Sloooww starting
#1
Sloooww starting
My Maxima has to crank for about 10 seconds before it starts, every time, unless I'm starting it up again right away, then it only takes about 3 seconds of cranking.
I've recently got new spark plugs (non-platinum...), new air filter, fuel filter, and redid the fuel lines (still got gas smell though).
It cranks quickly, good starter and battery power. Always starts eventually.
The only time it has gotten better (briefly, like 1 -2 days), has been a) after I changed fuel filter and b) after I replaced some fuel injector hoses. Almost like releasing the fuel pressure somehow made it get better for a bit ...
Any ideas ??
I've recently got new spark plugs (non-platinum...), new air filter, fuel filter, and redid the fuel lines (still got gas smell though).
It cranks quickly, good starter and battery power. Always starts eventually.
The only time it has gotten better (briefly, like 1 -2 days), has been a) after I changed fuel filter and b) after I replaced some fuel injector hoses. Almost like releasing the fuel pressure somehow made it get better for a bit ...
Any ideas ??
#2
HOw old is the batt.
You need to check the voltage WHILE cranking, it should be at least 11V.
It could also be your fuel pump, can you hear it prime when you turn the ignition ON (but not cranking). The pump should run for about 2 sec.
Also you should do a fuel pressure test.
You need to check the voltage WHILE cranking, it should be at least 11V.
It could also be your fuel pump, can you hear it prime when you turn the ignition ON (but not cranking). The pump should run for about 2 sec.
Also you should do a fuel pressure test.
#3
Originally Posted by 92SE_Dave
My Maxima has to crank for about 10 seconds ...Almost like releasing the fuel pressure somehow made it get better for a bit ...
Any ideas ??
Any ideas ??
Check out also cam angle sensor. Spark wires/coilpacks?
#5
Originally Posted by bhunter
Fuel lines themselves? Corroded and crappy, might explain why new filter worked well for a while until crud clogged it too.
#6
Originally Posted by Wiking
Points to what Eric said. Smell might be the non burned fuel.
Check out also cam angle sensor. Spark wires/coilpacks?
Check out also cam angle sensor. Spark wires/coilpacks?
I've recently replaced the spark plugs (did all tune-up within 1 week), but I just used regular ones, and I noticed on the filter box for the VE it says to use platinum tipped plugs...
All of the coil pacls looked fine except for the one cracked one, which I've already replaced.
I do hear the fuel pump prime very quietly... I have suspicions about it...
But why would releasing fuel pressure make it start well ?? I mean after I replaced some fuel lines, it fired RIGHT up on the first crank, and continued for about 2 days.. then started taking longer and longer.. till now it takes 10 seconds.
#7
Originally Posted by 92SE_Dave
...But why would releasing fuel pressure make it start well ?? I mean after I replaced some fuel lines, it fired RIGHT up on the first crank, and continued for about 2 days.. then started taking longer and longer.. till now it takes 10 seconds.
--->Check out also cam angle sensor ...and its groundings plus+ all grounDings...
--->Coilpacks: measure primary & secondary windings, insulate temporarily with wrapping in cloth. And/or clean, spray with insulating lacquer. Test.
--->check out batt voltage
--------------------------------------------------------------------
"But why would releasing fuel pressure make it start well ?? "
- gas bubbles playing in the pump: cavitation. Result is intermittent loss in pumping capacity. Comes and goes without warNing. How this would be possible? ...The pump assy may have internal air leaks. (gas tank vacuum worsens this phenomena =open filler cap)
Related Q.: is the problem the same with full tank AND low fuel?
--->replace pump assy.
#8
Originally Posted by Wiking
Those two might have direct relation, indirect relation or maybe none at all. Every time hood is opened, one may touch some problematic wire...
--->Check out also cam angle sensor ...and its groundings plus+ all grounDings...
--->Coilpacks: measure primary & secondary windings, insulate temporarily with wrapping in cloth. And/or clean, spray with insulating lacquer. Test.
--->check out batt voltage
--------------------------------------------------------------------
"But why would releasing fuel pressure make it start well ?? "
- gas bubbles playing in the pump: cavitation. Result is intermittent loss in pumping capacity. Comes and goes without warNing. How this would be possible? ...The pump assy may have internal air leaks. (gas tank vacuum worsens this phenomena =open filler cap)
Related Q.: is the problem the same with full tank AND low fuel?
--->replace pump assy.
--->Check out also cam angle sensor ...and its groundings plus+ all grounDings...
--->Coilpacks: measure primary & secondary windings, insulate temporarily with wrapping in cloth. And/or clean, spray with insulating lacquer. Test.
--->check out batt voltage
--------------------------------------------------------------------
"But why would releasing fuel pressure make it start well ?? "
- gas bubbles playing in the pump: cavitation. Result is intermittent loss in pumping capacity. Comes and goes without warNing. How this would be possible? ...The pump assy may have internal air leaks. (gas tank vacuum worsens this phenomena =open filler cap)
Related Q.: is the problem the same with full tank AND low fuel?
--->replace pump assy.
#10
Originally Posted by 92SE_Dave
Could this slow starting by chance be that using regular plugs doesn't ignite cold fuel as well as the platinum plugs which are supposed to be used ??
#11
Go get yourself a fuel-pressure guage and a T-piece and plumb that into the fuel line just after the filter and drive around with that fro a few days to collect a decent experience.
