91 240sx timing problems?

[Sileighty_Guru]

I have a bit of a problem with the timing of my 91 240sx, its getting fuel spark and air, but i cant get it to fire? upper timing chain has marks from when it was taken off (sharpie makes) when they are lined up with the cams it wont fire? have tried diffrent possitions with the cams at top dead and still nothing?any help out there?what position are the cams suposed to look like? are they suposed to be facing out on the 1st cylender and straight up and down on the 2nd and 3rd or slightly off center?so many questions!Thanks

[navysnail]

are you getting any compression

[burnin240sx]

you might want to look into my post about the same thing

http://www.nissaninfiniticlub....63112

my problem was the cams wern't exactly lines up and after i did that i had my fuel lines on backward, but it's all good now. except a knock sensor.

[Sileighty_Guru]

ya i am still tinkering with the cams, and yes i have 155-160 in each cylender!i have the same problem with knock sensor when i rebuilt motor forgot to put it back on and now cant get to it without taking off the manifold! oh well don't need it anyway! i have not used it in one year still fine without it!

[burnin240sx]

but the computer runs in "limp mode" with the knock sensor error on the ecu. you might run better with the sensor fixed or atleast a resistor in it's place.

[Sileighty_Guru]

well i frigged and frigged with it got it running (sputtering) wouuld not idle, and couldn't get the distributer set right before it just stopped.....? now all i get is nothing but a cranking motor again!*^$%@(&$#^#(^@ getting mad at this thing can ya tell!well going to take it apart again tomarrow and see what is going on!and about the counting links subject....... 14 14 and 24 equals 52 links right? well i only have 48 links so i don't think i can go by counting links!thanks anyway

[DAEDALUS]

about the counting links subject....... 14 14 and 24 equals 52 links right? well i only have 48 links so i don't think i can go by counting links!

Where did you get those numbers? If each count includes the link at each end on the sprocket teeth, then don't forget 3 links will get counted twice on a DOHC if that's the counting method. Perhaps your chain has 49 links, not 48?

[Sileighty_Guru]

i had gotten them off of another thread, but what you say seems right but i still get only 48 links gor some godly reason!lolnot to worried about it though i just got the 14 and 14 and left the rest up to the tensioner!another question though when the cams are at top dead does anyone have a pic of what they should look like? i know that on #1 they are facing the outside head walls like 9 and 3 o clock but after getting the chail right they were slightly off (both) but that was the only way i have had it that it at least sterted!

[DAEDALUS]

You're certain you can't find the original chain colorings? Should be 1 gold and 2 silver links I think, or something like that. A good light and the angle you look at them makes a difference. With all this uncertainty rotate the crank by hand 2 turns before cranking her over, to check for any interferences.

[burnin240sx]

sounds way to much like my problem. your cams are off. just take off the front cover and readjust the the chains to the proper marks. i'm willing to bet a kidney that it will start right up after you do that.

[Sileighty_Guru]

got it running today well sortof! it will stay ruynning as long as i keep my foot on the gas when it is about to stall, running rough though? any ideas on what to check for next? i'm having trouble keeping it running while i check for vacume leaks? could it be timing still?

[burnin240sx]

I’d look for leaks first. If it was timing it would be fixed with a little advance. Have you checked for codes? Also I’ve heard of the iacv was linked to idle problems but I think it may not be your problem. more then likly it's a vacume leak

Or nistech could just swoop in and tell you exactly what’s wrong and flex his supreme KA knowledge and make me crawl under a table and cry in shame of my inferior being.

[Sileighty_Guru]

ya im checking for them now also looking for a vacuum diagram but no one seems to have one for a 93 ka24de? thinking that i might have one of the little ones on the back of the head crossed? maybe bad?well thanks burning will let you know what happens!

[NISTECH]

sounds like you are either running hella rich or your machanical timing is still way off. possibly the oil pump and distributor shaft not properly indexed for TDC.

[Sileighty_Guru]

i took it up to the garage i used to work at and they helped me eliminate some things that one person just can do my himself! anyway it was seeming to run rich??? can smell it int he exhaust, especialy around 4k plus rpm's, is this the O2 sensor, kind of avoiding that one for now nobody can get one for 3 days around here! any way its runs fine under no load once you get past 2k rpm but anything lower and it will stall if you don't keep your foot on the gas but under a load same thing about stalling but also no power is getting to the groung after 3k rpm or so, feels like runnung on 3 cyl, but not really skipping? ( stock clutch on performance engine may be ****ting the bed! lolany other clues would be greatly appreciated!

btw: how do you ajust the AIR/FUEL Ratio?

[NISTECH]

you cant it is computer controled. Check your coolant temp connection closely. The O2 will not make it run that rich. leaning toward maf or coolant temp connection.

[Sileighty_Guru]

man i hate trying to get a car running last second before a show/drag! anyway i took almost every contraption possible apart and cleaned them, cleaned all connections, and it still stalls... was expection that but as far as power goes it puts it to the ground now as long as you are flooring it when you try to keep a constant speed now it stumbles untill you floor it again?Man i hate foreign electronics! lol, to much to worry about not like 350's! lol but I still love it anyway!nistech i did notice when i was cleaning that the coolant temp connection was kind of loose but still reading temp to gauge?(thats the one on the front of the engine mounted on the intake manifold right?)anyway thanks for everything so far you are a big help!show is tomarrow and drags are at night...thinnk i will stumble my way there and see what happens! (keeping AAA right close to heart! lol) no trust in myself.....

PS knock sensor has nothing to do with any of this does it? i have not had it hooked up for 2 years now ran fine before this winter! and people tell me that it will only run in limp mode if it doesn't have a signal from the sensor?

Thanks

[NISTECH]

The knock sensor [or lack of] is not causeing this problem But if it isnt hooked up it will be in limp mode. all that means is it restricts the amount of advance it will give on accel.

The coolant temp that feeds the gauge is not the same sensor that feeds the computer. The single wire black connector one is for the gauge and will have 0 effect on engine control. The red connector is your coolant temp sensor for the ecm this is the one I am reffering to. make sure the female pins in the connector are fitting tight on the terminals in the sensor it self and there is no green corrosion on it.

[Sileighty_Guru]

ok will check tomarrow thanks, raining today went to show in rain what fun!one other thing that i noticed today (in rain) that sometines when you rev it up to 5k or 5.5k this cuts out like a rev limiter? water in a sensor? maybe dis. cap?thanks

[NISTECH]

moisture will definitly have an effect on a loose conector.