Apexi Avcr - Troubleshooting!

[Marko R1]

hi guys,

my Apexi AVCR is tuned for 1.35bar - over the past few weeks the controller has been good...now when the car is on idle the boost vacuum displays at a max. of -760, then sometimes it drops to approx -500 on idle.

i am sure that previous to this when the car was on idle the vacuum was @ -300 to -400, is this the range where the vacuum should be at?

then at other times it will go to -760 & the no's do not move at all...what could it be???

(i should mention here when it is stuck on -760 the controller will not allow the boost controller to enter '+boost' hence no power from the car regardless of revs/engine loading)

my mechanic thinks that the solenoid valve is maybe faulty although it could be the boost sensor if it is not holding the correct vacuum on idle.

sometimes the solenoid goes nuts on idle as well - you can hear it ticking away like it is monitoring high boost - im lost!!!

any thoughts guys? whose brain can i pick...

Edited February 11, 2008 by Marko R1

[paulr33]

check the obvious- check where the map sensor is getting its signal from

check its wiring and vac lines - look for loose connections and leaks etc

if the unit is showing varying amounts of pressure at idle then it could be a leak

it should be around -500 ish on idle -760 sounds wrong and out of range (ie; the map sensor is going to 0.0v or is loosing connection the AVCR, loose wires)

unplug the map sensor at idle - see what the display drops to - as in the wiring signal not that actual vac line

[Marko R1]

i have checked the pressure sensor, here are the results:

1. ignition on (engine not running): the reading fluctuates between -100 to -200

2. engine idle: shows -400 to -500 then sometimes sits on -760 (max reading) not steady at all!

i then tried with the engine on idle & i unplugged the pressure sensor loom & left the vacuum line intact: sits on a max. reading of -760

i will check the 2 wires that run from the pressure sensor to make sure they are secure - it seems to me that the issue is the presssure & not the solenoid, if the wiring & vac. lines are intact where can i get a pressure sensor? i live in sydney

Edited February 11, 2008 by Marko R1

[Marko R1]

check the obvious- check where the map sensor is getting its signal from

check its wiring and vac lines - look for loose connections and leaks etc

if the unit is showing varying amounts of pressure at idle then it could be a leak

it should be around -500 ish on idle -760 sounds wrong and out of range (ie; the map sensor is going to 0.0v or is loosing connection the AVCR, loose wires)

unplug the map sensor at idle - see what the display drops to - as in the wiring signal not that actual vac line

i unplugged the map sensor @ idle & it reads -760, does this mean that the unit is faulty or the sensor?

my mechanic thinks that i need to replace the entire unit it as it should read 0 when the map sensor wiring is unplugged

[MR 33]

Hmm sounds like the sensor could be stuffing up. Got mine for around $90 delivered from nengun.

http://www.nengun.com/apexi/avc-r

[Marko R1]

Hmm sounds like the sensor could be stuffing up. Got mine for around $90 delivered from nengun.

http://www.nengun.com/apexi/avc-r

how long did it take for the delivery from nengun?

if u have the same boost controller can u pls do me a favour...unplug the wiring for the map sensor with the ignition on only (engine not running) & let me know what your boost reads on the display?

mine is @ -760 (vacuum) but apparently it should be 0, if u can let me know then i can confirm whether its the map sensor or the actual unit itself.

thanks,

marko.

[paulr33]

if you unplug the map sensor signal (green wire) it will default to the lowest value which will be -760mmhg

[MR 33]

Haha damn i shoulda waited. Yeah goes to -760 when ya unplug it

Delivery takes the usual 3-4 weeks which can be a pain if you need a part asap.

Edited February 12, 2008 by MR 33

[Marko R1]

if you unplug the map sensor signal (green wire) it will default to the lowest value which will be -760mmhg

the map sensor has 3 wires which are pink/grey/white.

the only green wire in the avcr loom is the 1 that goes to the ecu loom which is an earth wire that splices into the black ground wire

which green wire are u referring to?

it might be easier if u send me your mobile number so that i can call u - this thing has got me stumped!

[paulr33]

there is a big delay on apexi parts, specially map sensors and solenoids

i ordered a solenoid back in late december im still waiting for a shipping ETA date from apexi

[jenkies]

sorry to ump on board this thread i am anuable to help but i am alsl having a few issues with my avcr. no matter what boost i run thru it as soon as it gets into posative boost it starts ticking away like crazy?? anyone know what could be causing this??

any help would be extremely appreciated

mark

[Marko R1]

i think the answer is to replace the avcr with another controller - im looking at the hks evc6, they use a stepping motor which is supposed to be much more accurate than a generic solenoid as used on other boost controllers

not keen on spending $1000 but then again it includes installation & tuning on the dyno