1994 Nissan Sentra car wony crank

JUICEMAN1342

MEMBER
1994 NISSAN SENTRA

Engine Mechanical problem
1994 Nissan Sentra 4 cyl Front Wheel Drive Manual 100k miles

well it ran really rough about 2 months ago andi was driving it and it backfired and just stopped runnin and wont crank at all it has exaust performance headers ngk iridium spark plugs a new rotary button and distributor cap I checked the fuel pump it is pushing fuel out at a good rate I checked vaccums the pluggs are firing but the engine will not start it will turn over but won start wont even act like it wants to crank I have also checked all the fuses and changed the fuel pump relay I dont know what else it could be

5 Replies

KHLOW2008

MECHANIC
41,814 POSTS

Hi juiceman1342,

Based on your info, either the sparks are too weak, (bad ignition coil), compression is bad or the injectors are not working.

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Saturday, July 12th, 2008 AT 4:03 PM

JUICEMAN1342

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So what dp o do to check the injectors ive checked the sparks it ignited fuel I squirted in the intake manifold but still wont crank up how would I also check the coil pack and another how would I make the compression better? And what do I use to check injectors

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Tuesday, July 15th, 2008 AT 2:43 PM

KHLOW2008

MECHANIC
41,814 POSTS

Hi juiceman1342,

Since the engine started when you squirt fuel into the intake then it should either be the injectors or fuel pump/pressure.

Check for power supply to injectors. To test if injectors are shorted or have open circuit, you need to test the resistance across the 2 pins.

To check if the injectors are working, turn ignition switch to ON and use a grounded test lamp to probe the wire connector on the wire that has no power supply. If it clicks, the injector is working.

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Wednesday, July 16th, 2008 AT 7:46 AM

JUICEMAN1342

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3 POSTS

It did ignite the fuel it just didnt crank it shot a flame out the intake manifold so I know the plugs are firing but the motor wont run it self I guess I didnt say it right the last time I asked and what could cause it to do that and not fire only other thing is that the computer got it shut down

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Friday, July 18th, 2008 AT 8:57 AM

KHLOW2008

MECHANIC
41,814 POSTS

Hi juiceman1342,

So it is a fuel problem?

To check injectors you need to test the resistance across the terminals first.

Check for power supply to the socket and you cn test the injectors by applying current intermittently to check if it clicks.