rebuilt SR won't run?!?! - Page 2 - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

aNskY · 03-30-2009, 06:54 AM

is your coilpack harness grounded to the back of the head?

Sileighty_85 · 03-30-2009, 09:04 AM

Do Cel codes still work on the Enthalpy Tuned ECU's?

Sounds like the CAS is bad, try swapping it with a known good one

greenman100 · 03-30-2009, 09:13 AM

Quote:

Originally Posted by Sileighty_85

Do Cel codes still work on the Enthalpy Tuned ECU's?

Sounds like the CAS is bad, try swapping it with a known good one

they do for me.

whitesileighty · 03-30-2009, 09:39 AM

I haven't checked compression yet, but with the BC springs on the valves it's a real bitch to turn over with a wrench without removing the spark plugs, so I know it's got compression. I'll run the test on it tonight, I've got no doubt that it's got compression though, and plenty of it.

I tried opening the throttle a little bit while starting it and it didn't start, so I guess that rules out the IACV. And when I tested the ignitor from a friend I also borrowed his coilpack harness, so both of those have been ruled out. I'll post compression after I test tonight.

godsmack · 03-30-2009, 09:47 AM

Besides for the obvious did you happen to clean you're plugs after the first initial start up? When i swapped my motor out i had the same problem happen to me and i cleaned my plugs and it fired right up. Might not be ur problem but just something to shoot for if you haven't already tried it.

whitesileighty · 03-30-2009, 10:03 AM

They were brand new plugs originally, and I keep cleaning them every time I pull them out. They're covered in blackened fuel when I pull them out.

godsmack · 03-30-2009, 10:20 AM

When you swapped out the ignitor and harness did you check to see if you had the same firing symptoms? You're spark isn't keeping up with the fuel. swap in stock injectors see if it will fire with less fuel.

whitesileighty · 03-30-2009, 11:09 AM

Tried that too. No go. I swapped the battery and am now getting constant spark when I test, so it's just problem after problem. Currently constant spark plenty of fuel, doesn't come any closer to starting when the stock 370cc injectors are in that when the 740cc injectors are in.

whitesileighty · 03-30-2009, 12:11 PM

Oh and yes, the coilpack harness is ground to the back side of the head. It was a pain in the arse to remove the ground to test the second coilpack harness because of the bolt location. I not only tested the coilpack harness by installing it and testing, I also used a multimeter and figured out there were no issues with it.

whitesileighty · 03-30-2009, 02:05 PM

Let me phrase another way to see if I can get some more ideas. Assuming a car is running name the sensors that would prevent it from starting again once you shut it off. TPS, MAFS, IACV (if it completely died), CAS? Any others? Cause I'm thinking coolant sensor, oil pressure, O2, knock, and any others shouldn't keep it from starting, maybe from running well, but it should still start.

I haven't looked at the TPS so maybe I'll see if I can figure out how to test it to be able to see if that's causing the issue since I've ruled out the other 3.

godsmack · 03-30-2009, 03:54 PM

well tps could be it since you're getting fuel and spark. so now it has to be an air problem. so i guess take off the intake mani and tb clean everything up just take off upper mani though. and also clean the iacv up real good.

godsmack · 03-30-2009, 03:55 PM

and cas would also not let it start but usually that deals with the spark side i'm pretty sure.

greenman100 · 03-30-2009, 06:02 PM

Quote:

Originally Posted by whitesileighty

I haven't checked compression yet, but with the BC springs on the valves it's a real bitch to turn over with a wrench without removing the spark plugs, so I know it's got compression. I'll run the test on it tonight, I've got no doubt that it's got compression though, and plenty of it.

I tried opening the throttle a little bit while starting it and it didn't start, so I guess that rules out the IACV. And when I tested the ignitor from a friend I also borrowed his coilpack harness, so both of those have been ruled out. I'll post compression after I test tonight.

