Blow Back Thru The Turbo?

[stavros01]

Hi guys having problems with my Rb25det R33 auto its an intermitant problem and never happens when at the workshop

firstly i thought i was just a simple fuel filter problem as the car was stalling and reluctantanly came onto boost generally blowing a big puff back thru the airfilter? so I replaced the fuel filter witch was totally clogged up with crap the car went fine for a week then it started doing it again I checked fuel filter all good took it to the mechanics they serviced it, it went fine untill a day later same symptoms decided to drop a walbro gss341 pump in as ive used em before no worries took out the old which ended up being a bosch 040 my second favourite pump, problem is still there cleaned afm with co-cleaner replaced the new fuel filter just in case, any suggestions would be appreciated generally I can source a solution on here with out posting but this time im stumped.

[T04GTR]

try swappping a crank angle sensor.

[stavros01]

no worries will take a look thanks mate any other sensors worth looking at would love to find a known working afm if anyone has one

22680-31u00

[stavros01]

Hi guys I am still struggling to get my skyline up and running i have now totally changed every sensor recomended throughout these forums workshop dont really want to no about it anymore they cant figure it out, so what now? any suggestions would be great I dont expect a miricle answer just next place to start, ECU maybe? its auto can i still get a aftermarket setup? apexi wont work maybe cheaper to swap engine but what if its something not on the engine? any help would be great thanks

update - no earth straps connected now connected elimated turbo back fire and rich smoke from exhaust on hard exaleration and cleaned idle up remarkable could this have dameged something not being earthed?

new coils- yellow jacket

new sensors on engine got am all im sure

new fuel pump walbro

new fuel filter

injectors untouched so far have run cleaner thru though

afm swapped 3 times so its definatly ok

full tank empty no diff still does it

20 hours fault finding in work shop at $85.00 per hour im sure they spent way more time on it

sypmtoms are car runs sweet as then it will just pig root around like its on 2 cylinders and stays that way no matter where you are rev wise, and regardless of what load is on the motor, a/c on and off no diff was running fine for almost a year then this happened, car drives 1.2km a day 5 days a week.

[scotty nm35]

I guess I would start measuring the resistance of every wire on the ecu, back to its sensor, starting with the afm? It sounds like a bad connection/broken wire. Was one of the afm's new? They didn't all have had loose wires inside did they?

Good luck.

[Don Dada]

S1 rb25det?

Have u changed /serviced or cleaned the pins on the ignitor?

[DVS JEZ]

Pull the plugs and see if they are fouled up or cracked.

If ur only driving 1.2km per day chances are the plugs may be fouled

[stavros01]

thx for the replies, i have just installed new plugs as part of the elimination process, its a series 2 engine etc but the car itself is one of the ser 1.5, ill look into the ignitor I will do a search after this to find out where it is located, im regional but would like to replace the coil harness any chance sum one has one for sale?

scotty 2 of the afm's are on still working skylines, mates that work out in the mines so a could use theirs' while they whernt in town it is starting to sound like a connection or wire problem within the harness so i will need lotsa luck how hard is it to just replace the whole harness?