Fuel, Cranking, Backfiring, but No coil spark??
#1
Fuel, Cranking, Backfiring, but No coil spark??
Hey guys. Im in dying need of help. My car has been parked in my garage for about 2-3 weeks now. I guess what first started it was i had a remote start installed that was improperly installed which i think caused something to short?
Drove the car home then went to start it up and leave and it would crank and backfire through the intake and sometimes the exhaust but would not turn over. So far ive checked almost all relays, fuses, ingition harness, battery, starter, and coils. Basically what I've come down to is that everything is working except the coils wont spark. I tested 3 of them by seeing if they would arm from a screwdriver to the engine block and did get anything. The weird thing is that the coil harnesses are getting the proper voltage.
The only thing i havent checked is the ECU. Ive replaced both crankshaft position sensors, the camshaft position sensor, a new ingition harness, removed the remote start, reset ecu, and replaced the Condenser. Also did voltage checks on all starter wires. Is it possible that when the remote start was activated it fire the second ignition and it worked the last time I got it started to drive home and when I went to start it again it couldnt handle it?
Is it possible to only fry a part of the ecu? I can still pull codes and reset it. Everything works in the car, lights, stereo, a/c, etc. Only other weird thing is it gets alot of gas when its cranking but that may just be me thinking its a lot becuase it not firing.
Can anyone throw out some recommendations or suggestions on what to do? Im going to order another ECU to test and if that does the trick. If not im going to either part it out or take it to the Nissan Stealership.
Thanks everyone,
Sean
Drove the car home then went to start it up and leave and it would crank and backfire through the intake and sometimes the exhaust but would not turn over. So far ive checked almost all relays, fuses, ingition harness, battery, starter, and coils. Basically what I've come down to is that everything is working except the coils wont spark. I tested 3 of them by seeing if they would arm from a screwdriver to the engine block and did get anything. The weird thing is that the coil harnesses are getting the proper voltage.
The only thing i havent checked is the ECU. Ive replaced both crankshaft position sensors, the camshaft position sensor, a new ingition harness, removed the remote start, reset ecu, and replaced the Condenser. Also did voltage checks on all starter wires. Is it possible that when the remote start was activated it fire the second ignition and it worked the last time I got it started to drive home and when I went to start it again it couldnt handle it?
Is it possible to only fry a part of the ecu? I can still pull codes and reset it. Everything works in the car, lights, stereo, a/c, etc. Only other weird thing is it gets alot of gas when its cranking but that may just be me thinking its a lot becuase it not firing.
Can anyone throw out some recommendations or suggestions on what to do? Im going to order another ECU to test and if that does the trick. If not im going to either part it out or take it to the Nissan Stealership.
Thanks everyone,
Sean
#3
Originally Posted by scubasteve
if the coil harnesses are getting the right voltage but nothing from the coils, you need coils.
Would the ECU be dead if i can still pull codes? And if the coils were shot would it throw a code?
Is there anyway I could test the coil itself without having to replace them?
#5
might have fried the computer or faulty crank sensor wiring. best bet is to pick up a used ecu, swap it in and if it dont work take it back. i know a place that sells them refurbished with a 1 yr warranty for 295.00 if interested.
#7
did you try put starting it? dunno if thats a good idea though...if im ever in orlando im might stop by if you need to try an ECU but mines auto so it will be a little shakey. what did nissan say?
#8
Originally Posted by nishfish871
did you try put starting it? dunno if thats a good idea though...if im ever in orlando im might stop by if you need to try an ECU but mines auto so it will be a little shakey. what did nissan say?
As for the car backfiring, i cant imagine why the coils wouldnt arc when i tested them.
#10
Simple test..
Spark plug tester. Crank the car see if you have spark on each cylinder. If you do then you know its not a coil pack problem, harness problem and maybe not even a ecu related issuse.
As the car is running, run a small bottle of propane gas through the intake. If the car smoothes out you have a gas related problem.