Check your compression.

whitesileighty · 03-30-2009, 08:53 PM

alrighty... pulled the fuel rail and pressurized it without it being mounted, placed plastic bags over the ends of the injectors. Then turned the motor over, each injector was shooting fuel so everything is good there.

I have no idea what compression should be on a brand new rebuild before the rings have had a chance to seat (it's not started once since rebuild). Then the BC 264/264 cams have overlap so that drops the compression numbers some more. Then I have the 1.01mm headgasket too so down the number goes a little more. But I'm 110psi across the board. I'm doubtful that it should be higher seeing as the rings haven't had a chance to seat and the above info. I poured a little oil in #1 and tested again to get a better seal and I'm at 130psi

Almost forgot to mention I live in Denver, so at this altitude I'll never get 150psi. The air is too thin for sea level compression.

The ECU is throwing the 55 code (nothing wrong). I tested all the sensors with a multimeter and everything seems right except the O2 sensor, and I don't know what it should be, but voltage seemed really low compared to the other sensors. But the CAS, TPS, MAFS, and coolant sensors are all in the ranges they should be. And an O2 sensor shouldn't keep it from starting.

yokotavia · 03-30-2009, 09:53 PM

replace your coil pack harness and maybe your coil packs.

your not getting spark.
your not getting spark.
your not getting spark.

well at least the right amount of spark..

your saying its not starting and your plugs are soaked with unburnt fuel. thats a coilpack/spark issue

borrow those from a friend and test it.

its not compression.
its not the ecu
its not timing if your as right as you think

check out the sparkplug/ignitor/coilpack/coilpack harness/coilpack ground

*fliprayzin240sx* · 03-31-2009, 06:35 AM

Stab in the dark...but is your fuel line in properly? As in you didnt crossed them? Check that (best way to remember it, line from the fuel filter NOT to the regular), then id say check the compression to make sure it wasnt the rebuild.

whitesileighty · 03-31-2009, 07:08 AM

Quote:

Originally Posted by yokotavia

its not timing if your as right as you think

Heh, I did post pics and no one else has told me I'm off there either.

Quote:

Originally Posted by yokotavia

check out the sparkplug/ignitor/coilpack/coilpack harness/coilpack ground

Already tested the plugs/ignitor/coilpack harness/coilpack ground. I guess I'll borrow someone's coilpacks, but I am pretty sure this is a larger issue. Once I replaced the battery, I have constant spark now.

Quote:

Originally Posted by fliprayzin240sx

Stab in the dark...but is your fuel line in properly? As in you didnt crossed them? Check that (best way to remember it, line from the fuel filter NOT to the regular), then id say check the compression to make sure it wasnt the rebuild.

Yes, fuel lines are correct.

greenman100 · 03-31-2009, 06:54 PM

basically all that's left is the ECU, CAS, and wiring in between.

slamed_s13 · 04-26-2009, 11:32 PM

Any progress? Did you ever figure out the problem whitesileighty?

whitesileighty · 11-10-2010, 11:06 PM

I had to look up this post because a friend wanted to know my pre-starting compression numbers for troubleshooting his car.

Just to update the problem was that the exhaust cam snapped in 3 pieces before it ever started. Apparently it was damaged in shipping or something. When I installed I was staring at the shop manual torquing everything to spec in order so I know I didn't screw it up. Once I threw stock cams in it started right up.

