I have a 2008 Maxima 3.5 that won't crank.

Question

2004-2008 Nissan Maxima

The sixth generation Maxima, code-named A34, was only sold in the United States, Canada and Mexico. It was introduced in production form as a 2004 model at the 2003 North American International Auto Show.

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Eric @eric1991phx

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crwdns2931729:0crwdne2931729:0: Yan 9, 2023

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I have a 2008 Maxima 3.5 that won't crank.

I just got the car last week and they had almost no power at all, for example if I would hold the gas pedal down a quarter of the way it had more power than all the way down. When I shut it off it took a lot of effort to turn back on or I would have to get a jump start to turn it back on. I thought it would be my crankshaft positioning sensor but I just got a new one from the junkyard and it's still not working. Somebody please help me this is my only source of transportation.

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If the engine runs, it's not likely to be a crank sensor problem. A blocked (disintegrating internally) catalytic converter (or several) can choke off exhaust flow as the equivalent of engine constipation. A simple test would be removing the upstream O2 sensor(s) on the exhaust manifold for an alternate exhaust path. If the engine starts up (loud) and a brief drive around the block reveals renewed power, the catcon(s) are damaged. Another issue may be a worn out fuel pump requiring testing with a fuel pressure gauge connected to a fuel rail test valve. You'll need to know fuel pressure specs with either ignition on (immediately) or with engine idling).

crwdns2934271:0Yan 19, 2023crwdnd2934271:0 F Dryer crwdne2934271:0

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If the engine runs, it's not likely to be a crank sensor problem. A blocked (disintegrating internally) catalytic converter (or several) can choke off exhaust flow as the equivalent of engine constipation. A simple test would be removing the upstream O2 sensor(s) on the exhaust manifold for an alternate exhaust path. If the engine starts up (loud) and a brief drive around the block reveals renewed power, the catcon(s) are damaged. Another issue may be a worn out fuel pump requiring testing with a fuel pressure gauge connected to a fuel rail test valve. You'll need to know fuel pressure specs with either ignition on (immediately) or with engine idling). — F Dryer