Having problems with rough idle after start up than my check engine light comes on. It use to idle down a the check engine light would go off but now it stays on. Changed out my spark plugs with the original nissan plugs. Problem is still there. I taking it to the dealer on Sat. Any suggestions before I spend my hard earned money

 

clean throttle body

clean Idle Air Control Valve

check vacuum hoses

 

What Red92MaxSE said. I had a lumpy idle with occasional surges and stalls. I replaced my air filter and plugs and it got better, but still not fixed. Then I changed out all my vacuum lines and check valves and it was almost perfect. Just mildly lumpy, no more surging or stallling. Then I finally thought to clean out my throttle body and bam! that fixed it.

 

Replaced plugs, rotor and cap found out my injectors are bad code 51 on the scanner that explains my poor gas mileage also.

 

How do you clean the throttle body

 

My 93 SE with the VE30DE idles rough and seems to me a little low, about 550- 650 RPM in gear and occasionally surges to 1500 or so, also in park it will sometimes idle around 1500 as well, normal is 800-900. Any Ideas? It also occasionally stalls.

 

where are the vacumm hoses located anyone have a pic?

 

Once again I fixed the problem bad injectors runs great now. Thanks for your advice. Yes I did check all the hoses thet where okay.

 

Hey, i have a little tip that might help you out. Obviously the first thing you want to consider with a rough idle is fuel injectors, spark plugs, things like that. But if your idling is too low, i know how to fix that. You have to get access to the cars ECU, its computer. On my car, and probably any maxima after 89', it is located on the passenger side, on the dash near the passengers feet. you have to remove the plastic panel to get at it. When you locate it, you'll see a screw with tape over it. Now before you do anything, make sure the car is warmed up, and when it is, put it into drive, and put on the E-Brake. Then turn the screw Clockwise to increase the rpms, and Counterclockwise to decrease the rpms. Try not to turn it too far clockwise, because if you do, you will go into diagnostic mode. You'll know you've gone too far clockwise because the car will quickly fall in rpms when you hit diagnostics mode, and you'll see lights blinking on the computer. If this happens, dont panic, just simply turn it back down. Try to get a rpm (in drive) around 750-900, that should suite you fine