| Author |
Message |
Andrew Beutel
Tinkerer
Queensland
single turbo
Posts: 12
Reg: 02-2008
|
Well my 1jz soarer has been misfiring for about 4-5 months now it happens at idle and when accelerating.It seems like its overfueling a heap and the fuel economy is bloody shocking. I have tried nearly every fix possible tried 3 different sets of coilpacks including a brand new set, 3 sets of plugs, 4 different ecu's, 2 different tps modules, 3 map sensor's, 3 different igniters, replaced fuel filter and fuel pump so basically im exhausted most options. the weird thing is the engine runs alot better when i put nulon octane booster through it for some reason whether the vortex 98 just aint high enough octane for it anymore? Another thing im wondering is the cat converter is blocked up as it runs like a pig then you give it a rev just hitting the limiter it will let out a massive backfire then it will be good again for another 10- 15km. It frustrating as hell for me. Someone please help me out! |
Scott Wilkes
DieHard
Tasmania
92 TT Factory Manual
Posts: 921
Reg: 10-2008
|
sounds like a ECU issue, tried a new ECU? |
James Johnson
Goo Roo
Victoria
JZZ30 2JZ + Manual
Posts: 1224
Reg: 07-2005
|
is the map sensor unplugged/ vac hose fallen off??
does the car have even compression across all cylinders?? do a comp test
overheating? has it done a headgasget? check that cooing system isnt bubbling with rad cap off...
you have a single turbo i guess by your pfofile.. is it tuned properly?? has it been detonating?? has this stuffed it making it missfire.
ect..... |
James Johnson
Goo Roo
Victoria
JZZ30 2JZ + Manual
Posts: 1225
Reg: 07-2005
|
Andrew Beutel wrote on Wednesday, September 09, 2009 - 07:19 pm:4 different ecu's,
Andrew Beutel wrote on Wednesday, September 09, 2009 - 07:19 pm:sounds like a ECU issue, tried a new ECU?
read the post! |
Scott Wilkes
DieHard
Tasmania
92 TT Factory Manual
Posts: 922
Reg: 10-2008
|
so you just had to make another post to tell me that hey mate? Get over it, i made a mistake, which tends to happen when your up all night fearing it may be the last time you see a loved 1 alive. |
Scott Wilkes
DieHard
Tasmania
92 TT Factory Manual
Posts: 923
Reg: 10-2008
|
Check the fuel pressure mate, it may be the reg has failed cause excessive pressure in the fuel rail. But then, the ECU should recognize this and compensate.
Could also be a failed oxy sensor stuck reading lean all the time. |
Andrew Beutel
Tinkerer
Queensland
single turbo
Posts: 13
Reg: 02-2008
|
i have replaced o2 sensor recently as well, i have wondered about fuel reg as well havnt tried another 1 yet, as for being a single turbo yes its got a to4e turbo on it but i've still got the standard ecu, cams, injectors, havent got a safc or any form of piggyback/interceptor at all i havent got a fuel cut defender on it yet so i can only run 14-15psi max so i doubt that its running lean. As for overheating never had a problem with it all this time, i did have a compression test performed on it and it was all good across all cylinders. The car has had the turbo work done to it for almost 2 years ran really good except for the last 4-5 months |
Daniel Clarke
Goo Roo
NSW
TT 2.5L 6 cylinder
Posts: 5407
Reg: 03-2006
|
Fuel pump ecu ? Tried the bridge FP in diagnostics ? You say you replaced the fuel pump, but if the Fuel Pump Ecu is faulty, then every single Fuel pump will act the same way when the fuel pump ecu is playing up ...
I would try bridging the FP and see how it runs then champ . |
Dave Rose
DieHard
wa
uzz31 v8
Posts: 946
Reg: 03-2007
|
Andrew just a long shot try turning all the lights off in the garage (has to be pitch black)watch the engine for any tracking shows as a blue halo glow. |
Cameron Laufer
DieHard
Queensland
 Built 1.5j 425.8rwkw & LPG 1jzgte 204rwks @ 10psi
Posts: 827
Reg: 12-2007
|
Have you checked cam and crank angle sensors? does it miss under boost pressure? |
Chris Prak
DieHard
WA
JZZ30 Soarer - Twin Snails
Posts: 709
Reg: 12-2006
|
Is it just a misfire or a big jerk, like the motor has cut off momentarily for a split second?
I had the jerking just as it came onto boost, but after it was past that mark on the RPM, it was fine. Ended up having to drain the whole fuel tank and put a fresh load of BP Ultimate but it still lacked power and sometimes misfired/choked.
