Have an issue and a question regarding installing a High Flow TB.

Question: My stock TB has about 1mm of play in the throttle linkage. ie. When the throttle is opened the linkage moves about 1 mm before the butterfly starts to open. Now with the High Flow TB, the amount of play is 3mm possibly 4mm. Is this a problem as this seems a big difference?

Issue: The Idle Speed Control motor has a O ring that seals it to the TB. The O ring has expanded after I took it out of the old TB and now I can't get it to sit in the High Flow TB as it is too big. Is there anyway I can get this to work without buying a new O Ring. If the new O ring is the option, not sure how I can get one on a Sunday. I need the car for work tomorrow.

Any assistance would be much appreciated.

Cheers.

Have an issue and a question regarding installing a High Flow TB.

Question: My stock TB has about 1mm of play in the throttle linkage. ie. When the throttle is opened the linkage moves about 1 mm before the butterfly starts to open. Now with the High Flow TB, the amount of play is 3mm possibly 4mm. Is this a problem as this seems a big difference?

Issue: The Idle Speed Control motor has a O ring that seals it to the TB. The O ring has expanded after I took it out of the old TB and now I can't get it to sit in the High Flow TB as it is too big. Is there anyway I can get this to work without buying a new O Ring. If the new O ring is the option, not sure how I can get one on a Sunday. I need the car for work tomorrow.

Any assistance would be much appreciated.

Cheers.

Hmmm, perhaps just worn...

U need to get one from Mitsu, special item of course... That's the rectangular shape seal isn't it?
If u really have no choice, try Bodgy Brothers special and use a bit of silicon sealant there, heat resistant car type stuff, that is. Perhaps cut off that portruding bit of the seal and fill with dap of black silicon. It's subject to coolant pressure, so repair needs to be good to last cuppla days.

Play in the throttle linkage is no problem if it is in the cable or on the outside, but if the play is the butterfly shaft then I'd worry. Try to work out where the play is. If in doubt reinstall the original TB.

O rings swell up if in contact with coolant or fuel. Dry it out, put it in the sun or give it 5 sec in the microwave, or put in wall oven for a while. You'd be surprised how much they shrink. If it gets too small, soak in petrol for a while. Seals and O rings in automotive spray guns do the same thing - acrylic solvent makes them swell, take them out and you go WTF when you try to reassemble lol

Hmmm, perhaps just worn...

U need to get one from Mitsu, special item of course... That's the rectangular shape seal isn't it?
If u really have no choice, try Bodgy Brothers special and use a bit of silicon sealant there, heat resistant car type stuff, that is. Perhaps cut off that portruding bit of the seal and fill with dap of black silicon. It's subject to coolant pressure, so repair needs to be good to last cuppla days.

Thanks. The ISC motor seal in an "O" ring.

Play in the throttle linkage is no problem if it is in the cable or on the outside, but if the play is the butterfly shaft then I'd worry. Try to work out where the play is. If in doubt reinstall the original TB.

O rings swell up if in contact with coolant or fuel. Dry it out, put it in the sun or give it 5 sec in the microwave, or put in wall oven for a while. You'd be surprised how much they shrink. If it gets too small, soak in petrol for a while. Seals and O rings in automotive spray guns do the same thing - acrylic solvent makes them swell, take them out and you go WTF when you try to reassemble lol

Thanks MM. The play in not in the butterfly shaft so I expect it to be normal. Just that the amount is so different between the two. I guess it can be adjusted after installation if required.

Will keep working on the "O" ring, but heating seems to be making it bigger?? What am I doing wrong??

cut the o'ring down and glue it together with superglue... lil trade secret

most things (except water) expand in heat and contract in cold. If you're game, try putting it in the fridge for a minute or two and see if it shrinks.

Sounds like your O ring needs to be 'dehydrated'........haha sorry about that

i had the same prob with o ring, i just kept at it until it popped back into place, it took about 10 mins of stuffing around but it worked

Sounds like your O ring needs to be 'dehydrated'........haha sorry about that

lol lol lol

Well I found a replacement "O" ring for the ISC motor seal but it was alot thicker than the original. Not sure if it will seal properly. Will get proper "o" ring from Mitsi tomorrow.

I have installed the new TB and the motor is running. The idle is extremely high though- about 1700rpm, however, when the thermo fan kicks in, the idle drops to 900. When the fan turns off, the idle goes back up to 1700rpm.

Any idea what is happening now? Have not had much luck with this routine install!!

Did you disconnect the battery when doing the TB?

