Motor Hardly Runs, Stalls, Splutters, No Boost

[Robo's]

I have just re-assembled my gtst to standard, put everything standard back in, turbo, ecu, afm, fuel reg, fuel pump, and coils.

Fired it up and it started first pop like a baby, never idled so good in years. I was wrapped. I let it idle for 20 minutes as i checked for leaks, presto, all fixed.

Took it to the car wash to clean things up so i thought i might do the engine bay as well. I was pretty careful with everything around the pod filter etc.

Took it home and it now runs like a absolute cop, car wont idle without giving some sort of throttle and falls in a hole as you put the foot down, even a slight bit. Back into the garage to check for air leaks, maybe water down the valley. Took all the spark plugs out, all good. Took the afm off last night together with all the piping to the turbo etc, nothing, bolted it all back, and still wont idle without stalling.

I am thinking ECU or AFM are faulty?? Should i reset the ECU and check for fault codes???

Maybe it was just a concidence that when i cleaned the engine bay now it runs like a cop.

[paulr33]

reset stock ecu and run ecu diag

sounds like a major sensor is loose, unplugged, toast etc

[The Dan]

This happens every time someone cleans their engine bay. Run the car, find which cylinder it is missfiring on and look around that area. If it's multiple cylinders, just run the car gently around the block a few times. Chances are it'll clear up. If not, try cleaning the AFM and air blowing the back of the injector plugs.

[Dose Pipe Sutututu]

water on the ignitor, coil packs, TPS, AFM.. get an air gun blast its mum and leave the car in the sun for a day with the bonnet open, see how you go then.

[Robo's]

Will check TPS, ignitor and reset ecu to read codes tonight. AFM is clean, might pull the plug to see whether it makes a difference.

[Dose Pipe Sutututu]

if u pull the AFM plug, it will put the ECU into limp mode and dump heaps of fuel into the car and you'll be restricted with a rev limiter of around 4000rpm

[The Dan]

if u pull the AFM plug, it will put the ECU into limp mode and dump heaps of fuel into the car and you'll be restricted with a rev limiter of around 4000rpm

yes, and the car will run with a blown cooler pipe 90% of the time after you have done this

[Dose Pipe Sutututu]

yes, and the car will run with a blown cooler pipe 90% of the time after you have done this

great for when you get into a small stack resulting in FMIC damage and want to save on a tow truck!

[The Dan]

great for when you get into a small stack resulting in FMIC damage and want to save on a tow truck!

Well it was more so suggested because if he disconnects it and the car runs, then it's either a cooler pipe blown off or a faulty AFM. Narrows the search down somewhat and it's an easy check to do

[Robo's]

Ok, reset the ecu and nothing, still the same. Took the AFM connection off and its runs exactly the same, so basically the AFM is doing nothing and the ecu is in limp mode.

Does this mean its the AFM meaning maybe a slight bit of water got on the connection and has caused this??

Or is there something else putting it into limp mode. I have checked all cooler pipes and they are fine.

[Robo's]

Checked error codes and nothing is displayed, i got 55 which is not faults when i first checked it. After i re-set it, i get a stable engine light.

[Robo's]

Anyone else with ideas?

[The Dan]

Anyone else with ideas?

Have you replaced the AFM yet?

[Robo's]

Have you replaced the AFM yet?

No mate, might have to find one eventually but i thought i would do all the checks before i start replacing parts. Pulled the AFM apart and re soldered the joints, no difference

[The Dan]

No mate, might have to find one eventually but i thought i would do all the checks before i start replacing parts. Pulled the AFM apart and re soldered the joints, no difference

Then have you done a voltage output test on the AFM to diagnose it?

[Robo's]

Then have you done a voltage output test on the AFM to diagnose it?

No, what reading should the 4 connectors have?

[Robo's]

I took the AFM plug out and it runs exactly the same as when its in, so looks like it maybe the AFM.

[Robo's]

Found it, bloody fuel pump

[diamondjo]

Thanks for the update mate, I was interested to know how you went.