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I've a '93 carburettored Pride.
I was doing a grass autotest yesterday here in the Uk (they're different to yours, being shorter and more fiddly - usually done in first and reverse only) when the power dropped off. We've had no rain for weeks (difficult to believe in the UK I know) so the ground's rock hard and the old car was taking quite a pounding.
It's always revved very freely, I've seen over 7K on the tacho. It suddenly wouldn't go above 6K. It'll go to 4K quite well, but then slowly rise to 6K where it 'tops out', this is foot to the floor in first!
My first thought was I must have clobbered the exhaust and squashed it, but it's fine and not showing any signs of damage. It's quite new from the cat back and still got paint on it and very solid.
It drove home but lacked the 'punch' it's always had.
It's not misfiring. I've pulled the plugs and they look fine. It had a new cambelt less than 5K miles ago. There's no slack in the throttle cable. Everything appears to be well apart from this lack of 'go'.
I've peered down the carburettor throat. The first throttle butterfly is working fine, but when you operate the throttle cable further (I can feel what seems to be the second choke) the second butterfly doesn't move. Is this one operated directly, or is it indirect operation by vacuum or other nefarious means?
The only other symptons are the exhaust note may be more muted (I may be imagining this) and when I pull the EGR pipe off the air filter there seems to be more exhaust coming out of there than may be healthy. I'm thinking possible collapsed cat. Is there any simple way of checking this?
I'd welcome any other checks I can do and suggestions for for what the problem might be.
The missus drove it around town this morning and didn't notice any difference, but she's pretty conservative in her driving style!
I was doing a grass autotest yesterday here in the Uk (they're different to yours, being shorter and more fiddly - usually done in first and reverse only) when the power dropped off. We've had no rain for weeks (difficult to believe in the UK I know) so the ground's rock hard and the old car was taking quite a pounding.
It's always revved very freely, I've seen over 7K on the tacho. It suddenly wouldn't go above 6K. It'll go to 4K quite well, but then slowly rise to 6K where it 'tops out', this is foot to the floor in first!
My first thought was I must have clobbered the exhaust and squashed it, but it's fine and not showing any signs of damage. It's quite new from the cat back and still got paint on it and very solid.
It drove home but lacked the 'punch' it's always had.
It's not misfiring. I've pulled the plugs and they look fine. It had a new cambelt less than 5K miles ago. There's no slack in the throttle cable. Everything appears to be well apart from this lack of 'go'.
I've peered down the carburettor throat. The first throttle butterfly is working fine, but when you operate the throttle cable further (I can feel what seems to be the second choke) the second butterfly doesn't move. Is this one operated directly, or is it indirect operation by vacuum or other nefarious means?
The only other symptons are the exhaust note may be more muted (I may be imagining this) and when I pull the EGR pipe off the air filter there seems to be more exhaust coming out of there than may be healthy. I'm thinking possible collapsed cat. Is there any simple way of checking this?
I'd welcome any other checks I can do and suggestions for for what the problem might be.
The missus drove it around town this morning and didn't notice any difference, but she's pretty conservative in her driving style!
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