ECU/SPARK issue

Post by **Florida240sx** » Thu Nov 09, 2006 3:57 pm

I posted this in tech and got ignored So need yalls knowledge(which is better anyways)Did a sohc to dohc swap...Tried to start the car and nothing. Fuel pump was bad....Swapped with working one and it didn't turn on... So I ran a direct ground and positive to the battery with a toggle switch....Car started up and ran for about 5 seconds then died...Tried to start again and lost all power(DEAD BATTERY)Got a brand new battery and my friend was installign it while I was wrapping tape around the fuel pump wires...a wrench was dropped and the positive grounded and sparks flew....Didn't find any fuses blown but replaced with ones out of my car nonetheless. Car has no spark.... Replaced with coil and ignitor from my car...nothing...Put my ecu in and still nothing......Any ideas???

Post by **S0lid_Snake** » Thu Nov 09, 2006 4:06 pm

how is all the wiring in your car? is there a loose/bare one that is touching metal and frying your electronics? sorry man, just trying to give you some ideas

Post by **Florida240sx** » Thu Nov 09, 2006 6:42 pm

There was some other issues....but I fixed what I could see (2wires) and the car was running... then the battery sparked due to a wrench in between the post....ECU led does not light up....What power/ground go to the ecu???The relay box by the battery all checked out fine...anywhere else to check or do I have a melted wire somewhere?? I'm about ready to rewire the whole car...because nothing works like factory....

Post by **Florida240sx** » Fri Nov 10, 2006 1:33 pm

ECU power comes from......Need th epinotu of the ecu if anyoen has one handy.. The one in the sticky is a red X now

Post by **RPS13.5** » Tue Jan 23, 2007 10:26 am

try this linkhttp://forums.nicoclub.com/zerothread?id=221165

Post by **PapaSmurf2k3** » Tue Jan 23, 2007 12:31 pm

To tell you the truth, dropping a wrench in between the posts shouldn't damage the car too much, at least I don't think it should. I would think none of the wiring would be damaged, now if you dropped it between a positive wire and a ground, making a short, then I would be worried. Is the battery OK after that? Check all your power wires with a multi-meter and known good ground, then compare against their supposod ground. I hate electrical problems, sorry man, I feel your pain.

Post by **Edub1** » Tue Jan 23, 2007 2:23 pm

My understanding of electicity is that it will take the path of least resistance. I fail to see how shorting + post to ground would send current anywhere but through the wrench. Especially given that no other circuits were completed by what you did.

What is the car doing? Is it cranking or just no spark? Can you be more specific?

Post by **Florida240sx** » Tue Jan 23, 2007 7:23 pm

Car has no spark ecu has no power, key was turned in on position when this happened. He said he was done and I was checking something and next thing I knew saw the wrench and sparks.. I beleive the one wrench was touching the chassis and the negative terminal

Post by **WDRacing** » Tue Jan 23, 2007 8:42 pm

HAHAHAHA...dude, what are you thinking having the battery hooked up when you're doing a job like this? The battery always gets disconnected first and reconnected last. No exception ever...

Is the ecu getting power to it? If it is and you get nothing, try swapping in a ecu. Make SURE you don't have any ghetto rigging arcing or grounded out.

WD

Post by **Edub1** » Wed Jan 24, 2007 6:11 am

Run a wire from the ECU - to the chassis and run a wire from battery + to the proper ECU pin.

Does the car crank? You could have shorted the battery.

Post by **240esseckz** » Wed Apr 25, 2007 9:07 pm

man...im in the exact same shoes...sohc to dohc...and no ecu, no spark, and no fuel pump power...i didnt drop a wrench or nothin tho...

Post by **S13FX** » Thu Apr 26, 2007 4:46 am

Florida240sx wrote:So I ran a direct ground and positive to the battery with a toggle switch....Car started up and ran for about 5 seconds then died...Tried to start again and lost all power(DEAD BATTERY)Got a brand new battery and my friend was installign it while I was wrapping tape around the fuel pump wires...a wrench was dropped and the positive grounded and sparks flew....Didn't find any fuses blown but replaced with ones out of my car nonetheless. Car has no spark.... Replaced with coil and ignitor from my car...nothing...Put my ecu in and still nothing......Any ideas???

