#5 won't fire! - Aussie V8 | Holden - Ford

RedHotMike · 07-09-2008, 07:59 PM

Hi all,

Long time lurker, first time poster so please be kind!

I have a VP Clubby 5000i motor (4 bolt mains, D port heads etc) that refuses to fire on #5. 99.9% sure it's electrical as when I plugged the timing light in it only flashed occasionally where all the other leads were flashing as I would expect. Pulled the plug and it was black and wet with fuel. All the other plugs were a light gray color and looked fine.

So far I have changed:
Plug, lead (tested fine but I tried a different one any way), Dizzy cap and rotor button.

Starting to run out of ideas

Compression is about the same as others and it isn't blowing smoke, nor is it difficult to start (fires first time every time). Any help appreciated.

Cheers,
Red Hot Mike

allports · 07-09-2008, 08:45 PM

If you've changed the plug, leads rotor and cap and nothing changed I would say that you must look deeper in the engine. Either that or the injector isnt working....but although you've done a comp test I would still think you need to look at cam lobe or a bent push rod, something on those lines.

RedHotMike · 07-09-2008, 08:51 PM

Quote:

Originally Posted by allports

If you've changed the plug, leads rotor and cap and nothing changed I would say that you must look deeper in the engine. Either that or the injector isnt working....but although you've done a comp test I would still think you need to look at cam lobe or a bent push rod, something on those lines.

Injectors and fuel system is fine. I was having other issues but they are resolved now. The regulator isn't brilliant but holds pressure ok. Pump is right in the middle of spec.

Thanks for the suggestion - I'll whip off the rocker cover and check that all is rocking and rolling there when I get home tomorrow. Don't understand how that would explain the lack of pulse from the lead though.

Cheers,
Red Hot Mike

400HPONLPG · 07-09-2008, 09:31 PM

Bet he has got a bad case of "CamusLobus Dissapearus"

PVE · 07-09-2008, 09:38 PM

Or
Check for EMI interference. A missing condition can be caused by Electromagnetic Interference (EMI) on the reference circuit. An EMI problem can usually be detected by monitoring the engine RPM with a Tech 2 scan tool. A sudden increase in RPM with little change in the actual engine RPM change, indicates that EMI is present. If the
problem exists, check the routing of the secondary wires, also, check the earth circuit.

RedHotMike · 07-09-2008, 09:40 PM

Quote:

Originally Posted by PVE

Or
Check for EMI interference. A missing condition can be caused by Electromagnetic Interference (EMI) on the reference circuit. An EMI problem can usually be detected by monitoring the engine RPM with a Tech 2 scan tool. A sudden increase in RPM with little change in the actual engine RPM change, indicates that EMI is present. If the
problem exists, check the routing of the secondary wires, also, check the earth circuit.

Is there a procedure to detect this without a tech2? The tacho looks normal and doesn't jump about.

Cheers,
Red Hot Mike

PVE · 07-09-2008, 10:20 PM

Don't think there is.... If you had realtime Kalmaker you see the tacho output from the ECM.

One thing that can induce EMI is wires that run side by side in a loom without the loom having a twist.......... hope that describes it.

allports · 08-09-2008, 05:57 PM

Quote:

Originally Posted by 400HPONLPG

Bet he has got a bad case of "CamusLobus Dissapearus"

Me thinkus the sameus

RedHotMike · 09-09-2008, 04:52 PM

Thanks for all the suggestions. Fixed it this arvo - It appears the lead was earthing out and short circuiting. Wouldn't have thought a new lead would do that??? Anyhow it's fixed now.

Cheers,
Red Hot Mike

allports · 09-09-2008, 07:13 PM

Quote:

Originally Posted by RedHotMike

Thanks for all the suggestions. Fixed it this arvo - It appears the lead was earthing out and short circuiting. Wouldn't have thought a new lead would do that??? Anyhow it's fixed now.

Cheers,
Red Hot Mike

Good you found it awesome. What Brand Top Gun?

PVE · 09-09-2008, 08:56 PM

Allports,
Which leads have you found better than Top Gun?
Where would you rate Top Gun in comparison to other leads.
Cheers

allports · 09-09-2008, 09:01 PM

Eagle or Magnacore TG seem to die off real quick with a bit of heat and a good ign syst'

RedHotMike · 09-09-2008, 09:52 PM

Quote:

Originally Posted by allports

Good you found it awesome. What Brand Top Gun?

Eagle..... Was brand new! I'll take it back tomorrow. What leads do you recommend for a mild mill. 276 cam, 9.5:1, stock "D" port heads etc etc.

Cheers,
Red Hot Mike

allports · 09-09-2008, 09:59 PM

anything that wont bleed

wabbit · 09-09-2008, 10:15 PM

you don't say what ignition system you have, so I'd assume it's stock.

