This may be my final help post :D (hopefully)

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sirRhodes
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This may be my final help post :D (hopefully)

Post by sirRhodes » 20/08/15 20:25

Hi guys and gals.
My mr2 is so close I can almost taste the victory (i think) :th:

Right so after about 2 or 3000 rpm it revs up perfectly, its just still from idle that it just revs slowly and then once it warms up its even worse, it can still rev but it is much slower once it is warm, I am just free revving it whilst in neutral if that changes anything.

I have taken a few videos and the exhaust might as well be a flame thrower :laughing (it is a janspeed system by the way) could that mean it is over fueling?

Does anybody have any ideas on why it doesn't rev up from idle easily (unless that is a common problem) and then revs a bit more slowly once it is warm.

Thanks in advance.




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sirRhodes
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Re: This may be my final help post :D (hopefully)

Post by sirRhodes » 20/08/15 20:27

could it possibly be the crank sensor?


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Re: This may be my final help post :D (hopefully)

Post by sirRhodes » 20/08/15 20:41

https://www.youtube.com/watch?v=HsmFBLN7LUI
Here is a vid of it revving :)

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Re: This may be my final help post :D (hopefully)

Post by Torero » 20/08/15 21:17

Just a punt but it sounds like the timing may be too far advanced to me.
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sirRhodes
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Re: This may be my final help post :D (hopefully)

Post by sirRhodes » 20/08/15 21:27

Possibly, but basically I have it turned all the way to the drivers side and if I turn it to the passengers side at all it will then start running worse, so can the timing be adjusted by changing the rotor arm ever so slightly or can it only be adjusted by spinning the distributor assembly??
If it is only the distributor then I presume there is nothing more that can be done?

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Re: This may be my final help post :D (hopefully)

Post by jimi » 21/08/15 8:06

There is no crank sensor on a 4A-GE. Why not set the timing correctly following the correct Toyota procedure ? Page IG11 of the BGB download it from here if you don't already have it. http://www.mr2oc.co.uk/forums/199/105677.html
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Re: This may be my final help post :D (hopefully)

Post by sirRhodes » 21/08/15 12:43

oh
well my point is I don't think it can be altered any more? If the only alteration I can make is by turning the distributor assembly then it can't be moved any further as like I said before it is all the way to the drivers side so it cannot be moved further that way and if I even make a minuscule movement towards the passenger side it starts running worse.

Please correct me if I am wrong but to my knowledge the only adjustment that can be made is the the distributor assembly but then like I said its all the way over to one side and if I try to move it to the other it starts to run rough

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Re: This may be my final help post :D (hopefully)

Post by jimi » 21/08/15 14:32

Your missing the point, the ECU alters the timing dynamically, to do this is uses inputs from various sensors, TPS, IAT, MAP and signals from the distributor, it then uses preprogrammed "maps" to decide how to alter the fueling and timing. It's not like the old points type distributor where the full advance/retard could be achieved by turning the distributor.
For this system to work properly the timing must be set in static mode (ie the ECU is temporarily prevented from altering the timing) to do this you need to link out T and E1 on the check connector then set the timing using a strobe light to 10° BTDC at idle (by turning the distributor) before removing the link and checking that the timing (at idle) is now more than 16°BTDC.
All this is laid out by Toyota in the BGB which you can download via the link I posted ;)
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Re: This may be my final help post :D (hopefully)

Post by sirRhodes » 21/08/15 17:10

oooohhhh yeah ok I see
I'll try and get around to it soon enough, its started chucking it down so will probably need to be done tomorrow.

Cheers :)

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