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Location:
Melbourne
Registered:
August 2003
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3SGTE - Strange Boost Problem
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Fri, 10 October 2003 00:43
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Hey guys (and gals?)
I have a very strange problem. Last night whilst out and about I had a unfortunate over-rev situation. This ended with the engine light coming on and the car appeared to be in some sort of "Limp Home" mode. It could be driven OK, but as soon as the turbo tried to kick in the engine management shut it down (cutting fuel I think). The check engine light illuminated for around 5 secs. Driving under the boost was fine (although a little pedestrian).
After pulling over, shutting the car off and checking a few things I gingerly applied pressure and got boost, then more boost, and more . . . . got to around 1.1BAR and then fuel cut/check engine. Then continues to drive ok, but as soon as boost comes on it gets shut down (no boost for you, naughty boy).
So I stop and switch off for 5 mins and then carry on with lots of boost, can drive it OK at around 10-13 psi. Normal boost maxes around 7psi. I do not have a boost controller. Whilst I am enjoying the extra boost (as long as I am careful not to over do it), I am concerned as to the actual cause of this??
Any ideas??
D
1992 Celica GT4
[Updated on: Fri, 10 October 2003 00:44]
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Location:
Cabramatta, NSW
Registered:
May 2002
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Re: 3SGTE - Strange Boost Problem
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Fri, 10 October 2003 01:09
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Wastegate not opening?
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Location:
Canberra
Registered:
June 2003
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Re: 3SGTE - Strange Boost Problem
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Fri, 10 October 2003 04:22
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Scud,
Sounds like you have a split in you wastegate actuator hose or something similar that is allowing too much boost. The ECU can only allow aprox 8psi as max boost when it opens the VSV fully so to get any more boost there has to be a bleed in the system or your wastegate is getting stuck. Hence you are hitting the boost cut.
To reset the boost cut pull the engine fuse for 30 secs. First of though you need to check out all the vac lines thoroughly. While you are doing that may as well disconnect the VSV line (the one that disappears off behind the engine from the wastegate actuator) and plug the port. This will give you much more consist boost and stop the ECU playing silly buggers with your fun  Get yourself a cheap bleed valve...they are all pretty much the same and do the job just as well as each other. Turbosmart gated bleed valves are approx $100 and work well. Now you can set boost just below the boost cut and enjoy the extra power consistently.
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Location:
Melbourne
Registered:
August 2003
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Re: 3SGTE - Strange Boost Problem
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Sun, 12 October 2003 04:53
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hmm, I think I'll take it in and get it looked at, maybe get a quote to hi flow the turbo and maybe a dump pipe. Thanks for the info.
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