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Rough idle

Tiny
MBRUCE84
  • MEMBER
  • NISSAN 240SX
1989 Nissan 240SX, Rough idle. Car runs just fine when I'm at speed, but at all times when idling it's very rough. I have replaced the intank fuel pump, fuel filter, air filter, spark plugs, spark plug wires, and the oxygen sensor yet it continues to idle rough. When I got the car about a year ago it ran just fine and as far as I know the timing has not changed(or at least I don't know why it would have) I'm the only one to work on it. Please help fix my baby!
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Monday, March 6th, 2006 AT 2:08 PM

6 Replies

Tiny
FISHERMAN
  • MECHANIC
  • 938 POSTS
Did you serviced the fuel injectors?
Its that model 4 cylinders 8 spark plugs?
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Monday, March 6th, 2006 AT 3:04 PM
Tiny
MBRUCE84
  • MEMBER
  • 6 POSTS
No I have not serviced the fuel injectors. It's only 4 Cylinders and 4 spark plugs 2.4L. Is there any way to service the fuel injectors without taking it to a shop or opening up the engine? I am kind of weary about messing with the timing belt. I did a head gasket job twice on my old Pontiac Sunbird and replaced the head gasket correctly both times, but had to take it to a shop because I couldn't get the timing right even with my inductive timing light.
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Monday, March 6th, 2006 AT 5:11 PM
Tiny
FISHERMAN
  • MECHANIC
  • 938 POSTS
Im afraid the professional way to service the fuel injectors is to use the especific machine (its connected to a port on the injector manifold and pumps a strong cleaner fluid meanwille the engine its running) well you can start with a good injector cleaner on your next tank of gas, also check the intake manifold for buid-up slug and be sure you dont have any vacuum leak somewhere.

Hope this solve your problem.
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Monday, March 6th, 2006 AT 9:44 PM
Tiny
MBRUCE84
  • MEMBER
  • 6 POSTS
I have in fact tried a fuel injector cleaner quite often actually and this has done nothing. I will take your advice and see what I can do. Any advice on a decent fuel injector cleaner?
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Tuesday, March 7th, 2006 AT 9:07 AM
Tiny
SENTRAMAN
  • MEMBER
  • 13 POSTS
Did u try replacing rotor and distributor?
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Tuesday, March 7th, 2006 AT 5:03 PM
Tiny
MBRUCE84
  • MEMBER
  • 6 POSTS
I did think about it, but when I checked the timing with my inductive timing light the timing looked fine. I also opened up the distrubutor and it didn't look too worn. I went out and checked out the fuel injectors today and unknown to me they're not inside the engine so they look pretty easy to get to and off. If anyone knows how to clean the fuel injectors i.E. Water, specific cleaner, etc. PLEASE let me know.
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Tuesday, March 7th, 2006 AT 9:08 PM

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