Go Back   Maxima Forums > Maxima Discussions > 4th Generation Maxima (1995-1999)
Sign in using an external account
Register Forgot Password?
Search

4th Generation Maxima (1995-1999) Visit the 4th Generation forum to ask specific questions or find out more about the 4th Generation Maxima.

Welcome to Maxima.org!
Welcome to Maxima.org,

You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, at no cost, you will have access to start new topics, reply to conversations, privately message other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, so please join Maxima.org today!


Reply
 
 
 
 
Thread Tools Search this Thread Display Modes
Old 03-15-2009, 10:23 PM   #1
Supporting Maxima.org Member

 
Join Date: Aug 2000
Location: Plano, TX
iTrader: (1)
Posts: 2,365
Points: 13,804, Level: 76
Points: 13,804, Level: 76 Points: 13,804, Level: 76 Points: 13,804, Level: 76
Activity: 2.1%
Activity: 2.1% Activity: 2.1% Activity: 2.1%

Worth a check: Vacuum Leaks / Engine Idling Problems

Recently I was having problems with my '99 SE that were baffling me. The car would run fine at speed, but was having a very rough idle. The symptoms continued to get worse until eventually the car would almost always die when idling. I checked all the usual culprits such as plugs, fuel filter, EGR cleaning, vacuum leaks, etc. but I continued to have the problem. Eventually while digging through old threads here I came across someone who mentioned they had an issue with a gasket.

I wasn't excited about having to pull the intake manifold, but eventually I needed uninstall my MEVI anyway (for sale if you're interested ) so I went ahead and took the plunge. It turns out that my PCV valve got clogged and the intake manifold was sucked in thereby creating a HUGE vacuum leak. I've never heard of this before, so I wanted to make a separate post for those who may encounter the issue in the future. The gasket isn't that expensive, and the manifold R&R isn't even that bad, but I never would have thought to check for such a thing.

If you are having idle problems and hear a vacuum leak but can't seem to trace it, try spraying some WD40 or Throttle body cleaner onto your intake manifold. If everything is sealed correctly the fluid will run down and pool near the gasket at which point you can wipe it off. However, if you have the same issue that I did then the fluid will be sucked into the manifold along with all of the unmetered air, hence the idle problems. You can see how mangle the gasket was between the fifth and sixth runner in the photo below. This occurred WITH the manifold installed and bolted down, so I'm really surprised the gasket was able to move so much.
Click the image to open in full size.

I did run a high pressure fuel pump for about 60k, so I'm sure that didn't help the clogging of my PCV valve. I wouldn't expect this to be a regular occurrence even on mildly modified cars, but for those running high pressure fuel pumps and/or nitrous/forced induction with variable intake manifolds keep this in mind.
-hype
__________________
for the uneducated, when they engage in argument about anything give no thought to the truth about the subject of discussion but are only eager that those present will accept the position they have set forth-Plato
xHypex is offline   Reply With Quote
Old 03-18-2009, 05:00 PM   #2
Newbie - Just Registered

 
Join Date: Jul 2007
iTrader: (0)
Posts: 7
Points: 3,693, Level: 38
Points: 3,693, Level: 38 Points: 3,693, Level: 38 Points: 3,693, Level: 38
Activity: 0%
Activity: 0% Activity: 0% Activity: 0%
so tried to see if there was a leak, sprayed WD-40 and then water. didn't affect the engine at all. sprayed it around the #6 cylinder. not sure if i should still try and get a new gasket. and if it was a small leak, maybe it wouldn't be affected by the water spray.

i am getting a rough idle as well as code 0306 (misfire #6). my original problem is sputtering and "engine hiccups" when cruising 60-70 km/h.

