look at his boost gauge and make sure it idles at the right vacuum, since he has a MAP sensor.

Ca_Silvia · 03-13-2009, 03:44 PM

Few things, its already been established that your fuel pressure is 3psi low. (40 vrs 43)

Secondly, when you put in your "stock" injectors did you clean/flow test them? IMO it sounds like you have dirty ass injectors throughing an odd spray pattern in to the chamber.

Lastly, i had similar symptoms then i changed out my o2 and it was all good after. Especially if you are holding your rpms steady, thats when the o2 tries to adjust everything leaner as opposed to WOT.

redsx13 · 03-16-2009, 11:44 PM

Quote:

Originally Posted by Sileighty_85

Dude it seems like when some pulled off the cams they fucked up the mechaincal timing

Those white dots were for the person to line the sprockets marks back up, but they probably dropped the chain.

You have basically replaced all the electronic shit on that damn engine.

Pull the engine and redo the Mechanical timing with OEM SR cams Per FSM

ya that's my next step, but i really don't want to pull the oil pump

It actually runs decent in the higher rpms though, if it was a tooth off wouldn't it run really really bad?

redsx13 · 03-16-2009, 11:52 PM

Quote:

Originally Posted by Ca_Silvia

Few things, its already been established that your fuel pressure is 3psi low. (40 vrs 43)

Secondly, when you put in your "stock" injectors did you clean/flow test them? IMO it sounds like you have dirty ass injectors throughing an odd spray pattern in to the chamber.

Lastly, i had similar symptoms then i changed out my o2 and it was all good after. Especially if you are holding your rpms steady, thats when the o2 tries to adjust everything leaner as opposed to WOT.

ya, i was thinking o2, but the car searches up and down whether it is plugged in or not. when its plugged in the car misses, but when i unplug it the missing stops.wtf

vortxxe · 03-17-2009, 10:41 AM

you can't "drop the chain" on an sr. There are little knobs that stick out of the front cover that prevent the timing chain from coming far enough off the crank sprocket to actually skip a tooth. Pretty smart move by nissan.

Anyhow, it quite likely sounds like either your ignition timing, or mechanical timing is out of whack. Have you verified the CAS is calibrated correctly/installed correctly?

redsx13 · 03-17-2009, 11:29 PM

Quote:

Originally Posted by vortxxe

you can't "drop the chain" on an sr. There are little knobs that stick out of the front cover that prevent the timing chain from coming far enough off the crank sprocket to actually skip a tooth. Pretty smart move by nissan.

no way! that is the best news i have heard all day!

as far as the CAS, 2 CAS's (both the one that came on the car and one i bought from zilvia) do the same thing. ign timing is 15* btdc and my apexi power fc verifies these numbers as well.

03-02-2009, 09:32 AM	#33
mbmbmb23 Zilvia Contributor Join Date: Oct 2001 Location: Charlotte, NC. Posts: 1,776 Trader Rating: (1) Rides Gallery: mbmbmb23 Feedback Score: 1 reviews	FPR taking a dump? __________________ 400x200

03-11-2009, 08:14 AM	#42
jilo Zilvia Junkie Join Date: Jun 2006 Location: ct Posts: 312 Trader Rating: (2) Feedback Score: 2 reviews	check for that vacuum leak, spray a can of brake cleaner all over the engine and if the idle raises you have a vacuum leak. i know a vac leak was suggested but nobody ever told you how to do it properly __________________ "just throw in like 8 packs of BBs and do a burnout. DIY shot peen, done and done."

03-11-2009, 04:11 PM	#43
Sileighty_85 Post Whore! Join Date: Dec 2006 Location: Misawa, Japan Posts: 6,815 Trader Rating: (8) Feedback Score: 8 reviews	Dude it seems like when some pulled off the cams they fucked up the mechaincal timing Those white dots were for the person to line the sprockets marks back up, but they probably dropped the chain. You have basically replaced all the electronic shit on that damn engine. Pull the engine and redo the Mechanical timing with OEM SR cams Per FSM __________________ 後輪駆動車１番 1989 Built SR GT2871R -363whp 1998 S14 W/RB25- 250ish (For Now) 1986 SR86 - 200ish 1990 R32 GTR - 320hp Don't Buy Engines from JDM-Online http://zilvia.net/f/businesses/207457-jdm-online.html Don't Buy XS-Power or SSAC Shit

03-13-2009, 03:44 PM	#45
Ca_Silvia Leaky Injector Join Date: Oct 2006 Location: The cold north Posts: 71 Trader Rating: (0) Feedback Score: 0 reviews	Few things, its already been established that your fuel pressure is 3psi low. (40 vrs 43) Secondly, when you put in your "stock" injectors did you clean/flow test them? IMO it sounds like you have dirty ass injectors throughing an odd spray pattern in to the chamber. Lastly, i had similar symptoms then i changed out my o2 and it was all good after. Especially if you are holding your rpms steady, thats when the o2 tries to adjust everything leaner as opposed to WOT. __________________ Drift cars have no business being practical, fast, or functional.

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03-02-2009, 06:58 AM	#32
910noskillz Join Date: Mar 2009 Location: Wilm NC Age: 31 Posts: 47 Trader Rating: (0) Feedback Score: 0 reviews	sounds like a timing issue to me.....it doesnt sound the same as a boost leak, it would be pegged rich if it was after the maf...... i would check into the timing more

03-02-2009, 11:54 AM	#34
910noskillz Join Date: Mar 2009 Location: Wilm NC Age: 31 Posts: 47 Trader Rating: (0) Feedback Score: 0 reviews	could also be a fuel related issue!

03-02-2009, 02:41 PM	#36
godsmack Zilvia Addict Join Date: Feb 2009 Location: Allentown, PA Age: 36 Posts: 652 Trader Rating: (0) Feedback Score: 0 reviews	take valve cover off put motor at tdc check make sure the cams r timed right. like someone else said you might of jumped a tooth w/ the chain being loose and all. the cams gears have a dot and the chain has silver links that they line up with.

03-02-2009, 03:27 PM	#37
redsx13 Zilvia Junkie Join Date: Jan 2009 Location: Agoura Hills, Ca Age: 31 Posts: 572 Trader Rating: (6) Feedback Score: 6 reviews	that's actually what i did, but i found something really strange. http://zilvia.net/f/s-chassis/243284...cs-inside.html p.s. i noticed you already commented on it, when you get home check those pics out and tell me what you think.

03-17-2009, 10:41 AM	#48
vortxxe Join Date: Mar 2007 Location: Comox, BC, Canada Age: 32 Posts: 37 Trader Rating: (0) Feedback Score: 0 reviews	you can't "drop the chain" on an sr. There are little knobs that stick out of the front cover that prevent the timing chain from coming far enough off the crank sprocket to actually skip a tooth. Pretty smart move by nissan. Anyhow, it quite likely sounds like either your ignition timing, or mechanical timing is out of whack. Have you verified the CAS is calibrated correctly/installed correctly?