Ignition problem?

[john84]

Hi all,

I've just finished an engine rebuild and swap on my supra. (bought a new supra and put another engine in it, rebuilding while i had the chance.)

anyway, having put about 500 gentle miles on it to run it in it let me down on my way to work with what i thought was either fuel starvation or an ignition problem.

The car would tick over fine, but as soon as i tried to pull away it just died. once the car had cooled a few hours later it ran fine for a while (6 miles or so) and then the same thing again.

with the car towed home (ticking over all the way) i checked for codes and got code no: 14, armed with this info i changed the coil packs and leads for a known good set, when i tried the car i only got 1 mile before it died. the next morning i changed the ECU for another and the car ran fine for 200 miles or so before having the same problem again, it was towed home and left for the night.

the next day it ran fine for a couple of hours but as i hadn't done anything to fix it, i changed the igniter for a known good one, however a couple of hours later the problem arose again (although not as bad) and i'm at a bit of a loss really. the plugs have only done 1000 miles and if a plug went down then it would run on 5 and still drive (badly)

My thoughts are to change the cam postion sensor and maybe AFM just to rule them out as i've got spares (a whole other car)

any idea's or suggestions would be great as i'm supposed to be going away in it at the weekend, thanks in advance,
John.

 

[john84]

Does nobody have any suggestions?

 

[supraguy@aol]

Have you had any new codes since changing all of those items out?
What is your fuel pressure showing?
What mods do you have?

 

[Txsupra]

Do you have an after market FPR? If not test fuel pressure at the rail while running to see if your loosing pressure, or not getting enough. Use a stethoscope or screw driver to listen to the injectors for any odd sounds other than a steady tick-tick-tick. Sounds like you have changed all of the major ignition components. Could be a bad or maladjusted TPS. I'm not up on what the codes mean, (I run stand alone). Its odd that the amount of time or mileage is inconsistent. Does the motor just die, does it struggle to stay running, can you recover it when it starts it death cycle?

 

[john84]

My mods are, full 3" exhaust and downpipe, 57 trim turbo running standard boost until i can get it 100%, metal HG and ARP head studs.

i only get code 14 after the car has died, at the mo it's clear.

When it dies it's mainly under load, it will tick over on 6 and somtimes revs up not too bad in neutral, it seems to get worse the more you try to keep it going. I'm thinking it might be fuel related as you guys suggest.
when the car is running it smells a bit rich to me and i do get the odd backfire in the rear silencer when lifting off or changing gear, and the ignition timing is correct as per the tsrm but still sounds retarded to me but i've resisted the temptation to advance it to where it runs smoother.

I will try the screwdriver suggestion and listen to the injectors, but i'm not sure how to go about checking fuel pressure. i've run some injector cleaner through in the hope that it helps.

I shall try checking the tps adjustment just to rule it out.

 

[jetjock]

No IGf = code 14. Code 14 = no injection. No injection = engine stops...

 

[hvyman]

How come the TSRM says Igniter and ignition coil circuit.

 

[paradox616]

i know you mentioned it earlier that you originally got a code 14, after resetting the ecu (disconnecting battery for a bit) do you still get a code 14 after it dies?

When it "dies" does it start back up straight away and idle only to die when you try to take off? or won't it start?

 

[jetjock]

How come the TSRM says Igniter and ignition coil circuit.

It says that because those are the items likely (but not always) to be involved with a loss of IGf, since the igniter generates it from the primary circuit's flyback. Therefore no ignition = no IGf. More correctly, no primary triggering = no IGf.

 

[Nick M]

How come the TSRM says Igniter and ignition coil circuit.

Why would it say something different?

 

[john84]

i know you mentioned it earlier that you originally got a code 14, after resetting the ecu (disconnecting battery for a bit) do you still get a code 14 after it dies?

When it "dies" does it start back up straight away and idle only to die when you try to take off? or won't it start?

After problems i always get code 14, the engine management light just flickers on when it's spluttering. it will usually tick over just fine, even as i coast to the side of the road, then splutter and die when i try and pull away.

it's been fine for a couple of days now but i would like to find the problem as i suspect it will come back at some point.