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hiltadam
New User
May 28, 2012, 2:45 PM
Post #1 of 3
(1803 views)
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I have been working on a 95 Maxima. Found out one cylinder wasn't firing....swapped ignition coil from firing cylinder to non..no change....swapped fuel injector from firing cylinder to non....cylinders flooded from with gas ( fuel injector o ring was missing). Car wouldn't even crank then....just a slight turn and clunk...took starter off next day and sparked it on the engine by touching it (negative batt. was connected) Had it tested and It was good.........Next day cleared out fuel in cylinders...replaced fuel injector on non firing cylinder and repaired o ring on other...car will crank but no fire.....Sprayed starer fluid into intake , nothing. Took spark plug off and grounded....no spark or just a brief second of tiny yellow spark (not blue)....god I can already imagine the feed back on this........anyways any ideas would help... Thinking crankshaft pos. sensor or a relay? The thing is the car started up and ran it was just idling rough and taking off rough at low speeds.....only until I started TINKERING WITH AND did the above did it stop starting or refuse to run....Really helped there....but would really like some good advice on this one ........thanks Got the car with 220.000 miles rebuilt engine and transmission.......
1995
NISSAN
MAXIMA
3.0 V6
200000
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Hammer Time
Ultimate Carjunky
/ Moderator
May 28, 2012, 2:56 PM
Post #2 of 3
(1797 views)
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You need to do a little more accurate testing.
Every engine requires spark, fuel and compression to run. That's what we have to look for.
These are the basics that need to be tested and will give us the info required to isolate a cause.
1) Test for spark at the plug end of the wire using a spark tester. If none found, check for power supply on the + terminal of the coil with the key on.
2) Test for injector pulse using a small bulb called a noid light. If none found, check for power supply at one side of the injector with the key on.
3) Use a fuel pressure gauge to test for correct fuel pressure, also noticing if the pressure holds when key is shut off.
4) If all of these things check good, then you would need to do a complete compression test.
Once you have determined which of these functions has dropped out,
you will know which system is having the problem.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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