My N/A auto has a fuel temp sensor fault code, does anyone know if this will contribute to it stuttering when I plant my foot only when the car is up to running temp? She runs beautifully up till she gets to running temp, problem is I don't want to get it any stick until it's at temp.
As far as I am aware, the FTS only increases the fuel rail pressure when the fuel temperature is high, to reduce the chance of fuel "vapour locking". Now, if your temp sensor is faulty (open circuit), then the ECU will read a temperature of 80 deg C even if the fuel is cold. Best is to throw datascan on the car and see what the fuel temperature is reading. At operating temperatures, I doubt this would lead to misfiring, but in the Zed world anything is possible. I have previously forgotten to reconnect this sensor, and noticed no difference in how the car ran.
thanks, I'll give that a go I'll check next time I get a chance. It's not misfiring, just when I plant it, it dies and then she picks up again, momentary but noticeable from cold to hot and a pain when trying to take off fast from a stand still........if you get my drift
The fuel temperature sensor, built into the fuel tube, senses fuel temperature. When the fuel temperature is higher than specified, the E.C.C.S. control unit turns the P.R.V.H. control solenoid valve ON and raises fuel pressure.
so, faulty FTS means the ECU reading 80C all the time, increasing fuel pressure, might cause problems you would think at lower engine temps as opposed to running temp???? I have ordered a new one and hopefully get it by the weekend, fit it and keep my fingers crossed it helps. I've replaced the old air filter box, had the AFM cleaned, new plugs, new injector connectors, new TPS connector, bridged out a faulty det sensor with the resistor, new fuel filter.......not many easy fixes left to get to the bottom of this...........any other suggestions anyone can offer would be greatly appreciated
Make sure all your coil pack connectors are in good condition and pushed on firmly. Also, remove and clean and retension your CAS plug. Also, check the operation of the fuel damper, if that is faulty, fuel can flow down the vaccum line and back into the balance tube.
coil pack connectors are original, pretty crappy on the outside but no corrosion like the injector connectors. Will check the actual spade terminal has a good connection. Also will check the CAS, Karl reset the timing back to 15degrees a month or 2 ago but we didn't check the connector. I'll do a search for fuel damper testing. Will keep you posted, thanks Greg.
fuel damper/regulator just done a quick web search, found a tech on US site. I did notice on the weekend when doing the injector connectors, there is a little hose on each of the damper/regulator that are very loose, didn't know what they did when I put it back together late friday night (now I know what the damper/regulator are). Will replace them asap and clamp them as well, no clamps just pushed on, come to think of it now, they could be some sort of vac hose. Also sent Caz a PM to get some inside info from him.
check check your O2 sensors.... slow, lazy or dead O2 sensors cause the hesitation symptoms you describe. Check them on datascan. If you want to test this, simply disconnect them. If it is the O2 sensors, the car will run better without them and then you know you have to get them replaced. Cheers
Cheers, will do when I get a chance to put it on consult. Had it on there a couple of months ago and Karl checked them, said they looked ok, could be better but they looked ok. I'll chase him up again, see if we can put it on again, disconnect them etc
checked damper/regulator vac lines and trimmed them back until the internal diameter was a good fit and cable tied them on to get a good seal. Seems to have helped a little although it was hard to tell as last night when I test drove it, temp was down to 11C, so the car was running beautifully!!!! Anyway, get my fuel temp sensor today and will check the O2 sensor operation as soon as I can. Maybe they are both contributing a little. Thanks again for your help.
