Engine idles a t 5000rom

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benjy8

New Member
Posts
74
Just changed the engine over and started it up.
Just idles at 5000rpm.
This has never happened before.
Anyone have any ideas?
 
It's a 1.8 petrol right?

Check obvious - stuck throttle butterfly flap in throttle body.
On the cam cover the two hoses the connect to the inlet manifold, they are connected correctly aren't they?
The holes in the alloy cover haven't been mod'd - on to the air cleaner side of the throttle body should be about 5mm, the other to the engine side of the throttle body is about 1mm - don't want that on any bigger.
 
htr said:
It's a 1.8 petrol right?

Check obvious - stuck throttle butterfly flap in throttle body.
On the cam cover the two hoses the connect to the inlet manifold, they are connected correctly aren't they?
The holes in the alloy cover haven't been mod'd - on to the air cleaner side of the throttle body should be about 5mm, the other to the engine side of the throttle body is about 1mm - don't want that on any bigger.
Click to expand...

I have checked all this. No issues. What seems odd was when it started it was at 1000rpm for about 1 second then just climbed to 5000rpm.
 
IACV stuck open or an air leak in the intake manifold. Or as suggested, throttle butterfly is stuck open or being held there be a tight throttle cable.
 
Nodge68 said:
IACV stuck open or an air leak in the intake manifold. Or as suggested, throttle butterfly is stuck open or being held there be a tight throttle cable.
Click to expand...

Theres definitely no are leak. I just started her up again and sat at 3000rpm. turned it off and started her aain and went up to 5000rpm. Seems likely that its the IACV. Is there any way of servicing this?
 
benjy8 said:
Just checked the IACV. Cut the air off but its still over revving?
Click to expand...

Block the throttle body with your hand. This will eliminate the throttle body completely. If it still revs, there is a leak into the manifold.
It's worth checking everything is connected to the manifold correctly. Things like the a
servo.
Are you using the manifold that came with the engine? Or the original engine's manifold.
 
Im using the original manifold. It did get left in the engine bay while the engine came out and the new one went in. Ive blocked the throttle body off and still over revs so must be a break in the manifold somewhere. Ill just go grab the gaffa tape.
 
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