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The mkiv Supra Owners Club

Starting problem


AMG

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Hi all, been a while since I have posted on here but here goes.

 

Went to start the supra after about a month of standing and it won't fire. It turns over and sometimes gives an initial impression it is going to fire but then just keeps turning.

 

I have not messed with anything lately so I am presuming something has persisted.

 

After a bit of reading and messing about today still nothing.

 

Changed old copper plugs for brand new iridium's.

Fault codes 25 and 78 stored.

12v fuel pump check via dia port. Pump fine and can smell fuel in bay.

All fuses appear fine.

Coil packs swapped round and 'look' fine.

Battery good and on optimate 24/7.

 

 

Not had chance to check the spark yet, really should of done this when changing plugs but never thought at the time.

 

Any ideas as to what could be wrong would be appreciated. It's not helping my argument to keep the supra with a house move and a baby on the horizon :(

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Are igniters and plugs in the habit of failing simply from being unused for a month? Seems a bit unlikely.

 

Maybe the battery has lost it's peak amps from being on charge constantly? I'd try another one.

 

Be careful jumping it unless the existing battery is very low, as I was told that it can fry the igniter and ECU if amps are too high.

 

Only what I was told by a garage owner who had a GZ I was interested in with the same stuttering problem. His mechanic said it was the igniter not firing all cylinders because it had stood until flat so they jumped it.

 

I've had no such problem from jumping but the fitted battery is always dead when I do. It's only a slim one and doesn't last long without use.

 

I'd blame the damp weather causing a short or poor connection somewhere.

 

You'll need to reset and then check the fault codes after a fresh starting attempt, as the existing codes could be from a resolved issue.

 

Someone will know what they mean, if not, I'll look them up.

 

Jesus, ermmmm, good luck!

 

http://www.mkivsupra.net/vbb/showthread.php?35920-How-To-Check-the-diagnostics-codes&highlight=Fault+code

Edited by Morpheus
Added link to FAQ (see edit history)
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mine has been in the garage all winter,

 

havent tried starting mine yet, hope all goes well.

 

 

as above cant see the ignitor just failing for non use.

 

 

and i have read on here that the ignitor gets damaged only if jump started incorreclty. if done normal its fine. (jump started mine about 10 times last year)

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Right then. Not much progress due to work but I have reset the codes. Attempted to start it again but no luck. It tried for about one second then just kept turning over. Checked the codes again but there were none stored.

 

Does this rule anything out or does it just tell me nothing :rolleyes:

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Right then. Not much progress due to work but I have reset the codes. Attempted to start it again but no luck. It tried for about one second then just kept turning over. Checked the codes again but there were none stored.

 

Does this rule anything out or does it just tell me nothing :rolleyes:

 

How much fuel is in it and how old is it? Might be running on fumes. Has to be something very basic, I reckon.

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That's what I am hoping mate.

The tank is about half full and it is only about a month old. :shrug:

 

All I can suggest is to pull off the HT leads at the other end and and re-connect them one by one, as well as any others that might possibly be an issue because of dampness or corrosion. :)

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Oh right.

 

The battery is fine. Not disconnected it and it is on an Optimate 24/7. I have had no signs or indications that something is wrong, just one day it would not start.

 

I don't have a piggy back, just running a Blitz access ecu.

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Today's "progress". I have checked all connections I can see and find.

 

After trying to start it this morning it did the usual attempting to fire then just turned over.

 

Re-checked to fault codes and it has now stored 78.

 

Bridged the fp and b+ in diag port and I can hear a lot of action in the engine bay, sounds like the pump is priming although I could be wrong.

 

Checked the power to the fuel computer in the rear, all good. Checked the priming voltage to the pump with ignition on and, again, all good.

 

The only thing I can think now is that I have to star replacing coil packs, ignitor, ecu, then work through countless sensors. :shrug:

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Anyone got opinions on what to get first? Coil packs, ignitor, or ecu?

 

One thought would be it the ignitor was buggered then I would not get the initial try to fire. Surely I would just get nothing?

 

Clutching at straws now really.

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Crazy way to diagnose, just bring it to me and I can sort it without just throwing parts at it and hoping ;) You have to put a price on your time or you are just deluding yourself, far better to do something that makes you money and pay someone that knows the car inside out to do an efficient diagnosis and repair.

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Crazy way to diagnose, just bring it to me and I can sort it without just throwing parts at it and hoping ;) You have to put a price on your time or you are just deluding yourself, far better to do something that makes you money and pay someone that knows the car inside out to do an efficient diagnosis and repair.

 

Good advice and much better than throwing parts at the car blindly.

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Crazy way to diagnose, just bring it to me and I can sort it without just throwing parts at it and hoping ;) You have to put a price on your time or you are just deluding yourself, far better to do something that makes you money and pay someone that knows the car inside out to do an efficient diagnosis and repair.

 

 

I know what your saying chris. I might have to take you up on the offer but getting it to you is an issue as it won't start. Will have to get it trailored. I don't suppose you know exactly what's up with it? Cash waiting for the right answer lol.

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