| Author |
Message |
Dave Hart
TryHard
Not Australia
UZZ32
Posts: 109
Reg: 08-2005
|
As I mentioned in a previous thread my V8 will run all day but once hot and I stop the engine will just crank and crank and not catch. I must leave it 10 to 15 minutes to cool down before it will start. Replaced fuel ECU 10 months ago and had no trouble all winter and up to November when it started getting warm again. Today when it did it I tried the trick of bridging Fp & B but still didn't want to know. I can shorten the waiting time by cooling the engine compartment quicker by lifting the bonnet.
Is there any way of getting the fan to run whilst the engine is stopped by use of the paper clip method in the diagnostic box?
The temperature gauge never goes past the centre mark. |
Neil Griffiths
Trader
NSW
Super Charged UZZ31
Posts: 1059
Reg: 07-2005
|
A bloke in SA is having the same drama..
I have sent him anouther coolant temp sensor (didnt fix)
He has replaced AFM (didnt fix) Although he said it keeps coming up as a fault ??
Maybe,,Just maybe..the Air Temp Sensor is playing up ?? (Although this is part of the AFM) !!!
I have asked him to pour water onto the Ign Amplifiers (didnt fix)
Does it smell of fuel when it finally restarts ?? |
Dave Hart
TryHard
Not Australia
UZZ32
Posts: 110
Reg: 08-2005
|
Some things to consider Neil and there's no smell of fuel either.
I'll consider other suggestions if anyone has any. |
Emanuel Spinola
Moderator
NSW
JZZ30, UZZ32
Posts: 656
Reg: 07-2005
|
Have you guys sussed out the fuel pressure VSV for hot starting as in this doco?
|
Freeman Tang
TryHard
Vic
JZZ30 GT-TL
Posts: 149
Reg: 07-2005
|
have u changed your leads? broken leads will most likely to fail when hot. Just my experience. |
Peter Nitschke
Junk Filterer
South Australia
GT4.0 V8
Posts: 2748
Reg: 11-2004
|
What about the Idle Air Control Valve?
New article by Peter Scott http://www.planetsoarer.com/IAC/iac.htm |
Dave Hart
TryHard
Not Australia
UZZ32
Posts: 111
Reg: 08-2005
|
That VSV idea looks promising, thanks Manny. Will get that checked out first and if not then move on to Peter' one.
Keep them coming, thanks guys. |
Neil Griffiths
Trader
NSW
Super Charged UZZ31
Posts: 1065
Reg: 07-2005
|
The Soarer V8 does'nt use a VSV for the Fuel Reg..(It has direct Vaccum from the Plenum  ) |
Matthew Sharpe
TryHard
North Island
3.0 GT
Posts: 209
Reg: 10-2005
|
Hmm, if it was a SU Carb, I'd say it was vapour lock... but not with fuel injection... |
Dave Hart
TryHard
Not Australia
UZZ32
Posts: 112
Reg: 08-2005
|
Mmmm...well what is it then?
It certainly appears to be vapour lock type problem.
Could the heat alter the shifter in park position so inhibiting a start? |
Neil Griffiths
Trader
NSW
Super Charged UZZ31
Posts: 1066
Reg: 07-2005
|
Vapour locks are cured on EFI cars.. (Fuel pump is in or near the fuel tank.
Inhibitor switch stops any cranking.. |
Dave Hart
TryHard
Not Australia
UZZ32
Posts: 113
Reg: 08-2005
|
Neil, if the V8 doesn't use a VSV then why does Manny's PDF file have the heading 'UZ FE'?
Maybe the problems related to a lean fuel mix.
Also on my original entry I asked if it was possible to frig the radiator fan to run when the engine isn't running, or should it be running and isn't in my case? |
Emanuel Spinola
Moderator
NSW
JZZ30, UZZ32
Posts: 657
Reg: 07-2005
|
Dave
The 1UZ-FE Engine Diagnostic page I posted above was from a US spec SC400, not a UZZ3x JDM Soarer - this would account for the omission as Neil notes if JDM Soarers don't use this circuit. |
Peter Nitschke
Junk Filterer
South Australia
GT4.0 V8
Posts: 2753
Reg: 11-2004
|
Dave, the V8 radiator fan is driven by a hydraulic pump which is driven by the engine.
What's a "frig"? |
Dave Hart
TryHard
Not Australia
UZZ32
Posts: 115
Reg: 08-2005
|
fair enough Manny/Peter.
I refer to a frig as a means of getting something to work by devious means.
As the fan gets it's motive force from a running engine then there's no other way of getting it to run. |
Neil Griffiths
Trader
NSW
Super Charged UZZ31
Posts: 1072
Reg: 07-2005
|
The Hydro Fan CAN be run via the Diag Port..
But I see no reason to do so..
The problem you have is similar to problems ALL cars with Igniter modules (That are old) have..
Just for a shot..Remove the plastic cover from the Ign Igniters (Left strut tower top)
*Be CAREFULL these things get VERY hot* after running.
Take a bottle of water with you..When the car dont start again,,pour the water over the Igniters and try it..
From 94 on,,Toyota Ommited the covers !!! |
Dave Hart
TryHard
Not Australia
UZZ32
Posts: 116
Reg: 08-2005
|
The only reason I'd want to run the fan would be to shorten the time I need to wait before it's cool enough to restart.
I'll try water on the igniters next time (will need to remember to have a bottle handy).
Thanx Neil. |
Peter Nitschke
Junk Filterer
South Australia
GT4.0 V8
Posts: 2759
Reg: 11-2004
|
Neil, even if you jumper the hydro fan from the Diag port, what is going to power it if the engine isn't running?
Dave, you could stand there and keep flipping the fan over by hand
Just opening the bonnet would help cool it, they trap heat in very effectively. |
Neil Griffiths
Trader
NSW
Super Charged UZZ31
Posts: 1077
Reg: 07-2005
|
Ummmmmmmmmmmmmmmmmmmmmmmmmmmmmmm maybe the B+ pin !!!!!!!!!!!  |
Dave Hart
TryHard
Not Australia
UZZ32
Posts: 117
Reg: 08-2005
|
Yes I've resorted to opening the bonnet, seems to knock a few minutes off the waiting time.
Wondered if a timer would help to let the engine cool down as the TT sometimes have. |
Dave Hart
TryHard
Not Australia
UZZ32
Posts: 118
Reg: 08-2005
|
Neil, how much are those igniter units, just in case? |
Ed Fitzgerald
Tinkerer
limerick
soarer uzz32
Posts: 36
Reg: 07-2005
|
may be the crankshaft sensor. i had similar woes |
Dave Hart
TryHard
Not Australia
UZZ32
Posts: 132
Reg: 08-2005
|
Someone else mentioned the crankshaft sensor. Next time it happens I'll squirt the igniter unit and if it does the job then I'll change it. If it doesn't then I'll look at the crankshaft sensor.
BTW, how does the crankshaft sensor do it's job, and would it not stop the engine when it's over heated as well as prevent a hot start? |
Dave Hart
TryHard
Not Australia
UZZ32
Posts: 148
Reg: 08-2005
|
It wouldn't restart when hot today so I tried cooling down the igniter module with 'freeze' spray but still wouldn't start, had to wait the usual 10 minutes.
So back to square one.
Any more ideas anyone? |
Gianni Matrogiannis
Tinkerer
nsw
SC400 V8
Posts: 28
Reg: 08-2005
|
i had the exact same problem with my v8 it ended up being the computer, i put a microtech in and it fixed the problem. neil im also curious how will the fan run with the car off. i dont think it has an electric motor on it |
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