massiveCoRbyn
ClioSport Club Member
Several
Hello guys and gals.
New to the forum and have a question. I've done some searching on this, but so far not managed to find anything that quite matches my symptoms. My '53 Clio 172 Cup seems to suffer from a rather poor idle, enough to make the car shake quite badly at times.
Generally the car drives well, starts fine, and pulls cleanly to the redline, but does seem to suffer the following:
When you start the car, the idle is ok, it sits a bit higher initially, and then drops away, as you'd expect with any car. However, once it drops, it then begins to get very lumpy. The tacho needle doesn't pick it up, but the idle is obviously very lumpy, far more so than other 172s I've seen. It doesn't cut out, or hunt, but is just very rough, like an old car with a really harsh cam in it. If you leave the car idling for any length of time, the emissions warning light will often begin to flash. After flashing for a period, it will often go out of it's own accord or, if you drive the car, it then goes out. The light never flashes or comes on when driving the car normally.
When you drive the car cold, it can also feel quite hesitant at light throttle. If you accelerate with any vigour at all, it feels flat, but I believe that's normal for these, and obviously isn't something you should do anyway. However, for example, if you are driving along in 4th at around 30, or in 5th at around 40, the car can feel like it's missing slightly or is hesitating. Once the car is warm, this is much less pronounced.
The other symptom seems to occur when in traffic at very low speeds. If you're crawling along in 1st gear, or at very low revs in 2nd, the car can feel very unhappy, and tries to bunny hop quite a lot. This might partially be down to how the car is, as I'm more used to bigger cars with bigger engines, but it does seem slightly excessive.
As I say, generally the car drives well and pulls fine, but this is a bit annoying and, with the MOT fast approaching, I don't want it to be failing on emissions.
To my knowledge, it's all standard apart from an induction kit. I've replaced the pre-cat lambda sensor, and have ordered new plugs, but thought it would be worth getting other opinions, as I've read lots about throttle cleaning, TDC sensors, timing issues and various other things, so don't want to just waste money replacing parts.
Thanks for the help.
New to the forum and have a question. I've done some searching on this, but so far not managed to find anything that quite matches my symptoms. My '53 Clio 172 Cup seems to suffer from a rather poor idle, enough to make the car shake quite badly at times.
Generally the car drives well, starts fine, and pulls cleanly to the redline, but does seem to suffer the following:
When you start the car, the idle is ok, it sits a bit higher initially, and then drops away, as you'd expect with any car. However, once it drops, it then begins to get very lumpy. The tacho needle doesn't pick it up, but the idle is obviously very lumpy, far more so than other 172s I've seen. It doesn't cut out, or hunt, but is just very rough, like an old car with a really harsh cam in it. If you leave the car idling for any length of time, the emissions warning light will often begin to flash. After flashing for a period, it will often go out of it's own accord or, if you drive the car, it then goes out. The light never flashes or comes on when driving the car normally.
When you drive the car cold, it can also feel quite hesitant at light throttle. If you accelerate with any vigour at all, it feels flat, but I believe that's normal for these, and obviously isn't something you should do anyway. However, for example, if you are driving along in 4th at around 30, or in 5th at around 40, the car can feel like it's missing slightly or is hesitating. Once the car is warm, this is much less pronounced.
The other symptom seems to occur when in traffic at very low speeds. If you're crawling along in 1st gear, or at very low revs in 2nd, the car can feel very unhappy, and tries to bunny hop quite a lot. This might partially be down to how the car is, as I'm more used to bigger cars with bigger engines, but it does seem slightly excessive.
As I say, generally the car drives well and pulls fine, but this is a bit annoying and, with the MOT fast approaching, I don't want it to be failing on emissions.
To my knowledge, it's all standard apart from an induction kit. I've replaced the pre-cat lambda sensor, and have ordered new plugs, but thought it would be worth getting other opinions, as I've read lots about throttle cleaning, TDC sensors, timing issues and various other things, so don't want to just waste money replacing parts.
Thanks for the help.
