Hi all zfans my transmission on my 1990 NA is skipping between 3rd and 4th gear (OVERDRIVE)it is very annoying its . Without changing throttle position it cant decide what gear to stay in even on the highway at 100km it stays in 3rd and goes to fourth but very quickly at the same speed goes back to 3rd i am getting very bad fuel consumption ,can anyone help i live in melb ?????
try this (copied from tech section) AT diagnostics To begin a diag it is best to take a short drive 2 or 3 miles to ensure full working temperature has been obtained first.and then switch OFF the engine With overdrive switch in on position and lever in P switch on ignition but do not start engine,the A/T lamp should lit up for about two seconds then go out. Switch off the ignition and move selector lever to D also switch OFF the overdrive, switch the ignition ON but do not start the car. With the ignition still ON and after more than 2 seconds move the lever to 2 follow this by switching the overdrive switch ON.Then move the lever to 1, and set the overdrive switch to OFF. Still with the ignition on depress the accelerator pedal fully and release it. The A/T check light will now flash the appropriate blink code as deatiled below. After this to retrurn to normal switchOFF the ignition and move lever to P and set the overdrive back ON. Fault codes are read as follows: A long flash indicates the start and is not to be counted One long flash and No 1 blink long rest normal = Revolution sensor circuit fault One long flash and No 2 blink long rest normal = Speed sensor circuit fault One long flash and No 3 blink long rest normal = Throttle sensor circuit fault One long flash and No 4 blink long rest normal = Shift solenoid `A` fault One long flash and No 5 blink long rest normal = Shift Solenoid "B" fault One long flash and No 6 blink long rest normal = Overrun clutch solenoid fault One long flash and No 7 blink long rest normal = Lock up solenoid fault One long flash and No 8 blink long rest normal = Gearbox fluid temerature sensor circuit fault One long flash and No 9 blink long rest normal = Engine revolution sensor circuit fault One long flash and No10 blink long restnormal . = Line pressure solenoid circuit fault One long flash and 10 equall length blinks...... = All clear NOTE If when attempting this test no A/T check lamp operation a system check of the inhibitor switch,overdrive switch,kickdown switch or idle switch circuit will be required.
Your car had a code 34, and dead 02's mate, thats the reason for the high fuel use, those two things have been fixed. The auto AT diagnostics showed a "Revolution sensor circuit fault" the engine is also well down on power, due to lack off matainance, every connector is damaged, the fuel filter was so old the internal's had collapsed to form a solid lump which I showed you, the filter was the age off the car, and that is the tip off the ice burg. Your car is in dire need off some TLC.
Thanks mate i really do appreciate your help and look forward to doing the rest of the work you told me about ,hopefully there is no valve damage,CHEERS
nah man live about 2 hours out of melbourne. Plenty of members in the city who should be able to help you though
Sounds like the exact problem I am having with my auto for the last few months, & it is very annoying when highway driving I agree, although my AT diagnostics showed up all clear minus any errors. All the best. Cheers, Mike
Check you throttle position value. 0.45v at idle and 4 volts at WOT is ~where it should be. If outside these specs, then gear change points will be affected, possibly causing your problems. Your TPS also contributes to your fuel and ignition timing, so will affect economy
Hey mate, have a quick read of this thread Here. (As Pexzed also mentioned in mine) I checked my TPS (Throttle position sensor) with a multi meter, but I received the correct reading. Another thing I haven't got around to doing yet, is finding a wiring diagram for the Auto transmission as Airstyle suggested as well, so that I can trace all the wires to it & the shifter to see if there's any obvious problems. If all else fails, I will be taking mine to a Transmission specialist. I was quoted just over $1000 to get it reconditioned. Cheers, Mike
I forgot to add he brought a new TPS, which was installed and set @.45v, although there was nothing wrong with the old tps. The problem with his auto is connected to his very low power motor, which has never been looked after.
Yes its a shame, the car needs quite a bit off work to get it up to speed, the engine and auto problems are just the start, but Emmanuael loves the car, and I think he understands that installing new 02's and tps is only a bandaid fix, for his fuel econ problem. The car is quite straight, and worth fixing imo!
Absolutely, looking at the photo, it looks damn nice! Not to mention, clean. All I can say is best of luck to him! It'll definitely be worth it. (Well I can't speak, I've only owned mine for a year, & still a lot of things to go over & fix) Will look forward to seeing some of the results later on down the track, mechanical-wise anyway. By the way, is that a Bomex type wing over the stock spoiler combo? I like. Cheers, Mike
Not sure what brand wing, but its comming off, so I could be for sale when he gets round to removing it. Here's a pic from the back, the duck tail is part off the wing.
Cheers for the offer mate, I've actually got the same now that I have seen the photo, waiting to be modified! Cheers, Mike
