Intermittent power loss 110 V8

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Matt1664

Member
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Hello newbie here. I have a 96 110 4.6 v8. Long term issue that is intermittent. I am currently driving from UK to Ibiza. Happily cruise at 65/70 on the motorway then after two hours, maybe slight uphill, when I press on the gas, popping from exhaust and no power. Has happened several times after a few hours of driving. Fortunately I have been able to pull in, wait 15 mins and then back for it to happen again 45 mins later. First thought it was the ECU overheating as the amp has been positioned under the seat with the ECU. Amp all a
Unplugged now. Thinking some fuel blockage in the tank. I’ll begin driving this morning and it will be ok for two hours and then same will happen again.
Thank you
 
Could well be a heat issue given the temperature's in Europe at this time. What does your temp gauge say? Is engine cooling fan working?
 
Temp gauge reads below half. Gets very hot under passenger seat, partly caused by the amp overheating. That is now disconnected. Haven’t experienced much heat yet as drove through a wet France and currently in Ezcaray northern Spain. I’ll be setting off again soon so expect it to happen again in about 2 hours. Got my daughter travelling with me so keen to reach a safe stopping location each time it happens - thanks for your reply
 
tottot said:
Could well be a heat issue given the temperature's in Europe at this time. What does your temp gauge say? Is engine cooling fan working?
Click to expand...
IMG_1667.jpeg
 
Nice looking truck.
I don't know what set up your V8 has be it in tank electric lift pump or an external one, suspect the former.
V8's can be sensitive to fuel delivery pressure as a result of partially blocked filter or **** poor performance of the lift pump. The fact that it fails when ask for more power points this way.
 
Stopping every hour for 15 mins. Seems ok atm. But only been driving for 2 hours so wouldn’t expect it to happen until at least 2.5/3 hours. Certainly point in the direction of the fuel pump area. Whatever is happening 10/15 mins rest seems to solve it until next time. Is something resetting? Something cooling? Or something in the tank and filter that settles? It’s a mystery
 
Update. So bang on three hours sudden loss of power. Fortunately was 3 km away from services in Zaragoza. Had been running fine up until then. Can anyone shed some further light please
 
Matt1664 said:
Update. So bang on three hours sudden loss of power. Fortunately was 3 km away from services in Zaragoza. Had been running fine up until then. Can anyone shed some further light please
Click to expand...
Something is getting hot & breaking down.
Coil/ Leads/cap/rotor arm also check centre probe in the cap. These know to be dodgy.

Once it’s running again can you go quicker for a long time to rule out fuel starvation?
 
my initial thoughts too. However yesterday after yet another power loss episode, I pulled over for 5 mins and then I was good to go once again.
 
Assuming this is the 4.6 (p38 engine) and as you mention ecu it is still running coil packs and not had the front converted to distributor.

The Crank Position Sensor can get intermittent breaking down with heat, if your coil packs are in original position they may suffer the same from heat being tucked on the back of the engine.
As can obviously the plug leads & plugs

What fuel are you using now as I take it it’s only just started since being in Europe?
Does it make a difference with the fuel level? Although this surely wouldn’t be so predictable with your timing ;)

But does sound like something breaking down due to heat.

Good luck with the rest of your journey.

J
 
marjon said:
Assuming this is the 4.6 (p38 engine) and as you mention ecu it is still running coil packs and not had the front converted to distributor.

The Crank Position Sensor can get intermittent breaking down with heat, if your coil packs are in original position they may suffer the same from heat being tucked on the back of the engine.
As can obviously the plug leads & plugs

What fuel are you using now as I take it it’s only just started since being in Europe?
Does it make a difference with the fuel level? Although this surely wouldn’t be so predictable with your timing ;)

But does sound like something breaking down due to heat.

Good luck with the rest of your journey.

J
Click to expand...
Appreciate your response. Using 95.
 
marjon said:
Assuming this is the 4.6 (p38 engine) and as you mention ecu it is still running coil packs and not had the front converted to distributor.

The Crank Position Sensor can get intermittent breaking down with heat, if your coil packs are in original position they may suffer the same from heat being tucked on the back of the engine.
As can obviously the plug leads & plugs

What fuel are you using now as I take it it’s only just started since being in Europe?
Does it make a difference with the fuel level? Although this surely wouldn’t be so predictable with your timing ;)

But does sound like something breaking down due to heat.

Good luck with the rest of your journey.

J
Click to expand...
Still trying to work out what affect the fuel level has. Why would stopping for 10 mins cure it for the next 30 mins.
 
Matt1664 said:
Still trying to work out what affect the fuel level has. Why would stopping for 10 mins cure it for the next 30 mins.
Click to expand...

If the pump was breaking down from use/time? I don’t actually think it’s fuel as a first port of call.
fuel level drops it’s harder work for the pump.

Did you do this sort of driving in the UK?

J
 
marjon said:
If the pump was breaking down from use/time? I don’t actually think it’s fuel as a first port of call.
fuel level drops it’s harder work for the pump.

Did you do this sort of driving in the UK?

J
Click to expand...
Nowt happened in the UK. Drove from London to Norfolk and back in recent weeks. Drove to pompey for the ferry all fine. Hit France and bang. France was wet and relatively cold.
 
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