LMM: Help: Motor in limp mode

[MAXOVERMOTOR]

Have a 08 LMM with new motor an SDP twins...motor wont go over 2,000 rpm's,have unhooked batteries 4 times,have reflashed with all different tunes 25 times,nothing changes,have unplugged everything on the motor an plugged back in,have EFI live with Robs tunes ...It up loads tunes fine but changes nothing.
Have good rail pressure and is building boost,motor is mostly stock...
Anyone have ideas,have heard ECM has battery to save tunes and they go bad?

 

[TeaBagger2006]

any codes. that is a fuel related issue

 

[8100 Power]

Friend had that problem on his 08. Clogged fuel filter..

 

[MAXOVERMOTOR]

No codes

 

[MAXOVERMOTOR]

Just running FASS lift pump with 2 new filters,no filter on motor

 

[TeaBagger2006]

you wouldnt happen to have another ecm laying around that you could try?

 

[MAXOVERMOTOR]

Have another truck I could pull one out of...

 

[GMC_2002_Dmax]

Does it display "Reduced Power" on the DIC ???

Check for soft codes like P0299, etc.

In the DTC lists there are multiple codes with the same number, miss one and it can cause a problem.

Good Luck, and get Rob on board to help you through it.

 

[MAXOVERMOTOR]

Displaying no codes at all....truck has full rpm in neutral an park but under load wont go over 2,000 rpm,and nothing changes no matter what tune I put in it....

 

[8100 Power]

Displaying no codes at all....truck has full rpm in neutral an park but under load wont go over 2,000 rpm,and nothing changes no matter what tune I put in it....

Wish it was the fuel filter for you. That's exactly how this one was..

Start with a stock tune(DPF Delete if it's gone) to start ruling out problems.

 

[Bonestock]

Give Trent a call he may point you in the right direction. I had similiar issues with my lmm he fixed.

 

[MAXOVERMOTOR]

I have Rob trying to figure it out now...

 

[bmos37]

What have you done with your MAF sensor? Have you rescaled it at all?

 

[MAXOVERMOTOR]

just bolted it in like I have any other time...

 

[RPM Motorsports]

Maf or intake tube backward? Sensor plug pointing toward engine?

 

[paint94979]

make sure the maf sensor is not in backwards... i made that mistake

 

[MAXOVERMOTOR]

It could be backwards,Im looking at my pics I have of the intake,when i put it together it could go either way..Maf sensor is facing towards fender,but i think it would only fit one way if I remember

 

[RPM Motorsports]

Turn the intake tube around , put the filter on the other side

 

[arneson]

Why would it matter if the plug faced away from motor? What would it do?

 

[MAXOVERMOTOR]

RPM..U might be rite cause my plug wire was short,why would that matter though what way it was facing? airflow?