car juddering when under load

[guest1049]

I own a 2003 jazz and recently it has begun to judder as if it wants to stall when travelling at speed or when going up a hill. I have no warning lights on my dash, the cars dash display doesn't dim when it jolts/kangaroo's and when I took it to my local garage they could find no fault with it. It is worse when the car has warmed up.  I have my suspicions that it may be one of the ignition coils but as these are quite expensive I wanted to be sure before I bought them. 

Therefore, does anyone have any cheaper ideas that I could try first??

thanks

[DV]

At what RPM (range) are you experiencing that fault?
Have you had your spark plugs replaced at every 2nd service (25k miles)?

(EGR valve might be dirty:
http://clubjazz.org/forum/index.php?topic=557.0.)

[Ozzie]

In the past I have had a car with a broken HT lead, although I would have thought a garage would have picked this up. Basically as the car is sitting straight it was fine, but as you accelerate the engine tilts slightly (again when going up hill) the slight tilt moves the HT lead and opens the break making the lead arc inside the lead which makes the car run rough.

I hope this helps.

[chrisc]

In the days when cars had carburetors, fuel starvation would cause an identical problem.  Fuel pump/filter perhaps?

[bill888]

Could it be bad fuel ?

To cut a long story short, a friend had been experiencing a very intermittent engine stuttering symptoms in a 06 model for a few months.  The problem seem to resolve itself last month after they stopped using Tesco unleaded and filled up Shell unleaded. 

[guest1583]

 
hi
try to check egr valve if its clean or dirty, this is most common jazz fault
hope helps
when it comes to either tesco or shell fuels this does not matter since they are both 97 RON most standard on our fuels today, brand does not matter now it is standard whichever pump you go.

[culzean]

In the past I have had a car with a broken HT lead,

I hope this helps.

Jazz doesn't have HT leads as such - they have a separate coil for each plug ( GD has 8, GE has 4) - as far as I know there is no common fault that affects Honda ignition coils,  could be EGR or spark plugs need changing (or just the gap setting).  If you are going to go to the trouble of taking plugs out for checking it is just as quick to fit new ones.

[guest1049]

Thanks to all who have replied, to update you:

I only use BP ultimate because I do alot of miles as a community nurse so its worth the extra cost. I have changed EGR valve and no improvement. I have changed spark plugs, again, no improvement.  With regards to the RPM that this occurs its difficult to say as my rpm dial doesnt work.  the only way I can describe it is that its like I've suddenly put the car into 1st gear and it jolts and lurches forward,  only when engine has warmed up, it happens more on hills but can equally occur when travelling smoothly on the motorway for example.  I do both long and short trips throughout the day so I have to admit, I am more than a little stuped with  this one!! Nest step is looking at fuel filter.......will keep you posted.........

[JazzyB]

i would next look at the throttle area

[guest1583]

 
HI
I thinks using bp ultimate fuel or the regular one does not matter.
you have said that that you have changed the egr valve yourself?, did you replaced a brand new one?
As described it its like suddenly the car is in 1st gear and lurches forward, it does sound sound a transmission problem, which includes the clutch slipping away. it might be yeah, and does it bother you a lot.
on your previous thread youve said you have tried consulting a local garage, can you try another garage for an independent views.
by the way how many previous owner it got and whats the mileage on the clock says..
hope everything would be alright..

[guest3423]

Was it Honda that gave diagnostic?