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Author Topic: Rpm increase  (Read 464 times)

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gazzap

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Rpm increase
« on: 02 June 2018, 12:11:36 »

1 of the many problems my poor omega is suffering with, if im driving and i put my clutch in, the rpm increases by a 1000rpm, and wont drop down for ages making gear changes lurchy and embbarasing, anyone else suffer with this? I've read up its a (feature of vauxhall) but that wouldn't make any sense!  :(
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TD

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Re: Rpm increase
« Reply #1 on: 02 June 2018, 16:53:22 »

Did you change the air filter when you serviced it?
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gazzap

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Re: Rpm increase
« Reply #2 on: 02 June 2018, 18:56:13 »

Yeah everything was changed as it had been sitting a long time :-\
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Doctor Gollum

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Re: Rpm increase
« Reply #3 on: 02 June 2018, 19:29:31 »

You are lifting off ::)

Something fouling the pedal?

Have you removed and cleaned the throttle body?
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gazzap

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Re: Rpm increase
« Reply #4 on: 02 June 2018, 19:44:57 »

You are lifting off ::)

Something fouling the pedal?

Have you removed and cleaned the throttle body?

Yeah i can lift off the accelerator, leave it for a about 5 seconds then go into the clutch, and it still shoots up a 1000rpm  :o nothing fouling the pedal and throttle bodes were cleaned after thinking that might be the problem, but still occurring nice and strong  :-\
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Chazza12

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Re: Rpm increase
« Reply #5 on: 02 June 2018, 23:44:18 »

probably a vacuum leak. check the vacuum lines. or the maf sensor needs cleaning. if it was dirty though the filter (on the top). Maf cleaning can get at any car parts shop.
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Andy A

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Re: Rpm increase
« Reply #6 on: 05 June 2018, 14:16:07 »

1 of the many problems my poor omega is suffering with, if im driving and i put my clutch in, the rpm increases by a 1000rpm, and wont drop down for ages making gear changes lurchy and embbarasing, anyone else suffer with this? I've read up its a (feature of vauxhall) but that wouldn't make any sense!  :(

Is it only when the engine is cold?
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gazzap

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Re: Rpm increase
« Reply #7 on: 05 June 2018, 14:26:11 »

probably a vacuum leak. check the vacuum lines. or the maf sensor needs cleaning. if it was dirty though the filter (on the top). Maf cleaning can get at any car parts shop.

Checked all the vacuum lines but will have to give the maf a clean and see if it that helps  :y
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gazzap

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Re: Rpm increase
« Reply #8 on: 05 June 2018, 14:27:01 »

1 of the many problems my poor omega is suffering with, if im driving and i put my clutch in, the rpm increases by a 1000rpm, and wont drop down for ages making gear changes lurchy and embbarasing, anyone else suffer with this? I've read up its a (feature of vauxhall) but that wouldn't make any sense!  :(

Is it only when the engine is cold?

Hot or cold buddy  :-\
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Andy A

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Re: Rpm increase
« Reply #9 on: 05 June 2018, 14:47:24 »

Strange. I got the same problem when the rpm hangs around 2000 for the first 1/2 mile of driving and then it drops to around 1000rpm this is normal when engine is cold before warming up. I've had this for well over a year I think it is without getting to the bottom of it. I also drive a manual and its a right pain. Never used to do it.

Hope you sort it out.
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Doctor Gollum

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Re: Rpm increase
« Reply #10 on: 05 June 2018, 16:06:11 »

Strange. I got the same problem when the rpm hangs around 2000 for the first 1/2 mile of driving and then it drops to around 1000rpm this is normal when engine is cold before warming up. I've had this for well over a year I think it is without getting to the bottom of it. I also drive a manual and its a right pain. Never used to do it.

Hope you sort it out.
Normal for the four pots :y It's an emissions thing to warm the cat... Kinda like an auto choke. Blipping the throttle gently usually knocks it down to normal, even when stone cold :y
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Kevin Wood

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Re: Rpm increase
« Reply #11 on: 05 June 2018, 16:34:55 »

In have seenthis sort of behaviour before on a 2.6. It turns out that the MAF sensor was the problem in that instance, but that doesn't mean it will be this time. It would be good to get some live data if you have a suitable code reader. In particular, the MAF and fuel trim values when it's fully warmed up and idling normally, if possible.

Cleaning MAF sensors doesn't generally help, and often knackers them completely.
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TD

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Re: Rpm increase
« Reply #12 on: 05 June 2018, 16:56:43 »

Yeah everything was changed as it had been sitting a long time :-\


It maybe because the old air filter was clogged up  :-\

I changed the air filter on mine....as it hadn't been changed for about 60k miles....the engines revs went up, presumably as it wasn't used to getting more air into the intake....it took it about a week for the revs to settle back down to normal......
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gazzap

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Re: Rpm increase
« Reply #13 on: 06 June 2018, 09:03:40 »

It has had a live data read while driving, but intake was reading perfect, the guy couldn't fault it, but we was looking for something else and not the rpm fault, may have to go back for a live feed and see if we can dictate why its behaving like that, its been 2 months the car has been driven but still doing it, anything to do with the clutch atall do you reakon?
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Andy A

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Re: Rpm increase
« Reply #14 on: 06 June 2018, 09:18:09 »

No. the clutch is not the fault. It wouldn't raise the rpm. Not as far as I know.
« Last Edit: 06 June 2018, 09:19:43 by Andy A »
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dave the builder

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Re: Rpm increase
« Reply #15 on: 06 June 2018, 09:21:51 »

cruise control actuator or kick down switch fault ?
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gazzap

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Re: Rpm increase
« Reply #16 on: 06 June 2018, 09:28:30 »

No. the clutch is not the fault. It wouldn't raise the rpm. Not as far as I know.

Ah glad i can rule that one out then ha
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gazzap

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Re: Rpm increase
« Reply #17 on: 06 June 2018, 09:29:11 »

cruise control actuator or kick down switch fault ?

Doesn't have cruise control and its manual mate
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dave the builder

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Re: Rpm increase
« Reply #18 on: 06 June 2018, 09:45:05 »

evap purge valve not shutting ,pipework or carbon canister sucking  :-\
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Fuse 19

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Re: Rpm increase
« Reply #19 on: 06 June 2018, 09:45:20 »

cruise control actuator or kick down switch fault ?

Cruise control is a function of the engine ECU and the electronic throttle (drive by wire) on the 2.6  :y (hence cruise is just a software setting in the ECU and does not need an actuator)
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Fuse 19

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Re: Rpm increase
« Reply #20 on: 06 June 2018, 09:48:41 »

On the original fault, check the throttle body carefully.

I have seen it where the throttle body stop has been adjusted to mask a stalling issue (usually down to an air leak or cruded up throttles), consequently the DBW control cant close them enough when idling.

Easy to check, adjust the setting until the throttle butterflies can be felt to stick and then wind the screw in slightly so they don't, lock off with the locking nut.
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Doctor Gollum

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Re: Rpm increase
« Reply #21 on: 06 June 2018, 14:28:43 »

It has had a live data read while driving, but intake was reading perfect, the guy couldn't fault it, but we was looking for something else and not the rpm fault, may have to go back for a live feed and see if we can dictate why its behaving like that, its been 2 months the car has been driven but still doing it, anything to do with the clutch atall do you reakon?
Only if you are pissed ::)

It's all down to the ecu... Swapping the ecu temp sensor for a new one might help.
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