Car cranks, but will not start

2001 INFINITI I30
167,500 MILES • 3.0L • 6 CYL • 2WD • AUTOMATIC
Avatar
GVSDAWORLD
  • MEMBER
  • 24 POSTS
My car cranks, but does not start, mainly in cold weather. The only current codes I have are: p450 and1130. It used to have in addition to this, codes p0335, p0300, and p0150. Here is a little history on what I have done recently. I changed intake manifold gaskets, spark plug gaskets, spark plugs, one ignition coil, bank 2 sensor 1 o2, starter, battery and vacuum lines. It had a really bad oil leak from intake manifold gaskets, so that is why I changed that. So all that, and again the only current codes are the p0420 and p1130. Now it takes many cranks and tries to start in the cold, and does like it wants to shut off at idle, but it keeps running. I just cannot seem to figure out what is wrong. I wonder if maybe the crank has an intermittent problem. Also, the rpm's should flutter a bit while trying to start right? Because it is not.
Dec 11, 2017 at 7:27 AM
Advertisement
Avatar
STEVE W.
  • CERTIFIED EXPERT
  • 15,113 POSTS
Reading through the descriptions for those codes and what can set them. The common item is a faulty Crank position sensor REF item. That would be the front crankshaft sensor that reads off of the crankshaft pulley next to the oil filter, and the one that the PCM uses to determine TDC.
It provides a voltage signal to the PCM every 120 degrees. Resistance test should show 470 - 570 Ohms through the coil in it. If you have a scope you can watch the signal for the spikes every 120 degrees.

Dec 14, 2017 at 7:07 PM
Avatar
GVSDAWORLD
  • MEMBER
  • 24 POSTS
Thanks man will check it I checked it two days ago, the last time it started, it had two new codes. P0430 and p0505. Drove it home, and it hadn't started since...
Dec 14, 2017 at 8:05 PM
Advertisement
Avatar
STEVE W.
  • CERTIFIED EXPERT
  • 15,113 POSTS
I would start by testing the sensor. Timing being off or altered will mean it doesn't start or may start but run crappy. It can also trigger cat codes because the PCM expects to see certain input signals to base it's results on. The P0420 and P0430 codes are related to the converter not performing, but if the PCM is getting the wrong info then all codes are suspect.
Dec 15, 2017 at 12:53 PM