www.gt4dc.co.uk
Maintain, Modify and DRIVE your GT-Four


It is currently Thu Mar 28, 2024 8:24 pm




Post new topic Reply to topic  [ 6 posts ] 
Author Message
 Post subject: OEM Boost Gauge
PostPosted: Mon Sep 09, 2013 5:43 pm 
Offline
Group N
User avatar

Joined: Tue Apr 10, 2012 9:27 am
Posts: 409
Location: Chirnside, Scottish Borders
Car Model: ST205
Ive got an issue that has seemed to crop up recently with my oem gauge. When the car idles the gauge indicates positive boost and when any throttle is applied the needle shoots off scale (still vacuum in manifold). Only when feathering the throttle whilst driving can I get it to read -ive. It seems almost too sensitive to throttle movement. I have an HKS boost controller that indicates boost and the engine is fine, it seems to be an indication fault.

Usually I would just think nothing of it however Im worried that it may be driven by the ECU rather than directly from the sensor. If this is the case will the ECU be fooled by a bogus sensor and fuel incorrectly??

Sorry Im crap at explaining however I hope you can all help

thanks

marcus

_________________
FN2 Civic Type R w/Mugen Parts
Toyota Celica GT4 ST205
Toyota Celica GT4 ST185


Top
 Profile  
 
 Post subject: Re: OEM Boost Gauge
PostPosted: Mon Sep 09, 2013 6:56 pm 
Offline
Group B
User avatar

Joined: Sat Sep 02, 2006 3:13 pm
Posts: 3679
Location: Bournemouth
Car Model: None
My 205 boost gauge has developed a similar fault with it's boost gauge except mine is random, it just seems to wander about all over the place. The test is to check it reads 0 with the engine stopped and ignotion on.
In my case, the ECU is(was) reading correctly as the mixture was correct on the AFR gauge so a gauge or wiring but not a sensor fault.
Not bothered looking further as it's a long distance motorway car for me.

_________________
If at first you don't suck seed, try drier grain.

Image


Top
 Profile  
 
 Post subject: Re: OEM Boost Gauge
PostPosted: Mon Sep 09, 2013 7:03 pm 
Offline
Group N
User avatar

Joined: Tue Apr 10, 2012 9:27 am
Posts: 409
Location: Chirnside, Scottish Borders
Car Model: ST205
Cheers Chris

Yea, my meter doesn't read 0 with the ignition on, reads about 2/3 +ive pressure. Which sensor drives the meter then? Is it the drivers side one near the brake booster or is it the pass side one with a couple of inputs, one from the chargecooler and the other from the inlet manifold??

_________________
FN2 Civic Type R w/Mugen Parts
Toyota Celica GT4 ST205
Toyota Celica GT4 ST185


Top
 Profile  
 
 Post subject: Re: OEM Boost Gauge
PostPosted: Tue Sep 10, 2013 12:24 pm 
Offline
Group B
User avatar

Joined: Sat Sep 02, 2006 3:13 pm
Posts: 3679
Location: Bournemouth
Car Model: None
The one on drivers side, also known as map sensor which also feeds the ecu. Unlikely to be sensor unless the engines running very rich.

the one you mention on passenger side is aircon idle up valve.

_________________
If at first you don't suck seed, try drier grain.

Image


Top
 Profile  
 
 Post subject: Re: OEM Boost Gauge
PostPosted: Tue Sep 10, 2013 2:48 pm 
Offline
WRC

Joined: Sun Oct 01, 2006 2:14 pm
Posts: 1098
Location: sunny sleaford- lincolnshire
Car Model: ST205
Mine has the problem intermittently, it doesnt affect the car at all from dyno sessions showing the fueling to be typical gtfour mapping and after changing the sensor and still slightly irratic but again, dyno showed no problems with regards to afr's so paid no attention to it since


Top
 Profile  
 
 Post subject: Re: OEM Boost Gauge
PostPosted: Tue Sep 10, 2013 3:55 pm 
Offline
Group N
User avatar

Joined: Tue Apr 10, 2012 9:27 am
Posts: 409
Location: Chirnside, Scottish Borders
Car Model: ST205
Im in the process of ditching Aircon so thats good to know, One less sensor needed in the engine bay.

thanks chris/dale

_________________
FN2 Civic Type R w/Mugen Parts
Toyota Celica GT4 ST205
Toyota Celica GT4 ST185


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 6 posts ] 


Who is online

Users browsing this forum: No registered users and 30 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum

Search for:
Jump to:  
Powered by phpBB® Forum Software © phpBB Group