hae does anyone know whats wrong with my bg

michael0008 · 19-09-2008, 06:17 PM

hae i have a 89 f .it idle fine when i start it ,but after 15mins or so of driving its idle starts to drop slowly to 500 rpm when at triffic lights and stays at 500 rpm when stopped

89sp1.8 · 19-09-2008, 08:22 PM

idle will be higher when first start car cause of automatic choke..then drops when gets to temperature..maybe ur idles adjust is set to low..when car is warm and idle drops..then adjust it to where sposed to be..(800-900ish)

to adjust there is a flast head screw on intake manifold..has little black cap covering it.

michael0008 · 20-09-2008, 11:16 AM

o cool i found it i will tell you if that fix it thanks

michael0008 · 22-09-2008, 05:56 PM

does tht just change the idle not the ecu or any thing else cose i just wht to change the idle

Cosmo Dude · 22-09-2008, 06:23 PM

Quote:

Originally Posted by 89sp1.8

to adjust there is a flast head screw on intake manifold..has little black cap covering it.

Won't work, the ECU maintains the idle with the IAC valve. If you adjust that screw the ECU will adjust the IAC.
First you have to tell the ECU that you want to make adjustments then adjust the screw on the throttle body.
Don't touch the screw on the VAF, that changes air/fuel.

70NYD · 23-09-2008, 12:16 AM

it depends on the ECU i guess it worked for my old camira that had a retarded ECU lol but i never tryied it on anyhting else just give it a go?

Putonyourshoes · 23-09-2008, 02:16 PM

it will work but it changes the air/fuel ratios, thats assuming it doesnt reset itself. you gotta connect 10 and gnd in the code thingy (mind blank)

Cosmo Dude · 24-09-2008, 06:11 PM

Maybe on the SOHC but everything I have on the BG DOHC agrees with me.

Oh shoes it's GND and TEN not 10 I'm not being pedantic.

Cosmo Dude · 24-09-2008, 06:52 PM

Quote:

Originally Posted by mussing

No really, you don't have to change anything except the idle screw. The ECU will automatically and instantaneously detect the larger volume of air coming in and increase the amount of fuel by itself, keeping the air/fuel ratio the same.

If your IAC is stuffed then you're right but Michael008s car has a working choke.

BTW auto or manual?

Mc_Nuggets · 25-09-2008, 06:03 AM

Doesn't the ECU learn when you ajust it?? Or ajust it and reset the ecu or something??

70NYD · 25-09-2008, 10:10 AM

adjusting the little screw is like puting your foot down on the accelerator pedal just a little bit cus essentially THATS what it does. i highly doubt that the ECU will adjust itself against pedal movement as that would end up with everyones engines loosing power overtime..
michael0008 just try it its not like ther is anything to loose

michael0008 · 25-09-2008, 04:37 PM

yea its a manual na i havnt do it yet

Cosmo Dude · 11-10-2008, 08:01 PM

If that worked then your Idle Air Control (IAC) valve is jammed.

Cosmo Dude · 11-10-2008, 08:11 PM

Actualy I'm not 100% correct.
If you pull the throttle on then the Throttle Position Sensor (TPS) won't tell the ECU that the engine should be at idle and the IAC won't be engaged.
If the IAC isn't.....
Meh... You aren't listning anyway.

michael0008 · 13-10-2008, 04:14 PM

yea i change the idle lol its in a stupid place for the screw

michael0008 · 13-10-2008, 04:15 PM

thanks for the help

19-09-2008, 06:17 PM	#1
michael0008 AstinaGT Regular Join Date: Sep 2008 Location: New Zealand Car: 1989 Astina GLX Posts: 288 View Photos By: michael0008	hae does anyone know whats wrong with my bg hae i have a 89 f .it idle fine when i start it ,but after 15mins or so of driving its idle starts to drop slowly to 500 rpm when at triffic lights and stays at 500 rpm when stopped Last edited by michael0008; 19-09-2008 at 06:48 PM.

22-09-2008, 05:56 PM	#4
michael0008 AstinaGT Regular Join Date: Sep 2008 Location: New Zealand Car: 1989 Astina GLX Posts: 288 View Photos By: michael0008	does tht just change the idle not the ecu or any thing else cose i just wht to change the idle __________________ crazy ant

23-09-2008, 12:16 AM	#6
70NYD Veni, vidi, vici Join Date: Mar 2008 Location: Brisbane Car: 1996 BA Hatch & 2005 RX8 Posts: 4,911 View Photos By: 70NYD	it depends on the ECU i guess it worked for my old camira that had a retarded ECU lol but i never tryied it on anyhting else just give it a go? __________________ Last edited by 70NYD; 25-09-2008 at 10:11 AM.

