Started with coils blowing/misfire - now electrical issue - cause unknown. HELP!
03-04-2014, 01:26 AM
#1
Registered User
Thread Starter
Join Date: Nov 2012
Location: Australia
Posts: 10
Likes: 0
Received 0 Likes
on
0 Posts
Started with coils blowing/misfire - now electrical issue - cause unknown. HELP!
Hi all,
2003 Manual 350z Roadster - from Australia.
Here's the rundown.
Initial Symptoms
Coil Pack died. Misfire begun. I did some quick investigation and found that one of my coil packs were blown - I knew this by disconnected packs until i found the one that made no difference to the misfire, then swapped it with another pack and found the problem moved with the pack.
I had to drive about 30km's, 10k'ms left to destination and my misfire problem got worse. I assume another coilpack died.
I went to the wreckers, bought a set of 6 coil packs, changed the one I knew was dead the next morning - Car would not crank. Changed another, same issue.
What I tried at this point
1. Checked all known ground connections in engine bay
2. Jumped the battery
None of the above helped. So:
3. I connected jumper cables from from the Motor to the Chassis - I now can CRANK, but not ignite - At this point, my number 3 coilpack (drivers side started to smoke up after a few cranks, was getting HOT).
I called my mechanic who then did the following:
4. Removed whole wiring loom and checked wire for wire - everything is fine, no obvious shorts.
5. Replaced Ignition Condenser plug, which appeared dead. Didn't help.
6. Made some better ground wiring to allow crank - this also appeared to have stopped the Coil Packs from getting hot and blistering/smoking.
7. Replaced spark plugs with new ones - one of them WAS fouled, suggesting injection pulse?
8. I have my ECU flashed with Uprev, so I disabled NATS - didn't help.
9. I reverted the MAP back to stock - didn't help.
We have no idea what's going on.
I got another ECU, but I have to wait before I can disable NATS until Uprev process the Dump of the ECU, so I can't test that without nissan performing a reprogram - getting a quote for this tomorrow so I know whether it's worth it.
Just an additional symptom - I never got a misfire code which I checked for. I wasn't getting any codes from my ECU that I probably should have got, was always P0000. Now, with the new ECU, I've got the code for NATS, as well as a U1000 and U1001 - which I know means bad ground wiring.
I am suspecting the issue is either of the following:
1. A bad ground somewhere else besides in the engine bay (we've checked steering column too under dash).
2. ECU fried.
I just want to know if anyone has any other ideas/suggestions for me to check. This is becoming unnecessarily expensive and doing my head in! I've done so much work to figure it out and am getting nowhere. It's quite possible driving that little bit with the misfire made issues much worse, but I don't know at this point honestly.
Any help is greatly appreciated!
2003 Manual 350z Roadster - from Australia.
Here's the rundown.
Initial Symptoms
Coil Pack died. Misfire begun. I did some quick investigation and found that one of my coil packs were blown - I knew this by disconnected packs until i found the one that made no difference to the misfire, then swapped it with another pack and found the problem moved with the pack.
I had to drive about 30km's, 10k'ms left to destination and my misfire problem got worse. I assume another coilpack died.
I went to the wreckers, bought a set of 6 coil packs, changed the one I knew was dead the next morning - Car would not crank. Changed another, same issue.
What I tried at this point
1. Checked all known ground connections in engine bay
2. Jumped the battery
None of the above helped. So:
3. I connected jumper cables from from the Motor to the Chassis - I now can CRANK, but not ignite - At this point, my number 3 coilpack (drivers side started to smoke up after a few cranks, was getting HOT).
I called my mechanic who then did the following:
4. Removed whole wiring loom and checked wire for wire - everything is fine, no obvious shorts.
5. Replaced Ignition Condenser plug, which appeared dead. Didn't help.
6. Made some better ground wiring to allow crank - this also appeared to have stopped the Coil Packs from getting hot and blistering/smoking.
7. Replaced spark plugs with new ones - one of them WAS fouled, suggesting injection pulse?
8. I have my ECU flashed with Uprev, so I disabled NATS - didn't help.
9. I reverted the MAP back to stock - didn't help.
We have no idea what's going on.
I got another ECU, but I have to wait before I can disable NATS until Uprev process the Dump of the ECU, so I can't test that without nissan performing a reprogram - getting a quote for this tomorrow so I know whether it's worth it.
Just an additional symptom - I never got a misfire code which I checked for. I wasn't getting any codes from my ECU that I probably should have got, was always P0000. Now, with the new ECU, I've got the code for NATS, as well as a U1000 and U1001 - which I know means bad ground wiring.
I am suspecting the issue is either of the following:
1. A bad ground somewhere else besides in the engine bay (we've checked steering column too under dash).
2. ECU fried.
I just want to know if anyone has any other ideas/suggestions for me to check. This is becoming unnecessarily expensive and doing my head in! I've done so much work to figure it out and am getting nowhere. It's quite possible driving that little bit with the misfire made issues much worse, but I don't know at this point honestly.
Any help is greatly appreciated!
Last edited by jowjeh; 03-04-2014 at 02:03 AM.
Thread
Thread Starter
Forum
Replies
Last Post
Colombo
Forced Induction
35
11-09-2020 10:27 AM
