Phillips_91
Member
Registered: 20th Jan 10
Location: Blackpool. Drives: Sapphire Black Mk4 Astra 1.8
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Hi guys, just done a conversion to x16xe and everynow and again completely randomly the idle will shoot up to 3/4K and hold, mainly seems to do it when it gets hot, any ideas?
I've had a suggestion of possibly the cts sensor but wondered if anyone could either confirm this or give me other options, much appreciated,
Danny 
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grubz172
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Registered: 14th Jan 10
Location: Manchester Drives: Vehicles
User status: Offline
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cts or rocker cover gasket could be leaking or another gasket around the intake
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Phillips_91
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Registered: 20th Jan 10
Location: Blackpool. Drives: Sapphire Black Mk4 Astra 1.8
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rocker cover gasket?  didnt think that would cause it to rev up?
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Mike
Organiser: North West and North Wales
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Registered: 20th May 06
Location: nr. Skipton, North Yorkshire
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Cts is possible, judging by other Vaux engines they're only usually a few quid too so that'd probably be the easiest start point
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Phillips_91
Member
Registered: 20th Jan 10
Location: Blackpool. Drives: Sapphire Black Mk4 Astra 1.8
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i've got a nearly brand new one on my old engine so will just pinch it off that, just rang up a local mobile diagnostics aswell as i've flashed eml and i've getting 15 - 20 codes before i got bored, so he's coming out on tuesday to clear the codes and see if anything else comes up, £25 so cant really complain  but in the meantime i will swap that cts over
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grubz172
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Registered: 14th Jan 10
Location: Manchester Drives: Vehicles
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if the rocker gasket has gone it sucks air in causing it to rev up, any gasket around the top end for that matter. like i say ide say cts but check gaskets etc
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AlexW
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Registered: 25th Oct 08
Location: Essex
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^LMFAO rocker cover gasket.... actually LOL.
Chris F's used to sit at 5k idle after being running for 2mins, Changing the battery fixed it lol
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grubz172
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Registered: 14th Jan 10
Location: Manchester Drives: Vehicles
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whats funny??? the rocker cover gasket can cause an engine to rev up ? oh i forgot you the expert on everything soz mate. my car was revving to 3000 rpm changed icv then tps and still did it. turned out the rocker gasker was leaking. changed that and its been right sinse but aw06 knows it all though
[Edited on 24-02-2011 by grubz172]
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Gary
Premium Member
Registered: 22nd Nov 06
Location: West Yorkshire
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Wrong tbh.
Open the oil cap, does it mess with idle? No.
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grubz172
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Registered: 14th Jan 10
Location: Manchester Drives: Vehicles
User status: Offline
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take the vacuum of the rocker cover on the x16xe does it mess with idle? yes .. fixed my revving on mt car anyway so clearly worked
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Gary
Premium Member
Registered: 22nd Nov 06
Location: West Yorkshire
User status: Offline
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Vac on the rocker?
Not up on the smallblocks but the rocker dnt create any vac, it'll be a breather.
20xes have a breather on the rocker and many have fucked hoses and run perfectly fine.
Still not convinced.
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AlexW
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Registered: 25th Oct 08
Location: Essex
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Its a load of crap, Taking the oil cap off would cause it to sit at 5000rpm then.
If you remove that breather it wouldn't do that much.
I know engines and I know baby xe's 
[Edited on 24-02-2011 by AW06]
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Phillips_91
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Registered: 20th Jan 10
Location: Blackpool. Drives: Sapphire Black Mk4 Astra 1.8
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well the lad thats helping me sort it has found a hole in the clean air pipe right before the throttle body  so need a new one again
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Gary
Premium Member
Registered: 22nd Nov 06
Location: West Yorkshire
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Insulation tape  
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Gary
Premium Member
Registered: 22nd Nov 06
Location: West Yorkshire
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quote:
Originally posted by AW06
Its a load of crap, Taking the oil cap off would cause it to sit at 5000rpm then.
If you remove that breather it wouldn't do that much.
I know engines and I know baby xe's
[Edited on 24-02-2011 by AW06]
Indeed. I ran my van without an oil cap for a few days by accident once. It was fine apart from oil splatter everywhere!
You could run an engine with nonrixker and it would work fine for a while
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Gary
Premium Member
Registered: 22nd Nov 06
Location: West Yorkshire
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No rocker*
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ryanlockie
Member
Registered: 25th May 10
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quote:
Originally posted by Gary
Insulation tape
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AlexW
Member
Registered: 25th Oct 08
Location: Essex
User status: Offline
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quote:
Originally posted by Phillips_91
well the lad thats helping me sort it has found a hole in the clean air pipe right before the throttle body so need a new one again
The long black pipe to the air filter? Wouldn't cause it to rev. Would have to be after the TB to effect it. Unless you mean the short rubber connecting pipe, then ignore me
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Phillips_91
Member
Registered: 20th Jan 10
Location: Blackpool. Drives: Sapphire Black Mk4 Astra 1.8
User status: Offline
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well theres a slight blow in the lower inlet manifold gasket that we've just found but cant get it off as i've not got a deep 13mm socket to get one nut off, and where the oil breather goes into the long black pipe as AW06 describes was split so i've just plastic welded it together again for temporary, insulation tape didnt work, and put some sealent around inlet till i bring my deep socket home, fingers crossed it runs for now
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