Revs not dropping when changing gear

**oblark** · Sunday 24th June 2012, 10:28

Hi, I`ve had this problem for a while now and it`s now getting on my nerves. When I change gear the revs "hang" at what they where when I changed gear. The revs drop after about 2-3 seconds if you hold the clutch down. I`ve had this problem on the old engine as well, So I`ve checked for air leaks all ok, cleaned the idle control valve and fitted a new inlet manifold gasket.

Could it be down to the fact I`m running blue injectors and it`s over fueling ??

Any ideas ???

**dalhousie2008** · Sunday 24th June 2012, 10:38

Blues fuel the same as white on the same pressure.

It does sound like an air leak or such

**dalhousie2008** · Sunday 24th June 2012, 10:39

You can try my ecu again to rule that out if you like later.

**oblark** · Sunday 24th June 2012, 11:53

Originally Posted by dalhousie2008

You can try my ecu again to rule that out if you like later.

It does it with the RICA 304 and the HLM 304 so I dont think it`s an ECU problem.

**theflyingbrick** · Sunday 24th June 2012, 12:04

i dont know if its coinsedence but mine used to that and got it worse and worse to point when i shut off the car would accelerate randomly,trust me its a scary thing when your slowing for traffic!!! anyway i done the usual icv,pipe work,and checking for leaks but it turns out it was the clutch!! i cant explain how or why but i had a new clutch fitted and it stopped??? it needed a new one anyway so i had it done and when i did hey presto.

**deathrider311271** · Sunday 24th June 2012, 12:05

have you cleaned your throttle body?

**oblark** · Sunday 24th June 2012, 12:13

Originally Posted by deathrider311271

have you cleaned your throttle body?

The TB was cleaned when it was fitted.

**Shadow** · Sunday 24th June 2012, 13:42

im sure i read somewhere that the manual ecu is supposed to hold the rev's between gear changes to help smooth gear change's and if you put an auto ecu in a manual the rev drop as soon at you let off the pedal.

**t5 stealth** · Sunday 24th June 2012, 14:21

sounds like air leak,
the pipe under the inlet manifold,on the left as you look at it,tucked between the stat and manifold,

**cherry1809** · Sunday 24th June 2012, 14:31

Mine used to do that. I can't pin point what it was though as when I was trying to find my misfire issue I cleaned EVERYTHING with carb cleaner and it stopped it almost. Just does it when cold now.

**Wally Dog** · Monday 25th June 2012, 23:32

Mine does the same, hangs at revs for a couple of seconds before dropping. Volvo told me to clean the throttle, sticky throttle. Not so sure though.

**oblark** · Monday 25th June 2012, 23:38

Originally Posted by Wally Dog

Mine does the same, hangs at revs for a couple of seconds before dropping. Volvo told me to clean the throttle, sticky throttle. Not so sure though.

When I fitted my 3 inch TB it was cleaned, opened and shut ok. still trying to find what the problem is.

**james** · Tuesday 26th June 2012, 07:54

i've had this for a while and it turned out to be the large pcv pipe had split/snapped inside of the protective padding @ the pct endrendering it vertually impossible to find. good old gaffer tape is keeping it going i have a new pcv system and 3" throttle body to fit am waiting to do at same time when i can figure out how i'm going to route the icv. hope this helps

**claymore** · Tuesday 26th June 2012, 08:34

Just unplug the idle controle valve

**glock19** · Tuesday 26th June 2012, 09:34

Originally Posted by claymore

Just unplug the idle controle valve

U Serious ?

**claymore** · Tuesday 26th June 2012, 13:37

Originally Posted by glock19

U Serious ?

Yep, the ecu will learn within about 20 miles

**oblark** · Tuesday 26th June 2012, 16:49

How can you tell if the idle control valve is faulty ?

**M-R-P** · Tuesday 26th June 2012, 17:04

'cos your revs hang for a while when you change gear

Sorry mate, I couldn't help myself

**oblark** · Tuesday 26th June 2012, 17:36

Originally Posted by martinrpeachey

'cos your revs hang for a while when you change gear

Sorry mate, I couldn't help myself

hahahahaha

**theflyingbrick** · Tuesday 26th June 2012, 19:04

take off the idle control valve and shake it you should hear similar to an aerosol can with the ball inside!! if its not rattling then unleash a can of carb spray into the little §§§§§§ and shake it again you should hear the free moving donk donk donk donk if not keep doing it,and if all that fails then replace with new lol hope this helps mate...ignore my clutch comment that was completely different problem lmao i was having a blonde moment when i posted that!!!