Jump to content
SAU Community

Recommended Posts

33 gtst - clutch and full exhaust (bellmouth)

Had issues for a while when I fill up tank with fuel and start the car it won't idle correctly and hunts (sometimes stalls)

This issue I was always a bit whatever about it. Hit the throttle and she settles ok.

Major concern is:

I have had a very intermittent issue where the exhaust will pop when I decelerate with no throttle and then touch the throttle it will pop no matter how many times I go on an off throttle. Sometimes it will get so bad it will pop whilst decelerating down revs without touching the throttle.

Through the revs doesn't miss a beat.

Did it with 2 different motors in it. (blew motor) Only things that remained on change of engine was afm, tps, coils and loom. (fuel pump of course)

Cas, plugs, fpr, injectors all changed.

I got consult to find O2 sensor sitting at .3 when cold then when at temp sits around .1-.2V. Had a spare sitting around so tried that and it just read 0.0-0.15V. So I Bought O2 sensor and found readings Fluctuated from .28-.80V. Which a mates car also did. Got better fuel consumption of course.

Car still popped intermittently.

Tested for vac leak and all good.

Tested tps voltage and all good.

Also I originally had exhaust studs snapped so gathered that would cause popping. Changed all studs and gasket. Still popped intermittently.

It was very intermittent so hard to diagnose but of course now I am in QLD on holidays it is doing it a lot more then normal.

I have found that when I'm low on fuel it doesn't pop at all no matter how much I cruise or thrash it. I pull into servo and put fuel in and I pull out to check if it pops and it does.

So I am thinking fuel pump but why or can u guys think of something else?

Sorry for massive read but wanted to give as much info as possible.

I also understand if u all are not in the mood to think as it is Easter and u may be drunk or hungover.

Link to comment
https://www.sau.com.au/forums/topic/397196-exhaust-popping-on-decel-bad/
Share on other sites

Also check tps setting.

Did u keep the charcoal canister or remove it? If u removed it wat did u do with the lines? I had a mate route his breather line to the inlet manifold and wondered why it was running rich on decel and accell

Stock bov not blocked.

Exhaust wrap isn't needed for flames lol. It's stock and people think its off tap cause it blows flames.

Charcoal canister lines were put on as they were but will gO over them in the morning.

Checked it couple times as that's what everyone thought it would be and didn't believe I checked it right. It is set at .43v and reads normal on consult when issue is happening.

I'm going to get stuck into it now and see how I go.

One way to check whether or not its the TPS is to turn the ignition off whilst on decel and see if it makes any difference. If everythings working as it should it shouldn't make any difference. Just make sure the motors hot first

Yea that's still the same with ignition off.

I have vented charcoal canister to Atmosphere and it hasn't popped and carried on today.

Will hook canister back up tonight and see if it pops (of it does) then i will undo it to see if it fixs it.

Also found fuel filler fitting loose which is why fuel leaked last DECA.

Just did manifold gasket as I had 8 snapped studs lol. All new genuine parts. Reused gasket to exhaust which was fine.

When it was popping I thought this was due to fix it for sure but didn't :(

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now


  • Similar Content

  • Latest Posts

    • Hi, is the HKS  Tower Bar still available ? negotiable ? 🤔
    • From there, it is really just test and assemble. Plug the adapter cables from the unit into the back of the screen, then the other side to the car harness. Don't forget all the other plugs too! Run the cables behind the unit and screw it back into place (4 screws) and you should now have 3 cables to run from the top screen to the android unit. I ran them along the DS of the other AV units in the gap between their backets and the console, and used some corrugated tubing on the sharp edges of the bracket so the wires were safe. Plug the centre console and lower screen in temporarily and turn the car to ACC, the AV should fire up as normal. Hold the back button for 3 sec and Android should appear on the top screen. You need to set the input to Aux for audio (more on that later). I put the unit under the AC duct in the centre console, with the wifi antenna on top of the AC duct near the shifter, the bluetooth antenna on the AC duct under the centre console The GPS unit on top of the DS to AC duct; they all seem to work OK there are are out of the way. Neat cable routing is a pain. For the drive recorder I mounted it near the rear view mirror and run the cable in the headlining, across the a pillar and then down the inside of the a pillar seal to the DS lower dash. From there it goes across and to one USB input for the unit. The second USB input is attached to the ECUtec OBD dongle and the 3rd goes to the USB bulkhead connected I added in the centre console. This is how the centre console looks "tidied" up Note I didn't install the provided speaker, didn't use the 2.5mm IPod in line or the piggyback loom for the Ipod or change any DIP switches; they seem to only be required if you need to use the Ipod input rather than the AUX input. That's it, install done, I'll follow up with a separate post on how the unit works, but in summary it retains all factory functions and inputs (so I still use my phone to the car for calls), reverse still works like factory etc.
    • Place the new daughterboard in the case and mount it using the 3 small black rivets provided, and reconnect the 3 factory ribbon cables to the new board Then, use the 3 piggyback cables from the daughterboard into the factory board on top (there are stand offs in the case to keep them apart. and remember to reconnect the antenna and rear cover fan wires. 1 screw to hold the motherboard in place. Before closing the case, make a hole in the sticker covering a hole in the case and run the cable for the android unit into the plug there. The video forgot this step, so did I, so will you probably. Then redo the 4 screws on back, 2 each top and bottom, 3 each side and put the 2 brackets back on.....all ready to go and not that tricky really.      
    • Onto the android unit. You need to remove the top screen because there is a daughterboard to put inside the case. Each side vent pops out from clips; start at the bottom and carefully remove upwards (use a trim remover tool to avoid breaking anything). Then the lower screen and controls come out, 4 screws, a couple of clips (including 3 flimsy ones at the top) and 3 plugs on the rear. Then the upper screen, 4 screws and a bunch of plugs and she is out. From there, remove the mounting brackets (2 screws each), 4 screws on the rear, 2 screws top and bottom and 3 screws holding in the small plates on each side. When you remove the back cover (tight fit), watch out for the power cable for the fan, I removed it so I could put the back aside. The mainboard is held in by 1 screw in the middle, 1 aerial at the top and 3 ribbon cables. If you've ever done any laptop stuff the ribbon cables are OK to work with, just pop up the retainer and they slide out. If you are not familiar just grab a 12 year old from an iphone factory, they will know how it works The case should now look like this:
    • Switching the console was tricky. First there were 6 screws to remove, and also the little adapter loom and its screws had to come out. Also don't forget to remove the 2 screws holding the central locking receiver. Then there are 4 clips on either side....these were very tight in this case and needed careful persuading with a long flat screw driver....some force required but not enough to break them...this was probably the fiddliest part of the whole job. In my case I needed both the wiring loom and the central locking receiver module to swap across to the new one. That was it for the console, so "assembly is the reverse of disassembly"
×
×
  • Create New...