4.8 Engine Sputter Rev Bounce at 2000 rpm

Engines and Engine Systems
karldDanneberg
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4.8 Engine Sputter Rev Bounce at 2000 rpm

Post by karldDanneberg » 26 Dec 2017 10:17

Hi Guys

I need advise on where to start looking, I have a 6 hour drive lying ahead of me and this strange phenomenon has crept into my beloved troll.

https://youtu.be/C_FTGfqX44A

Sequence is like this.

1) Cold start
2) Slowly idle out
3) Gently accelerate to 100 kmh
4) As engine touches 2000 rpm
5) it Starts sputtering, if I maintain a static hold on my accelerator it will continue to bounce. It is the engine that is sputtering, almost as if there isnt fuel coming through. (i have new filter in)
6) when I back off the accelerator and allow the revs drop & the accelerate again and then it’s fine,
7) Once it’s at operating temperature it’s pretty much gone.


Any clues where I should start looking

Thanks Karl

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hugejp
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Re: 4.8 Engine Sputter Rev Bounce at 2000 rpm

Post by hugejp » 26 Dec 2017 10:44

Hi Karl,

I had a very similar issue last december...

We went down to Durban from JHB for a week.

The Patrol stood for the duration of the trip as we were walking distance from the beach.

The day we planned to return to JHB she was spluttering on starting issues & the rev bounce at 2000rpm.

We got back with no issue, but under extreme acceleration & restarting at fuel stops the problem resurfaced.

Turned out to be the MAF that needed replacing.
----------------------------------------------------------------------

You CAN with a NISSAN!

Jy KAN met 'n DATSUN!

Clem
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Re: 4.8 Engine Sputter Rev Bounce at 2000 rpm

Post by Clem » 26 Dec 2017 11:17

Yo! Couldn't have been cheap...

karldDanneberg
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Re: 4.8 Engine Sputter Rev Bounce at 2000 rpm

Post by karldDanneberg » 26 Dec 2017 12:07

hugejp wrote:
26 Dec 2017 10:44
Hi Karl,

I had a very similar issue last december...

We went down to Durban from JHB for a week.

The Patrol stood for the duration of the trip as we were walking distance from the beach.

The day we planned to return to JHB she was spluttering on starting issues & the rev bounce at 2000rpm.

We got back with no issue, but under extreme acceleration & restarting at fuel stops the problem resurfaced.

Turned out to be the MAF that needed replacing.
Okay awesome...Ill open it up and clean with compressed air to see if it helps. If not then Ill have to replace.

Much appreciated and will give feedback.

karldDanneberg
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Re: 4.8 Engine Sputter Rev Bounce at 2000 rpm

Post by karldDanneberg » 26 Dec 2017 12:49

hugejp wrote:
26 Dec 2017 10:44
Hi Karl,

I had a very similar issue last december...

We went down to Durban from JHB for a week.

The Patrol stood for the duration of the trip as we were walking distance from the beach.

The day we planned to return to JHB she was spluttering on starting issues & the rev bounce at 2000rpm.

We got back with no issue, but under extreme acceleration & restarting at fuel stops the problem resurfaced.

Turned out to be the MAF that needed replacing.
Strange coincidence, my Troll stood for 4-5 days in a nose-down position before this issue came about!

Ill clean the MAF and test over next day or so, if no improvment then Ill buy a new MAF.

Btw what mileage does your troll have?

Thanks Karl

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hugejp
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2003 4.2 tdi GRX "The Coal Roller"
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Re: 4.8 Engine Sputter Rev Bounce at 2000 rpm

Post by hugejp » 26 Dec 2017 12:58

Clem wrote:
26 Dec 2017 11:17
Yo! Couldn't have been cheap...
Yes.
It stung a bit... but afterwards I did feel the difference.
----------------------------------------------------------------------

You CAN with a NISSAN!

Jy KAN met 'n DATSUN!

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hugejp
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Re: 4.8 Engine Sputter Rev Bounce at 2000 rpm

Post by hugejp » 26 Dec 2017 13:01

karldDanneberg wrote:
26 Dec 2017 12:49
hugejp wrote:
26 Dec 2017 10:44
Hi Karl,

I had a very similar issue last december...

We went down to Durban from JHB for a week.

The Patrol stood for the duration of the trip as we were walking distance from the beach.

The day we planned to return to JHB she was spluttering on starting issues & the rev bounce at 2000rpm.

We got back with no issue, but under extreme acceleration & restarting at fuel stops the problem resurfaced.

Turned out to be the MAF that needed replacing.
Strange coincidence, my Troll stood for 4-5 days in a nose-down position before this issue came about!

Ill clean the MAF and test over next day or so, if no improvment then Ill buy a new MAF.

Btw what mileage does your troll have?

Thanks Karl
At that stage she had 235 thou on the clock .

It was also extremely humid in Durbs.

With regards to a clean, MAF cleaner spray is available.
----------------------------------------------------------------------

You CAN with a NISSAN!

Jy KAN met 'n DATSUN!

karldDanneberg
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Re: 4.8 Engine Sputter Rev Bounce at 2000 rpm

Post by karldDanneberg » 26 Dec 2017 13:02

was there any change to your fuel consumption?

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iandvl
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Re: 4.8 Engine Sputter Rev Bounce at 2000 rpm

Post by iandvl » 26 Dec 2017 13:03

karldDanneberg wrote:
26 Dec 2017 12:07

Okay awesome...Ill open it up and clean with compressed air to see if it helps. If not then Ill have to replace.

Much appreciated and will give feedback.
I would recommend cleaning with an aerosol Maf cleaner or Electro Clean and not compressed air.... Those filaments are very thin, and I think compressed air may cause some issues.

Keep us posted.

karldDanneberg
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Re: 4.8 Engine Sputter Rev Bounce at 2000 rpm

Post by karldDanneberg » 26 Dec 2017 13:04

Will buy some Lektroclean and revert soonest

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