Intermittent drop in power

[PeterMcGinley]

Hi all, first time poster, long time Jazz driver.

Over the weekend I was driving for about half an hour, when out of nowhere my car felt like it had a weird lurch. Kind of like a hiccup. I was doing about 80km/h, just cruising on a highway. And since then, it's done the same issue a couple of times.

It happens mostly, but not all of the time, when I accelerate from a set of red lights. And sometimes it might happen if I'm just cruising along a freeway.

It'll just hiccup for half a second, no real noticeable drop in power but you can feel it lurching. At worst, it'll hiccup three times in succession - not often.

My gut tells me it's a fuel pump issue. I thought it was a misfire, but I can't hear or feel any cylinders dropping out. Wanted to know if anybody had a similar issue.

I'm driving 1600km to South Australia this weekend, so I'd kind of like some reassurance!

My car's a 2007-spec Honda Jazz, 1.3L GLi, auto, +140,000km.

Cheers!

[curtis265]

any CEL's?

weird sounds?

[PeterMcGinley]

No lights pop up when it happens, it doesn't feel like it's going to stall on me either. I just sort of let it do its thing and it goes away, not really doing anything to aggravate it. No weird sounds either. I'll try to record some video/audio of it when I go for a drive later today.

[curtis265]

No lights pop up when it happens, it doesn't feel like it's going to stall on me either. I just sort of let it do its thing and it goes away, not really doing anything to aggravate it. No weird sounds either. I'll try to record some video/audio of it when I go for a drive later today.

Good idea


























http://www.ozhonda.com/forum/customavatars/avatar39303_1.gif

[PeterMcGinley]

http://www.ozhonda.com/forum/customavatars/avatar39303_1.gif

[BiLL|z0r]

Gearbox/engine mounts?
Mine started stuff like that before a gearbox mount packed it in.

[GU357]

hmm, 1.3L DSI jazz jumping could be a CVT related issue.

I've heard of some prety crazy wack stuff happening to the MINI cooper CVTs thats simular to this i think.

when does it happen? hot days? cold days? certain speeds? certain engine speeds?

[PeterMcGinley]

Gearbox/engine mounts?
Mine started stuff like that before a gearbox mount packed it in.

I actually had an engine mount break on me just after the 105,000km. It made a different noise that time.


hmm, 1.3L DSI jazz jumping could be a CVT related issue.

I've heard of some prety crazy wack stuff happening to the MINI cooper CVTs thats simular to this i think.

when does it happen? hot days? cold days? certain speeds? certain engine speeds?

That's what scares me most. It doesn't seem like gearbox, at least by the way it sounds and otherwise feels like. Can't hear gears trying to run for freedom.

It's not discriminant when it does it. It lurched a bit more when I filled up a full tank earlier tonight. It'll happen anywhere from just after launch, or even if I've been cruising for about half a minute. It'll subtly do it even at 100km/h, but it's more around city driving speeds where it appears most - well that's where I do most of my driving.

I recorded some vision of my rev counter it while I was driving earlier today, which I'll upload when I get a spare moment before I consult a mechanic and accountant.

[GU357]

the cvt has no gears? so u want hear them running it has a belt pulley system where the pulleys get bigger to change the ratio

[PeterMcGinley]

Gearbox/engine mounts?
Mine started stuff like that before a gearbox mount packed it in.


the cvt has no gears? so u want hear them running it has a belt pulley system where the pulleys get bigger to change the ratio

I've obviously got no clue how CVT works! Just my hunch tells me it's somewhere engine wise, but I'm clearly no engineer.

[GU357]

hmm.
well a CVT gear box has the input shaft drive a pulley and the pulley spins a belt which spins another pulley.
the other pulley turns the drive shaft (through a wet multiplate clutch) that then drives the wheels.
both of the pulleys change size to create the multiple gear ratios. so a small drive pulley and large driven one is a low gear for taking off, high revs low speed
this is why its constantly variable transmission.
because the ratios can be constantly changing to suit your throttle position and where the power is in the engines rev band.
so full throttle engine knows u want max power power so sets the gear box to a good ratio to keep the engine at 5000rpm (or where ever peak power is) and constantly changes the ratio till its closer to 1:1. its very smart.

anyway just take it to the mechanic im no engineer either but i like to know important things about my car.

[GU357]

http://upload.wikimedia.org/wikipedia/commons/d/d7/GearBoxRotRotVar.gif

[PeterMcGinley]

http://www.youtube.com/watch?v=7byB8_JP8qw

Here's the anticipated video of my car derping up. Hopefully this'll give me a more solid diagnosis with all you Honda boffins! I'll try to find time tomorrow to get an opinion from a non-virtual mechanic. Hope the diagnosis is, bearable :/

[GU357]

is that it at 20 seconds?

[EKVTIR-T]

Have you checked for ecu error codes?
Would do this before going to mechanic

[GU357]

Just because theres no CEL doesnt mean the ECU is unaware that something is wrong?