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Location:
Sydney
Registered:
May 2002
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1JZ Still breaking down under boost
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Wed, 24 September 2003 14:04
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keep breaking own when the map sensor hits around 4 volts @ about 0.75 bar of boost my AF ratio is at 12:1 almost all the way accross....now going nuts 
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I supported Toymods
Location:
Epping, Sydney
Registered:
May 2002
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Re: 1JZ Still breaking down under boost
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Wed, 24 September 2003 15:07
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"breaking down" ?
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Location:
Sydney
Registered:
May 2002
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Re: 1JZ Still breaking down under boost
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Wed, 24 September 2003 23:26
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almost feels like the comp is making the engine missfire or boost cut its driving me nuts
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Registered:
September 2002
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Re: 1JZ Still breaking down under boost
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Wed, 24 September 2003 23:41
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Gday,
I'm really no expert but just having a bit of a guess, have you checked for error codes stored in the ecu at all ? i know that some toyota ecu's can just retard the performance when certain sensors are not giving correct read outs. Does the engine check light come on when you feel this 'break down' ?
The engine isn't hitting some sort of boost cut is it ? or the ecu isn't getting an invalid boost reading or something ? i've seen a similar thing happen in a gt mr2, almost like a fuel cut off.
Anyway, even if i'm way off hopefully I've helped in some way 
Catcha,
Seeks.
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Location:
Sydney
Registered:
May 2002
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Re: 1JZ Still breaking down under boost
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Wed, 24 September 2003 23:51
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my check engine light is always on error code its giving is "You idiot! Engine is in wrong car!!!"  hehehe i'm seriously thinking of hooking it up to a diag machine now....im thinking either the map sensor is stuffed of it coils else i'll take the thing to a scrap yard and get it crushed 
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Registered:
September 2002
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Re: 1JZ Still breaking down under boost
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Wed, 24 September 2003 23:55
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| mx83toy wrote on Thu, 25 September 2003 09:51 |
my check engine light is always on error code its giving is "You idiot! Engine is in wrong car!!!" hehehe i'm seriously thinking of hooking it up to a diag machine now....im thinking either the map sensor is stuffed of it coils else i'll take the thing to a scrap yard and get it crushed
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Heheh, well a diag machine might be the go. As far as the "you idiot! Engine is in the wrong car!!!" goes, hehehe, the ECU doesn't have a clue what car the engine is in. As long as you have the right ECU with the right engine, the engine check light shouldn't be throwing errors at you, should it ?
I got hold of a diag machine to check my 20v why the engine light kept blipping on to be safe, it said it was due to me not having an o2 sensor reading. Which made sense considering i hadn't got my hands on one yet
Catcha,
Seeks.
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Location:
Sydney
Registered:
May 2002
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Re: 1JZ Still breaking down under boost
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Thu, 25 September 2003 00:01
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cool! i'll hook her up soon
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Location:
Parramatta
Registered:
July 2002
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Re: 1JZ Still breaking down under boost
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Thu, 25 September 2003 02:49
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look at the spark plugs is the heat range to hot???? ummm also the sparl plugs and also change the coil that may help.
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Location:
Gold Coast
Registered:
May 2002
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Re: 1JZ Still breaking down under boost
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Thu, 25 September 2003 05:08
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I had the same problem for alittle while, would come and go. I've put it down to bad fuel. Try some octane booster in your tank.
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Location:
Sydney
Registered:
May 2002
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Re: 1JZ Still breaking down under boost
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Thu, 25 September 2003 07:27
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found the prob it was my map signal to the comp.... thanks all
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Location:
Sydney
Registered:
May 2002
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 Re: 1JZ Still breaking down under boost
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Thu, 25 September 2003 14:50
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  It wasn't the prob!!!! 
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Registered:
June 2002
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Re: 1JZ Still breaking down under boost
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Thu, 25 September 2003 21:14
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Have you hooked up a check light?? If not do so.
bridge the connections TE1 & E1(someone correct me if it isn't thos ones) in the diag box and watch the check light when you turn the key on.
The diagnostic codes are the same for all toyota engines.
My 1JZ had a similar problem to yours and it spat out the code 31 (3 flashes then 1 flash of the check light), found an old 1GGE engine manual, fault code 31, air flow signal, must be the MAP sensor on the 1JZ, replaced it, happy camper!!
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Location:
Newcastle, NSW, Australia
Registered:
May 2002
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Location:
UK
Registered:
May 2002
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Re: 1JZ Still breaking down under boost
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Thu, 25 September 2003 23:20
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This sounds like plugs. The 1JZ exhibits these exact symptoms when you have fouled plugs... and they dont even have to be that bad. It sounds too obvious but its normally the cause.
Have you checked them?
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Registered:
March 2003
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Re: 1JZ Still breaking down under boost
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Mon, 29 September 2003 09:21
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i have the same problem, but i know its because im using plugs that are too hot for the engine. Im using NGK heat range 8, and i think i should be using a 6
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Location:
Wollongong
Registered:
May 2002
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Re: 1JZ Still breaking down under boost
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Mon, 29 September 2003 11:09
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Heat range 8 are colder than 6 with NGK plugs.
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Location:
MACKAY
Registered:
May 2002
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Re: 1JZ Still breaking down under boost
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Mon, 29 September 2003 11:24
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If you are using platinum or iridium plugs pull them out and scrap them , Put in a set of DENSO K20PR-U and give that a go .
Trevor
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I supported Toymods
Location:
Epping, Sydney
Registered:
May 2002
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Re: 1JZ Still breaking down under boost
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Mon, 29 September 2003 13:23
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BKR6E or BKR7E
8 is probably a bit much
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Location:
Gold Coast
Registered:
June 2002
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Re: 1JZ Still breaking down under boost
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Wed, 01 October 2003 01:33
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i had the same problem.... i put in some BKR5E's
works a dream now
do u get alot of unburnt fuel come out on boost?
has to be under load though... so maybe get someone to drive behind u
Pete
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Location:
Preston
Registered:
June 2002
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Location:
Gold Coast
Registered:
June 2002
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Re: 1JZ Still breaking down under boost
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Mon, 06 October 2003 06:02
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plugs were too cold...
try 6E's or 5E's
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Location:
Sydney
Registered:
May 2002
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Re: 1JZ Still breaking down under boost
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Mon, 06 October 2003 06:15
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well if its running really rich and the boost cut is comming in too early i'd say your prob is the map sensor
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