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Old 21-01-2010, 01:31 PM   #1
ayeyew
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Default Below around 1600rpm... car seems to stutter a bit!

What could be the cause of this?

Usually when I am stopped, and begin to accelerate slowly it takes 2-3 seconds to kick into gear. Before it kicks in, it kind of sputters, like it is gonna stall, but it never does stall. Had a scary experience when turning out of a corner in which I had plenty of time to make the turn, but those 2-3 seconds made it far too close for comfort.

I'm pretty sure it is not to do with the tuning of my car, cuz it has never happened before. I have reflashed the tune in and tried the 95oct tune, both with the same results.

It also occurs when i am in high gear, cruising with revs below around 1600rpm and put my foot down a little bit more, it hesitates.

I've seen similar threads where people have suggested leads? It has been around 18 months since i replaced them, so it could be the go.

Just wanna see any other opinions

Thanks wise ones

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Later.. 4.5L w/ BOOOOOOOOOOST or XR6T or AUIII XR8 220

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Old 21-01-2010, 01:55 PM   #2
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Could be leads, could be injectors/fuel
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Old 21-01-2010, 02:37 PM   #3
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Quote:
Originally Posted by Mr Hardware
Could be leads, could be injectors/fuel
+1
How many k's since your last set of leads?
How many k's since you last had your injectors cleaned (if ever)?
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Old 21-01-2010, 02:40 PM   #4
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Had my EF do this also, after changing the leads I found it to be the fuel filter. Pretty certain it was the factory item.

Maybe try changing that?
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Old 21-01-2010, 02:44 PM   #5
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Yeah the more I think about this the more I'm leaning towards a fuel issue

Both my AU's have done this, I never gave a crap about it because I never run my AUII on petrol and I never cared about the AU1 as it was purely a money-making exercise.

The petrol injectors on the AU's must be different to the E-series because i'm sure they're heaps more resilliant. If my AUII was an EL, i would expect at least two to be fully blocked by now, not just a tiny bit inhibited.

First step: change fuel filter and run a bottle of injector cleaner with bp98.

The problem I had with the AU1 i had did get a bit annoying if i wanted to burn someone off from the lights, I'd give it a full boot and the car would hesitiate with a quick 'blup-blup-BURRRRRRRRRRRRRRRRR'
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Last edited by Mr Hardware; 21-01-2010 at 02:50 PM.
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Old 21-01-2010, 06:40 PM   #6
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loss of vacum due to the larger cam that you have installed, my car did it when I had the bigger cam in but now I'm back to the stock one it doesn't. or maybe its the isc?
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Old 21-01-2010, 09:52 PM   #7
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Check leads and plugs, then replace fuel pump!
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Old 22-01-2010, 12:20 AM   #8
ayeyew
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Quote:
Originally Posted by dave93761
+1
How many k's since your last set of leads?
How many k's since you last had your injectors cleaned (if ever)?
Last set of leads, around 30,000 ago
I have only ever run injector cleaner through my car once (over 2 years ago)

Will be getting that injector cleaner on my next fill up

Then replace the fuel filter!

Hopefully that will solve it

Thanks guys! Will keep u all informed
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1999 Liquid Silver AU
Show: XR6 Kit, Low, RDA Slotted's F&B, Fully Tabouli Sound System, Altezza Tailights (Good ones!)
Go: K&N Pod w/ 3" intake, XR6T Snorkel, Pacie Comp 4480's, 2.5" Cat Back, CMS Stg2 Cam, Custom Tune, Tranny Cooler

Coming..CMS Stg2A Cam, 68mm TB
Later.. 4.5L w/ BOOOOOOOOOOST or XR6T or AUIII XR8 220

Currently:
151kW (165 on other dynos )
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