03-30-2009, 09:04 AM	#32
Sileighty_85 Post Whore! Join Date: Dec 2006 Location: Misawa, Japan Posts: 6,815 Trader Rating: (8) Feedback Score: 8 reviews	Do Cel codes still work on the Enthalpy Tuned ECU's? Sounds like the CAS is bad, try swapping it with a known good one __________________ 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

03-30-2009, 08:53 PM	#44
whitesileighty Join Date: Mar 2005 Location: Denver Age: 39 Posts: 27 Trader Rating: (0) Feedback Score: 0 reviews	alrighty... pulled the fuel rail and pressurized it without it being mounted, placed plastic bags over the ends of the injectors. Then turned the motor over, each injector was shooting fuel so everything is good there. I have no idea what compression should be on a brand new rebuild before the rings have had a chance to seat (it's not started once since rebuild). Then the BC 264/264 cams have overlap so that drops the compression numbers some more. Then I have the 1.01mm headgasket too so down the number goes a little more. But I'm 110psi across the board. I'm doubtful that it should be higher seeing as the rings haven't had a chance to seat and the above info. I poured a little oil in #1 and tested again to get a better seal and I'm at 130psi Almost forgot to mention I live in Denver, so at this altitude I'll never get 150psi. The air is too thin for sea level compression. The ECU is throwing the 55 code (nothing wrong). I tested all the sensors with a multimeter and everything seems right except the O2 sensor, and I don't know what it should be, but voltage seemed really low compared to the other sensors. But the CAS, TPS, MAFS, and coolant sensors are all in the ranges they should be. And an O2 sensor shouldn't keep it from starting. Last edited by whitesileighty; 03-31-2009 at 09:06 AM..

03-30-2009, 09:53 PM	#45
yokotavia Zilvia Addict Join Date: Dec 2007 Location: The land of bosos and schoolgirls Posts: 679 Trader Rating: (16) Feedback Score: 16 reviews	replace your coil pack harness and maybe your coil packs. your not getting spark. your not getting spark. your not getting spark. well at least the right amount of spark.. your saying its not starting and your plugs are soaked with unburnt fuel. thats a coilpack/spark issue borrow those from a friend and test it. its not compression. its not the ecu its not timing if your as right as you think check out the sparkplug/ignitor/coilpack/coilpack harness/coilpack ground __________________ Banana boat chronicles

03-31-2009, 06:35 AM	#46
fliprayzin240sx Man w/ CTSV & a Car Seat Join Date: Aug 2002 Location: Tampa Posts: 17,998 Trader Rating: (19) Rides Gallery: fliprayzin240sx Feedback Score: 19 reviews	Stab in the dark...but is your fuel line in properly? As in you didnt crossed them? Check that (best way to remember it, line from the fuel filter NOT to the regular), then id say check the compression to make sure it wasnt the rebuild. __________________ If you think Zilvia has too many assholes... CLICK HERE!!!

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03-30-2009, 06:54 AM	#31
aNskY Nissanaholic! Join Date: Apr 2005 Location: NY Age: 37 Posts: 1,604 Trader Rating: (10) Feedback Score: 10 reviews	is your coilpack harness grounded to the back of the head?

03-30-2009, 09:39 AM	#34
whitesileighty Join Date: Mar 2005 Location: Denver Age: 39 Posts: 27 Trader Rating: (0) Feedback Score: 0 reviews	I haven't checked compression yet, but with the BC springs on the valves it's a real bitch to turn over with a wrench without removing the spark plugs, so I know it's got compression. I'll run the test on it tonight, I've got no doubt that it's got compression though, and plenty of it. I tried opening the throttle a little bit while starting it and it didn't start, so I guess that rules out the IACV. And when I tested the ignitor from a friend I also borrowed his coilpack harness, so both of those have been ruled out. I'll post compression after I test tonight.

03-30-2009, 09:47 AM	#35
godsmack Zilvia Addict Join Date: Feb 2009 Location: Allentown, PA Age: 36 Posts: 652 Trader Rating: (0) Feedback Score: 0 reviews	Besides for the obvious did you happen to clean you're plugs after the first initial start up? When i swapped my motor out i had the same problem happen to me and i cleaned my plugs and it fired right up. Might not be ur problem but just something to shoot for if you haven't already tried it.

03-30-2009, 10:03 AM	#36
whitesileighty Join Date: Mar 2005 Location: Denver Age: 39 Posts: 27 Trader Rating: (0) Feedback Score: 0 reviews	They were brand new plugs originally, and I keep cleaning them every time I pull them out. They're covered in blackened fuel when I pull them out.

