Guests - Please post questions here » Will not rev above 4k

#1 by Tribal ( Guest ) , Fri Jan 08, 2016 7:36 pm

Hi forum, just waiting on my application to be approved, but already seeking advice.
As stated in title our 2007 4works has develoved a drop in performance and yet NO EML or faults codes.
In 3rd gear its even worse, struggling to rev to 3.7K and then dies and picks up again at 3.5k, so upshift is then required.
I have freed off the waste gate, as this caused a similar problem last year, although on that occassion we had EML, which subsequently cleared once waste gate was freed, and full power/performance was restored.
Idea's anyone.
Regards Rich

#2 by 4life-extreme , Fri Jan 08, 2016 7:39 pm

well i wouldnt do that to often best to keep it below 3k Rich

#3 by ronniecabers , Fri Jan 08, 2016 7:40 pm

Don't get me wrong , but why are you trying to rev it so high?
3000Rpm is ample for these 2 ton trucks....

#4 by 4life-extreme , Fri Jan 08, 2016 7:42 pm

are we assuming its a new shape (pram)curved bed, as this is right on the change over year from classic shape ?

#5 by ronniecabers , Fri Jan 08, 2016 7:43 pm

Still wouldn't want to rev it that high!

#6 by ronniecabers , Fri Jan 08, 2016 7:44 pm

I think your right though Dave , as think all the really late classics were Trojans

#7 by Nick , Fri Jan 08, 2016 7:44 pm

New shapes will rev way past 4K, without problems.

#8 by ronniecabers , Fri Jan 08, 2016 7:45 pm

Any suggestions then Nick ... blocked EGR valve ?

#9 by Nick , Fri Jan 08, 2016 7:48 pm

Could be fuel related, fuel filter? when was it last changed, or SCV may be on its way out

#10 by Tribal ( Guest ) , Sat Jan 09, 2016 10:58 am

Thanks guys, I was starting to think fuel starvation myself.
To clarify we DON'T regulary rev it that high, but in a situation when we needed power, it was NOT there, so I did an experiment.
Last night it would not go passed 3.5k in 3rd and behaves like it dies when you hit that point, so to clarify it doesn't just stop revving, it dies back to a lower point then picks up again.
Is the fuel filter easily accessible as I have no idea when it was last changed unless its part of a service which was done in Nov.
Cheers Rich

#11 by Tribal ( Guest ) , Sat Jan 09, 2016 11:20 am

Yes it is the new shape, with a few personal additions :-)

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Will not rev above 4k

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RE: Will not rev above 4k