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Spark timing.


gvr4ever
Forever Member
347/1000


Galant VR-4 org Post #: 1212578 posted 07/17/15 06:28 AM     Remind Me!  Send Private Message   Edit Post      
347/1000 is still ill. It is at a shop right now. So far the diagnosis is, compression is good, leak down test is good, everything is timed right. CYL 1 is not contributing. The mechanic says spark sounds different on CYL 1. Car has all new plugs, wires, coil pack, resistor pack.

I had the ECU tested and it received a pass, but could anything ECU related cause a bad spark timing, weak spark? I think he is going to try putting my original CAS back on, but I had a newer looking one that Iceman gave me. I don't think that is it, but so far, the solution hasn't been found.

Extra info. The car is a California car. It has a Keydiver chip that bypasses any original differences, but does anything remain under the hood that could fail and cause problems?

Any ideals?



1992 Nile black w/sunroof
15xK miles. 2nd owner since 1998


Edited by gvr4ever (07/17/15 07:49 AM)

Posts: 6007 | From: central Indiana | Member Since: 08/06/02 | IP: (128.210.219.125) | Report this post to a Moderator

prove_it
my racist jokes aren't actually funny
715/1000
1284/2000


Galant VR-4 org Post #: 1212583 posted 07/17/15 08:17 AM     Remind Me!  Send Private Message   Edit Post      
Swap #1 and #4 injector and see if the dead cylinder moves to #4. If all the ignition is in order, then I suspect a bad injector/not firing.



#1284/2K NB, Totaled
#715/1K KG, Rebuilding
02 Acura TL daily duty unit

12yr+ Vr4 owner.
Honda/Acura master tech.
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gvr4ever
Forever Member
347/1000


Galant VR-4 org Post #: 1212589 posted 07/17/15 09:01 AM     Remind Me!  Send Private Message   Edit Post      
I've tried changing injectors. All 4 have been cleaned and matched pretty well anyway. Fuel is on the spark plug. Power to all the injectors were tested with a noid light. Mechanic confirmed that cyl 1 is getting fuel. Last I heard, he thought it might be a spark timing issue.



1992 Nile black w/sunroof
15xK miles. 2nd owner since 1998

Posts: 6007 | From: central Indiana | Member Since: 08/06/02 | IP: (128.210.219.125) | Report this post to a Moderator

thomcasey
I ain't no puny human
866/1000


Galant VR-4 org Post #: 1212590 posted 07/17/15 09:06 AM     Remind Me!  Send Private Message   Edit Post      
Try swapping the spark plug wires on the coil for 1 and 4 to see if the issue moves. Since it is a waste-spark system, it would still run if they were swapped.



Thom
866/1000 (PTE 1200's, billet 20g+, DSMLink v3, eagle/ross, .020 over, 272's, GC/AGX Coilovers)


Edited by thomcasey (07/17/15 09:28 AM)

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transparentdsm
I have to say something dumb Member
138/2000


152/1000


Galant VR-4 org Post #: 1212591 posted 07/17/15 09:08 AM     Remind Me!  Send Private Message   Edit Post      
just because its a new coil pack don't mean its good, i get brand new electric parts that are bad from time to time. have you verified that there is spark going through the #1 wire? also there is a power transistor what can short out, i had the clip break that holds the harness to it once and the car did some crazy things.



138/2000
152/1000

Posts: 3675 | From: Klamath Falls, Or | Member Since: 07/27/11 | IP: (50.37.26.248) | Report this post to a Moderator

gvr4ever
Forever Member
347/1000


Galant VR-4 org Post #: 1212610 posted 07/17/15 12:25 PM     Remind Me!  Send Private Message   Edit Post      
What power transistor?



1992 Nile black w/sunroof
15xK miles. 2nd owner since 1998

Posts: 6007 | From: central Indiana | Member Since: 08/06/02 | IP: (128.210.219.125) | Report this post to a Moderator

prove_it
my racist jokes aren't actually funny
715/1000
1284/2000


Galant VR-4 org Post #: 1212611 posted 07/17/15 12:26 PM     Remind Me!  Send Private Message   Edit Post      
Seriously? It's the long flat connector connected to a squarish black thin box attached to a piece of metal.