Did the new TB come with its own TPS? If so, does it need adjustment? If you moved yours across it will definitely need adjusting. If the ECU thinks you have your foot on the throttle it will not adjust the ISC motor.

Is the ISC motor plugged in properly? Sounds like it is not moving - is the "new" O ring jamming it? Try it without the O ring, possibly. Or check it out of the throttle body with it plugged in - should jiggle about when you turn the ignition on/off.


Might just be the need for the ECU to relearn how to control the ISC motor for a steady idle.

Check that the air flow meter plug hasnt been disturbed - I assume you took all that off when you swapped the TB, did you plug it back in?

Maybe your car is possessed by a Demon - can I buy it off you cheaply? lolz :nuts:

I need a :beer:

Failing all that, your 9 year old ISC motor may have died on you. Let us know how you go.

Did you disconnect the battery when doing the TB? No

Did the new TB come with its own TPS? Yes If so, does it need adjustment? If you moved yours across it will definitely need adjusting. If the ECU thinks you have your foot on the throttle it will not adjust the ISC motor.

Is the ISC motor plugged in properly? I think so. Sounds like it is not moving - is the "new" O ring jamming it? Not sure, maybe. Try it without the O ring, possibly. Or check it out of the throttle body with it plugged in - should jiggle about when you turn the ignition on/off.


Might just be the need for the ECU to relearn how to control the ISC motor for a steady idle. Will give it a go.

Check that the air flow meter plug hasnt been disturbed - I assume you took all that off when you swapped the TB, did you plug it back in? Yes and plugged in.

Maybe your car is possessed by a Demon - can I buy it off you cheaply? lolz :nuts:

I need a :beer:

Thanks for the info MadMax.

PM sent.

In summary:

1) With a 10mm ring spanner, slacken the 2x bolts on top of the throttle cable support and tap it away from the TB to take up slack. Don't go nuts here. Do it when the car is COLD.

2) Slice the oring with a stanly blade, take out tiny sections until it drops in. Bugger all air will ever pass thru here, maybe even less. Without an oring idle hasn't increased on tested TBs.

3) Check idle control screw is fully wound IN. I unwind them for their final clean and sometimes I'm too busy patting myself on the back to remember to screw it back in. Oops.

Other Qs:

TPS is not touched on exchanged TBs, unnecessary work with no purpose. If the paint on the TPS/nuts is broken I will put the test harness on and recallibrate them. Customers retain their own ISC that way the customer knows the condition of the ISC and eliminates it if problems arise - such as a high idle. If the idle was lumpy there would be an air leak (ecu not 'seeing' the air and not adding fuel), since the idle is raised I'd near bet money on the idle control screw being unwound.

If you suspect the ISC (which I don't think is faulty - normally idle falls with a dead ISC) I have 6+ you can take your pick from.

PM sent.

In summary:

1) With a 10mm ring spanner, slacken the 2x bolts on top of the throttle cable support and tap it away from the TB to take up slack. Don't go nuts here. Do it when the car is COLD.

2) Slice the oring with a stanly blade, take out tiny sections until it drops in. Bugger all air will ever pass thru here, maybe even less. Without an oring idle hasn't increased on tested TBs.

3) Check idle control screw is fully wound IN. I unwind them for their final clean and sometimes I'm too busy patting myself on the back to remember to screw it back in. Oops.

Other Qs:

TPS is not touched on exchanged TBs, unnecessary work with no purpose. If the paint on the TPS/nuts is broken I will put the test harness on and recallibrate them. Customers retain their own ISC that way the customer knows the condition of the ISC and eliminates it if problems arise - such as a high idle. If the idle was lumpy there would be an air leak (ecu not 'seeing' the air and not adding fuel), since the idle is raised I'd near bet money on the idle control screw being unwound.

If you suspect the ISC (which I don't think is faulty - normally idle falls with a dead ISC) I have 6+ you can take your pick from.

Thanks Ian and I have replyed to your PM. All good info and makes sense.

I would just like to say that I am really impressed with the improvements this mod has made and throttle response is improved immensely. I can highly recommend to anyone contemplating this to do it. The instructions that EZYBOY has are spot on and only takes an hour or so to complete.

Thanks again to EZYBOY for your great product and your "after sales service".

Thanks for letting me know how you go on with the idle. For those wondering too, it's now sitting steady on 850.

Thanks for letting me know how you go on with the idle. For those wondering too, it's now sitting steady on 850.

No worries. Idle is spot on now after the final adjustments. Could not be happier. Thanks again.