Soarer Central: Archive through January 14, 2010

Soarer Central Mechanical - TT General Mechanical Cold start problem, help please Archive through January 14, 2010

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Scott Wilkes
Goo Roo
Tasmania
92 TT Factory Manual, 70 HG GTS Monaro

Posts: 1160
Reg: 10-2008

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Friday, January 08, 2010 - 04:02 pm, by: Scott Wilkes (Scottywilkes)

ok, so ever since ive had the soarer, at cold start it would idle up to 1800rpm and then slowly drop down to the normal 6 to 800 revs once warm.

Problem started probably 6 months ago, sometimes it would work correctly, and sometimes it would just begin to idle at 800revs.

I thought it may be the idle speed motor playing up so removed it, cleaned it and the little 1 way rubber valve and reinstalled, but same problem.

Just recently i did the timing belt/pump etc and while i was making an order i bought a new Coolant temp sensor. While this improved fuel consumption a bit, the idle problem is still here.

Just now i replaced the idle speed motor with a friends one and didnt improve the problem either.

Anyone else have any ideas? As im kinda stuck at the moment.

James Wilson
Tinkerer
sa
TT

Posts: 86
Reg: 10-2008

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Friday, January 08, 2010 - 04:08 pm, by: James Wilson (Ser493)

Is the cold start also tied in with a sensor in the cat converter? I know some mazda's are and and aftermarket cat converters can upset the system?? Just a thought

Boris Siljanoski
TryHard
Western Australia
Soarer GZ20 TT

Posts: 121
Reg: 11-2007

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Friday, January 08, 2010 - 04:26 pm, by: Boris Siljanoski (Z2tt)

Maybe problem with the ECU, Try another ECU?

Scott Wilkes
Goo Roo
Tasmania
92 TT Factory Manual, 70 HG GTS Monaro

Posts: 1161
Reg: 10-2008

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Friday, January 08, 2010 - 04:26 pm, by: Scott Wilkes (Scottywilkes)

i dont think so mate, the cat sensor is just a temp sensor from my understanding.

Ive also removed the emanage ultimate out of the equation but no difference.

Scott Wilkes
Goo Roo
Tasmania
92 TT Factory Manual, 70 HG GTS Monaro

Posts: 1162
Reg: 10-2008

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Friday, January 08, 2010 - 04:29 pm, by: Scott Wilkes (Scottywilkes)

id like to try another ESC, but trying to find a manual ECU isnt fun haha. Especially being down in tassie

James Wilson
Tinkerer
sa
TT

Posts: 87
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Friday, January 08, 2010 - 04:57 pm, by: James Wilson (Ser493)

E-manage should not affect any cold start programs, I think ECU could also be a prime suspect, but I do think that the cold start program in toyota's might be a bit more complex than just a water temp sensor.

Scott Wilkes
Goo Roo
Tasmania
92 TT Factory Manual, 70 HG GTS Monaro

Posts: 1164
Reg: 10-2008

Rating: N/A
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Friday, January 08, 2010 - 05:04 pm, by: Scott Wilkes (Scottywilkes)

yeah i realise that, trying to find out what else to check haha.

The coolant temp sensor generally plays a large roll in most EFI cold start programs. So it was the first thing i checked and replaced.

Yeah i realise the emanage dosnt effect cold start as it still runs of factory ECU settings there, just trying to rule things out

From what i understand a auto ECU Will work with the manual setup correct? If so i might try and find 1 locally to try out, i have had the ECU out before to check the capacitors etc, and all seemed fine, looked brand new haha. But could be a resistor, transistor etc out of spec.

