flat spot/fuel hesitation at low throttle inputs

[hussar10a]

Can anyone point me to the thread that ran some time back on the above subject please ?

I have tried the search function to no avail, and manually gone back 25 pages with no luck (other than aching eyes!)

My 4.3 is getting worse with a noticeable hesitation/very slight "hiccuping" in all gears at low revs, although it does quickly clear as the accelerator is pushed down harder/further.

I've always had the lovely V8 popping and crackling on downchanges and trailing throttle, but it now pops on changing up too which I'm pretty sure I don't remember happening in the past.(Although of course I could be wrong !)

There are no warning lights etc, but fuel consumption has dropped a tiddly amount - approx 1 mpg.

(Rick @ DMS if you are reading this I will do a throttle flap clean tomorrow as the first step to getting to the bottom of it).

Thanks chaps,

Nick

Edited by hussar10a on Sunday 6th March 13:08

[jonamv8]

Mine felt a little like that - 57 V8V - although it sounds like yours is a little worse. Since it's remap it's not a problem. I'm interested to see whether it's an indicator for any other issues though?

[shunt]

Throttle flap clean fixed exactly what you describe on mine.

[hussar10a]

Thanks chaps .

2 minutes work this morning, and all is fixed.

Edited by hussar10a on Monday 7th March 11:02

[Good Soil (Pete)]

hussar10a said:

Thanks chaps .

2 minutes work this morning, and all is fixed.

Edited by hussar10a on Monday 7th March 11:02

What did you do?

[hussar10a]

Cleaned the throttle body flap as per the DMS video.

Then took it out and thrashed the guts out of it for a couple of miles !

( Of course the fairly polar change of driving style triggered the check engine light and engaged " limp home mode ", sorted by switching off, waiting 30 seconds and restarting and oddly it drives even more smoothly after that - bit like rebooting a computer I guess )

Edited by hussar10a on Monday 7th March 14:25

[alxce]

Just out of interest what did you use as the cleaning agent? I don't have any injector spray and was wondering whether WD40 would be suitable or failing that some isopropyl alcohol.

[hussar10a]

I wandered across the lane to my local garage and scrounged a couple of squirt of carb cleaner.

I guess the iso alcohol sounds ok as it leaves no residue, not sure I would take the wd40 route, although I must be honest that I considered using my shotgun cleaning spray !

[Shmee]

I had my first upshift pop at the weekend (7krpm from 1st to 2nd), ignoring the fact that it sounded absolutely amazing I also have the lazy pickup feeling at low revs so really need to get around to this. For those of us who don't have much time or effort to get it sorted can it just be taking to a dealership and they'll do it?

[hussar10a]

It really does only take 2 minutes !

( would guess a dealer would charge a minimum of 30 mins/1 hour for that maybe ? )

[Shmee]

hussar10a said:

It really does only take 2 minutes !

( would guess a dealer would charge a minimum of 30 mins/1 hour for that maybe ? )

There's also finding the equipment - certainly don't keep anything like that spray stuff in my flat! Then there's finding an appropriate place to do it and I don't think a London street counts, also don't have any form of pliers to tighten it back up with either; basically a whole lot of work and run the risk of getting something wrong I'm sure, however simple it looks.

[hussar10a]

There isn't much to get wrong as basically all you are doing is wiping a
piece of metal with a piece of rag.

I take your point about tools and London streets though !

It definitely doesn't need to be a dealer for this - if you have a local garage they will have all the stuff and will probably charge a tenner while you wait !

[shunt]

Shmee said:

also don't have any form of pliers to tighten it back up with either;

Are You a ghey

[hussar10a]