sr20det problem I can't resolve

[kryton]

Hello,I'm new to the forums, but I need some help. I have an 89 240sx with the sr20det redtop in it. It's been in the car for about 2 years but this is my second motor. The problem is I can't get the car to start. It has spark, has fuel but just sits there and cranks. I did manage to get it started once and it ran for only about 7 mins, we took it up the road and it was running really rich. Then it just died on the road, couldn't start it with the key, they only way we could get it running was to let it roll back down the hill and pop the clutch. We got it back to the garage and then it wouldn't start period, just cranks. I tried with the stock injectors, stock maf and stock ecu. I also tired with my 550 injectors tuned eproms ecu and z32 maf. They all did the same thing. I checked the timing, it didn't seem to be off. however we took the spark plugs out and they are covered with fuel since the engine is flooded. Next I took the fuel rail off to discover that the injectors are all firing at the same time, now i haven't work on cars for that long but i know thats not normal. The last attempt i made was to wire the injectors straight off the ecu and bypass the factory wiring all together, still the same problem so i'm stumped. could I maybe have a bad CAS? Any help would be greatly appreciated guys because at this point i'm seriously just thinkin about selling the car.Thank you

[biglipzit]

Ouch you bring a new meaning to the word problem... I can't jump and tell you why it isnt starting but maybe we could trouble shoot this. Have you checked to see if the engine is grounded properly? The only reason i see all injectors firing at the same time is because the ecu holds the injectors shut and breaks the ground. In other words i believe they are normally always open and if there is no ground that could hold all 4 open all the time. Someone correct me on this theory if i am wrong. That could also be the problem with the spark. The ground is too weak but maybe makes connections some of the time and most of the time there is no ground connecting. That is just a small guess so far. I can continue to try to help for sure.

[Titanium]

Bad fuel pressure regulator?

[TheLocust]

Biglipzit is correct, the FPR is not bad its a ground. My car had the EXACT same problem, my car is a 90 with a redtop. I could get my car to start though, I just had to crank it and give it a tad of gas. It'd run really rough and it definately ran rich. I took it to a local tuning shop because I could NOT figure out what was wrong with it, spent weeks trying. Spent a lot of money on parts that I did not need after I found out it was a wiring problem. My car was a bad "chassis ground". What we did was just bypass the shorted out wire, put a new wire in and voila. What really pissed me off is I spent a lot of cash paying a shop to wire my car so I didn't have to worry about wiring issures...the more I think about it the more I think I just would have been better off doing it myself.

[NY S13 SR]

Probably your injector o-rings are leaking fuel into the cyls past the injectors. Pull the fuel rail with injectors it in off the intake, then turn the key to RUN to get fuel pressure. If any fuel drips out that is a problem, you may have a pinched o-ring. Very common.

Also make sure you check your oil for fuel, if you drive around with fuel-diluted oil you will spin a bearing.

A flooded engine is almost impossible to start, this could explain almost all your problems.

_________________Jeff Hhttp://www.heavythrottle.com

[kryton]

hey guys,thank you for the responses, i'm gonna try to rework my grounds and see if i had a bad connection there because all the injectors are definitly firing at the same time. I also need to change the oil because i did smell some gas in it, and i sure don't want a spun bearing. I'll report back when I get a second to work on itThanks again guysNigel

[biglipzit]

no problem and keep us posted for sure.

[kryton]

well,we tired a bunch of different things and we still get the same problem, We even put the stock injectors back in and made everything just like factory and we can't get the damn thing to start. The injectors fire all at the same time. We changed all the grounds, made sure they were all good. So my next question is could the CAS be bad? also where are the ground for the injectors, i know there is two spots on the intake manifold and another ground that comes off the back of the block to the fire wall, is there any others that I missed that could be related to the injectors? See what you can come up with guys because i'm really getting tired of this. I just want my car to run

thanks again

[SpeedRacer1]

When all four injectors fire, it means the ECU is in fail safe mode. Also all the injectors fire when the car is being started up. Its called simultaneous multiport fuel injection.

[kryton]

so then, if they are supposed to fire all at the sametime on start, I wonder why the engine is flooding, i'm gonna try to see if the injectors are leakin again.

[kryton]

can anyone tell me the right procedure to get the fault codes from my ecu, it's a 62. i know you have the dial on the ecu but for some reason the last couple times i've tried to get the light on the ecu to flash it doesn't. let me know

[s14brent]

try swap CAS, i had the same problem, crank, no start. didnt check as far as the injectors, but i did check maf signal, spark, etc. but it fired right up afterwards.

[Hijacker]

sounds like ignition timing is 180 off.

[Dori Dori]

Did this problem ever get resolved? I'm having the same issue now...

[gsxrbg]

i am having the same problem the car cranks ,has fuel,has spark,still wont start , im wondering if its not getting good enough ground,(i sent the wiring harness out to be done so i know its right ,i have the ground on the firewall to the back of the engine, the neg cable from the batt. to the frame,the 2 on the intake (by the injectors) am i missing any,also the two plugs that go to the pos. cable on the battery ,what should you do to give these power, my batt is in the trunk, thanks in advance

brian

[biglipzit]

Could it be possible that you all have faulty ecu's or very very bad timing. Have any of you taken a timing light to check the timing of your engine? It could be so many small things like that. The wiring could be wrong somewhere causing the ecu to fire the injectors and spark plugs wrongly...

[gsxrbg]

the ecu and ignigtor chip are both good,i tried them on my buddys car,how can i check the timing if it doesnt start,also the tube that goes into the coldpipe right befor the throttle body does that have to be hooked up for the car to start or will the car start without it (even though it will run like crap)because i made my i/c piping and i didnt cut the hole for that yet, that wouldnt cause the car to not start would it???

[Dori Dori]

OK figured out my problem...#3 injector was spraying full spray at idle while 1,2, and 4 were pulsing just fine. I took the fuel rail out and turned the ignition to the on position to check for leaks, then started (for a split second) to see what was going on. ECU is fine, timing is fine, engine grounds are fine, and so are all the sensors. Turns out something happened to the wiring harness...the ground for the #3 injector got cut somewhere. We wired the #3 injector straight to the ecu and it started pulsing like all the others. We're gonna rebuild the entire harness now just to be safe.
Modified by Dori Dori at 9:12 PM 7/5/2005

[redsx13]

I'm having the same problem, car flooding on startup, when I pull the fuel pump fuse I could get it to start for about 4 seconds until the rail runs out of gas. Put the fuse back in and it floods. Pull the fuse and it starts again for about 4 seconds. Repeat....

[Hijacker]

I'm having the same problem, car flooding on startup, when I pull the fuel pump fuse I could get it to start for about 4 seconds until the rail runs out of gas. Put the fuse back in and it floods. Pull the fuse and it starts again for about 4 seconds. Repeat....

Find your fuel pressure and make sure you don't have a stuck injector.