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  Soarer Central * Mechanical - V8 * Sc400 Rev cut a 3750 RPM HELP URGENT Previous Previous    Next Next  

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Jason Storey
Newbie
QLD
Soarer V8

Posts: 1
Reg: 10-2006

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Sunday, October 15, 2006 - 06:24 pm, by:  Jason Storey (Buttocks) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Heres the problem
I own a sc400 1991 model imported for Japan to Australia
When i picked it up it was hitting a rev limiter at 3750
Now the car is absolutely stock
i've taken it to the local toyota dealer who have fault check the car with the australia 1uz diagnostic tool (only shows about half of what it should as nobody here has a proper *** one) they found nothing
We have changed over these parts
ECU
Fuel Computer
igniters
AFM

Its a real horrible problem that no-one here can answer and its driving me mad, its 100 percent like the rev limited that should be around 7000rpm
i've been told to check the fuel pump now, but if the fuel pump wasn't supplying enough pressure it would hestitate but the car drives perfect except for the rev cut.
I also found today if i get to 90 kph and knock it back into 2nd it will go above 4000 but cuts out until the revs go below 3750 again and off it goes as normal, but a fault code comes up in Japanese which i translated to engine electrical system (kind of a broad statement)
Any help would be life saving

I"VE ALSO HAD A THOUGHT< WOULD A FCD (fuel cut defencer) stop the rev cut from coming in????
Jason Storey
Newbie
QLD
Soarer V8

Posts: 2
Reg: 10-2006

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Monday, October 16, 2006 - 12:25 am, by:  Jason Storey (Buttocks) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Forgot to say the car runs absolutely without fault its smooth powerful gets good fuel consumption, it just won't rev past 3750rpm
Andrew Ferres
TryHard
WA
'86 Cressida V8, '84 Soarer V8, '90 C-F Celsior V8

Posts: 428
Reg: 07-2005

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Monday, October 16, 2006 - 04:24 pm, by:  Andrew Ferres (Peewee) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Have you swapped ECU's with someone else?
Andrew Ferres
TryHard
WA
'86 Cressida V8, '84 Soarer V8, '90 C-F Celsior V8

Posts: 429
Reg: 07-2005

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Monday, October 16, 2006 - 04:25 pm, by:  Andrew Ferres (Peewee) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Whoops, just read you have.


Try swapping a TPS with someone.
Both the main and TRC one.
Don Bagnall
Moderator
New Zealand
I have WAY less Soarers than Hayden :-(

Posts: 4849
Reg: 05-2005

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Monday, October 16, 2006 - 06:54 pm, by:  Don Bagnall (Baggs) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

OR........Do what Neil suggests
Andrew Ferres
TryHard
WA
'86 Cressida V8, '84 Soarer V8, '90 C-F Celsior V8

Posts: 430
Reg: 07-2005

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Tuesday, October 17, 2006 - 09:07 am, by:  Andrew Ferres (Peewee) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

In my exp if the cam belt is out one tooth the ecu will throw a code.
Jason Storey
Newbie
QLD
Soarer V8

Posts: 3
Reg: 10-2006

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Friday, October 20, 2006 - 06:33 pm, by:  Jason Storey (Buttocks) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Still can
t find anything wrong with this thing, its wierd.
Can anyone suggest someone to call about it in Qld?
As its driving me batty
Harry Lemmens
TryHard
Victoria
V8

Posts: 229
Reg: 11-2004

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Tuesday, October 24, 2006 - 10:00 am, by:  Harry Lemmens (Wombat) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

cats are blocked (melted down matrix).

The exhaust gas is not getting out.

Almost bet you can hear hissing from the exhuast system.

Often happens when one of the V8 coils fail
Jason Storey
Newbie
QLD
Soarer V8

Posts: 4
Reg: 10-2006

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Tuesday, October 24, 2006 - 10:57 pm, by:  Jason Storey (Buttocks) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

So if the cats are screwed (which are new) how do you explain the car running perfect and not hestitating etc
Peter Nitschke
Junk Filterer
South Australia
GT4.0 V8

Posts: 6188
Reg: 11-2004

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Wednesday, October 25, 2006 - 01:01 am, by:  Peter Nitschke (Pen) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Jason, "blocked" doesn't have to mean completely blocked. If they are partially blocked, things would be OK up to a point - which could fit the problem's job description.
Jason Storey
Newbie
QLD
Soarer V8

Posts: 5
Reg: 10-2006

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Thursday, October 26, 2006 - 01:00 pm, by:  Jason Storey (Buttocks) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

But why would the computer go into a rev limited because of the cats? Wouldn't it be showing other things, like bad perfromance etc
Harry Lemmens
TryHard
Victoria
V8

Posts: 232
Reg: 11-2004

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Thursday, October 26, 2006 - 01:38 pm, by:  Harry Lemmens (Wombat) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Okay ... Not so much as a rev limit as the engine cannot breath the gas out.

