2002 Nissan Sentra dies often

Tiny
KIMANDGAYLE
  • MEMBER
  • 2002 NISSAN SENTRA
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 113,000 MILES
My car dies as if someone turned the key off then back on again. Problem occurs at idle, highway speed, but does not usually die completely. Not a slow die or lack of power, just off then back on. Sometime one can drive 30 miles without a problem, then suddenly starts bucking (as it dies, then back on) with a steady pedal or on cruise control. Coils are on the plugs, fuel injected, any other questions, feel free to email. Hope you can help.
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Tuesday, January 20th, 2009 AT 8:44 PM

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Tiny
KEVIN12881
  • MEMBER
If you are up on routine maintenance, it could be the fuel pump relay. Does it act like it is starving for gas? When the relay gets hot it stays open/closed.I forget
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Tuesday, January 20th, 2009 AT 8:49 PM
Tiny
KIMANDGAYLE
  • MEMBER
Gas pressure seems good, if it were the fuel, I do not think it would suddenly die, keep running, run for 30 or so miles without a problem, but I will try anything. Where is the relay?
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Tuesday, January 20th, 2009 AT 8:57 PM
Tiny
OBXAUTOMEDIC
  • EXPERT
Hello,

One question for now.

Is your check engine light on? If so go by your local auto zone or similar and have them pull codes for you they will do it for free.

Post codes here in forum.

.
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Tuesday, January 20th, 2009 AT 8:57 PM
Tiny
KIMANDGAYLE
  • MEMBER
No codes, no check engine light on.
Hello,

One question for now.

Is your check engine light on? If so go by your local auto zone or similar and have them pull codes for you they will do it for free.

Post codes here in forum.

.[/Quote:f24644f759]
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Tuesday, January 20th, 2009 AT 8:58 PM
Tiny
OBXAUTOMEDIC
  • EXPERT
The fuel pump relay is located behind the driver kick panel. I don't believe the relay is going to be the problem. My experience is that in most cases when the relay is going bad, when it get hot it will open the circuit cutting off power and will not work properly till it cools down most of the time about 5 min.

Not to doubt you, but did you try having the codes pulled. Cause it sounds like to me that it is possibly a sensor or eletrical problem.

It could be the fuel pump but never in my 20+ year have I every had a fuel pump cause the symptom you have.

.
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Tuesday, January 20th, 2009 AT 9:17 PM
Tiny
KIMANDGAYLE
  • MEMBER
I have access to a scanner and have had it on there. No codes are present. I was told a possible crank or camshaft sensor. Do you know how to check them? I am leaning toward one of these being my problem, but I am just drawing straws.
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Tuesday, January 20th, 2009 AT 10:35 PM
Tiny
KEVIN12881
  • MEMBER
Obxautomedicis right, the relay would take some time to cool. When mine went out is was to the clock- 45 minutes of driving, die, wait ten to drive ten. But I had no check engine light, and with an idle control sensor, cam sensor, crank sensor, or any other---you should have a light. But cars never listen the the word should. It may be a wire, or connection somewhere that is messing up. S there any more to the patterns you described? Does it act worse on bumpy roads, cold days, r something?
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Wednesday, January 21st, 2009 AT 5:36 AM
Tiny
KIMANDGAYLE
  • MEMBER
Not any worse on bumpy roads, cold days. Very puzzling to me. I worked in a auto repair shop for 13 years, (still do electrical and mechanic work, but industrial) this has got me baffled. It has gotten consistently worse, starts fine, runs good and bad, just drops off like before, no consistency to the problem, except that it has me pulling out what little hair I have left.
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Wednesday, January 21st, 2009 AT 6:18 PM
Tiny
KEVIN12881
  • MEMBER
A haynes manual will tell you how to check the camshft sensor, I can tell you what mine says if you want but it may differ to your car. The crankshaft sensor has to be checked by the dealer, again this is going of gm cars and not nissan
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Wednesday, January 21st, 2009 AT 6:36 PM
Tiny
OBXAUTOMEDIC
  • EXPERT
Ok, lets go at this from the fuel system side since it usually doesn't produce DTC's.

You said the fuel pressure seemed ok. Are you able to check the fuel pressure.

Pressure on NON California 1.8L cars is.

At Idle with out vacuum should be 43 psi

At Idle with vacuum should be 34 psi

California Cars 1.8L and 2.5L

At Idle with Vacuum should be 51 psi

at Idle with out vacuum = No manufacture Info available.

Post findings

.
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Wednesday, January 21st, 2009 AT 7:30 PM

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