I suffer a similar problem and am searching for answers, the hesitation occurs intermittently with no load on the engine, i.e. cruising between 2-3 k. After speaking to Kzed I thoroughly cleaned a number of connectors, AFM, PTU, temp sensor. Initially thought I had solved the problem, car ran beautifully for a week. Now it is back and getting worse every day. Only seems to happen after between 5-10 minutes of driving then will disappear before returning at random times. The hesitation symptom is a sudden loss of power, feels like taking your foot off the accelerator. Depressing the clutch or changing gears brings the power back up. Could this problem be a symptom of the O2 sensors needing replacing?
Amandas zed gets this when starting from cold. Goes away once its warm. Feels like a major fuel starvation. When i get time i plan to take off the fuel filter and see what crap falls out. Was only replaced a year or so ago. Apart from that ive done within normal service work, all the above that tom has. Except for the components swap. As its intermittent, it generally isnt entirely a electronic component thats failing - intermittently. Any updates Thom-bhoy? Hows the little red rice rocket going?
No updates to report yet Chris, taking it down to have the EGR blocked off tomorrow, so we'll see how that goes Gonna suss the Fuel Pump next if that doesn't work
Tom my NA once displayed very similar symptoms!.......& it turned out to be a faulty TPS! So while you are at it (if you haven't done so already??).......swap the TPS!...... plus check it is set correctly using ConZult (0.46V I think is correct?)
I've tried 2 different TPS's Pretty sure it was set to 0.46v. Either that or 0.44, can't remember 100%.
I have an idea. Maybe its the operator. He gets a little too scared when the raw na power comes out to play at the 2-3k mark. Gets scared enough that his foot lightens off the pedal and hence giving you a surge...than feels the commode next to him is beating him, so he hammers the pedal again. Growing the berries. :br: That or, could an irregular flow in transmission oil allow the auto box to slip at a particular rev range? Not every time, but occasional enough that it becomes a commonly noticed habit? Also what is your grounding like tom? A recent development with my turbo dato ute has been an occasional lack of power. After some brief investigation, as to why my battery also got sucked dry, was that it was applying a voltage through the body. Obviously a power cable has worn through and is earthing to the body. Such a pita job to find, but it maybe something to consider. How much leakage you have across the body? Grab a volt meter and see if you can pick anything up.
EGR was pretty thoroughly blocked anyway, so I doubt it'll fix the issue... Just bolting up the blocked off pipe now, will report again soon
I have an idea. Maybe stfu O2's have been disconnected, no more surging and no more hesitation. YAAAAAAY
yeah, but not TOO much this time much less than if I'd needed a new furl pump! I'm just glad that it doesn't bog down off the line anymore. Almost got me in strife a few times whils trying to make less than sizable gaps in traffic
For the people in the know. How long do O2's last? As mentioned amandas does it when its first starting off cold. But i had replaced the O2's with NGK units straight away when she bought it. Maybe 2+ years ago now. Thinking it was a reason for excessive fuel usage. Call motor traders tom. Quote them the part number and ask for the NGK trade price. I did this after talking to the SA rep from NGK and he told me to tell them a particular price. If they didnt sell it at that he would chase them up. Maybe food for thought for you Thombhoy.
Fuel type & condition of spark plugs etc can effect how long the O2 sensors will last but normally ~150000Kms it seems for a Z32. If you run avgas then they fail very quickly so a good idea to pull them out & fit a bung if you intend to do that for track work etc (they don't get used when beating the car to death on the track in any case). Oh that's right ya can't use leaded fuel anymore or the greenies will hunt you down & hug you to death.........
Ok thanks. Well last i looked at the plugs they were in good condition, but i may have another look. I cant imagine the O2's will be buggered, as it feels like a fuel starvation when taking off from a cold start and goes away when warm, so i think ill look at the fuel filter again. Its because of you're girly features tom. I can help myself. :rofl: Nah, i went down this track ages ago. The stores all tried to rape me on price. So being me i go straight to the source. Get it for what it should be, without the massive mark up. Any troubles and let me know, ill throw the company i work for, weight around and see what price i can get.
Looks like might have finally fixed the hesitation and surging problem, took the car to Gavin Wood who attached Consult while performing on road driving tests. While cruising along at about 60K in 4th the TPS voltage would start to creep up until it would hit 5 Volts, the ECU then shut everything down. Within a few seconds the voltage would return to normal then engine power would return. He returned to the workshop and was able to recreate the problem with the engine under load. After conducting more tests Gavin replaced the faulty TPS and the car seems to be running perfectly again.
didn't i suggest that like 10 posts earlier? i just went out for lunch at work. 5min drive. gave it few bootfulls along the way 2 -3 times. than drove slowly till we got to macca's. got into the car started and noticed revs were bit low. noticed it was missing and occasionaly it will run ok. driving it stuttering and running on 5 or less cylinders. once passed 3000rpm it drives normaly. bellow 3k it bogs and stutters. first time it happend now to me. since im at work don't have my consult cable to check it out. (maybe should keep it in the car) not sure what the problem is but im suspecting maybe heat soak and the PTU. it is S1. ill wait till it cools off and try it again. last time i played with the PCV and had few plugs disconnected and rerouted the O2 sensors properly. i may go try now disconnecting the 02 sensors and see if it goes away.... man im sick of 02 sensors.
Cough, Microtech, cough cough MAP sensor, cough. Electrical bugs do give you the shits after a while. Oh, while im here, any news about the Temp Warning unit you've remodeled?
Sanuske not sure whats with it. And there was I saying last nite how good it was :rofl: Microtech??? MAP???? dont have any of that (i think)? i do have a microtech turbo timer but don't think that would cause my issue. i did give it one big rev out to redline. but was fine afterwards. it just started misbehavin after 30min sitting in the car park and on the way to work. just been there and disconnected the o2 sensors.no its not them didn't think it was. they look brand new. without the consult cable to hopefully point me into right direction (if it pops up) ill be unplugging few things and rechecking grrrr. (and i thought i have a quiet lazy evening tonight watching top gear. TWD still sitting in the box. awaiting on the list "THINGS TO DO" i tried few times and walked back inside. too many things to remove and wasnt in the mood. worse one is getting the temperature sensor wire from the ECU. so i'm waiting till i wire in the AVCR and do that at the same time. hopefully before temps pass 30C. now this problem with it makes it even further down the list.
