| Author |
Message |
Andrew Adebiyi
Tinkerer
NSW
V8 Limited
Posts: 14
Reg: 12-2007
|
Hey guys. Was just playing music for a couple of minutes with the engine off, then car wouldn't start. Thought this was just a flat battery so got nrma to come but he said it's not the battery. He has no idea what it is. When i turn the key it cranks but will not start. Not sure if this is related but today the fuel level suddenly dropped to 37L even though it is almost full. Drove for a while and went back to normal. Also I just had my rear bushes replaced and after that the rear light warning came on for a few hours then disappeared. Not sure if the problem could be a fuel sensor or something. Any help is appreciated. |
Andrew Adebiyi
Tinkerer
NSW
V8 Limited
Posts: 15
Reg: 12-2007
|
Forgot to mention that it usually cranks for 3-4 seconds before starting and for the first time I used 95 Ron instead of 98 yesterday. Fuel Pump, Battery, spark plugs, thermostat and water pump were all replaced a few weeks ago as well. |
Miles Baker
Goo Roo
Vic
66 Mustang GT Convertible, 55 Chevy Bel Air, 69 Firebird 455, 73 Corvette 4sp T-Tops
Posts: 1128
Reg: 08-2005
|
Fuel pump ECU is my bet. |
Peter Nitschke
Junk Filterer
South Australia
GT4.0 V8
Posts: 8793
Reg: 11-2004
|
Unrelated to the problem, but your fuel tank sensor also needs cleaning. See the tutorial. |
Andrew Adebiyi
Tinkerer
NSW
V8 Limited
Posts: 16
Reg: 12-2007
|
Ok it started like usual this morning (still cranked for a couple of seconds). |
Andrew Adebiyi
Tinkerer
NSW
V8 Limited
Posts: 17
Reg: 12-2007
|
Hey guys just called Niall Bond and he said it is definitely not the fuel ECU. He said with fuel ECU problems the car does start but then turns off by itself after a few seconds. Since my car cranks but does not turn over he thinks it would just be a small problem with the spark plug /leads or fuel filter. These have just been replaced so I doubt that's the problem. Do you guys know what the main causes of slow starting are considering I have enough fuel and the battery is fine? |
Dave Hart
Goo Roo
Waikato
UZZ32
Posts: 1225
Reg: 08-2005
|
When it does start will it run all day without trouble until you switch off and try to restart? |
Andrew Adebiyi
Tinkerer
NSW
V8 Limited
Posts: 18
Reg: 12-2007
|
Yes it runs beautifully. I started fine today, some days it cranks for 5 seconds some days it cranks for 2. And twice in the last three weeks it hasn't started. |
Antonio Hunt
Tinkerer
NSW
TT
Posts: 55
Reg: 11-2006
|
i had something similar to that, it took the mechanic on and off about 2 days to figure it out. he said something about the cold start switch. |
Dave Hart
Goo Roo
Waikato
UZZ32
Posts: 1229
Reg: 08-2005
|
My problem is similar. It will start from cold and run all day but when it gets too hot it won't restart until it's cooled down sufficiently. So it's worse in the summer and hardly ever in the winter.
I've been told it could be a cracked board in the AFM that when it gets hot opens up to break a signal path for a start permissive. Whether that's true or not I'm not sure as I don't have another AFM to try. |
Evan Kaio
Tinkerer
Wellington
'91 UZZ31
Posts: 58
Reg: 01-2007
|
Dave, I have a spare AFM that works.
I'm going to try your idea out this weekend.
Probably still buy a fuel ecu. |
Damian Ware
DieHard
Victoria
UZZ32
Posts: 639
Reg: 10-2005
|
Guys that certainly doesn't sound like an AFM fault.
It is common from ECU faults to be displayed as AFM error codes as the ECU cannot perform diagnostics on itself but it can determine that the AFM signal is not read correctly.
To check if the AFM is the problem, unplug it, the car will still run without it. Not as well as it would but better than it would with a broken AFM. |
Evan Kaio
Tinkerer
Wellington
'91 UZZ31
Posts: 59
Reg: 01-2007
|
Peter Nitschke wrote on Wednesday, February 06, 2008 - 04:54 am:Unrelated to the problem, but your fuel tank sensor also needs cleaning.
Blinky dash fix can solve this problem also. |
Don Bagnall
Moderator
New Zealand
I have WAY less Soarers than Hayden :-(
Posts: 6639
Reg: 05-2005
|
Possible faulty IGNITER. |
Evan Kaio
Tinkerer
Wellington
'91 UZZ31
Posts: 60
Reg: 01-2007
|
Damian Ware wrote on Thursday, February 07, 2008 - 05:23 pm:To check if the AFM is the problem, unplug it, the car will still run without it. Not as well as it would but better than it would with a broken AFM.
Cool, one less thing to do this weekend. |
Neil Griffiths
Goo Roo
NSW
I have a Cadillac  and a Supercharged Manual V8 
Posts: 4458
Reg: 07-2005
|
Engine ECU has leaky caps. |
Dave Hart
Goo Roo
Waikato
UZZ32
Posts: 1230
Reg: 08-2005
|
Someone said it was the crank angle sensor but the Lexus mechanic said it couldn't be that and mentioned the AFM.
ECU leaky caps Neil? Can you expand? |
Miles Baker
Goo Roo
Vic
66 Mustang GT Convertible, 55 Chevy Bel Air, 69 Firebird 455, 73 Corvette 4sp T-Tops
Posts: 1131
Reg: 08-2005
|
Just humour me and use a paper clip and see if the problem goes away.
Mine did EXACTLY that and it was paper clip time. |
Damian Ware
DieHard
Victoria
UZZ32
Posts: 640
Reg: 10-2005
|
David, this can also be caused by a faulty ECU as I have mentioned to above.
If this is the case I can repaired it for you but it is easy to disconnect the AFM, try diagnostics fuel pump ECU by pass ect as it could be something else.
ECU is most likely cause but unless you have a known good spare to test it with it is easier to rule out other things you can check as well. |
Andrew Adebiyi
Tinkerer
NSW
V8 Limited
Posts: 33
Reg: 12-2007
|
Sorry to bring this very old post up again but I am having the exact same problem as Dave.
When the engine is cool it starts and runs fine but after the engine has warmed up, occassionaly if I turn it off it will not start again (will crank over but idle will fall and cut out). If I leave it over night to cool then it starts and runs fine.
I am also receiving engine electrical system and brake system warnings on and off.
Also the temperature reading has been moving between the dead middle to one position hotter on and off lately.
Any help would be kindly appreciated |
Ben Kelly
TryHard
Wentworthville
v8
Posts: 384
Reg: 08-2005
|
just wanted to add this comment even though its a bit off topic but i was driving around with a faulty fuel ecu for 3 years as niall assured me this wasnt the problem...in the end it didnt start because da da dum, it was the fuel ecu. If they are well rooted, eventually they wont start. |
Andrew Adebiyi
Tinkerer
NSW
V8 Limited
Posts: 34
Reg: 12-2007
|
Hi guys, found the problem for starting problem.
The throttle body was very dirty and the securing clip for the cruise control was missing thus allowing the throttle flap to move and change the air intake to the motor resulting in the cutting out and problems starting |
Peter Nitschke
Junk Filterer
South Australia
UZZ30 UZZ31
Posts: 10063
Reg: 11-2004
|
Good work finding that. Any chance of a pic of where this clip is? |
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