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Brent Stewart
Tinkerer
ACT
Soarer V8 UZZ31

Posts: 7
Reg: 05-2009

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Friday, July 31, 2009 - 07:11 pm, by:  Brent Stewart (Bsm2122) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

I am not too sure if this a transmission related issue but when i floor the car fully it goes alright until I hit about 4500 rpm and the car struggles. At about 6000rpm its just hitting the rev limiter and not changing gear for about 2 seconds. This is through all the gears but only on full throtle. I actually recorded my best 1-100 at about 3/4 throttle. From 1000-2000rpm and 4500-6000rpm the car is reving really rough.
Does anybody know what is wrong
Thanks
Matt Sartori
TryHard
Western Australia
Rx7

Posts: 256
Reg: 08-2008

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Friday, July 31, 2009 - 07:16 pm, by:  Matt Sartori (Klutch) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)


Brent Stewart wrote on Friday, July 31, 2009 - 07:11 pm:

Does anybody know what is wrong



Its a v8?
Andrew Duaso
TryHard
Victoria
V8

Posts: 190
Reg: 02-2009

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Friday, July 31, 2009 - 07:37 pm, by:  Andrew Duaso (Andrewd) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

is the AFM plugged in?

i've been running around for a few days now with it disconnected and occasionally at wot it dosent really like shifting! but based on my g testing it's 0.5sec 0-100km/h faster
Ben Kelly
DieHard
Wentworthville
v8

Posts: 624
Reg: 08-2005

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Friday, July 31, 2009 - 08:26 pm, by:  Ben Kelly (Ace) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

brent..try plugs,lead, coil packs and afm first. esp if gearbox isnt slipping and no error codes.
Miles Baker
Goo Roo
Vic
66 Mustang GT Convertible, 55 Chevy Bel Air, 69 Firebird 455, 69 Nova SS Clone

Posts: 1699
Reg: 08-2005

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Friday, July 31, 2009 - 09:22 pm, by:  Miles Baker (Milesb) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Sounds like a spark issue to me.
Jamie Richards
Tinkerer
St.john's
v8

Posts: 10
Reg: 06-2009

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Saturday, August 01, 2009 - 03:28 am, by:  Jamie Richards (Nwb40gt) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

you should clean your AFM & check spark plugs, my car did that once at 2500 to 4000 it would misfire clean the AFM & clean fuel injectors works better than ever now
Matthew Sharpe
Goo Roo
North Island
JZZ31

Posts: 4519
Reg: 10-2005

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Saturday, August 01, 2009 - 12:26 pm, by:  Matthew Sharpe (Madmatt) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Old and tired I'd guess. Compression test, plugs, caps, rotors, leads, coils, injectors, filters etc.
Daniel Clarke
Goo Roo
NSW
TT 2.5L 6 cylinder

Posts: 5281
Reg: 03-2006

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Saturday, August 01, 2009 - 10:04 pm, 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)

Does it feel like the gearbox is slipping ? Does the rpm match the expected road speeds ?
Adam Foster
DieHard
SA
uzz30

Posts: 525
Reg: 07-2005

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Sunday, August 02, 2009 - 08:25 am, by:  Adam Foster (Adam) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

i had similar to this. and this is what one of the guys suggested read this.

Roger Costello
Posted on Thursday, June 09, 2005 - 10:45 pm:

--------------------------------------------------------------------------------
Hi,
One possible cause is carbon build up in the combustion chamber. The 91 Lexus LS400's had problems with this to the extent some had the heads modified by Lexus dealers to lower compression. There is an effective cure that I have used successfully on 3 different 1UZFE's. This really works and no I do not work for Caltex.

Buy 2 bottles of Caltex Techron 5000. (not 1000!) it should cost about $11 a bottle, keep looking till you find a Caltex station that stocks it. Add both bottles to a near empty tank and fill up with BP Ultimate or Caltex PULP. Drive normally (expect some/lots of smoke on acceleration initially) until the tank is below 20 litres and then remove the battery leads or relevant fuses for about 10 min's then reconnect. After you have reset the clock take it for a brisk drive. You should have no pinging and a lot more power after the ECU retunes the engine. This is because you've removed the carbon deposits in the combustion chambers and all over the back of the valves along with properly cleaning the injectors. The difference is remarkable and readily apparent within 20 - 40 KM of adding the Techron 5000 to the tank. The ECU reset is to maximize the benefits on timing.

The first time I did this I was stunned as it seriously felt like a new engine. I have tried most of the different magic potions on the market and the cocktail in Techron 5000 seems the most effective. It was developed by Chevron in the US to meet Californian legislated requirements to remove inlet valve deposits. There has been a fair bit of independent scientific testing with many types of engines and it really does work. It is proprietary to Chevron/Caltex and not available from other Australian sources other than in Caltex Vortex at less than 10% of the concentration you get with 2 bottles in one tank. The reason for two bottles and a full tank is that the normal ratio is about 1 bottle to 40 liters. While this will clean most of the carbon 60 or seventy liters worth at that concentration will leave your engine absolutely pristine. I add a bottle every two or three tanks and it stays like new.

If you still have problems with pinging think about ignition leads next. After removing the covers over the leads on each rocker cover have a look under the bonnet at night in a dark spot. If you have a bit of a blue purple ignition lead light show going on (not uncommon) the resistance of the leads may be fine but the insulation is breaking down leading to slight crossfire/misfire problems. I favour the OEM leads purchased through a Toyota dealer for around $400. Many other good leads are available but the Toyota OEM's come with all the plastic bits brackets and spacers that get old and brittle. I hope this helps.

Regards

Roger

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