Question about 1989 Nissan Sentra 4 Door
What year is your car? Type, model........
Posted on Oct 19, 2013
Testimonial: "1989 Nissan Sentra sedan. I figured out that my firing order was off. fixed that... 1342... now I am concerned because my 1 cylinder seems to always be the culprit to any new problem. I am the third owner(the second was my mom)and before she owned it it had over heated at least once. How do I anticipate problems that may arise from this. and is it part of why my spark plugs were covered with black soot"
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Posted on Jan 02, 2017
it sounds like you have a weak spark. take the spark plug that fires good and put it on each of the other three wires, if it still fires good then the problem is your plugs...energy not coming through them. if no change then swap the wire and plug that fire good together onto another position on the cap, if it fires good in another position then its the wires. if it still doesn't change and the cap and rotor are new, i'd look at the coil.
Posted on Mar 13, 2009
SOURCE: car won't start
Stang: Nissan had a TSB on weak spark related to the Altima's and Sentra's. It had to do with water getting trapped in the spark plug tubes due to the steam hole vents in the plug wires becoming clogged and/on the wires no longer sealing well to the motor, thus allowing water to accumulate into the plug holes. This would cause a weak spark condition. You would still get an injector pulse as long as the ignition can be triggered.
As far as fuses: There is a box on the driver's side which contains fusible links and fuses. Unless you are checking for power with the ignition on, most of the circuits will be dead because they are switched circuits through the ignition switch. The headlights will be hot without the key on, as will the running lights,horn and brake lights.
However due to the fact that you have light spark and have injector pulse, would tell me that you have power to the ECM. If you want to check circuits, buy a cheap test light and follow the instructions. it is a simple diagnostic tool for checking for open circuits.
Hopeful I might have given you some direction. Good luck.
PS: if you replace plug wires, do so with a good quality wire. I have found that NGK wires and the Original equipment wires seem to be the best quality, lasting the longest. Life time warranty parts mean nothing if they fail at inconvenient times and with frequency. Many of these warranty's are gambles made by parts houses based on the fact that people loose their information, don't keep the cars and or just forgot they had the warranty and went out and replaced the parts again.
Posted on Apr 05, 2009
Is the EGR valve leaking, to check this feel the EGR valve at idle, it should not be hot, if it is the valve is leaking and should be replaced, the second common cause is intake manifold vacuum leaks, u can check this with a can of spray carburetor cleaner, if there is a leak the idle will change as u spray the area of the intake that has the leak, also look for split or loose vacuum hoses, then there is the fuel injectors, u could have one or more that are not spraying correctly from carbon or sludge on the injector tip, the dealer can run an injector flow test to determine if that is a problem, last is low cylinder compression or ignition problems, all cylinders should be within 5% of the highest reading, more than 5% and a rough "ratty" idle is the result. I am a tech of 35 years and this is the order i go in to find these types of problems.
Posted on May 02, 2009
SOURCE: Distributor wont spark
check the fuseble link.
you can measure it, and make sure the contact are clean and secured.
the other thing is the check the ignition switch, make sure you have 12v going to the switch.
check thermo switch on top of the block.
Posted on May 21, 2009
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