Rough idle - Nissan Forum
SR20DE/DET Engines 1991-2002 Silvia

 
LinkBack Thread Tools Display Modes
post #1 of 6 Old Sep 16th, 2015, 03:29 AM Thread Starter
NissanForums Newbie
 
Joined: Sep 2015
Posts: 6
Rough idle

Hi guys I'm having a problem with my s14 sr20det. It idles at 5-600 and idles lumpy. No engine management light. Or strange engine sounds. Car is not down on power what so ever and drives perfect under acceleration of any sort. But when car is sitting at any constant speed below 120k ish it is hesitant and jerks a bit. Give it a little more gas and accelerates smoothly. Any help would be greatly appreciated. Thanks

Ryan010 is offline  
Sponsored Links
Advertisement
 
post #2 of 6 Old Sep 16th, 2015, 10:34 AM
Sup Mod keeping the peace
 
rogoman's Avatar
 
Joined: Dec 2004
Location: NJ (Philadelphia area)
Posts: 5,995
Several things to check/replace:
- Spark plugs. Use only NGK OEM plugs.
- Dirty or leaking fuel injectors. Run some good injection cleaner, like Techron or Redline SL-1, through the system; give the cleaner about a week or two to do it's job.
- Vacuum leak. To check the intake system for a vacuum leak, attach a vacuum gauge to a full vacuum source. A good place to connect to is the charcoal canister. There should be three hoses connecting the carbon canister. Two of the hoses go to a purge valve that's built into the canister. The second larger hose off the purge valve should be your vacuum line. With the engine fully warmed up, the reading at idle should be 18 - 20 InHg. At 3,000 RPM, it should be around 21 InHg. If readings are under 18 InHg, check the intake manifold nuts to make sure they are tight. The gasket may have failed; spray a water mist at the gasket to see if the gauge reading changes. Also check the intake plenum bellows at the throttle valve and at the MAF for cracks or loose clamps.
- Leaking blow-off valve. Make sure all the clamps are tight.
- Leaking EGR valve.

KA-T for life, yo!
rogoman is offline  
post #3 of 6 Old Sep 16th, 2015, 12:14 PM Thread Starter
NissanForums Newbie
 
Joined: Sep 2015
Posts: 6
Ok I'm going to chan he spark plugs and clean injectors this weekend and see. I'm quite new to turbo cars but if I had a vacume Leak would this not effect power/boost.. Thanks
Ryan010 is offline  
Sponsored Links
Advertisement
 
post #4 of 6 Old Sep 16th, 2015, 01:38 PM
Sup Mod keeping the peace
 
rogoman's Avatar
 
Joined: Dec 2004
Location: NJ (Philadelphia area)
Posts: 5,995
A vacuum leak would create a leaner mixture which might affect the idle. It's worthwhile checking it if changing plugs and cleaning injector doesn't fix the problem.

KA-T for life, yo!
rogoman is offline  
post #5 of 6 Old Sep 16th, 2015, 05:37 PM Thread Starter
NissanForums Newbie
 
Joined: Sep 2015
Posts: 6
Oh that may be the culprit because it does seem to run lean as if I hold a rev of let's say 3,000k it will make small backfires but not drop revs
Ryan010 is offline  
post #6 of 6 Old Sep 19th, 2015, 09:56 AM Thread Starter
NissanForums Newbie
 
Joined: Sep 2015
Posts: 6
Problem solved it was in fact a vacume leak thanks a million for the help
Ryan010 is offline  
Reply

  Nissan Forum > 240SX/Silvia/S12 200SX > SR20DE/DET Engines

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Nissan Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in











Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Similar Threads
Thread Thread Starter Forum Replies Last Post
rough idle help REDALERT11 SR-Series Engines (DE/VE) 11 Jul 5th, 2010 05:01 AM
Rough Idle tothemaxima L30 1998-2001 Altima 5 May 20th, 2007 11:01 PM
Rough Idle CT_Nismo J30 1989-1994 Chassis 3 Mar 5th, 2006 04:33 PM
brief rough idle? islandpsd Truck & SUV 1 Sep 17th, 2005 09:03 AM
Rough Idle minmax J30 1989-1994 Chassis 4 Jul 8th, 2005 10:28 PM

Posting Rules  
You may post new threads
You may 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 On

 
For the best viewing experience please update your browser to Google Chrome