1994 Sentra SE , No start, cranks, have spark, gas, compression..

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240SXplan
Posts: 212
Joined: Tue Feb 17, 2004 12:10 pm
Car: 1990 240SX

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like it says.. it has everything but it would not start...

it cranks over.. and i check for spark it gave me a good shock... and I'm sure the engine is good cauz.. it ran nice..

could this problem be the O2 senor? or something else..how do i check.. it..?

please advise.. I'm stump right now..

tia,



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rogoman
Posts: 848
Joined: Fri Feb 17, 2006 5:44 pm
Car: 1991 240SX FB
2012 Altima 2.5 S

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Getting a shock is no way to test the ignition system!

Get a spare plug, pull off an ignition wire from a cylinder and plug it into the spare plug and lay the plug on top of the valve cover. Have someone try starting the car and look for a good spark; do this for every cylinder.

You may have a fuel delivery problem. The fuel filter may be plugged up or the fuel pump fuse may be blown.

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240SXplan
Posts: 212
Joined: Tue Feb 17, 2004 12:10 pm
Car: 1990 240SX

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yes.. i check the fuel it spert out really good.. after the filter..

spark.. was check buy having a spare spark plug.. laid on the cover.. i can see the spark... lighting things up...really good..

i;m stump..

I'm leaning to the o2 sensor,,.. but i don't know how to test it,..


NISTECH
Posts: 10585
Joined: Sun May 25, 2003 4:17 am

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You could have the O2 sensor safley seated and buckled in next to you in the car and it will start all day long. Albeit there would be a hell of an exhuast leak from the whole the O2 sensor once filled.

To check fuel pressure you need to be looking at a fuel gauge making sure that it is at the proper pressure for atomization and enough volume for detination. The spark you seeing "light up real good" should be blue in color not orange indicating a weak spark. What is your compression? how many psi are you seeing on your compression tester?

Post again when you have this vital info.

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240SXplan
Posts: 212
Joined: Tue Feb 17, 2004 12:10 pm
Car: 1990 240SX

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Now the the car starts a bit.. but it shows code 22.. what is that..?

NISTECH
Posts: 10585
Joined: Sun May 25, 2003 4:17 am

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There is no code 22. Your misreading the light flashes. you probably in mode 2. To put it in mode 3.

turn the screw to the line and watch the light flash it will flash both leds once puase flash both led's 2 times pause flash both leds 3 times now turn the screw back and watch the lights for codes. The first one that flashes is your 10's digit and the other is your 1's digit.

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240SXplan
Posts: 212
Joined: Tue Feb 17, 2004 12:10 pm
Car: 1990 240SX

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what happen was.. it said it is the igntion ..code 21... check harness.. but don;t know where the ignition tansitor is?

than I step on it and start pumping it for 1 minute and it starter.. than it ran fine...what do you think it was?

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rogoman
Posts: 848
Joined: Fri Feb 17, 2006 5:44 pm
Car: 1991 240SX FB
2012 Altima 2.5 S

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Looks like an intermittent condition in the ignition circuit that's posting the 21 code. Check the harness connectors and ground connections.


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