If thats the case I would throw a scanner on the car drive it around the block if possible see if you can get any pending codes. If something comes up as a misfire on a spec cylinder, I would test that injector. If you smell a lot of gas its probably an injector. I would also check the fuel pressure regulator. Try to unplug the vac hose while the car is running see if you notice a change. It should run richer.
Do you have a mevi? I would open the top cover and check on those butterfly bolts.
It sucks that our cars ignition timing is mainly done by the ecu and also its friends called the crank and cam sensors. Anything can be possible. A bad gap in the flywheel or cam gears can set timing off and worse the car won't run. Let me know.
Spark plug tester. Crank the car see if you have spark on each cylinder. If you do then you know its not a coil pack problem, harness problem and maybe not even a ecu related issuse.
As the car is running, run a small bottle of propane gas through the intake. If the car smoothes out you have a gas related problem.
If thats the case I would throw a scanner on the car drive it around the block if possible see if you can get any pending codes. If something comes up as a misfire on a spec cylinder, I would test that injector. If you smell a lot of gas its probably an injector. I would also check the fuel pressure regulator. Try to unplug the vac hose while the car is running see if you notice a change. It should run richer.
Do you have a mevi? I would open the top cover and check on those butterfly bolts.
It sucks that our cars ignition timing is mainly done by the ecu and also its friends called the crank and cam sensors. Anything can be possible. A bad gap in the flywheel or cam gears can set timing off and worse the car won't run. Let me know.
#11
Originally Posted by SMX95
Simple test..
Spark plug tester. Crank the car see if you have spark on each cylinder. If you do then you know its not a coil pack problem, harness problem and maybe not even a ecu related issuse.
As the car is running, run a small bottle of propane gas through the intake. If the car smoothes out you have a gas related problem.
If thats the case I would throw a scanner on the car drive it around the block if possible see if you can get any pending codes. If something comes up as a misfire on a spec cylinder, I would test that injector. If you smell a lot of gas its probably an injector. I would also check the fuel pressure regulator. Try to unplug the vac hose while the car is running see if you notice a change. It should run richer.
Do you have a mevi? I would open the top cover and check on those butterfly bolts.
It sucks that our cars ignition timing is mainly done by the ecu and also its friends called the crank and cam sensors. Anything can be possible. A bad gap in the flywheel or cam gears can set timing off and worse the car won't run. Let me know.
Spark plug tester. Crank the car see if you have spark on each cylinder. If you do then you know its not a coil pack problem, harness problem and maybe not even a ecu related issuse.
As the car is running, run a small bottle of propane gas through the intake. If the car smoothes out you have a gas related problem.
If thats the case I would throw a scanner on the car drive it around the block if possible see if you can get any pending codes. If something comes up as a misfire on a spec cylinder, I would test that injector. If you smell a lot of gas its probably an injector. I would also check the fuel pressure regulator. Try to unplug the vac hose while the car is running see if you notice a change. It should run richer.
Do you have a mevi? I would open the top cover and check on those butterfly bolts.
It sucks that our cars ignition timing is mainly done by the ecu and also its friends called the crank and cam sensors. Anything can be possible. A bad gap in the flywheel or cam gears can set timing off and worse the car won't run. Let me know.
Originally Posted by C MAX
did you try grounding the starter
#13
Originally Posted by nishfish871
i might be able to do it friday or thursday sometime. i dont have class friday and one class thrusday. let me know.
#14
Originally Posted by sean05
These tests would be great if the car would run. But its not moving at the moment. I will try the spark plug testing tho.
No I didnt. What would this do and why would I need to do it. I didnt even think of this.
No I didnt. What would this do and why would I need to do it. I didnt even think of this.
#15
Thread
Thread Starter
Forum
Replies
Last Post
jmlee44
4th Generation Maxima (1995-1999)
8
10-02-2022 02:13 PM
TKHanson
5th Generation Maxima (2000-2003)
6
11-24-2018 01:39 AM
My Coffee
New Member Introductions
15
06-06-2017 02:01 PM