My mates R32 has been having engine problems. Not being able to rev past 4 k on full throttle. Cutting out here and there. We changed the plugs and than i got my datascan program running, we hooked it up, went for a drive and noticed the O2 guage was all over the place. Is this normal. I mean ranging from 10 to 90 on partial throttle and all over the places on half throttle but staying 98 99 when on full throttle apart from the engine cutting ouut at 4k sometimes. If so is it hard to fix and expensive ???
If the Skyline air induction system is similar to the Z32, then I would suspect the MAF/AFM sensor. Clean the connector and/or replace the MAF/AFM and see what happens. Otherwise, no idea!
afm's I have no idea about your O2 readings but in the pass with a few R32 GTR's we have had the same and it has been the AFM's sometimes we have had to change both .
well he bought a new AFM, changed it over and it did nothing for the car so that ruled that out. Anything else
O2's completely normal. So will the engine rev out under partial throttle? Theres couple of easy places to look. Get the car to idle, and then wiggle the CAS plug, if it cuts out then theres your proplem. If your plug isn't 100%, when the engine torques on full throttle it can lose contact on one of the pins. And will cause a cutout generally around full boost time. UNplug the plug and clean and tighten the female connectors. Other than that, you could have a serious split in a hose, causing the motor to lean out to the point of no bang under full throttle. Doubt it would be AFM related, if busted they'll cut out at 2500rpm. Unless its the afm plug. Do the same as mentioned above for the CAS.
doubt its the piping, we just installed a hyrbid bolt on intercooler kit for it so all the piping is brand new and we checked and rechecked for any air escaping. WIll try the plug thingy. If not is there anything else that it could be, he's gonna have a mechanic to check the O2 plug just in case.
O2 behaviour sounds perfectly normal. O2's will flick between 0.1 and 0.9 at light throttle, as thats when they are utilised. The ecu will go into open loop when you open the throttle right up, and o2's will generally read max voltage. If you've rulled out an air leak, then it'll be electrical related, either cas or afm plug, or at worse the units themselves. You've ruled out the AFM as being faulty, so go from their, look at plugs for all your major sensors. Have you done a diagnostic on the ecu?
not yet, only got the datascan part working where i could view it, other program on there the datalog viewer isn't working
