Can anybody share some ideas as to what might be happening please, scenario: my car is an auto tt and run 98oct petrol driving around town usually as low as 40 - 50kph in traffic and sometimes i accelerate suddenly when i see a gap in the traffic but change my mind so the revs go up to 2500 - 3000 for a split second the drop below 750, sometimes doesn't recover and the engine stops, (pita) doesn't happen every time but I can usually recreate the conditions, sometimes it happens at traffic lights or trying to pull out into traffic from a side street. this has been happening for a while, even had a service checked the spark plugs and adjusted the tps. and checked air fuel mix at the exhaust Anyway the tps reads at .46v as the engine dies, i watched it on ecutalk. fuel pump seems to generate enough pressure as i can't hear it working overtime. Would the afm voltage read high for a split second telling the ecu to dump some fuel then theres no air to burn it with could it be air/fuel mix too rich? how would you fix that? Cheers Bruce
wouldn't a severe vac leak cause rough idle, the motor runs great and boosts well generally responsive, idles smooth. by the boost pipes do you mean intercooler pipes?
Clean the IACV and also check for vacuum leaks. My bet is on a dirty (sluggish) IACV. Btw, unless you've re-chipped, your ECU is tuned for 95 RON.
K-Zed its your old car and i believe you re-chipped the ecu so is it tuned for 95? the det sensor has been bypassed, could 95 cause detonation? is there a tech article on cleaning the iacv?
I had an issue where the car would randomly die. I searched all the normal stuff like you are and it ended up being the immobilizer. A stick/faulty immobilizer solenoid was immobilizing the car mid drive and killing the engine. Just something to consider.
when my car had these exact symptoms it turned out the air regulator shown in the above link was seized. it can be stripped and cleaned as well.
Give all the connectors under the bonnet a good going over checking for corrosion and loose fitting. Especially the injector and coil ones. Can cause motor to die and in my case would have to wait an hour to restart. Cheers Dave
I was thinking that some surge of air is lost and not compensated by the ECU. A vac leak evident upon acceleration could be a boost pipe connection (or vac line related to pressurised metered air) failing (such as a tear/or losseness) but still remain attached or closed - allowing for smooth idle/less strenuous pressures.
