engine briefly loses power whilst accelerating at low speed

[pez]

Hello all,

This is my first post but I have read many since buying my jazz a couple of months ago. I have 2 issues that I need some advice on please:

1) The car at low speed whilst accelerating occasionally loses power, almost like an automatic changing gear. Mine is a CVT an so no gear changing is taking place. The CVT fluid is a year/2000 miles old (changed by Honda) and the car has done 48K. I read that spark plug changes are sometimes advised, but Honda say they should be good for a good while yet. I have also read that the ERG causing lurching problems, but these seem to be more like bunny hopping and not just the odd hiccup.

2) It hear a faint but definite creaking sound from the front of the car. A bit like the suspension is a bit stiff! This seems quite common on this car but no definite reason.

Apologies for the vague descriptions but any advice would be greatly appreciated.

[dave12335]

This happens to me too. A couple of hiccups at low revs. Even after changing plugs. Although that helped a lot and now it’s not too bad.

[sparky Paul]

Loss of power at low revs, suspects in order of likelihood:

1. Sticking EGR valve. Replace, or remove and clean thoroughly with carb cleaner, paying particular attention to the making sure the shaft is clean and moves freely.
2. Spark plugs, all 8 of them, and particularly the ones at the back which are often overlooked.
3. Failing coil pack.

Yes, any of these can cause odd stutters at low revs, EGR is going to be the favourite.

Suspension issues, as per post on the other thread.

[dave12335]

Good summary sparky Paul.

For some the problem is alleviated with using sport mode. Does a reduction in symptoms with sport mode imply its more likely to be plugs than EGR ? Or vice versa? Or can’t say either way ?

[pez]

Thanks Sparky Paul,

My car is off to the garage next week (an independent), who will clean the EGR valve for me whilst doing the service... if that doesn't work, the spark plugs are gonna get it!

[culzean]

Thanks Sparky Paul,

My car is off to the garage next week (an independent), who will clean the EGR valve for me whilst doing the service... if that doesn't work, the spark plugs are gonna get it!

If I had bought a mk1 I would replace plugs anyway, so many garages do not even know the engine has 8 plugs and just replace the visible ones at the front, there are many posts on this forum where rear plugs have been removed and the gaps are huge as they have never been changed since car was new , the large gap also has the knock on effect of making the coils packs fail.

[pez]

Interesting.... I have been led to believe by Honda that the OEM iridium plugs are good for 75K at least and so no need to even look! I'm happy to do them even thought a set seems to be £150 minimum.

I myself have never owned a car which I didn't change the plugs on every year, so I'm well out of my depth here.

[culzean]

Interesting.... I have been led to believe by Honda that the OEM iridium plugs are good for 75K at least and so no need to even look! I'm happy to do them even thought a set seems to be £150 minimum.

I myself have never owned a car which I didn't change the plugs on every year, so I'm well out of my depth here.

The MK1 DSi engine not fitted with Iridium plugs as standard they are bog standard copper alloy cored plugs and normally get changed around 20K IIRC - Jazz only got Iridium as standard in MK2 i-VTEC onwards.

You can get standard NGK BKR6E -11 plugs for about £3.50 each and Iridium less than a tenner from Opie oils..   Why not compromise and replace the hard to get to rear plugs with Iridium and the easy-peasy front plugs keep as standard.  Plenty of info on this forum about changing rear plugs - do a search in MK1 section

https://www.opieoils.co.uk/f/100151/38366/2006/spark-plug.aspx

[pez]

Interesting, that's not what my Manual says or what Honda says.... the owners manual says it has NGK DIFR6A13G plugs!?

[pez]

NGK say these are the closest to the OEM https://www.opieoils.co.uk/search/go?w=difr6d13

£20 a pop!

[culzean]

NGK say these are the closest to the OEM https://www.opieoils.co.uk/search/go?w=difr6d13

£20 a pop!

Are you sure you have a MK1 i-DSi twin spark engine ?  Those  plugs in your link are for a MK2 VTEC ( they were the ones originally factory fitted to my wifes 1.4 MK2 - see below ) and have a bigger gap as standard ( the 11 and 13 at the end are the gap in mm,  1.1 and 1.3 mm )  - The plugs in the link I posted include the standard copper plug for MK1 -I-DSi and the others shown are same thread length, heat range, gap and spark position.

There is some confusion with the MK numbers on Jazz,  there was an older Jazz ( before 2002 ) that was the MK1, and so the i-DSi GD twin spark is shown on some sites as MK2 - where on this site we start with MK1 in 2002 ....

You can trust the Opie database,  I replaced the NGK DIFR6D-13 OEM plugs on my MK2 a couple of years ago with NGK IZFR6K-13 from Opie on their recommendation and they have been great.

The Denso Iridium are shown as having a life of 100,000 miles ..... they have Iridium centre and platinum earth electrode - both are fine points ( 0,4mm and 0,7mm).

[sparky Paul]

Interesting, that's not what my Manual says or what Honda says.... the owners manual says it has NGK DIFR6A13G plugs!?

Your other thread says you have a 2008 GE3, same as our mark 1.

The correct plug for the I-DSi engine in the GE3 is NGK BKR6E-11, as stated above. Should be changed every 25,000 miles or 2 years.


Just had a quick look in our GE3 Owner's manual, on page 305, spark plug type for all engines is listed as

NGK: BKR6E-11
DENSO: K20PR-U11

Are you sure you have the right book for your car?

[culzean]

What does the plastic cover over top of your engine say?  it will either have i-DSi  or i-VTEC moulded into it

If i-DSi = 8 plugs - standard copper / nickel

i-VTEC 4 plugs ( and they will be 70,000 mile Iridium from factory ).

Here are some forum links

For i-DSi plug change

https://clubjazz.org/forum/index.php?topic=7491.0

For i-VTEC plug change

https://clubjazz.org/forum/index.php?topic=10479.msg63962#msg63962

See this thread - it is a short thread but there are links in it to other threads. There are also a few threads on this forum about getting access to plugs on i-vtec MK2, as they are not easy to get to without taking some of the scuttle off.

Couple of youtube videos on here

https://clubjazz.org/forum/index.php?topic=9164.0

[pez]

Hello all,

Thanks for all the help so far, I can only say I'm still a bit confused at this stage though. If it helps my Jazz is an 08 manufactured in China Jazz and the GE3 model number came from the Vin Number.  Unhelpfully it doesn't appear to say i-DSi  or i-VTEC moulded into the engine cover. But here's a picture.

The owners manual that came with it states on page 439 in the tech spec that the plugs are NGK DIFR6A13G, but it also states that the engine is a 4 stroke SOHC i-VTEC gasoline engine.... I wonder if I've got the right owners manual!

[culzean]

That is definitely the i-DSi engine you have.   That rectangular space under the Honda Logo is where the i-DSi badge should sit,  looks as though it has been removed or never fitted.

When was the brake fluid changed ? looks a bit dark coloured in that photo..
 

I have attached a couple of  photos of i-Vtec engine in a PDF