High rev

[mccannjg]

Advice please, I have a 850 T5 which when in idle is always running around 1300 on the rev counter. It seems to rev high when changing gear too [especially when cold].

Also when coming off the gas to slow down it does a delayed judder.
Hope it makes sense what i have described?

Any advice would be great,
Cheers Guys!


ps, have i missed something but what happened to this site -
http://volvo-t5.co.uk/

[Bracer]

You either have a major air leak which I suspect or your EGR Valve needs cleaning.

To help me pin point the prob can you tell me how far you boost gauge goes into the White section on the gauge ? It should go 2/3 to 3/4

Steve

[siamblue]

Might be something like a throttle cable adjusted too much or it is fryed and sticking a bit.Try and the former and adjust it down a little.

[mccannjg]

2/3 to 3/4?
Hmmm...off the top of my head i think it just about goes half way.
I'll check it out later and let yuu know properly, thanx.

By the way what is the fix then for a air leak, or is it a case of finding where the leak is?

Thanx again.

[Andrew]

2/3 to 3/4?
Hmmm...off the top of my head i think it just about goes half way.
I'll check it out later and let yuu know properly, thanx.

By the way what is the fix then for a air leak, or is it a case of finding where the leak is?

Thanx again.

Air leak once found just means replacing the appropriate hose or elbow joint. If your only going half way up i.e. where the black / white join there is certainly something wrong. Air Leak is most likely but could be turbo or other more expensive problems.

[Bracer]

2/3 to 3/4?
Hmmm...off the top of my head i think it just about goes half way.
I'll check it out later and let yuu know properly, thanx.

By the way what is the fix then for a air leak, or is it a case of finding where the leak is?

Thanx again.

For the air leak take a look Here at the thread I've already prepaired

[mccannjg]

Sorry misunderstood, i thought you meant 2/3 into the white area of the boost guage! Excuse, i am thick.

Ok i've attached a couple of pics to show you.
Excuse the quality i just did it quickly using my phone.

Pics 4 and 7 Show when engine is in idle [rev counter has been going upto 1500]
Pics 8 and 9 is when i booted it.

Also what is a EGR Valve?

I really don't know much about engines at all.

Thanks alot for your help, it is appreciated!

[Andrew]

It's looking fine for a normal car I'd say.

[Wobbly Dave]

IMHO I'd say you idle is a little high. The boost looks slightly down (but then that depends what gear you were in). I would expect it to come 1/2 way across the white - maybe even 2/3rds depending on load. It does point towards an air leak I'd say and/or a sticky throttle. But I really would have to see the car to be certain and hook up a calibrated boost gauge.

Where are you in the world?

[Andrew]

Aye probably best for a few folks to take a look - it's hard to diagnose such things without knowing if you had your foot planted etc for the high boost, what gear, what idle etc

Edit your profile - put in your location.

[Bracer]

AIR LEAK ALERT

[Justin]

You may have a knackered purge valve which is clipped onto the right hand side of the rad, but it looks more like an air leak, you will also be loosing power from it

[Bracer]

Sorry misunderstood, i thought you meant 2/3 into the white area of the boost guage! Excuse, i am thick.

Ok i've attached a couple of pics to show you.
Excuse the quality i just did it quickly using my phone.

Pics 4 and 7 Show when engine is in idle [rev counter has been going upto 1500]
Pics 8 and 9 is when i booted it.

Also what is a EGR Valve?

I really don't know much about engines at all.

Thanks alot for your help, it is appreciated!

Exhaust Gas Recirculation Valve

See how to clean it Here

[bay13]

I'd suspect the idle air motor is the problem with the high RPM at idle. What I'd do is clean the throttle body and the idle air motor and see if that doesn't settle your RPM down a bit at idle.

The EGR on your car is only engaged when you have load on the car and are cruising down the road. If the EGR was open it would actually cause the engine to buckle or die, cause of the exaust gas being injected into the manifold at idle. If the EGR was clogged, nothing would happen except your Check engine light would come on, cause when the computer tells the EGR to open, the fuel trims are monitored and if there is no change the ECU knows somethings up.

[Bracer]

I'd suspect the idle air motor is the problem with the high RPM at idle. What I'd do is clean the throttle body and the idle air motor and see if that doesn't settle your RPM down a bit at idle.

The EGR on your car is only engaged when you have load on the car and are cruising down the road. If the EGR was open it would actually cause the engine to buckle or die, cause of the exaust gas being injected into the manifold at idle. If the EGR was clogged, nothing would happen except your Check engine light would come on, cause when the computer tells the EGR to open, the fuel trims are monitored and if there is no change the ECU knows somethings up.

Welcome aboard Sir.

I fell humbled in your presence.

Another great asset to are ever growing site, thank you for joining.

Steve

[craig]

this all sounds familiar except the idle on my t5 is perfect and the boost gauge goes 3/4 into the white but when i change gear the revs dont drop off if i hold the clutch down they hold at the point of where i depress the clutch for about 5 seconds and then drop back down. but my mates t5 does exactly the same so is this normal?

[mccannjg]

funny you should say that but the revs on mine either stay or go up when i change gear too!?!??!

Doesn't sound normal tho does it? Suppose i should get that checked out too!