#1284/2K NB, Totaled
#715/1K KG, Rebuilding
02 Acura TL daily duty unit

12yr+ Vr4 owner.
Honda/Acura master tech.
Family Guy

Posts: 4201 | From: Sioux Falls, SD | Member Since: 07/04/08 | IP: (24.230.93.110) | Report this post to a Moderator

transparentdsm
I have to say something dumb Member
138/2000


152/1000


Galant VR-4 org Post #: 1212617 posted 07/17/15 12:46 PM     Remind Me!  Send Private Message   Edit Post      
attached to the intake manifold by the coil pack. it actually has power transistor stamped on the front of it.



138/2000
152/1000

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4g63mightymax
Member


Galant VR-4 org Post #: 1212624 posted 07/17/15 01:32 PM     Remind Me!  Send Private Message   Edit Post      
4G63 runs crappy - This is what I would do:

1)With the engine running, unplug each injector connector and plug it back in again. If the engine slows down and runs crappier with the injector unplugged, then that cylinder overall is doing its job. Test each cylinder one at a time and make sure that it isn't more than one cylinder failing at life. Let's assume you did this and found that it really is #1 cylinder misfiring.

2)Do a compression test. It should be like 150-155psi-ish in each cylinder, give or take 10%-ish. If compression is bad (like ~120psi or below), do a cylinder leakage test. If compression is good, go to step 3.

3)Swap spark plugs from #1 to #whateverworkingcylinderyouwanttostealasparkplugfrom. Now re-do Step #1. If the misfire stays at #1, go to step 4. If not, replace your bad spark plug and love life.

4) Pull your fuel rail off and swap your injectors from #1 to #whateverworkingcylinderyouwanttostealaninjectorfrom. Be sure not to destroy your injector seals. If you destroy them, they will leak, and burn your everything to the ground. It may be smart to get the $14 4G63 injector seal kit from eBay before you do this step. Once the injectors are reinstalled, re-do Step #1 again. If the dead cylinder moves, replace your crappy injector. If the misfire is still #1, go to step 5.

5) Go buy, borrow, steal injector noid light. Most people don't have these which is why I made this step #5 instead of step #1. If you are going to be a car-guy/gal, you may want to get a set of them because they are fun, and you can test injector circuits like a boss. So - plug in your noid light and make sure that your ECU is pulsing your injectors. If it is pulsing normally compared to the others - you are imagining things and don't have a car at all. You are just having a nightmare about a car you once owned when you were in high school. If the noid light is not pulsing, go to step 6.

6) With the ignition on, both wires at the injector clip should have power. Make sure that they do. If not, your ECU is wonky. If they do, and your injector is not pulsing, then the ECU is not telling that injector to pulse. This would be odd because this problem never happens. Go on to step 7.

7) From my experience, either your ECU, or CAS will be the problem. I have never seen a power transistor go bad internally, and I've screwed around with a lot of 4G63's for a long time. CAS's and ECU do get weird though. Swap out each of these with other units and see if that fixes the problem. Borrow them from friends so it won't cost you anything. If neither of those fix your problem, go to step 8.

8) There is no step 8. If you have made it this far, you must have messed up the diagnosis. Please start over at step 1.

Hope that helps.
-Jeremy



Jeremy N.
GVR4 #1803/2000
Engine Noise Podcast


Edited by 4g63mightymax (07/17/15 01:35 PM)

Posts: 195 | From: MA | Member Since: 04/06/13 | IP: (63.138.170.139) | Report this post to a Moderator

prove_it
my racist jokes aren't actually funny
715/1000
1284/2000


Galant VR-4 org Post #: 1212625 posted 07/17/15 01:38 PM     Remind Me!  Send Private Message   Edit Post   
Quoting gvr4ever:

Car has all new plugs, wires, coil pack, resistor pack.






He did all that. Except the power transistor. (magic box hanging on manifold)



#1284/2K NB, Totaled
#715/1K KG, Rebuilding
02 Acura TL daily duty unit

12yr+ Vr4 owner.
Honda/Acura master tech.
Family Guy


Edited by prove_it (07/17/15 01:38 PM)

Posts: 4201 | From: Sioux Falls, SD | Member Since: 07/04/08 | IP: (24.230.93.110) | Report this post to a Moderator


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