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Automatic idle module isn't working. Isolating the knock is going to be more difficult. There are many reasons an engine knock develops. It will take a good mechanic to tell for sure.
which engine, there are many opted engine, name one.
did you say the engine lacks power? under what conditions.
Parked
moving.
hills,
wideopen throttle weak?
what?
btw : no idle works right if the engine runs bad.
lean fuel the ISC cant control idle ,
same for misifire.
idle is the last thing to work right in EFI.
is engine misfiring, and if so did it before the tune up or after./?
There is a good possibility that your hard starting and poor idle can be contributed Valvetotheto the Cold Air Idle Control valve. This valve regulates bypass air and will cause idle and start problems.. It is very important that the temperature sending unit is functioning correctly because it tells the computer what stage of operation the engine is in, controlling all the computer functions and operation of said. Good Luck, Ned
There is no reason for the idle to take 10-15 seconds to slow to normal. perhaps you have a vacume leak. check all your seal and gaskets between the engine and the carb.also when it is running spray gummout spray or equivilent around the gasket edges between the engine and the carb, if the idle increases when you spray then you have a vacume leak. (intake leak). It may be that this is causing it to be hard to start when it is hot.(not getting enough fuel)
Check the air cleaner and muffler for plugging first. Turn both jet needles CW to stops (lightly), then back out each CCW 1-1/2 turns. Turn the idle speed screw CW about 1/2 turn. This is a basic setting and the engine should start and run. Allow to warm up, then pull the throttle full on and adjust the H needle CW til the engine speeds up somewhat, but is still 4-stroking. Correct setting is when the engine 4-strokes, but immediately 2-strokes when cutting. Release the throttle and allow to idle. Turn the L needle CW until the engine runs fairly well, but still allows the engine to 'follow the throttle'. Adjust idle speed screw so that the chain stops moving, but still allows the engine to keep running. Hope this helps!
Hello,
The car may be hard to start because it may need a normal tune-up. If the spark plugs are pretty used, they will slowly stop burning as much fuel because the spark slowly gets lesser and lesser. On a cold day the fuel is harder to ignite with a small amount of spark.
Normal idle when its cold means that your cars idle is probably too high. If you lower the idle, the choke on a cold day will keep the idle a little higher until the motor warms and then it will kick back off. If the idle is too high, it will run very rich, smothering itself with fuel, and causing the idle to stay low. When the car warms, its creating better spark when its warm, and with the idle being too high its running at a fast idle.
The car wont start sometimes can be the cause of a few things. If the ground is bad on the fuel pump, it wont make a good connection sometimes for when you turn the key on, the fuel pump dont pump the fuel to the engine. Another one can be that your accessory switch can be loose going to the fuel pump. I think its your ground though. Good luck! Hope this helps.
Have a nice day.
-Steve
make sure thortle body is clean, it also sounds like the idle air control valve is not working may need replacing, this is what hold the engine at idle,mostly when first started ,but also at other times when requested by computer to raise or lower the idle, hope this helps good luck.
I would recommend that you clean the intake throttle valve and idle speed control valve with carb cleaner, start the engine and hole a high idle while you spray (it will try to stall) the intake, use most of the can, then let the engine stall, disconnect the battery and wait one hour, reconnect battery and, start the engine and throttle it up good a couple of times to blow the carbon and sludge out, the idle should improve, if not you may have a hard part issue, but that is rare.
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