Help injectors stook

[5oo fun]

Hi everyone. I have a chimaera five liter 1997 with twenty 23000miles on the clock.Had no problems with the engine in three years until now.I'm so sad i am missing all the sun.I thuoght i got a misfire on the engine,so i change the plugs + leads + coil.No change.So booked in for a rolling road test,but on the way there the problem got a lot bigger,i use half a tank of fule to get nine miles.On the rollers the guy told me that the injectors had stook fully open,so he checked the fuel pressure,perfect,checked the temp switch,perfect.sent the ECU away,yes you gussed it,perfect.So he as ask me to ask if anybody has had this problem before to try and save some time going through the wiring loom.Any help would be very grateful.would like to see some sun before it gose back to bed for another year.cheers symon.

[Boosted LS1]

Surely, if the injectors were stuck open the fuel pressure would be low? Have you got sooty plugs, black smoke from the exhaust and rising sump levels? You could lift the rail and see if any injectors are leaking when the pump is running.

Boosted.

[5oo fun]

He tested the fule pump and said the pressure was fine from the fule pump.the plugs are sooty and there was a clear smoking from the exhaust with the unburnt fule.The oil has slightly gone up and is getting change after its just been done three weeks ago.

[chassis 33]

Right is it a mechanical or electronic problem???
If it's mechanical then a rebuild or replace will sort it, if it's electrical then you could be in for some fun!!!

This will be a bit of a ramble, but hopefully a bit of back ground will help so sort it. The injectors have a permenet power supply and work off a switched earth in the ECU, bank firing the injectors 4 at a time side by side, it seems a slightly odd idea to start with, but work fine in reality in 95% of applications.

Right, take all the plugs out, then take all 8 electrical connectors off the injectors, crank the engine over. If fuel starts pouring out of the plug holes then its a mechanical problem, probably some crap has got by the fuel filter and holding the solenoid heads open.

My hunch is that you have an electrical problem and the earth wire to the ECU from the injectors has chaffed and is shouring out on something. Disconnect all 8 injector connectors and the connector on the ECU. Test for continuity from pin 11 to earth and pin 13 to earth. If either of these do connect to earth you've found your problem, trace the wire along until you find when it's chaffed!

If you want to be really thourgh the full hotwire system test is here www.rangie.com/articles_topic.php?id=167&cat=7&subCat=51

Regards
Iain

[chassis 33]

Oh and when you do sort things drop a little oil down each bore and crank over a few times before replacing the plugs. With that much fuel in there there's a good chance you've washed the bores.

Regards
Iain

[5oo fun]

He seems to think it a electrical problem.The rest of the information is well needed Chassis, i will pass that on and let you all know the out come by next week.

[chassis 33]

Where are you based?

Regards
Iain

[5oo fun]

Chesterfield Derbyshire.

Edited by 5oo fun on Saturday 22 July 19:27

[chassis 33]

Spoken to Joo (trackcar)? He's based there and knows his eggs, might be worth a look if the above doesn't sort things.

Regards
Iain

[Boosted LS1]

Good posting Iain

Also check the regulator on the fuel rail is still connected to the plenum by the rubber hose.

Boosted.