rcx132
Philip
- Messages
- 2,708
- Location
- London, UK
I'm out of ideas on what to check on this car :/ Any suggestions would be very appreciated.
It was a barn find. When I got it home it wouldn't start and had no spark. I eventually found the problem was a little circuit board in the distributor which times the spark, replaced it and the car just about started.
Compression was 140psi on all cylinders except cylinder four which had 132psi (cold figures).
I rebuilt the carb and the car was now more reliably starting. Idle lumpy but when throttle applied the car is fine and does decent power. Changed the coil, spark plugs, fuel filter, HT leads. Just about passed MOT with a bit of persuasion. The car did a couple of hundred miles over the year this state.
I took it for its second MOT last week. A much older and wiser tester this time. He immediately pointed out that the engine is running badly on one cylinder. He did the emissions test, first he tested the CO which was fine. But then the HC was high. He revved it and the HC went down to normal. The MOT tester reckons this means that the carb is ok (as CO is correct) but the high HC at idle means there's unburnt fuel and is related to the bad running cylinder.
I took it home. I started pulling off the HT leads one at a time, with the engine running. Removing lead 1 or 2 would make the engine run very poorly. Removing lead 3 makes no difference. Removing lead 4 makes a small difference.
I rechecked compression. 170 psi on all cylinders (higher measurements this time as all the plugs were out so the engine was cranking very fast).
There's a decent spark at each of the spark plugs. I'm out of ideas on what to check next..
It was a barn find. When I got it home it wouldn't start and had no spark. I eventually found the problem was a little circuit board in the distributor which times the spark, replaced it and the car just about started.
Compression was 140psi on all cylinders except cylinder four which had 132psi (cold figures).
I rebuilt the carb and the car was now more reliably starting. Idle lumpy but when throttle applied the car is fine and does decent power. Changed the coil, spark plugs, fuel filter, HT leads. Just about passed MOT with a bit of persuasion. The car did a couple of hundred miles over the year this state.
I took it for its second MOT last week. A much older and wiser tester this time. He immediately pointed out that the engine is running badly on one cylinder. He did the emissions test, first he tested the CO which was fine. But then the HC was high. He revved it and the HC went down to normal. The MOT tester reckons this means that the carb is ok (as CO is correct) but the high HC at idle means there's unburnt fuel and is related to the bad running cylinder.
I took it home. I started pulling off the HT leads one at a time, with the engine running. Removing lead 1 or 2 would make the engine run very poorly. Removing lead 3 makes no difference. Removing lead 4 makes a small difference.
I rechecked compression. 170 psi on all cylinders (higher measurements this time as all the plugs were out so the engine was cranking very fast).
There's a decent spark at each of the spark plugs. I'm out of ideas on what to check next..