Car keeps revvving at 5000rpm!! Help

[Rsstu21]

Basically started the car last night and boom shoots upto 5000 rpm no Mil codes and doesn't go down atal? Any tips would be helpful

 

[Bozmeister]

Sounds like a vaccum leak, check your hoses, and listen for a hissing sound near the intake mani or the throttle body. let me know your findings

 

[Crybert]

Have you taken off the top manifold recently? If it's not set correctly it'll be air getting in

 

[Rsstu21]

Believe it or not it's what I done the day before? Had to replace sparkplugs?

 

[Ol’ Tarby]

You've trapped a lead between the upper manifold and the cam cover. Or you've left off one of the vacuum hoses

 

[Crybert]

Yeah you've not sat it flush. As above something will be stopping it sitting flat

 

[Rsstu21]

Would it make the car immediately rev to 5 k and sit there perfectly?

 

[Crybert]

Yep. Mine did it too. Best to get it sorted as the lead will be getting fouled too

 

[Sunglasses_Ron]

There's also a washer/grommet that sits under the inlet manifold Isn't there?

I'm sure I left it off once when replacing the inlets and this is what happened.

 

[Ads29]

There's also a washer/grommet that sits under the inlet manifold Isn't there?

I'm sure I left it off once when replacing the inlets and this is what happened.

Yeah a big egg shaped one, sits in the underside face of the top inlet

 

[Sunglasses_Ron]

Yeah a big egg shaped one, sits in the underside face of the top inlet

Yeah that it. If that's missing then it will cause the issues described by the OP I believe

 

[Amos91]

I believe that's only on the 172.

 

[Ads29]

It will indeed on a 172, there's no breather there on a 182 is there?

 

[Rsstu21]

Thanks for the help guys! Lead was trapped. There is a egg shapped seal and a small hole and this is a 182 but all sorted now