Engine Problems!

[dalaughingbuddha]

Hi Guys,

I've got an 06 350GT Sedan with a strange engine problem.

I had a problem where i would be driving at any maintained speed and the car would start surging violently, i took it in and had the throttle body reset which solved the

surging but now i've got a new problem.

When i accelerate from a stand still regardless of if the car is warm or not as i accelerate the engine feels like its going to stall like the engine is starving, i put my foot down and it backfires and away it goes.

it doesn't do it all the time but its getting annoying and i'm worried its damaging the motor.

I always run 98+ fuel from BP or Shell.

Does anyone know what the problem is or anyone in the western sydney area that can diagnose it?

Thanks

[scotty nm35]

Fuel filter? Blocked injector?

Sounds like it's running very lean.

[dalaughingbuddha]

Scotty, I've run some injector cleaner through it but made no difference. Any idea what would cause it to run lean?

[PN-Mad]

Line off the plenum, intake leak basically, unmetered air entering into the motor.

[scotty nm35]

Lack of fuel, too much unmetered air... There could be a hundred reasons. Fault finding like this can be a headache without a Consult3, it might be worth taking it to a mech. Where are you located?

Intank injector cleaner won't unblock an injector, the only way to test them is to see the spray pattern and measure the output flow. If you were local I could do it for you cheap, otherwise if you can rip them out and get an injector specialist, or ship them down to me, they can be easily cleaned and tested.

Have you changed the fuel filter at all? 8 years on the original might be pushing it, but if the fault is intermittent... I doubt that is the cause.

Could be a bad plug or earth problem. You could get the voltage at the injector plug checked.

Like Alex said, a vac leak could be the cause, especially as it seems to be low down more so than up high in the revs. Check the brake booster isn't leaking, or some hose hasn't snapped by pressure testing the intake.

The AFM could be dirty or covered in oil, especially if you have a gay K+N pod hanging off it...

[dalaughingbuddha]

PN-Mad, any recommended mechanics int he area that could diagnose and fix it? any idea on cost?

Scotty, i'm in Western Sydney and there is no gay K+N hanging off anything lol. Engine wise car is stock.

Edited July 29, 2014 by dalaughingbuddha

[colin.ssc]

Hijack

Scotty, what do you recommend using to clean the AFM?

[rambocarebear]

I had the same problem on my old 33 - turned out to be bad connections in the afm which i re soldered. To my surprise it fixed the bad idling and studdering on accelrate permanently! saved replacing a $200+ part.

[PN-Mad]

PN-Mad, any recommended mechanics int he area that could diagnose and fix it? any idea on cost?

Scotty, i'm in Western Sydney and there is no gay K+N hanging off anything lol. Engine wise car is stock.

I would start with anyone with a smoke machine/intake pressure tester, and a obd2 reader.

Hijack

Scotty, what do you recommend using to clean the AFM?

AFM/MAF cleaner....

There is a product. Brake cleaner is too harsh and can leave a residue.

Also, you can't resolder a vq35 afm. It's a little different to a RB.

[scotty nm35]

I would start with anyone with a smoke machine/intake pressure tester, and a obd2 reader.

AFM/MAF cleaner....

There is a product. Brake cleaner is too harsh and can leave a residue.

Also, you can't resolder a vq35 afm. It's a little different to a RB.

^^ This.

CRC do an AFM cleaner. Make sure you let it dry well before plugging it back in, as it has a microprocessor inside.

[colin.ssc]

AFM/MAF cleaner....

There is a product. Brake cleaner is too harsh and can leave a residue.

Also, you can't resolder a vq35 afm. It's a little different to a RB.

=P totally knew that...just thought any specific brand

^^ This.

CRC do an AFM cleaner. Make sure you let it dry well before plugging it back in, as it has a microprocessor inside.

CRC? Ok shall have a look...think I should clean mine one of these days considering I have the shitty K&N pods

[scotty nm35]

think I should clean mine one of these days considering I have the shitty K&N pods

Now illegal on AFM equipped cars for this very reason apparently.

[colin.ssc]

Now illegal on AFM equipped cars for this very reason apparently.

PMing you