Outer Limits 4x4 Board

Can anyone tell me what cause a flat spot when I slowly push the go pedal on my NH 3 ltr ? It seems to be worst of all before the motor really warms up which causes a non normal auto gear change.
All help appreciated.
Regards Salty.

Dead set. The last few times there has been a problem with my car, i've fixed it, and when i jump on outers of a night time there has been a thread about it. It's bloody spinning me out!

Mine was doing a similar thing (mine is manual tho) where it was almost surging, bogging down mid rev range and was worse when cold and after idling for a while. I advanced the timing a little which helped but it would ping under high load. I thought i would check the TPS (throttle pos. sensor) as the airflow meter is a karmen vortex type which never normally give problems.

Now using a multimeter, the voltage reading between pin 3 and ground should be about 0.8v at idle and 5 volt at WOT. (presuming the voltage reg in the ECU is working and sending out a 5 volt reference). Tested mine today and it was 0.8 at idle but only 3.9v at WOT. So i "advanced" the TPS until it was about 4.7v @ WOT and 1.3v at idle. Bingo!!!! problem solved. I also added a few degrees of timing again and no pinging.

Now to me this would indicate that the potentiometer in the TPS was slightly out and not giving the ECU the full 1-5v adjustment that it needs. The luxury i have tho is mine is manual and it doesn't need to be spot on for the Auto shifting. (and i'm a tight arse)

I would start by checking the voltages at the TPS and adjusting the switch with a bit of trial and error. If the engine revs smoother but the auto shift is still dodgy then it may need replacing. Its somewhere to start anyway. Good luck

check that your air pipe from air flow meter to throttle body is in good nic aswell mine had a huge flat spot and the air pipe had a tear allowing air to bypass the air flow meter.