I am willing to bet your fuel pressure sits way below about 40psi while the car is difficult to start - typical behavior of a worn pump.......... (or the pump not working well for whatever electrical reason)
I am willing to bet your fuel pressure sits way below about 40psi while the car is difficult to start - typical behavior of a worn pump.......... (or the pump not working well for whatever electrical reason)
#12
Originally Posted by LvR
Go get yourself a fuel-pressure guage and a T-piece and plumb that into the fuel line just after the filter and drive around with that fro a few days to collect a decent experience....
Problem could also be malfunctioning vacuum controlled pressure regulator and/or its cracked vacuum hose.
#13
Have you tried turning on the ignition switch and waiting the few seconds until the fuel pump stops running and then start the car. If the car starts normally, then its a matter of finding the pressure leak.
#14
Originally Posted by DennisMik
Have you tried turning on the ignition switch and waiting the few seconds until the fuel pump stops running and then start the car. If the car starts normally, then its a matter of finding the pressure leak.
#15
Originally Posted by Wiking
Dont believe its the platinum issue. Could still be plugs: does your plug swap time support suspicions on the new plugs? Its not the first time NGK had problems with their products... and they will not answer whatever u complain. Fairly easy to check out. I have platinums which have been working very good.
#19
Originally Posted by 92SE_Dave
I have tried that, same slow start.
No way around it - you gonna have to check actual fuel pressure
#20
Originally Posted by 92SE_Dave
I rechecked the new plugs I recently put in, and found all ok except for one plug at the front of the motor had quite a bit of grease built up (this is same one I had started a thread on before because I couldn't extract the old one...), and also the white insulation was burnt quite badly, and this after only 2000 miles... I believe the slow starting and this bad plug are related. What might cause this single plug to be bad ??
2000miles = 20% spark lost.
"I couldn't extract the old one ...bit of grease built up" ---> oil getting into cylinder: Valve oil seal and/or broken piston oil ring. Cooling ? problem. Not your starting problem.
#22
Originally Posted by LvR
That course of action will not necessarily point to fuel pressure not being the problem - the startup sequence of the fuel-pump is a "timed" event rather than an actual pressure measurement event - so if the pressure manage to reach around 40psi during the 2 seconds of startup prime, then the motor should run - if not you will continue to crank with low fuel pressure until the "engine rotating" electronics detects that fact and once again activate the fuel-pump ..................... all of which ties in with your experiences so far
No way around it - you gonna have to check actual fuel pressure
No way around it - you gonna have to check actual fuel pressure
#24
Originally Posted by 92SE_Dave
But wouldn't turning the key, then putting it again to run position cause the fuel pump to prime again ?? Thus if I do it a few times it SHOULD fix the problem if it is fuel pressure.. but I have tried this and it too doesnt not work.
I am willing to bet your fuel pressure sits way below about 40psi while the car is difficult to start - typical behavior of a worn pump.......... (or the pump not working well for whatever electrical reason)
#25
Same thing is happening to me. I just had my engine light on and the mechanic told me it was a injector. $620 later and a new injector, the Max is having a difficult time starting. Takes a long time to start. Once it is started, it doesn't have a problems, but if it sits for 10 minutes or more, it will have the same problems. Right after the fix the Max hesitated upon acceleration and <3000 RPM. Then a metal "clank" is heard every so often while driving under 30 mph. The mechanic thinks it could be another injector going wrong (another pre-existing condition prior to the first injector) and his buddy thinks it could be an ignition problems. Could my symptoms be a fuel pressure problem? HELP!!
#26
Originally Posted by maxing93black
Same thing is happening to me. I just had my engine light on and the mechanic told me it was a injector. $620 later and a new injector, the Max is having a difficult time starting. Takes a long time to start. Once it is started, it doesn't have a problems, but if it sits for 10 minutes or more, it will have the same problems. Right after the fix the Max hesitated upon acceleration and <3000 RPM. Then a metal "clank" is heard every so often while driving under 30 mph. The mechanic thinks it could be another injector going wrong (another pre-existing condition prior to the first injector) and his buddy thinks it could be an ignition problems. Could my symptoms be a fuel pressure problem? HELP!!
IMO anybody replacing an injector before measuring and confirming correct fuel pressure is not worthy of the title "mechanic"
#27
Originally Posted by 92SE_Dave
My Maxima has to crank for about 10 seconds before it starts, every time, unless I'm starting it up again right away, then it only takes about 3 seconds of cranking.
I've recently got new spark plugs (non-platinum...), new air filter, fuel filter, and redid the fuel lines (still got gas smell though).
It cranks quickly, good starter and battery power. Always starts eventually.
The only time it has gotten better (briefly, like 1 -2 days), has been a) after I changed fuel filter and b) after I replaced some fuel injector hoses. Almost like releasing the fuel pressure somehow made it get better for a bit ...
Any ideas ??
I've recently got new spark plugs (non-platinum...), new air filter, fuel filter, and redid the fuel lines (still got gas smell though).
It cranks quickly, good starter and battery power. Always starts eventually.
The only time it has gotten better (briefly, like 1 -2 days), has been a) after I changed fuel filter and b) after I replaced some fuel injector hoses. Almost like releasing the fuel pressure somehow made it get better for a bit ...
Any ideas ??
#28
Originally Posted by 5 ltr. beater
WOW!!!! I have the exact same problem on my Max. I'm just too lazy to post the problem. Hope it doesn't get worse in time.
Max is a good starter; cold or hot it starts immediately if well tuned. Age does not matter = if well tuned...
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