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Idle TroubleShooting 

 

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 Post subject: Idle TroubleShooting
Posted: Sat Mar 10, 2007 8:24 pm 
Getting Side Ways
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Age: 31

Posts: 771

Joined: 20th Nov 2005

Ride: AU XR8 220 Manual

hey guys. my car has a slight idle problem. it has been there ever since i put the new motor in. the vac is also low at idle in drive and park but at cruise the vac is great. the car also seems to be using a bit more fuel than i would expect.

so far in trying to solve the problem i have:
- replaced all intake gaskets
- had the mixtures tuned
- replaced the coil and checked ignition components
- double checked valve lash and they are perfect

note the car has heavier valve springs but are just heavy duty crow replacements and is on a straight gas system. anyone have any idea as to why this might be happening. im only getting 300km max out of a tank which is less than i used to and thats 1/2 city 1/2 highway driving. i feared it may be the gas system being gunked up but im not spending anymore money or wasting anymore time without a fair idea of success so any thoughts are appreciated

cheers
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Posted: Sat Mar 10, 2007 8:49 pm 
Getting Side Ways
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Age: 38

Posts: 520

Joined: 23rd Dec 2005

Ride: EF Futura Wagon

Location: Toowoomba
QLD, Australia

I would try a dynamic compression test. That will tell you, without pulling the head if you have worn intake or exhaust seats, a intake or exhaust blockage, etc. I would also double check for any intake/vacuum leaks by spraying WD40 or the like all around.

Dynamic compression check is described here: http://www.imperialclub.com/Repair/Engine/dynamic.htm

Basically it is a normal compression test but you start the engine.

cheers
Scott

 

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If it doesn't fit, jam it. If that doesn't work use a hammer. - Engineers Motto

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Posted: Sat Mar 10, 2007 9:29 pm 
Getting Side Ways
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Age: 49

Posts: 6467

Joined: 18th Dec 2006

Ride: 93 ED sedan

Power: 161 rwkw

Location: Rockhampton
QLD, Australia

Is the gas convertor a genuine Ford unit???? If so, there are 2, 10mm headed plugs, at the bottom of the convertor, remove those and let the oil out. Then refit the plugs with a little pipe sealant..

 

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Posted: Sun Mar 11, 2007 12:31 am 
Getting Side Ways
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Age: 31

Posts: 771

Joined: 20th Nov 2005

Ride: AU XR8 220 Manual

the convertor is an Impco L convertor and it runs with an Impco 225 mixer. note system is straight gas
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Posted: Mon Mar 12, 2007 9:47 pm 
Getting Side Ways
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Age: 31

Posts: 771

Joined: 20th Nov 2005

Ride: AU XR8 220 Manual

any other ideas fellas. i will do a compression test soon but no signs of lost compression so far
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Posted: Mon Mar 12, 2007 9:53 pm 
Getting Side Ways
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Age: 38

Posts: 520

Joined: 23rd Dec 2005

Ride: EF Futura Wagon

Location: Toowoomba
QLD, Australia

The dynamic compression test can tell if you have a blocked cat, blocked intake, etc. Good to try. You could have a bad valve in number 2 intake, say that is causing erratic vacuum. Dynamic will show you this.

cheers
Scott

 

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If it doesn't fit, jam it. If that doesn't work use a hammer. - Engineers Motto

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