03-30-2009, 10:20 AM	#37
godsmack Zilvia Addict Join Date: Feb 2009 Location: Allentown, PA Age: 36 Posts: 652 Trader Rating: (0) Feedback Score: 0 reviews	When you swapped out the ignitor and harness did you check to see if you had the same firing symptoms? You're spark isn't keeping up with the fuel. swap in stock injectors see if it will fire with less fuel.

03-30-2009, 11:09 AM	#38
whitesileighty Join Date: Mar 2005 Location: Denver Age: 39 Posts: 27 Trader Rating: (0) Feedback Score: 0 reviews	Tried that too. No go. I swapped the battery and am now getting constant spark when I test, so it's just problem after problem. Currently constant spark plenty of fuel, doesn't come any closer to starting when the stock 370cc injectors are in that when the 740cc injectors are in.

03-30-2009, 12:11 PM	#39
whitesileighty Join Date: Mar 2005 Location: Denver Age: 39 Posts: 27 Trader Rating: (0) Feedback Score: 0 reviews	Oh and yes, the coilpack harness is ground to the back side of the head. It was a pain in the arse to remove the ground to test the second coilpack harness because of the bolt location. I not only tested the coilpack harness by installing it and testing, I also used a multimeter and figured out there were no issues with it.

03-30-2009, 02:05 PM	#40
whitesileighty Join Date: Mar 2005 Location: Denver Age: 39 Posts: 27 Trader Rating: (0) Feedback Score: 0 reviews	Let me phrase another way to see if I can get some more ideas. Assuming a car is running name the sensors that would prevent it from starting again once you shut it off. TPS, MAFS, IACV (if it completely died), CAS? Any others? Cause I'm thinking coolant sensor, oil pressure, O2, knock, and any others shouldn't keep it from starting, maybe from running well, but it should still start. I haven't looked at the TPS so maybe I'll see if I can figure out how to test it to be able to see if that's causing the issue since I've ruled out the other 3.

03-30-2009, 03:54 PM	#41
godsmack Zilvia Addict Join Date: Feb 2009 Location: Allentown, PA Age: 36 Posts: 652 Trader Rating: (0) Feedback Score: 0 reviews	well tps could be it since you're getting fuel and spark. so now it has to be an air problem. so i guess take off the intake mani and tb clean everything up just take off upper mani though. and also clean the iacv up real good.

03-30-2009, 03:55 PM	#42
godsmack Zilvia Addict Join Date: Feb 2009 Location: Allentown, PA Age: 36 Posts: 652 Trader Rating: (0) Feedback Score: 0 reviews	and cas would also not let it start but usually that deals with the spark side i'm pretty sure.

03-31-2009, 06:54 PM	#48
greenman100 Zilvia Addict Join Date: Aug 2008 Location: Florida Posts: 694 Trader Rating: (18) Feedback Score: 18 reviews	basically all that's left is the ECU, CAS, and wiring in between.

04-26-2009, 11:32 PM	#49
slamed_s13 Leaky Injector Join Date: Oct 2008 Location: San Antonio TX Age: 32 Posts: 140 Trader Rating: (4) Feedback Score: 4 reviews	Any progress? Did you ever figure out the problem whitesileighty?

11-10-2010, 11:06 PM	#50
whitesileighty Join Date: Mar 2005 Location: Denver Age: 39 Posts: 27 Trader Rating: (0) Feedback Score: 0 reviews	I had to look up this post because a friend wanted to know my pre-starting compression numbers for troubleshooting his car. Just to update the problem was that the exhaust cam snapped in 3 pieces before it ever started. Apparently it was damaged in shipping or something. When I installed I was staring at the shop manual torquing everything to spec in order so I know I didn't screw it up. Once I threw stock cams in it started right up.