Jump to content
SAU Community

Recommended Posts

hey ya'll

my rb25det this morning at idle -60mmhg

rebooted car, checked throttle etc, all normal, no error lights, no whack sensors

idle is -60mmhg ish and goes to -10mmhg when you open the throttle

the car drives ok and makes boost but peaks out at 0.40kgcm2 and wont go past

engine seems to run ok, doesnt feel laggy etc, drives normal, no smoke, no bangs etc

the reading is coming from the apexi map sensor which uses the plenum signal that the stock guage uses

the stock guage is unplugged - ill check pressure with that tonight

assuming the sensor isnt whacko and manifold pressure is actually -60mmhg at idle

what does this mean? usually its around -550mmhg and it rises slowly with an even throttle into positive boost pressure

i havent checked anything mechanical / physical yet - will do that tonight

Link to comment
https://www.sau.com.au/forums/topic/202558-loss-of-vacuum-on-idle/
Share on other sites

rebooted car

haha classic

i had the same thing happen on the road. pulled over, and was extremely grateful to find a split vacuum hose (at the T running to factory/aftermarket boost gauges).

i bet you're relieved

yeah very

i thought i had lost compression etc but then i realised that probably wasnt possible as it ran reasonable ok and made boost

i was surprised it ran so well and made 0.40kgcm2 boost with a split hose - i thought idle would have been poo, smoke at idle etc and lots of popping farting as its basically atmo mode

yeah surprisingly, if it wasnt for the strange boost readings, i wouldnt have really noticed a problem. when i checked under the bonnet, motor running, there was quite a bit of pressure coming from the split. it was hissing and carrying on pretty loudly. but idle was fine.

all sorted - its a split vacuum hose

Could have dropped me an email today man, or called me as ive seen that heaps haha :D

Used to happen to me all the time as i didnt have a cable tie on my VAC line for ages due to me being lazy ;)

that happened to me, but the locator on the inlet cam snapped and the bolt worked itself loose and it retarded the inlet cam god knows how much.

Compression test read 30psi in each cyl, and the engine still ran! lol

Replaced the cam and its all good now :(

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now


  • Similar Content

  • Latest Posts

    • This looks great! Awesome to have the 5 speed with an LSD in this. The Recaro's look like SR2's or SR3's. It's a shame they've been retrimmed as they would have looked sweet in their original colours. I think I'd want my agent to be a little more up front and informative too. I've never imported but I reckon it would make me a little nervous, so the more info the better.
    • Thanks for doing that Duncan! Makes you a good person in my books. We don't get kangaroos or wombats here. But we have bats and it's similar. AFAIK it's often the mums with a baby attached that get hit because they drop lower when starting from a tree. If you hit an animal, check on it. https://www.ifaw.org/au/resources/wildlife-rescue-app An app to get the closest wildlife rescue contact.
    • My dream is also to have a proper hoist, but I don't think it will ever happen. My quickjack is probably as close as I'll ever get, it really is very good though. 
    • Yeah we keep on in the dailies, it is pretty poor how many animals get hit and the driver leaves without checking....have saved a couple of little ones over the years. Bit of a gruesome job though, pouches generally need to be cut open because they are so tight and often the joey doesn't realise mum is gone so they are still locked onto the teat. I checked the modules in front of the DS wheel where an oil cooler should go.... There is the radar unit - that can go for race use) One of the 2 HX water pumps, the silver cylinder. That needs to be kept but might be able to be relocated But the bad news, the big computer mounted vertically in front of the wheel (blocking any potential air exit) is the electric steering computer. That is required until/unless i do a hydraulic steering conversion, and in CAD based modern car design it is not like I can just pop a big unit like that somewhere else (plus the loom would be too short anywhere else too). So, the passenger side is OK to clear out (just use a smaller washer reservoir, potentially elsewhere), but the DS no beuno
    • Well, all the best with the new camry It was interesting to hear about the UK process, it is generally a lot more streamlined here with a shipping agent looking after all the import side (noting the exact final price can still be a surprise.....) and I've used a few different brokers on the japan (or US) side, and never had any trouble with any of them....luck of the draw I guess. You mentioned you didn't get the auction sheet (understandable since you bought it from a dealer, not auction), but I always try and get hold of that because they are pretty thorough. I've imported 2x R grade vehicles over the years and both were fine, repairs in Japan are pretty thorough compared to here in Oz.
×
×
  • Create New...