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The mkiv Supra Owners Club

Car won't run.... Help!


cloudder

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Hi Guys,

On the way to work this morning, car nicely warmed up cruising nice. then suddenly without warning the engine cuts out... still coasting, after a couple of seconds the engine fires up on its own and is sweet.... 10 seconds later the same thing happens... engine cuts.... dead this time.

Managed to coast off the road. Turn the ignition off. Go to start again, fires up instantly for about 2 seconds then stumbles for a second or 2 then dead. Checked the operation of the immobiliser and seems good. Tried a good dozens times during the morning but the same thing. If I keep kicking down on the throttle the engine will keep running very iratically, but not enough power to run in gear.

I am guessing fuel?

Any ideas?

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Does it sound like its miss firing?

 

I would suggest always start with the simple things, check nothing has come loose and then swap the plugs for a cheap set.

 

No warning lights? Seems odd that 10 miles after filling up, def not put the wrong fuel in? Check your receipt

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  • 2 weeks later...

Hi,

 

Found some time to look at the Supra today. Jumped in the car and it started straight away and ran again for 2 to 3 seconds then dies.

Anyway shorted the diagnostics plug, but it showed no faults, but the engine check light pulsed constantly, along with the overdrive light on the dash!

Looked at the diagnostics document on line for the engine and noted that stalling directly after start up could be the 'fuel control circuit' I have checked that there is 12V being fed to the pump contol computer in the boot, and there is a constant 4.5v at the same plug (pins 1 & 3) when cranking. Finally I shorted the diagnostics plug to check to see if the pump ran and I can hear it clearly in the boot. Bad light stopped play, so I forgot to get my wife to start the car as I listened to hear whether the pump stopped when the engine cuts out, or attempts to carry on pumping fuel? The diagnostics char stated it could then be the ECU, but I'm not convinced, as if the ECU had died, surely the engine wouldnt run normally for the first few seconds? Any thoughts where to look next?

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Hi Ian

Got my paper clip out today and bridged the 2 pins you said and the car runs a treat!!

Do you know what this proves? I image shorting between the pins short circuits the fuel pump controller and main ECU?

I suppose what I am asking is by swapping out fuel pump controller for another the answer, or is there still dodgey sensors somewhere? Would I be OK assuming the main ECU is fine as the car seamed to run as normal? Admittedly, I only ran the car in this mode for about a minute to 2 minutes, in case I was screwing something else up?

Any ideas?

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  • 3 weeks later...

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