Fuel flooding on Bank 1

[votan]

Just a few days ago, my engine (TVR Tuscan RR) began to throw smoke out of the right muffler. But not always.... was mostly gone after opening up the throttle for a short time...
But things got worse.... smoke got horrible and it smells just like the engine isn't buring most of the fuel on Cyliders 1-3.
Then I couldn't even start up the engine as it did not fire up anymore..
And when the engine stoppt turning when cranking, I realized, that some cylindes are probably blocked by tons of fule in their combustin chamber. So I unscrewed the sparkplugs and cranked the egnine... the cylinders from bank one spilled out A LOT of fuel....
I then measured the ignition cables and plugs.. all fine.
I've tried testing, if all sparkplugs are bringing a good spark.... not sure if that's the case... looks like sometimes there is a spark and sometimes not!? But might also be that I just couldn't see it correctly!?
Before I completely dismantel the engine... what other causes can it be?
Fuelpressure, Injectors, Coil etc?

Edited by votan on Thursday 17th July 09:36

[twinreal]

First thing to do is to connect the diagnostic software and take a look at the AFR values. Maybe you also have logged errors. Seems that bank 1 is running too rich.
This can be due to a faulty lambda / lambda connection / out of sync or leaky throttle body
If all above isn't the case, another cause can be the coil pack or leads. Maybe you have a infrared thermometer and can measure temps on every single manifold of bank 1 to find out which cylinder is involved.

Edited by twinreal on Thursday 17th July 10:17

[votan]

Thanks. Already checked the diagnostics.. Lambda and all other values looked ok. Couldn't find any logged error codes... but maybe that's because I couldnd find any option to view error logs!? Or where do they get displayed?
I'll receive a spare coil pack and new leads today... see if that changes anything. Throttlebodies look fine so far...
I'll also recheck Diagnostics...

[EvoOlli]

Diagnostics won't show any faults when a injector doesn't close properly ;-) Best and easiest way to find out: Turn on Ignition / Alarm so the fuel pump will be on for a short time to build up fuel pressure. Check 10 minutes later if there's still pressure on the fuel line. If not, you could have an injector problem.
Repeat with disconnected electric connections to the injectors.
Check each injector.

[NWTony]

I think I had a similar problem with the injectors constantly open, mind you the car ran like a pig so it might be something diffrent. In my case it was a breakdown in the wiring to the injectors, you can temporarily fix it by splicing into another injector wire off the same bank as they batch fire 1-3 and 4-6.

Diagnose it by disconnecting an injector at a time and see what makes a difference.

Weirdly despite chucking neat petrol from one exhaust the ECU didn't pick up a fault!

Normal caveat - it's my mate who knows about cars, I just parrot what he tells me

[votan]

I've spend the last days with checking everything... got the injectors out and cleaned/checked at a Bosh service... new Leads and coil pack installed. Pressure in fule rail doesn`t drop after a few minutes.
Maybe I have some more info that might point into some direction.... the problem started, when I had the car standning for a while and when I took it for a drive, I ran out ouf fuel a few meters away from the gas station (That's why I had the injectors checked and cleaned). After refuling the car ran lumpy for a short time but then all was fine again... a few days later, the car lost power and smoked from the right muffler like it is on fire. I stopped the car and gave a bit of throttle for a few times... suddenly full power was there again and smoke was gone. This started to happen more often then.... and now is persistent.
Cylinder 1 and 3 are flooded with fuel after a few seconds.... Sparks are fine on all cylinders and after drying the cylinders they actually do fire up a few times, till there is to much fuel in again.
Cylinder 2 seemt to be completely dry though... like it is getting no fuel at all.
Is there anyway to easily check if all injector leads are working and sending the right signal? Or could it even be the ECU?
Using MBEtool does not show any issues.... injector times are fine, lambda fine, temps fine, throttle fine etc...

[twinreal]

You can switch the connectors of injector 1 and 2 or 2 and 3 to see if the problem goes to cylinder 2.

[PetrolHeadPete]

Just a few random ideas:
1. Try turning the ignition on and immobilizer disabled (pump primed)but dont run engine. Use a DMM and measure the voltage between the 2 pins on each injector plug (pop each one off in turn) and see if there is any voltage present between them. They should all be 0V. I wonder if one or more of the output solenoid drivers has failed so that it energizes the injector all the time, rather than pulsing it.
2. Its not to do with the throttle balance pipes and their connection to the carbon canister is it ? Could it be pushing fuel back around that hard black piping and into the throttle bodies via the balance bleed holes/linking pipes etc ? Guess you can prove by pulling off the pipe at the far left and right ends and see what happens (it wont dramatically change the running of a normal car at idle)