Urgent D2 V8 Thor 4.0 won't start.

kurgan · Jan 9, 2024

Urgent Help, my wife's D2 V8 was running perfectly last week. We've spent a lot of money replacing the engine and having some preventative welding done. As of 2nd Jan it will crank but won't start. Battery was replaced yesterday 8/1/24. Turning the key the the battery light is on and the check engine light comes on later. The exhaust makes pops and bangs.
I really need to get this resolved asap as it's due an MOT in the next few days and she needs her car for work.

Any suggestions for a quick resolution thanks in advance.

Craig.

kermit_rr · Jan 9, 2024

Have you read any fault codes? Have you tried disconnecting the maf?

kurgan · Jan 9, 2024

I don't have any type of code reader. I'll try to start and disconnect MAF.

kurgan · Jan 9, 2024

kermit_rr said:
Have you read any fault codes? Have you tried disconnecting the maf?

I don't have a fault code reader. I'll try the MAF disconnect.

marjon · Jan 9, 2024

Was the battery disconnected and a good earth during welding?
do you have good pressure at the fuel rail?

J

kurgan · Jan 9, 2024

marjon said:
Was the battery disconnected and a good earth during welding?
do you have good pressure at the fuel rail?

J

Yes, the battery was out of the car. It was done by a professional welder/mechanic.

Where/how can I check for fuel pressure. I know how to do basic stuff. Plus I'm on a driveway I've got no cover or garage.

It was running perfectly last week.

marjon · Jan 9, 2024

There will be a shrader type valve on the fuel rail ( visible) if you don’t have a gauge, position 2 on ignition and it should give a dam good squirt ( dont get your face in the way).
Take it all plugs and leads have been checked? Winter is a great shower of weaknesses.

J

kermit_rr · Jan 9, 2024

marjon said:
There will be a shrader type valve on the fuel rail ( visible) if you don’t have a gauge, position 2 on ignition and it should give a dam good squirt ( dont get your face in the way).
Take it all plugs and leads have been checked? Winter is a great shower of weaknesses.

J

It should have good pressure even with ignition off.. don't know about the d2 but on the 38 you could barely reach it, let alone see it

kurgan · Jan 9, 2024

marjon said:
There will be a shrader type valve on the fuel rail ( visible) if you don’t have a gauge, position 2 on ignition and it should give a dam good squirt ( dont get your face in the way).
Take it all plugs and leads have been checked? Winter is a great shower of weaknesses.

J

I'll be checking the plugs and leads at the weekend.

kurgan · Jan 9, 2024

kermit_rr said:
It should have good pressure even with ignition off.. don't know about the d2 but on the 38 you could barely reach it, let alone see it

I'll have to wait for daylight hours to go fiddling.

marjon · Jan 9, 2024

kermit_rr said:
It should have good pressure even with ignition off.. don't know about the d2 but on the 38 you could barely reach it, let alone see it

Yes, but when you turn on the ignition it should prime (should it?) so up to pressure.
but yes you are right it should hold pressure for next start.
It’s clearly visible on my 4.6 don’t see why the 4.0 should be much different, Gems though

.

Just trying to think of things as the lack of diagnostics.

J

kermit_rr · Jan 9, 2024

In the Thor, it's a U shape and the Schrader is right up near the bulkhead facing to the rear, under the upper manifold

kurgan · Jan 9, 2024

kermit_rr said:
In the Thor, it's a U shape and the Schrader is right up near the bulkhead facing to the rear, under the upper manifold

Do you have a screenshot of where it is? Thanks.

Henry_b · Jan 9, 2024

Nope there isn't a schrader valve on the thor..

Easier way is to pull a sparkplug and see if they're wet with fuel..

kurgan · Jan 9, 2024

Henry_b said:
Nope there isn't a schrader valve on the thor..

Easier way is to pull a sparkplug and see if they're wet with fuel..

I'll pull the plugs at the weekend. It's trying so hard to start but just can't.

kermit_rr · Jan 9, 2024

Henry_b said:
Nope there isn't a schrader valve on the thor..

Easier way is to pull a sparkplug and see if they're wet with fuel..

mine certainly had one, it was right next to where the fuel pipe connected

Henry_b · Jan 9, 2024

kurgan said:
I'll pull the plugs at the weekend. It's trying so hard to start but just can't.

kermit_rr said:
mine certainly had one, it was right next to where the fuel pipe connected

tis blank unfortunately

kermit_rr · Jan 9, 2024

Henry_b said:
tis blank unfortunately

i'm sure I unscrewed the cap to look, but didnt get any further. its a long time ago now though

Henry_b · Jan 9, 2024

kurgan said:
I'll pull the plugs at the weekend. It's trying so hard to start but just can't.

Crank position sensor is common, also check the coolant temp with diag as the sensor can fault to 140c and stop the motor running..

Henry_b · Jan 9, 2024

kermit_rr said:
i'm sure I unscrewed the cap to look, but didnt get any further. its a long time ago now though

I tried to unscrew it, just a blank on mine could of been different on yours,

*Urgent* D2 V8 Thor 4.0 won't start.

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