Datsun fan Posted October 30, 2008 Report Posted October 30, 2008 Hello people ! I've Nissan A15 engine ,rebuilt with all stock parts ( Distributor , plugs , carb ...) and 78 Amps alternator . The problem appears only when starting engine which is left for at least 24 hours and the problem becomes worse if weather is "cold" (22 Celsius or lower ) . It takes about 20-25 tries to get engine started ,the cranking process seems to be quick enough and fine , there is air and fuel entring the carb and there are sparks at the plugs ends and still the engine keeps start for a very moment then stops over and over!! Anyway I checked: - Fuel lines for leak , Fuel pump , fuel filter is good and there is some fuel in it . - Carb float is set correctly and it is full of fuel, no gas or air leak , Automatic choke plate seems to close almost 100% when starting and close fine gradually ( when closed I can open it with my finger! is this normal? ) , throttle linkage cable is set fine , mixture screw is 2 turns opened and idle screw is 3/4 turn opened , Jets are : primary : 70/95 secondary :80/150 and clean , air filter and carb barrel are clean . - Plugs are NGK BP6ES and tried BP5EP , plug gap 0.7 - 0.75 ... 1.6 Mm , the plugs seem fine and color is ideal and no sign of soot or oil on them . - Original Nissan mechanical distributor with new wires , I tried to change/clean distributor/wires and to change timing , the same result !!!???? - I use correct type of engine oil -no oil or coolant consumption- I did compression test , I set OHV clearance using lashes :0.08" for intake and 0.1" for exhaust ( cold engine ) I use correct type of gas (8.6 Octane #) and the car (A/T) makes 240 Km/20l downtown . Since I don't smell gas coming out of tail pipe during starting , I think it is Carb issue and there is something needs to be set well . Anyway it is a coolant type carb , I've another carb( NIKKI ) with 6 pins connector , I think it is electrical type so should I try to install it ? I need to know the diffrence between bothe types . I appreciate any effort to solve this haunted engine . Quote
datzenmike Posted October 30, 2008 Report Posted October 30, 2008 Your carb should have a choke on it. Take the air filter off and pump the gas. The choke plate should close like this: http://i138.photobucket.com/albums/q251/datzenmike/carb720notlikethisLarge.jpg[/img]"] It should not be open like this:http://i138.photobucket.com/albums/q251/datzenmike/carb720shouldlooklikethisLarge.jpg[/img]"] Quote
Datsun fan Posted October 31, 2008 Author Report Posted October 31, 2008 I checked the plate when engine is cold and found it is closed and there is still about 2mm clearance to be closed completely , I tried to adjust the plate but it seems this little clearance is a factory design so what should I do? What about electrical choke type ( NIKKI ) carb , is it better than coolant type ( HITACHI I think ) I have ? Quote
datzenmike Posted October 31, 2008 Report Posted October 31, 2008 (edited) Nissan uses electric choke heater. Sounds like it's adjusted fine. Can you post some pictures of it? Edited October 31, 2008 by datzenmike Quote
datsunfish Posted October 31, 2008 Report Posted October 31, 2008 Gotta be the timing or firing order. Quote
Datsun fan Posted October 31, 2008 Author Report Posted October 31, 2008 I'll try to send some pics tomorrow . Quote
Cuts metal like mad Posted October 31, 2008 Report Posted October 31, 2008 have you tried pumping the gas pedal a couple times before starting it? It's not a new car... Choked or not i've always had to do this with all of my datsuns, and other than that they run and drive perfectly fine. Quote
]2eDeYe Posted October 31, 2008 Report Posted October 31, 2008 ^ Yep, standard operating procedure for old cars. Pump 3 times, start it up. Quote
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