Last edited by pleckaitis; 03-18-2009 at 05:17 PM..
pleckaitis is offline   Reply With Quote
Old 03-18-2009, 06:58 PM   #3
Supporting Maxima.org Member

 
Join Date: Aug 2000
Location: Plano, TX
iTrader: (1)
Posts: 2,365
Points: 13,804, Level: 76
Points: 13,804, Level: 76 Points: 13,804, Level: 76 Points: 13,804, Level: 76
Activity: 2.1%
Activity: 2.1% Activity: 2.1% Activity: 2.1%

Quote:
Originally Posted by pleckaitis View Post
so tried to see if there was a leak, sprayed WD-40 and then water. didn't affect the engine at all. sprayed it around the #6 cylinder. not sure if i should still try and get a new gasket. and if it was a small leak, maybe it wouldn't be affected by the water spray.

i am getting a rough idle as well as code 0306 (misfire #6). my original problem is sputtering and "engine hiccups" when cruising 60-70 km/h.
When you're quoting codes you mean P0306 right (6 long blinks, 3 short blinks)? I got P0306 "Cylinder #6 Misfire", and after doing some searching here that's how I figured out to do the WD40 trick. I could definitely hear a vacuum leak, and I tried replacing lines and such to no avail. If your gasket was leaking you would hear the leak for sure, and your car would idle terribly because of all the unmetered air that is getting to the engine.

I did have hesitation while accelerating on the highway as well, but the problem was most notable at idle.
-hype
__________________
for the uneducated, when they engage in argument about anything give no thought to the truth about the subject of discussion but are only eager that those present will accept the position they have set forth-Plato
xHypex is offline   Reply With Quote
Old 03-18-2009, 07:29 PM   #4
Newbie - Just Registered

 
Join Date: Jul 2007
iTrader: (0)
Posts: 7
Points: 3,693, Level: 38
Points: 3,693, Level: 38 Points: 3,693, Level: 38 Points: 3,693, Level: 38
Activity: 0%
Activity: 0% Activity: 0% Activity: 0%
so now im not sure where to go now. not really sure what else i can do.
tried coils, injectors, swapping them. it didn't follow. i just keep getting #6 misfire.
i heard wiring harness, could be faulty. but i didnt think that would cause misfires.
im lost...
pleckaitis is offline   Reply With Quote
Old 03-18-2009, 07:32 PM   #5
The Dirty Pearl

 
pmohr's Avatar
 
Join Date: Jul 2005
Location: Clinton, TN
iTrader: (26)
Posts: 14,313
Points: 22,907, Level: 93
Points: 22,907, Level: 93 Points: 22,907, Level: 93 Points: 22,907, Level: 93
Activity: 0%
Activity: 0% Activity: 0% Activity: 0%

Quote:
Originally Posted by pleckaitis View Post
so now im not sure where to go now. not really sure what else i can do.
tried coils, injectors, swapping them. it didn't follow. i just keep getting #6 misfire.
i heard wiring harness, could be faulty. but i didnt think that would cause misfires.
im lost...
It could very well cause misfires, yes. So have you not checked the harness yet?
__________________
A32 CEL Decoder | FSMs | Howto Videos
pmohr is offline   Reply With Quote
Old 03-18-2009, 08:46 PM   #6
Newbie - Just Registered

 
Join Date: Jul 2007
iTrader: (0)
Posts: 7
Points: 3,693, Level: 38
Points: 3,693, Level: 38 Points: 3,693, Level: 38 Points: 3,693, Level: 38
Activity: 0%
Activity: 0% Activity: 0% Activity: 0%
to be honest pmohr, im not even close to guys in car knowledge. i wouldnt even know where to start to see if that was the problem. i would just have to ask my mechanic.
pleckaitis is offline   Reply With Quote
Old 03-18-2009, 08:46 PM
MaximaOrg
Nissan Maxima




Paid Advertisement
 
 
 
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are Off


 




All times are GMT -7. The time now is 01:20 AM.


Maxima.org Forums Home Here you can view your subscribed threads, work with private messages and edit your profile and preferences Frequently Asked Questions on the Forums Search Find other members Registration is free! Support Maxima.org! Receive perks and benefits by donating to Maxima.org Questions? Comments?  Suggestions? Contact Us! Visit our Sponsors View and submit Maxima events Log Out of Maxima.org
Emails Backup