[solved] 740 turbo wont start

cr80442

Alrighty, I bought this 740 turbo its been sitting for a while. Firstly the fuel pump relay was buggered so I've bypassed with a wire and switch for now. The pump does work you can hear it and it doesn't sound bad. I've syphoned old fuel out and put 20 litres of 98 in so its deffs got fuel but the gauge shows its empty IDK why. Its spluttered with start ya bastard but that's about it so it gets spark. Tomorrow I plan to clean the engine bay even more as it's still pretty dirty and check everything. I had a quick look underneath and the filter looks new. Tommorrow I'll jack the car up and have a better look. So yeah any tips on this would be great cheers.

Vee_Que

Distributor sensor. sputtered doesn't match running. Also by bypassing the fuel relay you can have caused other issues as the fuel is linked to the ignition. Try the brickboard diagnosis /faq page.

Rob

it is amazing how quickly fuel systems can deteriorate from sitting. My 262 had sat for a couple of years and i found this when I pulled the pump out of the tank.

doesn't mean yours will be like this, just saying don't assume the fuel system is good just because you can hear the pump running.

cr80442

Vee_Que;110325 wroteDistributor sensor. sputtered doesn't match running. Also by bypassing the fuel relay you can have caused other issues as the fuel is linked to the ignition. Try the brickboard diagnosis /faq page.

How could i test the dizzy sensor

cr80442

I cracked the fuel filter line and turned the pump on and lots of shitty yellow fuel came out I let it go until fresh fuel I put in started flowing, the pump and filter look new and they are not clogged from this test. Time to check fuel rail stuff

volvo1975

Change engine coolant sensor.. blue for turbo

volvo1975

Fuel pressure regulator also

volvo1975

740 are known for temp and fuel gauge inaccurate readings

cr80442

The coolant leak is fixed and I have a new fuel pump relay but it still doesn't want to start. Idk why

volvo1975

Is the fuel getting to fuel pressure reg

volvo1975

Coolant sensor is important part we had a no start 740 was coolant sensor

cr80442

I pulled the fuel line off the pressure regulator and cranked the car and no fuel was coming out. Does that mean no?

cr80442

volvo1975;110990 wroteCoolant sensor is important part we had a no start 740 was coolant sensor

Which one is the coolant sensor? Is it this?

cr80442

The sensor on top right of radiator it's not letting me post images idk why

cr80442

Turned the fuel pump on with the switch and fuel is coming out of pressure reg

volvo1975

The coolant sensor is under manifold above 3 rd cylinder has blue plug for turbo black plug for non turbo its for the ecu if you have small hands ya can get it done without taking manifold off..also there a relay on drivers side shocky tower turn key hold see if it clicks

cr80442

I don't see a relay on the shock Tower, also what would I do with the sensor after taking it out

jamesinc

Just unplug the sensor. The computer should assume cold engine and go rich.

But start with isolation. Put 12V directly to the fuel pump circuits and see if the pumps start.

cr80442

jamesinc;111011 wroteJust unplug the sensor. The computer should assume cold engine and go rich.

But start with isolation. Put 12V directly to the fuel pump circuits and see if the pumps start.

My fuel pump does start and works fine. I'll unplug the coolant sensor and see if the car starts

cr80442

Unplugged the coolant sensor, car still doesn't start.