James Wilson
Tinkerer
sa
TT

Posts: 88
Reg: 10-2008

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Friday, January 08, 2010 - 10:01 pm, by: James Wilson (Ser493)

Try an auto ECU, Apparently it will run fine with an auto ECU until you get yours sorted. Have you taken the board out of your ECU before? If not just be super careful, there is a tape style loom thingy in there that is a bit fragile. Plus manual ECU's are like rocking horse poo, Very hard to find.. I asked my mate here in Adelaide who does remaps on most nissan's ect, and he said that is was very common on the early soarer 1jz for the resistors and capacitors to fail in the boards. If you like when you have your ECU out he could look at it for you? He has done crap loads of this type of work before. He is well known down here in Adelaide his business is called "speedlab" - He is a good bloke. He sorted a faulty ECU for me about eight months ago - car wouldnt turn over or do anything but it was a lot easier coz it was auto ECU.

Boris Siljanoski
TryHard
Western Australia
Soarer GZ20 TT

Posts: 124
Reg: 11-2007

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Saturday, January 09, 2010 - 08:56 am, by: Boris Siljanoski (Z2tt)

Will the Manual loom connectors line up with the plugs on the Auto ECU?

James Wilson
Tinkerer
sa
TT

Posts: 98
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Saturday, January 09, 2010 - 09:08 am, by: James Wilson (Ser493)

no but they are not required apparently, my mate who does the ECU's down here in adelaide told me last night that this should work?? - but don't quote me on it - haha - he said it should run fine?? I've only ever had Auto so I'm no expert..

James Wilson
Tinkerer
sa
TT

Posts: 99
Reg: 10-2008

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Saturday, January 09, 2010 - 09:09 am, by: James Wilson (Ser493)

If you like Scott I can probably get you his number, It might be better if you talked to him direct, he is a guru with ECU's.

Scott Wilkes
Goo Roo
Tasmania
92 TT Factory Manual, 70 HG GTS Monaro

Posts: 1168
Reg: 10-2008

Rating: N/A
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Saturday, January 09, 2010 - 10:16 am, by: Scott Wilkes (Scottywilkes)

il just try a different ECU first mate, but ive had the ECU apart probably 6 months ago when i was installing the emanage ultimate and everything looked smicko. So dunno.

You dont know if a manual JZA70 supra ECU will work?

Cameron Laufer
DieHard
Queensland

Built 1.5j 425.8rwkw & LPG 1jzgte 204rwks @ 10psi

Posts: 870
Reg: 12-2007

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Saturday, January 09, 2010 - 10:24 am, by: Cameron Laufer (Ivboost)

I have a manual 1jzgte soarer ecu for sale pm me if needed

Scott Wilkes
Goo Roo
Tasmania
92 TT Factory Manual, 70 HG GTS Monaro

Posts: 1172
Reg: 10-2008

Rating: N/A
Votes: 0 (Vote!)

Sunday, January 10, 2010 - 02:52 pm, by: Scott Wilkes (Scottywilkes)

id prefer not to buy 1 just on a hunch mate, as it may not be the problem.

So anyone else have any ideas other than ECU? Not sure what else to check. Cheers

Ilia Raykhtin
Tinkerer
Victoria
JZZ30 TT

Posts: 83
Reg: 11-2005

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Thursday, January 14, 2010 - 03:58 pm, by: Ilia Raykhtin (Greasemonkey)

i had the same symptoms, fuel pump ECU fixed it. try the fuel pump ecu bypass, i just ran two wires to the pins with a switch, then when it played up i clicked the switch and rpm went to normal, replaced, haven't had the problem since.

Aka Abedin
Goo Roo
NSW
91 G-TT, 93 GTL 31

Posts: 1261
Reg: 07-2005

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Thursday, January 14, 2010 - 04:18 pm, by: Aka Abedin (Soarer_91tt)

Ilia Raykhtin wrote on Thursday, January 14, 2010 - 03:58 pm:
i had the same symptoms, fuel pump ECU fixed it. try the fuel pump ecu bypass, i just ran two wires to the pins with a switch, then when it played up i clicked the switch and rpm went to normal, replaced, haven't had the problem since.

If you do decide to bypass the fuel pump ecu make sure you do not touch the wires/paper clip as it gets extremely hot after a few seconds. Use players.

How long does the car idle at 1800rpm?