Tboneterry

I have a 03 Nissan Altima 2.5L SE . About a year ago it started idling rough when you put it in drive. It has not really gotten worse but now I have started smelling gas sometimes. The dealership cant find anything wrong. They have tested the throttle body, throttle position sensor. MAF sensor, Intake gasket, and just about everything else. Its not giving any codes. It just feels like timing doesn't advance when you put the car in drive. If you turn the air conditioner on it will smooth it out. Ive changed the plugs but have not changed the wires the dealership said they were fine. Also have checked the 3 way going to the converter and this is fine. The car has 75000 miles on it.

I cleaned the throttle body. Cleaned the MAF. Changed the air filter and spark plugs. I took it to the dealership they reprogrammed the ECU and ran diagnostics. The car runs good but you can tell it doesnt have the power it used to. It idles perfect in park and runs smooth all the way up to hwy speeds. You can tell its a little sluggish when you get on the gas. Its just when you put it in drive and sit idle it vibrates. Its not loping and skipping just seems like its idle is too low. When you turn on the air condition the idle goes up and it smooths out, but when you put it in drive its like it doesnt sense the extra load and the idle stays just a tad too low. Just recently I have noticed you can smell gas in the car when you are at red lights or just stopped. Its not strong but you can smell it. I thought this may help in the diagnosis. The motor mounts are like new also. So im stumped. Fuel pump or fuel filter ?? Maybe but would it run this long without getting worse ? Someone told me to replace the Crank position sensor because it can cause problems like this without giving a code. What do you think ?


Thanks in advance


Terry

(0)

NISMOALT

try this to test it out:

drive the car a bit.
when it starts shaking like you say...park it somewhere and pop the hood open.
now unscrew the cap that is on the radiator where antifreeze passes through (have a towel thrown on it before you twist the cap as the fluid is VERY hot).
if when you unscrew it and some fluid comes out and the car stops shaking. theres your answer.

may be a clog or possibly the coilpacks but you say you have changed that right?

in a wild shot it may be the IACV

its definately not anything major like engine or tranny though but is just as annoying and can even be dangerous i would say

(0)