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Location:
Sydney
Registered:
October 2002
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 HELP - boost issues on GT4 - solved!
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Sun, 25 September 2005 13:13
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The GT4 is all of a sudden running like a dog...
The car:
Stock engine/turbo. No boost controller. Aussie DP. Boost gauge.
Background:
Car has been running great, other than a bad O2 sensor causing a rich mixture (new sensor on order), and an error code 13 (RPM signal) which I think is cos of the dodgy O2.
I did some work on the car yesterday - added an extra bolt to the DP/turbo to close up an exhaust leak. Also tightened the throttle cable nuts cos I discovered it was loose. Nothing too major, but...
Symptoms:
Now, as soon as it gets any kind of boost (like anything above 1psi), the car jerkily hesitates like nothing else, & only reaches about 3psi/4psi/6psi in 1st/2nd/3rd gears (should be getting about 5psi/7psi/11psi). Car pouring out black smoke at max boost.
The symptoms sound like it's gone into limp mode, but not sure that explains the jerky way it's running.
I thought I may have knocked a vacuum hose or something loose, but have checked everything. Engine runs fine off boost. Reset ECU to no avail.
Any ideas?
[Updated on: Tue, 27 September 2005 06:41]
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I Supported Toymods
Location:
Sydney
Registered:
December 2002
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Re: HELP - boost issues on GT4
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Sun, 25 September 2005 23:39
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Have you checked the intake air temp sensor?
If this sensor is stuffed it will make the car run like a dog.
Other than that my money would be on a vacuum leak somewhere.
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Location:
Newcastle
Registered:
June 2004
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Re: HELP - boost issues on GT4
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Mon, 26 September 2005 01:29
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Wantaturbo had the same problem with his, i think it was an air leak somewhere, either vacuum or somewhere in the intake. You might wanna pm him and see what he did.
Good luck.
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Location:
Bulleen, Melbourne
Registered:
June 2002
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Re: HELP - boost issues on GT4
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Mon, 26 September 2005 07:20
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Check the rubber coupling between the IC and the throttle body, when my one split it had similar symptoms. Apart from that, check all the usuals, intake pipes etc.
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Location:
Sydney
Registered:
October 2002
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Re: HELP - boost issues on GT4
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Mon, 26 September 2005 11:40
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Thanks for the suggestions. I'll check all those & let you know how I go. If not those, I'll go get a vacuum test done tomorrow...
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Location:
Sydney
Registered:
October 2002
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Re: HELP - boost issues on GT4 - solved!
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Tue, 27 September 2005 06:38
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Well, serves me right for being lazy...
When I tilted up the intercooler the other day to access the exhaust heat shield bolts I didn't undo the hose clamp around the intercooler to throttle body rubber coupling, so it's now got a nice big split nearly all the way around it.
I've taped it up & added an extra hose clamp temporarily - I can hear the air squealing out through the sides of the tape when I get close to 0psi!
By some minor miracle Toyota actually have one in the country (Melbourne) - it's a Group A specific part number. It'll be here in 2 days. By some other miracle, it only costs $30! Plus I've been to Toyota so many times now they give me trade prices!
I tell you what, it's pretty boring driving around at under 0psi... luckily I don't need to travel far, but I've got no other way to get around.
Thanks for the help guys.
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Location:
Bulleen, Melbourne
Registered:
June 2002
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Re: HELP - boost issues on GT4 - solved!
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Tue, 27 September 2005 06:46
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Haha when I needed one, there were none in Melbourne and it had to come from Brisbane, and it cost $48! Damn us Melbournites get ripped 
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Location:
Melbourne
Registered:
February 2005
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Re: HELP - boost issues on GT4 - solved!
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Tue, 27 September 2005 06:54
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i bought one 2 weeks ago too. it was also about $34bux
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Location:
Sydney
Registered:
January 2003
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Re: HELP - boost issues on GT4 - solved!
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Tue, 27 September 2005 10:11
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Yea sometimes your local Toyota dealer can be a good sort, I get trade from mine now. I went in one day and said I needed an oil filter for a 2JZ-GE and he just looked at me blankly, so I have him the part number for the filter and he grabbed it for me, then he said "what car was that in", I said, "a Supra", he was like "really can I have a look"?, so after about 15 minutes of gonig over my car, and the customers cueing up he gave me trade on all the bits I bought, and I get trade of him all the time now
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Location:
Colac, Victoria
Registered:
May 2002
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Re: HELP - boost issues on GT4 - solved!
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Wed, 28 September 2005 08:27
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My new group A adaptor came from Canberra - had some fun tracking that part down!
lance has my spare - though it was second hand - came with the group A motor in the grey thing
Its amazing how handy one little bit of rubber turned out to be for the intercooler piping - its perfect for 2.5 inch stainless
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