Horrid FLAT SPOT between 1-2k RPM.HELP!

**Vaux-Man-G** · 26th July 2009, 21:33

Chaps,

This is an ongoing problem im trying to resolve with my dad's CDTI 150 SRI. I have repalced the EGR valve for a second hand unit which has apparently been re-worked by Vx (has a hole in the solenoid side), and I have previously cleaned the old EGR Valve and the inlet manifold and boost sensor.

The EGR valve, Boost Sensor and Swirl valve have all been repalced by Vx 2 years ago and the car is only just touching 27k from new (55/2005).

I have also checked the swirl bar and it is happily spinning all 4 injector's when rev'd.....

............the problem I am getting is a horrible horrible flat spot between 1-2k RPM. It just doesnt seem to want to shift or is very relucatant, but once im over 2k RPM, its right as rain!

I had the same'ish problem with the old EGR Valve and same with this, everything else seems in order too.....what next?

THIS ONLY happens during take off.....if I take off an rev over 2k RPM, its good and much better, but anything below and I feel a HUGE LAG!!
Its a bit

as when im at the lights, I almost get the feeling that the chap next to me in a 1 litre Micra Tempest is going embarass me, OR he thinks I want to race him.

It feels a though it will stall if it dont get some proper high rev'ing!

!

**Vaux-Man-G** · 26th July 2009, 22:46

?? ?? ??

**Celes** · 26th July 2009, 23:07

I have a similar issue with my V6 and some have suggested it could be a faulty air flow sensor...hmmm

**rob 2.2dti** · 26th July 2009, 23:39

sounds like a dirty EGR valve to me. have you cleaned it ?

**slick91** · 27th July 2009, 00:27

Originally Posted by rob 2.2dti

sounds like a dirty EGR valve to me. have you cleaned it ?

hhhmmmm .......[/quote]The EGR valve, Boost Sensor and Swirl valve have all been repalced by Vx 2 years ago and the car is only just touching 27k from new (55/2005).

think so mate.......

**Vaux-Man-G** · 27th July 2009, 08:57

Originally Posted by rob 2.2dti

sounds like a dirty EGR valve to me. have you cleaned it ?

Originally Posted by slick91

hhhmmmm .......

The EGR valve, Boost Sensor and Swirl valve have all been repalced by Vx 2 years ago and the car is only just touching 27k from new (55/2005).

think so mate.......[/quote]

Deffo not this folks....I CLEANED THE EGR valve out myself two weeks and have just replaced it for another 2nd hand unit too which is clean as a whistle too and I double cleaned it to make 100% sure!

**Big Sig** · 27th July 2009, 09:47

Variable turbo vanes stuck?

**Vaux-Man-G** · 27th July 2009, 10:53

Originally Posted by Big Sig

Variable turbo vanes stuck?

:thud: !

OK, now I am proper proper confused.

are Variable turbo vanes ??

**Big Sig** · 27th July 2009, 14:06

The turbo changes the inlet size with the variable vanes to provide constant boost over a longer rev range. They can become full of rubbish and stick in one place, therefor acting like turbos of old. Loads of lag until they spool up.

I think <- my disclaimer!

BTW, K&N forsale in the forsale section

**etholyne** · 10th August 2009, 09:21

hi mate
how you doing iv'e just got myself a 58 plate 1.8 sri and i have the same lag when from 1st to 2nd thinking of taking it back to VX to see if they can sort it out