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The mkiv Supra Owners Club

Car won't start - what could be wrong?


adam1983

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Thanks mate. Will see what the guy from the garage says tomorrow. He is coming down to locate the problem and hopefully will have it fixed before the weekend.

Don't want to miss the hooters meet :)

 

I've got a spare FPC here if that turns out to be the issue.

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Adam, did you have anymore joy with trying a different fuel pump?

 

Sorry to hijack your post, but im having the same sort of issue.

 

To put evryone in the picture this is what happened.....

 

I was driving home Sunday night and I stopped at a petrol station. I filled up with petrol, then when I started the car my phone which was charging said 'danger high voltage', then moments later returned to normal. The car started fine. Nothing seemed wrong. I pulled out onto the main road, then 300m down the road the car cut out. I managed to roll into a layby where I tried to restart the car. It turned over then cut out. I could smell a faint smell like burning electrics. I managed to get picked up, then returned with a car trailer yesterday and got the car home.

 

Im running a fairly standard TT6 with no aftermarket ecu, boost controller etc.

 

Ive had a look around to see if there are any obvious signs, but nothing. There is voltage to the coil packs. Ive lookedat the ecu wiring and it all seems fine. The relays are clicking and all the fuses are how they should be. I too thought there maybe a problem with the fuel pump, but without checking the pressure I cant be 100% certain. I do have a spare bigger pump, but if you crank the engine over there did seem to be quite a lot of pressure from the old one.

 

Anyone else got any ideas? Is the crank sensor a common fault? Is it easy to change? Any help very much appreciated

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Trying to source a new fuel pump.

Going to change the filter too which I may as well.

Are you hearing the fuel pump when you turn the key? If so does the sound go away after a few seconds?

Reason I ask is because mine stays on and at the gauge is not making enough pressure.

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Trying to source a new fuel pump.

Going to change the filter too which I may as well.

Are you hearing the fuel pump when you turn the key? If so does the sound go away after a few seconds?

Reason I ask is because mine stays on and at the gauge is not making enough pressure.

 

Well we tried cranking it over with the high pressure connection only loosely on and it did spray fuel. I would need to double check, but I think it does go off. Doesn't really explain the high voltage message on my phone and the faint buring smell though. I just hope I haven't cooked my ecu. The ecu looks fine and there is no sign of any melted wires.

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I have a brand new Walbro pump that I was going to fit as part of my plans to up the power slightly. Just never got round to it.

 

I would check all the wiring behind the dash, especially as you can smell it, something could have shorted like the stereo harness and caused various problems. Its quite common for the wiring behind the dash to be a real mess with aftermarket stereos, alarms, gauges etc.

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It will be in the tank mate, where the hose attaches to the pump. Not saying its certainly whats wrong, but its worth checking.

 

Thanks mate. Will have a word with my mate at the garage about getting it there. No idea how I'm gonna get it there yet though. Not sure how legal pushing it 100 metres down the road is :)

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Just crimp off the return line near the rail, pump should make its full pressure, well over 100 PSI I would have thought. If the pressure comes up with the return line blocked (be careful a pipe doesn't blow off doing this....) then you need to do a flow test. Put the return line that normally goes back to the tank in a bucket, time the fuel on time and run the pump for 30 seconds. Measure fuel delivered, multiply by 2 and check against litres per minute rate the pump should give. If that's pretty much OK change the pressure regulator. If it's one of those pile of *&^% Aeromotive things buy a proper one. They are made by Bosch..... :) So are good fuel pumps.... Try not to set yourself alight ;) Don't get addicted to the smell ;)

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I would check all the wiring behind the dash, especially as you can smell it, something could have shorted like the stereo harness and caused various problems. Its quite common for the wiring behind the dash to be a real mess with aftermarket stereos, alarms, gauges etc.

 

Well my stereo and all other electrics seem fine. The car does seem to want to start over. Im going to double check i haven't done something stupid like put diesel in the car. It does smell of petrol, but i might drain a bit out the tank just to be sure. Otherwise i want to check the crank angle sensor. Can anyone tell me where to find it? Any help would be appreciated.

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Is there a spark at the plugs? If so it's very unlikely to be the crank position sensor. They usually fail totally and give no spark and no injector pulse. Are the injectors pulsing? If you don't have the right gear you are going to struggle to diagnose it efficiently, I'd get it to any good garage with a good record of electrical diagnosis. Very occasionally the trigger disc on the crank cam belt sprocket moves in relation to the crank and the injection and ignition timing is then out. A simple timing light with the no 1 coil pack connected with extension HT leads will show that fault.

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