Honda Jazz fuel problem.

Daughters car, 2002 Honda Jazz, CVT transmission, 240k. Car is hesitant to start and pick up revs initially. Makes no difference if it is in gear or neutral. I tried it out and when sitting in neutral and pressing the gas pedal it gives the impression that it is starving of fuel, gradual pressure on the pedal gets the revs up but stamping on the pedal makes it all but stall. Once the revs are up you can idle back, select drive and away you go. Doesn't happen all the time but is worse on initial start up. Has also happened occasionally at intersections which is a bit scary. Has been to the doctor but problem persists. Any ideas where to look please.

Once had a Mitsa that did exactly the same. never figured out what it was but.

Fuel filter?

ok can you drive it still drive it when its warm floor the accelerator and make it rev hard out for 50 meters not exeeding the speed liminit or burnouts or things like this.
?

from your post 1 all i need to know is the answer to my post 4 and i can rule out a fuel supply problem by about 85% just with the information and knowing how things work

I personally have no idea but it did made me wonder if mechanics are not subject to CGA, or if they billed for their time to diagnose a problem and didn't find it because it obviously has a problem? Would this not come up on diagnostics if you have the right equip?

Just got me thinking as I'm looking at cars and my current older one has very limited engine management but new ones have lots, and I have looked at Jazz's, and a Colt to see today too.

Hi Intrade
Yep, once mobile I can floor it from an idle and it goes like a cut snake.

din x did you read my threads i adressed this issue loads of times your older car has not got a limmited engine managment , what it does have is huge tollerance for possible compensation. as where newer cars have less and less room for errors and the components fail on new cars like a domino that falls over and only once all domino stons are down the thing stops and thats the end of it as you got to then repair all that faild not just the 1 part that you can guess to be wrong on older engine managment systems
So you do actuarly have symptoms well befor these new cars show problems when you know how it works and when you check things are functioning correctly with oem level diagnostic scanners and knowing what the stuff is your looking at and what it has to be showing.

ok what needs to be looked at is how it makes its idle, is there a stepper motor with scanner that can graph the pids you look how mucht the engine managment has compensated the idle air controller and if it sticks from carbon , the carbon stuff should be a swaptron mechanic task , it vast depends on what componets it uses and you check things tick the box if its ok and move on to the next possible one that is
A vaccume leek also cant be ruled out but my money is in a idle air control function sticking problem fault to be checked first.

^ ^
Thanks Intrade. Will look into that.

Hi intrade, that makes sense and no I haven't read your older threads, I was musing. I didn't realise that was a prequisite here but it seems to be a theme but I am glad someone can advise OP.

Its something that has occured to me that cars are more complex at it will be a cost I will need to consider or stick the older 90s cars that have their own issues. But having seen a family member spend hundred of dollars to just get a diagnosis (not any parts or any repairs/replacements trying to resolve the problem) of a sensor fault causing loss of power while moving (very dangerous). 3 mechanics said the fault codes were inconclusive I wonder how CGA applies when 2 of them were unable to diagnose he problem but only a specialist could. One relatively inexpensive sensor and all fixed in that case.

RE 11 i keep telling all my clients to stick to 2000 toyota with older engine under the bonnet and look after the car rust wise only other alternative is for example a dacia sandero imported brand new from uk only the base model and even that has almost to much crap fitted already with stability control and all the rest of crap compulsury on new cars
The problem of incompetent in diagnosing is actuarly originating from the car manufacturer them self with there supposed fool proof 600 page flowchart to spend 10h on a diagnosins that would take 30 minutes if they trained them to us a oscilloscope and give out information instead to try and boycot the aftermarket with no system information .
So what they do is tell you nothing is wrong and blame the car owner for faults brand new cars have that random self accelerate.
When i was in europe i happened to see this and i still have the freeze frame data print out of this pile of crap citroen c4 brand new the same heap of junk you see in the supermarket from farmers i think i see the heap in nz.
Here is what happened i shut the car off after a short drive 2km from cold or so, then desided to get it a bit closer to the pedestrian curb so i had to start it again .
as soon as i turned the key it fired up and reved its nuts off with screaming engine and all i done is start it , so i turned it off and it did keep reving for 5 more secounds.
The freeze frame reads something like this
Engine off ,
8400 RPM
milage 834km
error unknowen bsi control module.
That is all the citroen main dealer managed to get out of it with his dealer tool , and he was messing abouts and said he could do nothing and it was fine when he went for a test drive.

a few weeks ago .
i did hear the pile of crap launched forward and then braked hard on its own on a intersection like 2 meters , frightening the hell out of the 74 or so year old owner , they sent it back again to where they purchased it with of course guess what all ok. when they kill them selfs it be 74 year old steped on accelerator instead of brake , blaming the driver when the car should go in to a crusher where this dangerous french crap belongs , peugeot ar no better the nz diagnostic tutor had a similar story of a pile of junk rental peugeot that self accelareted hard so he stomped on the brake as hard as he could he said as that overrides anything else going on.

remember these are main dealers who plug in the diagnosis equipment and want to change parts from what ever there equipment tells them they are employed by the manufacurer , instills a lot of confidence when you know what friggen morons they are.

Update. All sorted. Thanks intrade. Idle air control valve gummed up.

Well done Intrade.

Well on a older car that would be the most likely cause from the accurate enough symptom discription and the first thing you check and rule out on this what muste be a OLDER style engine managment
as a possible cause for the discribed symptoms.