gstuart · Apr 8, 2019

hi gang

Know there are some very knowledgeable members here and wondering if I may pick ur brains please

With an engine, running I’ve read posts where some have unplugged the injectors to try and establish a noise , I always thought that was a No,no

When there unplugged can the piston actually hit the injectors

Would it matter if it’s a V or inline engine plse

Apologise asking a daft questions, just been reading and didn’t know the answer so thought I would ask the guros here

Many thks in advance as always

Ps, no this isn’t anything to do with mine, lol

Henry_b · Apr 8, 2019

It'll just misfire G

Many a dead injector 'been dealt with, no broken pistons yet

gstuart · Apr 8, 2019

Henry_b said:
It'll just misfire G

Many a dead injector 'been dealt with, no broken pistons yet

Cheers , I did wonder why some done that, so it’s to see by disconnecting them one by one u can see if it makes a difference on each cyl

I always thought it was a no no pulling the injector leads with the engine running

Every day is a school day and that’s why I always like to ask questions to get a better understanding

Henry_b · Apr 8, 2019

gstuart said:
Cheers , I did wonder why some done that, so it’s to see by disconnecting them one by one u can see if it makes a difference on each cyl

I always thought it was a no no pulling the injector leads with the engine running

Every day is a school day and that’s why I always like to ask questions to get a better understanding

Nah she'll be fine, on old tractors i've found a dead or misbehaving injector just by placing my finger on the pipe just above them, you can feel the "pulse" and any irregularity can be felt..

When a diesel has dropped an injector you'll know

gstuart · Apr 8, 2019

Henry_b said:
Nah she'll be fine, on old tractors i've found a dead or misbehaving injector just by placing my finger on the pipe just above them, you can feel the "pulse" and any irregularity can be felt..

When a diesel has dropped an injector you'll know

Cheers , was just curious where I read that a piston can hit and injector , personally never heard of it

Did once hydrolock my old company diesel van, engine did sound like a bucket of nails , oooooops , my boss wasn’t to pleased

Henry_b · Apr 8, 2019

gstuart said:
Cheers , was just curious where I read that a piston can hit and injector , personally never heard of it

Did once hydrolock my old company diesel van, engine did sound like a bucket of nails , oooooops , my boss wasn’t to pleased

I've seen a hydrolock situation from a badly leaking injector, bust the rings and lost compression, so there is an element of surprise with diesels

'twas an old DI ford unit with original 33yr old injectors so, well past it

gstuart · Apr 8, 2019

Henry_b said:
I've seen a hydrolock situation from a badly leaking injector, bust the rings and lost compression, so there is an element of surprise with diesels

'twas an old DI ford unit with original 33yr old injectors so, well past it

Blimey , never seen that, but as u say if it fills up with diesel , then pop

Henry_b · Apr 8, 2019

gstuart said:
Blimey , never seen that, but as u say if it fills up with diesel , then pop

Anything can happen lol

I'm giving it a good redo at the moment, it's coming out of a transit pickup and going into a Nice camper a Buddy of mine has

td4van · Apr 9, 2019

Depends on the type of injector fitted - piezo crystal injectors do not like being disconnected with engine running as they can expand and crack - these type of injectors are fitted to TdV6/TdV8 engines

gstuart · Apr 9, 2019

td4van said:
Depends on the type of injector fitted - piezo crystal injectors do not like being disconnected with engine running as they can expand and crack - these type of injectors are fitted to TdV6/TdV8 engines

Many thks and in the last 3 x years since owning the D3 have been trying to learn as much as I can on the TDV6

Thks again

Nodge68 · Apr 10, 2019

gstuart said:
When there unplugged can the piston actually hit the injectors

Absolutely not.

gstuart said:
Would it matter if it’s a V or inline engine plse

No.

gstuart said:
With an engine, running I’ve read posts where some have unplugged the injectors to try and establish a noise , I always thought that was a No,no

It's not recommended, as the injector drive electronics need a load. If there's no load on the drive capacitors, then it's possible for the energy stored in them to back feed onto the ECU. It's not likely, but is it worth taking a chance on an expensive ECU?

Also reconnecting the injectors with the engine running can cause damage to the injectors themselves.

gstuart · Apr 10, 2019

Nodge68 said:
Absolutely not.
No.

It's not recommended, as the injector drive electronics need a load. If there's no load on the drive capacitors, then it's possible for the energy stored in them to back feed onto the ECU. It's not likely, but it it worth taking a chance on an expensive ECU?

Also reconnecting the injectors with the engine running can cause damage to the injectors themselves.

Many thks, just nice being able to learn off someone who knows what there talking about so know the facts are correct

Most Appreciated and thks again

gstuart

D3 Grandad

Henry_b

Think outside, no box required.

gstuart

D3 Grandad

Henry_b

Think outside, no box required.

gstuart

D3 Grandad

Henry_b

Think outside, no box required.

gstuart

D3 Grandad

Henry_b

Think outside, no box required.

td4van

Well-Known Member

gstuart

D3 Grandad

Nodge68

Well-Known Member

gstuart

D3 Grandad

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