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Hi Folks, My car is Toyota Corolla AE100. When A / C turns on engine is idling up normally but it cannot hold the RPM, just after idle up RPM again drops. When in traffic it is a big issue because RPM getting low and low. I have changed an ECU but it shows the same issue. Checked all the sensors related to throttle body area. Checked the A/C compressor also. Then mechanic said that the last thing that can be done is ECU remapping. Are there any other thing to check? Need your idea Thanks

Dear Experts, This is the place which I usually lookup for tips and to get trusted advices on automotive throughout the years and finally time has come for me to put a major issue which I'm facing now that requires your help greatly... I have a Toyota Sprinter Marino 1993 model 5A-FE (EFI) which failed 2 emission tests done in DriveGr**n. The attachment has the latest results. The problem is high CO levels in both idle and 2500 RPM. Car normally does around 9km/l city and I thought its normal for a manual Marino. I have done a Engine tuneup in J*kis 7 months back and they did clean the throttle body, plugs were not replaced but adjusted and they cleaned the injectors just using the carb cleaner ( didn't attached to that measuring machine and checked even thought I was charged for it it seems ) . Small water drips started to appear from the silencer n made me happy so didn't go after it. Now after like 8000kms when the emission test initially failed I showed my car to a person in Vidyala junction and he figured out that the Overflow to the petrol tank had a blockage and fixed it (some small particle was inside the metal tube near to the tank). No check engine light to show any sensor error. Also he did a self diagnose to identify if there is a sensor issue and non has problems. He checked the spark plugs and said the mixture is rich and the plugs are oki, and checked the throttle body which only had small amount of carbon. So he suggested not to do a full tuneup again. So I went for the test this Saturday and it failed with the below results for the second time. Guys, What can be the issue here. I have used octane 95, VIC air filter, mobil 40 as well. I have no option but to take this to a place in Raththanapitiya which has emission equipment and they charge 2500 just to find the fault and asked to come on a weekday which I cannot allocate due to circumstances. 1. Does this sounds as a fault in O2 sensor? 2. Do I need to replace the spark plugs? 3. Can this be a Dalco issue? Or to check the Dalco wiring and adjust Dalco? Greatly appreciate your help.

Hi All, I bought a reconditioned engine and replaced it at Sunil Motors Boralesgamuwa. After two days of the replacement, in the morning I went to the emission and it was passed. Then I waited around at home 1hr and started to go to a near by place. After around 1.5km the car was suddenly stopped. There was an AC Idle issue due to Sunil Motor mechanic adjusted wrongly. I adjusted normal idle correctly but could not adjust AC idle valve since I had no proper allen key for that. So for all earlier trips I did not switch in AC. For this small trip I had to use AC since my wife was with me in car. When idling engine is stalling since not enough air. Kind of this happened before the sudden stop. I tried several times to start but engine rpm rises comes back to zero. Forcefully I peddled accelerator and got into a nearby spaced area. While I was forcefully peddling I engine gave a huge thud noise.  Mechanic came and tried to rotate the engine. Engine locks at one point when turning. I still cannot think what happened. Because, 1) Engine was a very good one since we carefully inspected rubber hoses, sensors, coolant passages, cam shafts, even the thermostat was like a brandnew one. 2) After the replacement I drove around 50kms and nothing was wrong in the engine. If mechanic had misaligned the timing belt this could have happened sooner. Am I ryt? Anyway mechanic will start to dismantle engine on tuesday. Highly appreciate your comments.