Quote:
Originally Posted by hillram Folks..while im rejoicing the Fiat 1100 Club-Hyderabad edition,I have certain vows with my Delight.
Post replacement of Engine head and setting all the parametres correctly,there has been misfiring happening while revving and it certainly is jerking the whole car while driving.my mechanic has been trying "Trial and Error" method to find this misfirings.HE has till now:
- Replaced the condensor
- Replaced distributor wiring
- Replaced the fuel valve in the carburattor from size 100 to 102,the later being the correct size for the Delight.
Yet after all these adjustments/replacments,the engine is misfiring when im revving.Even in stationary mode under idling condition,when i step on the accelerator pedal for revving,the engine misfires.
What could be the reason for this?Im getting a little restless with this...
Need your inputs folks. |
Please go step by step and you will surely get the solution yourself.
1.Check if the point gap is 0.40mm (Dwell angle 60 degrees) with a feeler gauge or dwell meter only. Human judgement doesn't work here.
2. Check if the timing is set to 10 degrees BTDC. This should be the first mark from the 3 marks which are very close to each other
3. Check all the spark plugs. If necessary, replace with Bosch Mico W7QBC or W175Z1. Please do not adjust the spark plug gap in any case.
4. After removing the spark plugs from the car, with just the ignition ON ask your mechanic to turn the fan by hand and check if each plug is working. You should see a bright blue coloured spark.
5.If the problem is still not solved, with the car idling and at operating temperature, carefully remove the spark plug cables one bye one.Be VERY I repeat VERY careful while doing this as these cables have nearly 20-25000 volts of potential difference which could result in a nasty shock at the least or severe fire due to the distance from the carburetor. Ones hands should be dry, non greasy. Using a cotton cloth would help. First remove the cable from cylinder one and see if the misfiring worsens, if not, reconnect the cable and proceed to cylinder no.2. If on removing the cable from a particular spark plug, the misfiring doesn't worsen, it means that particular cylinder isn't firing. Check the spark plug and then check for loss in compression with a compression gauge which may be due to a loose spark plug or other bad piston rings.
6. If all the above doesn't work, you would need to check the fuel delivery system for vacuum leaks and the particular cylinder for compression loss.
Regards,
Adheesh Parelkar
Last edited by adheesh : 17th February 2010 at 23:24.
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