Question about Datsun Stanza

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Datsun stanza 1800

Idle speed dropped after engine wash and now no power even after picking up idle speed to compensate.

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  • Hoosain Louw Aug 13, 2008

    Idle speed too high and needs to be adjust all the time ?

    Why is it doing that ?

    What can be wrong with timing ?

    Can it be the timing -chain ?

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Check ignition coil, they are known to short circuit after a wash.
Try starting engine at night or in the dark and look around coil and leads for hi voltage sparks.

Posted on Aug 08, 2008

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Check the normal ,warmed up idle speed, then step on the brake pedal to see how much the idle drops with the stop light load. Then turn on the A/C to see how much the idle drops.

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This sounds like the altenator belt is loose. When the altenator is under a load the magnetic field causes the altenator to require more fource to rotate. At higher engine rpms the belt can be slipping on the altenator pulley. There is one other possibility I can think of and that would be that the voltage regulator is faulty and and causing an overvoltage at higher engine speeds and therfore opening up the field circuit to prevent the altenator from over charging the battery this is a safety function of the regulator. I would check the belt first.

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Water vapor in your distributor cap will cause those conditions, especially after engine washing. Remove and dry the distributor cap and it should run fine aftrewards.

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if you washed the engine bay theres a chance you may have got water into the spark plugs or on the distrubutor, remove dizzy cap and remove water from the underside, sum crc products work well at this. usually after the engine gets hot it will evaporate the water away, I hope you don't have an exposed air filter, this could also be wet causing starvation. sum more info would be helpful

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This car has hydraulic lifters( tappets} therefore should not adjustment, you probably have a bad or weak lifter. But, in any case you have to remove the valve covers to make the adjustment. You will see the adjustable bolt on the rocker arm. rotate the engine until the valve is all the way to the top, [no tension on the valve spring] then place a feeler Gage in between the rocker arm and the valve stem, adjust the rocker arm until the feeler Gage is snug but not tight. Do this with each valve. Check the book for the correct Gage to use but I think it is a .018.

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