Now this may be irrelevant but reffering to Cameron's post, I was also getting the Cam Angle Sensor Error code on my dash, a few months later, my harmonic balancer fell off. Installed a new one, runs like a dream. |
Rob Rojo
Goo Roo
NSW
92 TT & 95 TT
Posts: 2772
Reg: 12-2007
|
If it does it at idle, unplug one one coil pack connector at a time and if there is a problem with a particular cylinder the car will run the same when disconnected.
also check that you havn't got the coilpack connectors around the wrong way or on the wrong coil. |
David Barnes
TryHard
Qld
Celsior V8
Posts: 308
Reg: 06-2008
|
Sounds like injectors/fuel pump ecu to me.
I agree with what rob said in regard to isolating which cylinder/s are causing the misfire. Also do the same with the injectors.
Its probably a fuel problem, but to eliminate spark from the equation, try removing the plugs one by one, once you remove each one of the plugs put it back into the coilpack and earth the thread out on something metal close by get someone else to crank the engine over and watch for spark, mind you best to take out the fuel pump fuse else the engine will try start.
You say replaced the fuel pump and fuel filter, but does this include the intake filter?
I would also be checking for fuel pressure, hook up a fuel pressure gauge (not sure what sort of pressure it should be but im sure someone here knows) could be a blockage somewhere. Seen it happen with the fuel hose in the tank, lil chunks of hose end up in the lines and cause blockage. |
Andrew Beutel
Tinkerer
Queensland
single turbo
Posts: 14
Reg: 02-2008
|
ok bit of a update havent tried much else have just got a fuel pump ecu to see if that changes anything but have been chatting to a highly regarded mechanic that knows the 1j/2j engines and he's suggesting it could be a cracked head but im hoping its not that serious. |
Walter Gillmore
TryHard
QLD
TT JZZ30
Posts: 376
Reg: 07-2009
|
check your cat for blockage.. just a stab but hey you never never know ;) |
Lew Radbourn
Goo Roo
Queensland / Goodna
jzs147 93 TT / uzz30 93'/
Posts: 3052
Reg: 07-2005
|
Andrew;
get a compression test and leak down test done on the cooling system first.
those two tests will help alot in finding out if the head gasket OR head is screwed.
then Look at what cameron said Camangle sensor and crank angle sensor.
thay are both prone to wires breaking right at the plug and the sensor end.
If it keeps on going Bring it down to brisbane I have a place that is brillant in checking through electrical systems to find faults
But do the couple of checks above first
cheers Lew |
Scott Gates
Goo Roo
SA
TT
Posts: 1699
Reg: 03-2007
|
i had a very similar issue to this a while back, and it ended up to be a break in a wire between the ecu and one of the injectors in the wiring loom, took ages to find too... |
Josh Totall
Tinkerer
SA
TT Manual & TT Auto
Posts: 23
Reg: 06-2009
|
i had this issue turned out to be spark plug gapping the guys on here recommended i use .7 and it worked a treat |
Jol Alexander
TryHard
Vic
UZZ31 V8 (no mods)
Posts: 407
Reg: 07-2009
|
Any chance your main ECU is resetting itself after each restart?
I'm getting at a 6 will always run •••• after the ECU is reset |
Andrew Beutel
Tinkerer
Queensland
single turbo
Posts: 16
Reg: 02-2008
|
tried new fuel pump ecu no good, but now the car has got worse. it starts nut then within 5 secnds it drops revs and stalls you can try to give it some throttle but it still dies. |
Justin Richardson
TryHard
tasmania
TT
Posts: 331
Reg: 06-2006
|
hey andrew check all the wires on your coil packs are the same way i had one the wrong way and it stuff it all up |
Austen Menze
TryHard
WA
GT-TL
Posts: 252
Reg: 07-2009
|
If you have an FCD, try removing it. I had an FCD that kept playing up and made my car run crap |
Blake Gloyn
DieHard
manawatu
soarer JZZ30 TT
Posts: 542
Reg: 02-2006
|
put an earthing kit all over your motor. you have tried virtually everything i can think of, so i can only assume the ecu is receiving a faulty signal from somewhere.
what fault codes are showing when you run diagnostics? |
Rob Rojo
Goo Roo
NSW
TT
Posts: 3080
Reg: 12-2007
|
The ISCV could be stuck open. |
Andrew Beutel
Tinkerer
Queensland
single turbo
Posts: 17
Reg: 02-2008
|
ok well i had am indepth look today at wiring and the coilpack wiring that goes down in behind the cam gears/timing belt area it seems that 1 of the wires may have split in half as theres about a 90degree bend and you cant feel any wire in a 2-3mm part of the heat shrinking so im going to check it out. |
Previous
