car just cranks, does not start, details inside!!!!! - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

dragneon · 02-01-2010, 09:12 AM

hello all. i am new here but not new to cars at all. i bought my 1989 240sx from a friend with the engine torn out and apart. it started off having no electrical power at all <no lights, HVAC, radio, etc> after the engine was rebuilt and reinstalled. we later found that the 75amp alternator fuse had popped. removed and replaced the alternator fuse, great. car had all electrical accessories, started and ran ok for a while, then dies. now i did have a code 12, MAF circuit. i checked all wires to pcm, completely tore down harness and found nothing, all wires have continuity. what the shop manual says is that terminal C, white wire, should have voltage, but there is none. however, if i supply ignition voltage to the white wire, the car starts and runs, just horribly, emmitting alot of black smoke and poor idle quality<very rich>. if disconnected, the car idles smoothes out, but the car dies. i have changed MAFs, same.

is this a common issue some of you have?

i checked a running 240SX and the white wire does not have voltage with ignition turned on. i am stumped.

please help

dragneon · 02-01-2010, 05:44 PM

well, i got later today and tried to restart the car, without forcing power to the maf white wire. this time, i turned the distributor housing ass far right as it could before pegging the bolt, ran for about 2 seconds, dies.

damn, checked for codes, just code 55.

please help, i cant find any resolve

bl3ujay07 · 02-01-2010, 10:54 PM

^^^Why would you do that? You are messing up your ignition timing moving your distributor one way or the other. Get a timing gun and make sure your timing is right.

Either that, or sounds like your not getting enough fuel or so.

If its too rich, you can try unpluggin egi pump and try starting to see if it catches.

dragneon · 02-02-2010, 08:42 AM

NOPE, found it. i just said fuck it and went with my gut and bought a brand new MAF, previously installed one was used, fixed.

damn i wish i didnt doubt myself so much

02-01-2010, 09:12 AM	#1
dragneon Join Date: Dec 2009 Location: stockton,ca Age: 40 Posts: 17 Trader Rating: (0) Feedback Score: 0 reviews	car just cranks, does not start, details inside!!!!! hello all. i am new here but not new to cars at all. i bought my 1989 240sx from a friend with the engine torn out and apart. it started off having no electrical power at all <no lights, HVAC, radio, etc> after the engine was rebuilt and reinstalled. we later found that the 75amp alternator fuse had popped. removed and replaced the alternator fuse, great. car had all electrical accessories, started and ran ok for a while, then dies. now i did have a code 12, MAF circuit. i checked all wires to pcm, completely tore down harness and found nothing, all wires have continuity. what the shop manual says is that terminal C, white wire, should have voltage, but there is none. however, if i supply ignition voltage to the white wire, the car starts and runs, just horribly, emmitting alot of black smoke and poor idle quality<very rich>. if disconnected, the car idles smoothes out, but the car dies. i have changed MAFs, same. is this a common issue some of you have? i checked a running 240SX and the white wire does not have voltage with ignition turned on. i am stumped. please help

02-01-2010, 05:44 PM	#2
dragneon Join Date: Dec 2009 Location: stockton,ca Age: 40 Posts: 17 Trader Rating: (0) Feedback Score: 0 reviews	well, i got later today and tried to restart the car, without forcing power to the maf white wire. this time, i turned the distributor housing ass far right as it could before pegging the bolt, ran for about 2 seconds, dies. damn, checked for codes, just code 55. please help, i cant find any resolve

02-01-2010, 10:54 PM	#3
bl3ujay07 Zilvia Addict Join Date: Feb 2008 Location: norcal(209) and socal(805) Posts: 691 Trader Rating: (6) Feedback Score: 6 reviews	^^^Why would you do that? You are messing up your ignition timing moving your distributor one way or the other. Get a timing gun and make sure your timing is right. Either that, or sounds like your not getting enough fuel or so. If its too rich, you can try unpluggin egi pump and try starting to see if it catches.

02-02-2010, 08:42 AM	#4
dragneon Join Date: Dec 2009 Location: stockton,ca Age: 40 Posts: 17 Trader Rating: (0) Feedback Score: 0 reviews	NOPE, found it. i just said fuck it and went with my gut and bought a brand new MAF, previously installed one was used, fixed. damn i wish i didnt doubt myself so much