Ok Has any one caught the fact the the car started and ran for a few when he directly wired in the battery and then battery completely died. To me from past experience, and actually recently too, it was on a friends civic, It sounds like the wiring from the alternator to battery to starter is messed up.

Unless you are still running direct connection with the battery, all three of those things are wired in together and if something is wrong with a ground or anything of that sort between the three, nothing will work.

Post by **Florida240sx** » Thu Apr 26, 2007 5:34 am

Everything was working. Not there is just no power to the ecu. Yes it has been swapped. Fuses have been checked. Ecu that was in the car has been put in another car and works fine. Was guessing that the wire harness melted.......All lights and turn signals etc work.

Post by **Edub1** » Thu Apr 26, 2007 1:10 pm

Forget the little wrench misshap - all it did was blew a pit in the wrench.

I would get the wiring schematics for both cars and compare. I'm fairly sure there are some differences. I know MAF swaps and such have different wiring proceedure for E and DE motors. I'd look at that before looking for a problem. What is the most likely when you swapped an ECU from one motor to a different motor, compatability or a malfunction? I'd check comapatability first.

Post by **gaehrings13** » Thu Apr 26, 2007 4:59 pm

Is the engine not turning over at all or is it turning over and not starting. Sorry but im confused. Just want to make sure if atleast the starter is working.

Post by **Florida240sx** » Fri Apr 27, 2007 6:33 am

Edub1 wrote:Forget the little wrench misshap - all it did was blew a pit in the wrench.

Then why did I have no problems prior to it. Car started on the first turn of the key.... then after the wrench no power to the ecu. All dash controls work, lights work, just no power to ecu so no spark or anything... Engine would still turn over.....

Post by **nissanfanatic** » Fri Apr 27, 2007 9:38 am

Check the alternator fuse.. I had that one pop when I shorted..

Post by **Chezedik** » Fri Apr 27, 2007 11:31 am

Check your grounds at the firewall to the engine. One of them runs straight to the ECU on the DOHC.

Post by **Florida240sx** » Sat Apr 28, 2007 8:02 am

Replaced all the fuses, and checked all the grounds.... Car is just a chassis now, my friend spun a rod bearing so I gave him the engine. Couldn't track down another wiring harness.... Going to become an rb25 now... or vh45de

Post by **Chezedik** » Sat Apr 28, 2007 4:54 pm

VK56DE? Or Bored/stroked, VK60DETT!

Post by **Florida240sx** » Sun Apr 29, 2007 3:39 pm

vh45de with upgraded springs "300zx" and going to add some boost to it... keeping it auto

Post by **Chezedik** » Mon Apr 30, 2007 3:41 am

You had me until that last part.

Post by **WDRacing** » Mon Apr 30, 2007 6:10 am

Keeping it auto isn't a bad thing, especially if you don't want to buy a transmission adapter...

Post by **Chezedik** » Mon Apr 30, 2007 8:29 am

Wow, so now we have a pair of queers... J/K.

Post by **Florida240sx** » Tue May 01, 2007 6:14 am

nissan v8 and boost???? make my ka-t look queer on the street.... about as bad as my 240 makes the hondas look

Post by **Chezedik** » Tue May 01, 2007 7:32 am

Yeah, but what are you gonna do with your right hand if you get an auto?

ECU/SPARK issue

ECU/SPARK issue

Re: ECU/SPARK issue (Florida240sx)

Re: (Florida240sx)

Re: (Florida240sx)

Re: (PapaSmurf2k3)

Re: (Florida240sx)

Re: (Florida240sx)

Re: (Edub1)

Re: ECU/SPARK issue (Florida240sx)

Re: (Florida240sx)

Re: (Edub1)

Nissan Forums

Infiniti Forums

Datsun Forums

Technical Forums

Classifieds / Marketplace

Nissan Motorsports

General Forums