Injector stuck open on new build engine

[bolton]

Hi all

Currently running in a new forged engine. Have covered 240miles so far!
Running in map by ryan g!
Right out in her today and all of a sudden major miss fire and then cut out completely so coasted to a stop! Also attempted 3 starts of engine to be greeted with black smoke and fuel vapour out the exhaust!!!

Turns out to be injector 2 stuck open (1000cc delphis)
How much damage would this have done to the bore (bore wash)? Misfired for 5 seconds at about 4000rpm and then the 3 attempted starts?

I then towed the car home and cracked my bumper! Lol!
Nightmare day!
Thanks all

[bolton]

Bump

[RyanRs]

Leave the plug out so the vapours can dry and change the oil. Should be OK. I might be tempted to put a tiny amount of oil down the plug hole and crank it over with the plug out (and leads off obv) just to lube up the upper cylinder wall / top rings.

[bolton]

Yeah i hope it will be ok, i have a friend coming out with an inspection camera to double check.

Can you get injectors rebuilt? Although i think this one may be too far gone?
And if i change it to a new injector will i need to check the map?
How reliable are these delphi's?

Cheers

[MartinF]

As far as I'm aware you can only have injectors cleaned, not repaired.

Do a compression test across the cylinders, that should give you an idea as to whether you have done anything long lasting to cylinder No.2.

[ashley]

Yeah i hope it will be ok, i have a friend coming out with an inspection camera to double check.

Can you get injectors rebuilt? Although i think this one may be too far gone?
And if i change it to a new injector will i need to check the map?
How reliable are these delphi's?

Cheers

Borescope is great idea, and like Ryan says- change your oil before you run it again. FWIW I reckon you'll be ok, the cylinder wall shouldn't have glazed that quickly.

Sounds like it's either worth getting all four injectors flow tested, or swapping out for a fresh set. The map should be ok as it's only for running in so should be extremely conservative...if it was a final, all out map then I'd consider a quick check over.

I reckon you'll be ok, but I'd be doing exactly the same thing as you: trying my best to confirm.

[bolton]

Yeah changed oil as soon as i got it home!
So i should get one new injector then get all 4 flow tested?

[ashley]

I'd get all four checked- if one's failing, then there's a risk the others may follow suit shortly- you need to know if it's failed, or just stuck open cos of dirt/ debris in it.

Might be worth changing your fuel filter as well (if it hasn't been done for a while)

[bolton]

Yeah ill order a new fuel filter! They were brand new injectors with only 240 miles on them. Does seem strange! But like you say worth getting them checked out!

[ashley]

Could just be dirt in your fuel lines from assembly?

[bolton]

Wouldnt that shown up earlier than 240 miles in?

[Peter Gidden]

Turns out to be injector 2 stuck open

Or injector driver is foobared.

Have you confirmed it is the injector and not the driver?

[bolton]

Yeah 100% injector it pi*sed out fuel even with the plug disconnected when i tested it.

[Peter Gidden]

Yeah 100% injector it pi*sed out fuel even with the plug disconnected when i tested it.

OK.

Are they genuine Delphi injectors? We had a set of fake paddy field SARD 800s give us a load of issues til we realised they were not genuine.

[bolton]

I believe so brought from a reputable seller in the states who is also an affiliate on mr2oc.com

I have been told its unlike Delphi's to fail tho.

[Peter Gidden]

I believe so brought from a reputable seller in the states who is also an affiliate on mr2oc.com

I have been told its unlike Delphi's to fail tho.

That's why i asked. Injectors are normally highly reliable.

[bolton]

Ill take a pic maybe you could tell me more! Slightly annoyed jus hoping my piston/bore is ok!

[bobhatton]

Ill take a pic maybe you could tell me more! Slightly annoyed jus hoping my piston/bore is ok!

It sounds like dirt in the fuel line that has jammed the injector open, what filter and fuel lines are you using?

[bolton]

Using a walbro 255, 1000cc top feeds (racer x top feed kit), -6AN Redhorse performance fittings, standard toyota fuel filter, braided lines.
Also uprated the fuel pump wiring, removed relay and resistor.

[ashley]

My money's on debris from assembly- maybe a bit of outer braid or something, it's just taken a while to work it's way into an injector and then got itself wedged in there.

Your plan remains the same in my eyes- pull all four injectors and get them inspected by a pro, if it's jammed open they should be able to clear it and capture the debris to give you a clue as to where it came from.

If it is debris, then I would be pulling all the lines down stream of the filter, and the rail and regulator, and cleaning them all very carefully.