Car reving at 3-4K whenit is supposed to be idling.

[182halfpenny]

Hi guys, just put a new engine in my car went to turn it on and it will start but won’t stop reving so have to turn it straight off again. Any ideas on where I have gone wrong ? Or what the cause is?.


Thanks
Dan


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[Sunglasses_Ron]

Could it be the gasket under the inlet manifold? I remember when I changed my inlet manifold and forgot to put the gasket in, the engine revved like f**k when it was started.

 

[Ol’ Tarby]

Air leak somewhere.
A pipe or gasket is missing inlet side

 

[bloke]

172 engine by any chance?

 

[182halfpenny]

172 engine by any chance?

Yup 172 engine into a 182


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[182halfpenny]

Air leak somewhere.
A pipe or gasket is missing inlet side

I will have a look when I next get a chance but turned it straight of before I break another engine [emoji23][emoji23]


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[bloke]

Got the 182 upper inlet on it then I'm guessing?

 

[Jon-r87]

Why a 172 engine in a 182? Are the inlet manifold really the only difference engine wise?

 

[182halfpenny]

Got the 182 upper inlet on it then I'm guessing?

Still got the 172 inlet on it?. The 182 I let wouldn’t fit ? Have I missed a trick when putting it on the 172 engine ?


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[182halfpenny]

Why a 172 engine in a 182? Are the inlet manifold really the only difference engine wise?

Yup same block different manifolds as far as I’m aware


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[182halfpenny]

The breather plate on 172 has a bit sticking up into the manifold however the 182 manifold doesn’t have that slot ? And the breather plates aren’t the same? So the 182 manifold doesn’t sit correctly on the 172 block?.


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[bloke]

as long as you've got the 172 upper on it then check it's seated properly, they can feel as though they are but will be sat high at the back, check egg seal and then everything else on the manifold.

 

[182halfpenny]

as long as you've got the 172 upper on it then check it's seated properly, they can feel as though they are but will be sat high at the back, check egg seal and then everything else on the manifold.

Okay I’ll have a look.

where does this connect up to?. I’m thinking I missed that and that could be the problem?.


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[bloke]

the elbow?

 

[182halfpenny]

the elbow?

Yeah sorry I didn’t make it clear.


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[bloke]

goes to the elbow before the throttle body but won't cause issues with idle.

 

[d19wood]

I forgot to put the block connector back on the throttle body under the induction bend and mine did something similar. Started it and jumped immediately to a steady 4000rpm if it's the fbw throttle body you might want to check it's plugged in properly.

 

[182halfpenny]

So I’m now down to 2000 rpm on idle after re sitting and tightening the bolts. Would you suggest there is still an air leak on the intake side or am I missing something??.


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