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loki boyracer
Regular


Location:
Carlingford NSW
Registered:
October 2004
icon8.gif  Inherited dodgy conversion Wed, 22 December 2004 00:11 Go to next message
I've owned my AE86 for a couple of months now and am just realising how dodgy the conversion (4AC to 4AGE) is. Wondering if it was at all possible to meet up with some one that has done one of themselves so he/she could look over mine too. Some problems include:
* Not holding idle- slowly raising to 1500rpm then quickly dropping back to 1000rpm
* 4AC fuel lines not changed
* Timing all over the shop
* Not sure if TVIS is kicking
* Alot of vacuum lines not connected to anything
I will be in the Blue Mountains over the Christmas break, any help would be much appreciated.

[Updated on: Wed, 22 December 2004 00:12]

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white86
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Location:
Brisbane
Registered:
May 2004
Re: Inherited dodgy conversion Wed, 22 December 2004 00:25 Go to previous messageGo to next message
Hi,

The idle thing (jumping from 1500 to 1000 and back all the time) is most likely your throttle position sensor. A bit of sideways play that develops from wear in the throttle body guts the tps and causes your erratic idle. To check for the wear, open the throttle 10 degrees and move the butterfly side to side. You could replace the tps, but the problem will return soon enough. I suggest replacing the whole throttle body.

Cheers, Daniel
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DEA-L3R
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Location:
bankstown syd
Registered:
December 2004
Re: Inherited dodgy conversion Wed, 22 December 2004 00:35 Go to previous messageGo to next message
my mate had same problem just get all vacuum pipes connected and u should put a vl commodore fuel pump try that by the way who put the motor in for you
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IRA11Y
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Location:
sydney
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May 2002
   
Re: Inherited dodgy conversion Wed, 22 December 2004 01:10 Go to previous messageGo to next message
DEA-L3R . are you really that stoopid? if you dont know what your talking about then just say nothing.. its clear you dont have a grasp on the questions at all.
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DEA-L3R
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Location:
bankstown syd
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December 2004
icon9.gif  Re: Inherited dodgy conversion Wed, 22 December 2004 01:56 Go to previous messageGo to next message
sory i got confused with the question
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IRA11Y
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May 2002
   
Re: Inherited dodgy conversion Wed, 22 December 2004 03:33 Go to previous messageGo to next message
Quote:

* Not holding idle- slowly raising to 1500rpm then quickly dropping back to 1000rpm


most likely you have a vacume leak somewhere or a blocked cold start solenoid

Quote:

* 4AC fuel lines not changed


you dont need to change the lines, the 4AC ones will be fine as long as the rubber sectoins have been converted to EFI hose with the approriate clamps

Quote:

* Not sure if TVIS is kicking


check the solenoid is wired up and the vacume lines are connected to the vacume tank

Quote:

* Alot of vacuum lines not connected to anything


yeah well theres your idle problem
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loki boyracer
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Location:
Carlingford NSW
Registered:
October 2004
Re: Inherited dodgy conversion Wed, 22 December 2004 22:42 Go to previous messageGo to next message
Yeah, I gathered as much, so my next question would be does anyone have a vacuum diagram to suit an early 4AGE in RWD guise?
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THE WITZL
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Toymods Social Secretary

Location:
Sydney
Registered:
July 2002
 
Re: Inherited dodgy conversion Wed, 22 December 2004 23:31 Go to previous messageGo to next message
http://www.toymods.org.au

--> Tech Docs
--> 4A-GE Book

all of your answers are there. Vacuum diagrams, EFI diagnosis, TPS adjustment/testing/setting, EFI fault flowcharts...... EVERYTHING!!!
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skit
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Location:
central coast NSW
Registered:
November 2004
Re: Inherited dodgy conversion Thu, 23 December 2004 00:31 Go to previous messageGo to next message
White86 -

When you speak of throttle body wear - it sounds like you mean play in the butterfly shaft, rather than the body itself? Not sure about car T/B's, but from rebuilding yamaha kart engines, typically the bore only wears out if the butterfly is installed backwards (kart ones have tapered edges to seal properly against the bore when throttle is closed), and the reversed taper edge wears away the bore. If this is what you mean, then I'd imagine you can get T/B rebuild kits which include butterly/ shaft/ spring/ bush? (but perhaps these are different between rwd & fwd throttle bodies? - I really don't know?)

Having said that, kart engines clock bugger all hrs compared to a daily driven car, so perhaps my comparison isn't valid anyhow -I suppose the shaft bores flog out eventually.


Loki Boy-

I am experiencing exactly same problems - it's like you are describing my car. Have you checked the igition timing by the way? Mine has an additional issue where it won't idle below an "indicated" 25 deg btd, and it runs rough all round. This is related to seperate issues though, not likely your car would do this aswell.

There are some truly disgraceful converter's around, you couldn't call them mechanics at all Shocked . I should have learned more about this motor before I bought a car - would have saved me alot of time & money if I had picked how shit the conversion was when I appraised the car..I would have left it well alone.

Good luck, if I get to the bottom of it before you i'll let you know.

scott

[Updated on: Thu, 23 December 2004 00:32]

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loki boyracer
Regular


Location:
Carlingford NSW
Registered:
October 2004
Re: Inherited dodgy conversion Wed, 29 December 2004 10:10 Go to previous messageGo to next message
Yeah, it all sounds familiar scott, if i set my dizzy to TDC and try to start it, it just wont!! Ahhh!
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Flem
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Location:
cambo
Registered:
May 2002
Re: Inherited dodgy conversion Wed, 29 December 2004 11:30 Go to previous message
i know another stupid answer but have you checked tightness of intake manifold? or try spraying wd40 ALONG gasket area if the idle changes u got a leak.
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