Revs dying immediately after startup

[caister]

As soon as the engine has started the revs die off unless I blip the throttle. Then the car is fine and idles/runs as it should.

Any ideas what could be causing this?

 

[172cupwizard]

Mine does it sometimes, mainly when its been stood overnight and its humid!

 

[caister]

It doesn't do it in the mornings but late afternoon when i'm leaving from work.

 

[greg182]

clean the throttle bodie its free and a easy 1st step!

 

[172cupwizard]

It doesn't do it in the mornings but late afternoon when i'm leaving from work.

Have you changed plugs or HT leads since you had car? and what fuel you running

 

[caister]

The plugs, leads and coilpack were changed by the previous owner about 30k ago. I'm using shell optimax. Its only started doing it over the last couple of weeks. Ive tried everything obvious like cleaning the TB etc.

 

[Chrisjk]

Mine does this also majority of the time.

 

[vincent]

Sounds like the Idle control valve to me

 

[kevin.s]

mine did this this morning, had to hold the key for about 4-5 seconds before it fired. but if i blip the throttle then its fine. just the standard lumpyness

 

[caister]

Mine fires up after about a second then requires a blip and then its fine! Only does it when the outside air is warm. A bit of a mystery really!

If it was the idle control valve I would of thought it would have issues idling?

 

[OLR]

mine is the same, been appning since we had this hummid weather, start it up revs to about 1500 then drops and cuts out.

I just hold it at 1500 for 1-2 seconds ands its fine then

 

[caister]

Maybe its just the humidity then.

 

[vincent]

Mine fires up after about a second then requires a blip and then its fine! Only does it when the outside air is warm. A bit of a mystery really!

If it was the idle control valve I would of thought it would have issues idling?

I suggested that because it seems like it's just Ph1's that suffer from this, well looking at this thread that is

 

[Xanda73]

My ph1 does this also, but only when cold. It will also cut out on idle with full lock and looking at the service history, it's had these problems for a long time, nobody seemingly able to get to the bottom of it.

 

[DanS]

Mine does sort of the oposite to this, it turns over fine and starts after a few cranks but the revs start off really low, as if its about to stall, then a few seconds later seem to pick up to normal!
I had a look at my spark plugs at the weekend and they def need replacing, they are covered in a white build up!

 

[caister]

Mine does sort of the oposite to this, it turns over fine and starts after a few cranks but the revs start off really low, as if its about to stall, then a few seconds later seem to pick up to normal!
I had a look at my spark plugs at the weekend and they def need replacing, they are covered in a white build up!

They should be covered is a white/red build up. Unless its excessive.

 

[sideways danny]

try priming the fuel pump twice before you crank over the engine

 

[caister]

This has been solved by changing the water temperature sensor. The gauge started fluctuating loads the other day and since changing it the sensor the car goes straight to idle after being started.

 

[Andyman]

Sorry to crash the thread but going back further up to post number 5. Can HT leads cause fluctuations in revs or idle?


Mine miss-fired due to the leads failing, was running ok idle / rev wise, changed the HT's to some second hand ones i had sitting about now the car plumits revs when i change gear to nearly stalling point regardless of in gear speed.

Car's needing mapped tho but was running ok 10 - 30 miles after the instalation of the cams. Not sure if its the leads or just needs mapped. Was ok prior to miss-firing so wondered if HT's can cause idle problems?