This problem has been seen before ... Its not the ECU going into rev limit!

Easiest test is to drop the exhaust at the engine end of the cats. Start it up and see if it EASILY revs past your current limit.

You havent said your getting "engine electrical" up on the dash ... assume you are not ...

An FCD will not help ... FCD's are installed on the (turbo) TT2.5's to prevent the fuel cut when "excessive" boost is detected.

The fuel pump ECU may well be cactus ... They do not fail totally, but they drop back to the low power/fuel setting, and will not deliver full output.(Or, 9 volts (or less) if you put a multimeter across the output.) NB: After the car is warm, at idle the ECU will drop to this voltage ... Only at High engine loads will it attempt to step up to the higher output power setting (12 volts or more.)
To sus this out, put in the diagnostic bypass jumper, which effectively bypasses the fuel pump ECU, and delivers battery straight to the fuel pump. (There should be heaps of posts on this, just do a search)

... Bad performance? You mean you dont consider 3750 RPM as being a sign of bad performance?

RE: Diags. You dont need a diagnostic tester for the Soarer OBD system. Most of the diags can be read from the "clock" on the dash. Or, you can read them from the EMV if your vehicle has one. Or, count the flashing lights.

There are several doc's on this forum that detail diags. I know, I compiled them! RTFM
Jason Storey
Tinkerer
QLD
Soarer V8

Posts: 6
Reg: 10-2006

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Thursday, October 26, 2006 - 10:43 pm, by:  Jason Storey (Buttocks) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Bad performance has nothing to do with a 3800rpm cut, as in the car is perfect upto that point, has good power etc.
Fuel pump computer has been changed and the fuel pump is working perfectly as its been checked 3 times now, it switch's between 9 volt and 12 volt like it should.
Its has only had engine electrical up on the dash when i've hit 90 kph in 3rd and drop it back into second which makes it go over the 3800rpm barrier, but it doesn't go anywhere until its back under the 3800rpm limit again
Daniel Clarke
DieHard
NSW
TT 2.5L 6 cylinder

Posts: 755
Reg: 03-2006

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Friday, October 27, 2006 - 07:21 am, by:  Daniel Clarke (Dieseltrain) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Tried swapping in another Air Flow Meter?
Jason Storey
Tinkerer
QLD
Soarer V8

Posts: 7
Reg: 10-2006

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Friday, October 27, 2006 - 07:28 am, by:  Jason Storey (Buttocks) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Yes we have tried a new AFM
Harry Lemmens
TryHard
Victoria
V8

Posts: 233
Reg: 11-2004

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Friday, October 27, 2006 - 09:45 am, by:  Harry Lemmens (Wombat) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Okay ... It sounds like your might be getting twice as many pulses being feed back from the ignition coil as there should be ... Easy to check with an oscilloscope ... Both coils have the feedback tap, so a quick swap might help. (Also, check for arcing on the coils)

Feedback should only come from one coil. Make sure that each coil has a seperate power feed. (Someone may have joined the two together in the past ... especially if an aftermarket ECU was tried . Many aftermarket ECU's only provide for one coil - wasted spark configuration.)

(Thinking about the above, I am not sure that joining the two power feeds together would let the car run at all ...)

...

H'mm ... I am at work, and don't have access to the wiring diagrams I need ... But ... the RPM signal goes to the dash as well...(I think) ... Wondering
if its actually not getting the RPM to the Engine ECU? Never tried to see what happens to a stock ECU if the RPM signal ISN'T connected. ECU could be in a "Limp Home" mode. Not all "Limp Home" modes bring up "Eng Elec".

anyway ... keep looking.
Kim Hunt
TryHard
NSW
Supercharged & Intercooled SC400\Soarer GT-L UZZ31

Posts: 191
Reg: 08-2007

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Wednesday, November 17, 2010 - 02:41 pm, by:  Kim Hunt (Lxtasi) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

are you sure the engine doesn't rev past 3750RPM? Because maybe its your dash lights that might be blown past 3750RPM. Swap out the dash and check
Jeff Bedsor
DieHard
QLD
TT

Posts: 996
Reg: 10-2006

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Wednesday, November 17, 2010 - 02:51 pm, by:  Jeff Bedsor (Jeff_bedsor) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

He's probably in an old peoples home by now, that was four years ago.
Kim Hunt
TryHard
NSW
Supercharged & Intercooled SC400\Soarer GT-L UZZ31

Posts: 192
Reg: 08-2007

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Friday, November 19, 2010 - 07:32 pm, by:  Kim Hunt (Lxtasi) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

i only noticed that after i had send the post. thanx :-)

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