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Hi Friends, I'm having bit of issues when starting my car in the morning or whatever time when engine is cold. This is a Lancer CB2 with 4g15 carb engine. Have two problems actually. 1. when I crank the engine in cold it would start right away and rpm jumps to around 1300 for around 2-3 seconds and then comes back to around 300. Again the choke kicks in and rpm again goes above 1000 for a minite and again come down afterwards. Sometimes the engine stops unless I rev it for bit. RPM keeps fluctating like this until the engine gets heated up for normal operating temp. (To put it simply fast idling happens only time to time ) Once the engine heated up rpm settles around 700 and no issues afterwards. How to solve this? choke seems not working continuously. 2. Other problem is related to riding experience. I could hear engine knock when pressing on gas hard in mostly in 3rd & 4th gears. Have noticed this happens only after engine got heated up for normal operating temp and until that knocking will not occur. And I don't see any lag in pulling power nor other riding issues . What could be the reason ? Note: I'm not actually sure whether this is engine knock sound. But the sound is similar when we try to press more gas when rpm is low for that particular gear. Appreciate your valuable advices on this. Thanks.

Hi Guys, Since recently I'm facing some issues with my car when the engine heats up to its operating temperature. Car is Lancer CB2 1994 (4G15 Carb engine). when I start the car in the morning it starts up without any issue and engine RPM stays at 1000. But after some driving about 10 mins, following could be noted, 1. When I stop and try to start the engine when it is heated, it starts with difficulty and engine revs slowly around 400 - 500. (without AC). But I don't feel any low pulling power when driving. 2. When heated, it starts to emit smoke but this happens intermittently. (at cold start no smoke) I have replaced all 4 plugs recently but it didn't help. Also engine miss fires a bit in the morning but goes off when engine gets heated. what would be the reason for above? Thanks. PS: Today when I start in the morning it started to emit white smoke after being idle for about 5 mins. I reved the engine a bit and then the smoke turned blue.