LS Engine Fueling - Essex?

[Linkin]

Hi HSV guys

I just thought i'd jump over to your forum to see if anyone can point me in the right direction...

I have a LS2 engine which is suffering some fuelling issues.
Does anyone know of a LS engine expert around north Essex who may be able to help?

Thanks in advance
Linkin

[M11 MFP]

Linkin said:

Hi HSV guys


I have a LS2 engine which is suffering some fuelling issues.
Does anyone know of a LS engine expert around north Essex who may be able to help?
Linkin

No enough info. What's in control of the fuelling? If its e38/40 or 67 then Monkfish or Richard Ingram may be able to help with either HP tuners or EFI live. Aftermarket ECU, best speak to the distributor.

If it's a transplanted engine or homebuilt installation, perhaps Dynotorque would be worth a call.

[stevieturbo]

Linkin said:

Hi HSV guys

I just thought i'd jump over to your forum to see if anyone can point me in the right direction...

I have a LS2 engine which is suffering some fuelling issues.
Does anyone know of a LS engine expert around north Essex who may be able to help?

Thanks in advance
Linkin

As above, it can depend what the actual problem is.

Torque Developments are in Essex and shouldnt have too many problems sussing things out

Depends on what is actually wrong as to whether it needs any sort of expert though

[Boosted LS1]

^ As above. It may be nothing to do with the software. Could be a mechanical issue. The first thing I'd check would be fuel rail pressure and if it's maintained. Any leak in the rail or injectors will make your consumption high. A local garage may be able to do that for you.

[Linkin]

Cheers for the responses guys.

I thought the problem was ECU (it runs with a stock GM ECU).
Richard has been over and checked it out with EFILIVE and whilst the map wasn't entirely stock it certainly isn't the cause of the problem.

In slightly more detail, under load i get a large 'moment' which according to Richards diagnostics is due to no fuel being available. The application has a standard FPR and the FPG is steady at 58psi.
The fuel pump seems ok, as the fuel pressure seems steady, even mid-'moment'

Due to what has been ruled-out, Richard has suggested it's probably best to look at the spark being the problem, so focusing coils, loom etc.
My automotive experience with such witchcraft is a big fat zero, hence the need for some help and expert guidance!

[Mud_]

Not sure I follow - if no fuel is available (i.e. crazy lean fuel mixture, even no fuel) then I wouldn't be quick to blame the spark. Did Rich think no fuel by looking at the narrowbands? Maybe look at the injector loom? I assume you are getting more bad behaviour than a single injector could cause. All FWIW...a good garage needed by the sound of it!

[stevieturbo]

More details.

Has this ever run correctly ? Is this a new problem ? Any work prior to this problem ? etc etc etc etc

[badboyburt]

stevieturbo said:

As above, it can depend what the actual problem is.

Torque Developments are in Essex and shouldnt have too many problems sussing things out

Depends on what is actually wrong as to whether it needs any sort of expert though

Another recommendation for Torque Developments here, great service from the guys.

http://www.tdi-plc.com/

[Linkin]

stevieturbo said:

More details.

Has this ever run correctly ? Is this a new problem ? Any work prior to this problem ? etc etc etc etc

Hi Stevie,

No, it's not a new problem, it's always been there from point of purchase.
The LS is in a newly built kit-car. The problem is relatively easy to drive around, i.e. there is so much torque and so little weight that short-shifting and a light throttle still results in a very rapid little car.
Another chap mentioned it may be a poor wiring/loom issue, but i don't know of anyone locally who could fix it.

[Linkin]

Mud_ said:

Not sure I follow - if no fuel is available (i.e. crazy lean fuel mixture, even no fuel) then I wouldn't be quick to blame the spark. Did Rich think no fuel by looking at the narrowbands? Maybe look at the injector loom? I assume you are getting more bad behaviour than a single injector could cause. All FWIW...a good garage needed by the sound of it!

Cheers Mud
It's not a single injector so yes, the injector loom is a suspect.
Hopefully someone comes recommended who are in my neck of the woods (Colchester, Essex)

[stevieturbo]

Linkin said:

Hi Stevie,

No, it's not a new problem, it's always been there from point of purchase.
The LS is in a newly built kit-car. The problem is relatively easy to drive around, i.e. there is so much torque and so little weight that short-shifting and a light throttle still results in a very rapid little car.
Another chap mentioned it may be a poor wiring/loom issue, but i don't know of anyone locally who could fix it.

So has the ecu ever been tuned correctly for your setup ?

Is the engine mechanically healthy ?

Purchase...dealer, private, builder ? Can they shed any light on the problem ?

[irocfan]

you could think outside the box - there's a co in your neck of the woods called GT101 (who look after ford GTs and will apparently be looking at late model mustangs) while they are likely not going to be able to help you they may well be able to recommend a specialist company who could (a lot of the US car world seems to stick together for obvious reasons)

[Mnchsv]

If your stuck I'm in Hertford ill have a look for you