I think you need to look at where you are routing the leads, or the same problem could happen again

07-09-2008, 07:59 PM	#1 (permalink)
RedHotMike Newbie Trade Rating: (0) Join Date: Jul 2007 Location: Melbourne, Australia Ride: VE SS-V Posts: 12	#5 won't fire! Hi all, Long time lurker, first time poster so please be kind! I have a VP Clubby 5000i motor (4 bolt mains, D port heads etc) that refuses to fire on #5. 99.9% sure it's electrical as when I plugged the timing light in it only flashed occasionally where all the other leads were flashing as I would expect. Pulled the plug and it was black and wet with fuel. All the other plugs were a light gray color and looked fine. So far I have changed: Plug, lead (tested fine but I tried a different one any way), Dizzy cap and rotor button. Starting to run out of ideas Compression is about the same as others and it isn't blowing smoke, nor is it difficult to start (fires first time every time). Any help appreciated. Cheers, Red Hot Mike Last edited by RedHotMike; 07-09-2008 at 08:08 PM.

07-09-2008, 08:45 PM	#2 (permalink)
allports Engine scientist Trade Rating: (1) Join Date: Jun 2007 Location: Sydney Ride: Dragster Posts: 3,196	If you've changed the plug, leads rotor and cap and nothing changed I would say that you must look deeper in the engine. Either that or the injector isnt working....but although you've done a comp test I would still think you need to look at cam lobe or a bent push rod, something on those lines. __________________ If you plant a cucumber, you get a cucumber! Two things are infinate,the universe & human stupidity, and Im not sure about the universe. Albert Einstein Without deviation from the norm, progress is not possible. Frank Zappa

09-09-2008, 09:01 PM	#12 (permalink)
allports Engine scientist Trade Rating: (1) Join Date: Jun 2007 Location: Sydney Ride: Dragster Posts: 3,196	Eagle or Magnacore TG seem to die off real quick with a bit of heat and a good ign syst' __________________ If you plant a cucumber, you get a cucumber! Two things are infinate,the universe & human stupidity, and Im not sure about the universe. Albert Einstein Without deviation from the norm, progress is not possible. Frank Zappa

09-09-2008, 09:59 PM	#14 (permalink)
allports Engine scientist Trade Rating: (1) Join Date: Jun 2007 Location: Sydney Ride: Dragster Posts: 3,196	anything that wont bleed __________________ If you plant a cucumber, you get a cucumber! Two things are infinate,the universe & human stupidity, and Im not sure about the universe. Albert Einstein Without deviation from the norm, progress is not possible. Frank Zappa

09-09-2008, 10:15 PM	#15 (permalink)
wabbit smell something burning? Trade Rating: (0) Join Date: Oct 2004 Location: Rockhampton Ride: VK Commy slugmobile, Kia Rio, LH Torry Posts: 6,091	you don't say what ignition system you have, so I'd assume it's stock. I think you need to look at where you are routing the leads, or the same problem could happen again __________________ Nothing to see, here Move along, please .

07-09-2008, 09:31 PM	#4 (permalink)
400HPONLPG Do you ever leave? Trade Rating: (0) Join Date: Nov 2005 Location: Perth Ride: HZ one tonner Gas only, WB Stato Gas only ,XR650R Posts: 2,253	Bet he has got a bad case of "CamusLobus Dissapearus"

07-09-2008, 09:38 PM	#5 (permalink)
PVE casual poster Trade Rating: (0) Join Date: May 2008 Location: Perth Ride: Holden Posts: 305	Or Check for EMI interference. A missing condition can be caused by Electromagnetic Interference (EMI) on the reference circuit. An EMI problem can usually be detected by monitoring the engine RPM with a Tech 2 scan tool. A sudden increase in RPM with little change in the actual engine RPM change, indicates that EMI is present. If the problem exists, check the routing of the secondary wires, also, check the earth circuit.

07-09-2008, 10:20 PM	#7 (permalink)
PVE casual poster Trade Rating: (0) Join Date: May 2008 Location: Perth Ride: Holden Posts: 305	Don't think there is.... If you had realtime Kalmaker you see the tacho output from the ECM. One thing that can induce EMI is wires that run side by side in a loom without the loom having a twist.......... hope that describes it.

09-09-2008, 04:52 PM	#9 (permalink)
RedHotMike Newbie Trade Rating: (0) Join Date: Jul 2007 Location: Melbourne, Australia Ride: VE SS-V Posts: 12	Thanks for all the suggestions. Fixed it this arvo - It appears the lead was earthing out and short circuiting. Wouldn't have thought a new lead would do that??? Anyhow it's fixed now. Cheers, Red Hot Mike

09-09-2008, 08:56 PM	#11 (permalink)
PVE casual poster Trade Rating: (0) Join Date: May 2008 Location: Perth Ride: Holden Posts: 305	Allports, Which leads have you found better than Top Gun? Where would you rate Top Gun in comparison to other leads. Cheers

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