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Location:
Perth
Registered:
January 2004
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JZA70 1JZ Problems
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Wed, 21 April 2004 14:49
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Having a problem with my surpa at the moment. Its a 1JZ-GTE.
At present, it has a weird idle where it will be fine and then drop about 100 - 200 revs and then get back up to where it normally is. And then it may drop again quickly after and then rise back to normal.
Whilst driving it tonight, I noticed that it was driving really rough, in that power wasnt constant, it was stuttering through the rev range. Then, on accelartion, the car was making full boost yet it felt like it was being retarded for some reason ? Also during this period, If you hit the accelarator, there would be a delay before anything was felt.
Later on, I was in first, accelrated hard, changed in to second let the clutch out, pushed down the accelrator only to be greated with nothing at all... it didnt rev at all. It felt like an intercooler pipe had blown off after this but over the next km of limping around, it righted itself and began to drive normally again ?
What could be causing this ? Perhaps low fuel pressure / Dirty injectors ? Which would indicate an intermittant fuel pump ... This would explain why it has gradually gotten worse and worse - i.e. the fuel pump is degrading. Alternatively could it be a bung spark plug ? Or Perhaps even a bad sensor ? If it were the spark plug or map/crank angle sensors, if one failed, would imply that it would've just suddenly happen instead of gradually getting worse and worse.
What do you guys think could be causing this ? I have to fix it!
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Location:
Melbourne
Registered:
May 2002
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Re: JZA70 1JZ Problems
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Wed, 21 April 2004 15:21
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Firtly check your fuel pressure (VDO electric oil pressure gauge is ideal for this)
If thats ok and not droping majorly under load look at your coil pack connectors, apparently common for them to go brittle, crack and become lose shitty connections.
If a cyl is not firing it will cause the unburnt fuel to ignite in the exhaust manifold that will cause the turbo too spool but it will run like a bag of shit
Allan
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Location:
Gold Coast
Registered:
May 2002
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Re: JZA70 1JZ Problems
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Thu, 22 April 2004 00:31
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You can also look at changing the fuel filter.
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Location:
Perth
Registered:
January 2004
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Re: JZA70 1JZ Problems
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Thu, 22 April 2004 07:13
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I checked the coil packs today. Only to find, once I had unscrewed the cover, that the rack holding the 2 coil packs into place on the front cylinders was rocking about willy nilly and not bolted in properly.
So after bolting it in so that they were firmly in place, took the car for a drive and noticed that it was running better, and that it wasnt holding back anymore on full boost.
However, I thought this had fixed the idling problem as well since after I started it for the first time it was idling steady as. Drove down to the shops, went shopping, came back, started the car and then the idling problem started again.
Got home and checked the rack which was stil nice and firm.
Thus far, the major problem has gone (but I havent driven it that much) but the idling problem has not. Could this be something to do with the ECU ? Or could it still be spark plug related ? or the problem I hope it is NOT, fuel related ?
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Location:
Vic
Registered:
April 2004
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Re: JZA70 1JZ Problems
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Thu, 22 April 2004 09:52
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Have you had your injectors cleaned recently?
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