Revs Drop To 400-500 When Clutch Is Pressed In!

[RootMan]

Hey guys,

 

So today I start up my car and drive out, when i get to the roundabout i press the clutch to go from 4th to 2nd and the revs drop suddenly to just 400-500 revs. This is a far cry from the 700-800rpm the car normalls sits at in neutral. It feels like it's about to stall every time i put the clutch in. This is making everyday driving more difficult, and is really pissing me off. I thought the carby may have been clogged with shit (It's a 4A-C by the way) so i bought some fuel additive to clean it out, but to no avail. At first i thought the hot weather today may have had an effect, however i've been driving it around just in the last hour at night time and the problem still persists.

 

Does anybody have any advice as to what i should do? This is really annoying me, i like to have a near perfect running car!

 

Many thanks in advance!

 

Adam.

[oh what a nissan feeling!]

could it be the brakes that is causing the problem, not the clutch. The brake booster is hooked to the vacuume off the inlet manifold, which means it can effect your idle.

[Des]

The only way the clutch system touches the engine is threw the clutch, When your clutch pedal is out its engaged and has more load on the engine when driving so when you push the clutch in it releases that load. So i don't see how releasing load on the engine would make it die down a bit.

 

Like oh what a nissan feeling said it could be your brakes playings games on you. If you sit there in nuetral and at idle and pump the brake pedal you will notice the revs change slightly and in my KE70 it stalled sometimes. Check its your brakes and not your clutch, if its your clutch you've lost me.

 

:D

[Trev]

The only way the clutch system touches the engine is threw the clutch, When your clutch pedal is out its engaged and has more load on the engine when driving so when you push the clutch in it releases that load. So i don't see how releasing load on the engine would make it die down a bit.

Like oh what a nissan feeling said it could be your brakes playings games on you. If you sit there in nuetral and at idle and pump the brake pedal you will notice the revs change slightly and in my KE70 it stalled sometimes. Check its your brakes and not your clutch, if its your clutch you've lost me.

 

:D

 

When going from a loaded revving engine to dropping down to idle and free spinning the engine tends to choke and when not tuned properly it wont repair itself to the normal idle speed and will die down to a lower engine speed and yes a vacuum leak will encourage this drop alot more.

[camerondownunder88]

Hi,

I had this trouble about a week before I removed my 3K motor. It turned out ot be a vaccume line on the brakes was shot so the engine would about die under braking.

 

I found the fault when installing a 4K turned out to be a hose was perrished so I got new hose problem solved.

 

But try what trev said doa turn cheak vaccume of motor and it should fix the problem.

 

As the clutch unloads the motor so it odd engine dies whne clutch pushed in.

 

Cameron

[RootMan]

Hey guys,

 

thanks for the replies, i also forgot to mention that the engine sits at 400-500 revs when in neutral at a standstill, so yeah, I'm not quite sure how this new information will affect your evaluations of my problem,

 

Thanks guys ,

[Trev]

"Same as above"

 

Check for vac leaks and check to make sure you havnt got a stuffed lead or plug (check all the ignition).

[Raven]

Also increase your idle by turn the idle screw that sits next to the throttle linkage.

[Trev]

Also increase your idle by turn the idle screw that sits next to the throttle linkage.

 

I was going to mention it but you shouldnt adjust your idle without trouble shooting the problem 1st.