23-09-2008, 02:16 PM	#7
Putonyourshoes Senior Member Join Date: Aug 2007 Location: cronulla Car: 2L 96 BA hatch Posts: 1,131 View Photos By: Putonyourshoes	it will work but it changes the air/fuel ratios, thats assuming it doesnt reset itself. you gotta connect 10 and gnd in the code thingy (mind blank) __________________ http://www.astinagt.com/forums/vbpic...?do=view&g=433

24-09-2008, 06:11 PM	#8
Cosmo Dude コスモ Join Date: Dec 2002 Location: Location: Vic Car: Mazda '95 Astina I4, '86 B2K and '10 3 MZR-CD Posts: 7,888 View Photos By: Cosmo Dude	Maybe on the SOHC but everything I have on the BG DOHC agrees with me. Oh shoes it's GND and TEN not 10 I'm not being pedantic. __________________ My 'stina Hatch

19-09-2008, 08:22 PM	#2
89sp1.8 Senior Member Join Date: May 2005 Location: brisbane Car: bg astina Posts: 1,186	idle will be higher when first start car cause of automatic choke..then drops when gets to temperature..maybe ur idles adjust is set to low..when car is warm and idle drops..then adjust it to where sposed to be..(800-900ish) to adjust there is a flast head screw on intake manifold..has little black cap covering it.

20-09-2008, 11:16 AM	#3
michael0008 AstinaGT Regular Join Date: Sep 2008 Location: New Zealand Car: 1989 Astina GLX Posts: 288 View Photos By: michael0008	o cool i found it i will tell you if that fix it thanks

25-09-2008, 06:03 AM	#10
Mc_Nuggets Astina GT Junkie Join Date: Jan 2008 Location: \| Brisbane \| Car: SP20 Hatch 2001 Mica Black Posts: 370 View Photos By: Mc_Nuggets	Doesn't the ECU learn when you ajust it?? Or ajust it and reset the ecu or something?? __________________

25-09-2008, 10:10 AM	#11
70NYD Veni, vidi, vici Join Date: Mar 2008 Location: Brisbane Car: 1996 BA Hatch & 2005 RX8 Posts: 4,911 View Photos By: 70NYD	adjusting the little screw is like puting your foot down on the accelerator pedal just a little bit cus essentially THATS what it does. i highly doubt that the ECU will adjust itself against pedal movement as that would end up with everyones engines loosing power overtime.. michael0008 just try it its not like ther is anything to loose __________________

25-09-2008, 04:37 PM	#12
michael0008 AstinaGT Regular Join Date: Sep 2008 Location: New Zealand Car: 1989 Astina GLX Posts: 288 View Photos By: michael0008	yea its a manual na i havnt do it yet __________________ crazy ant

11-10-2008, 08:01 PM	#13
Cosmo Dude コスモ Join Date: Dec 2002 Location: Location: Vic Car: Mazda '95 Astina I4, '86 B2K and '10 3 MZR-CD Posts: 7,888 View Photos By: Cosmo Dude	If that worked then your Idle Air Control (IAC) valve is jammed. __________________ My 'stina Hatch

11-10-2008, 08:11 PM	#14
Cosmo Dude コスモ Join Date: Dec 2002 Location: Location: Vic Car: Mazda '95 Astina I4, '86 B2K and '10 3 MZR-CD Posts: 7,888 View Photos By: Cosmo Dude	Actualy I'm not 100% correct. If you pull the throttle on then the Throttle Position Sensor (TPS) won't tell the ECU that the engine should be at idle and the IAC won't be engaged. If the IAC isn't..... Meh... You aren't listning anyway. __________________ My 'stina Hatch

13-10-2008, 04:14 PM	#15
michael0008 AstinaGT Regular Join Date: Sep 2008 Location: New Zealand Car: 1989 Astina GLX Posts: 288 View Photos By: michael0008	yea i change the idle lol its in a stupid place for the screw __________________ crazy ant

13-10-2008, 04:15 PM	#16
michael0008 AstinaGT Regular Join Date: Sep 2008 Location: New Zealand Car: 1989 Astina GLX Posts: 288 View Photos By: michael0008	thanks for the help __________________ crazy ant