j30 hesitation

[marc.r]

Hi all

i change lot of part on my j30 and still have the same problem 1fstchange plug for ngk iridiumchange air filterchange oil for synteticchange the left and the right manifold they where break because i think my cat was full also change the little pipe that connect to the egr valve.after i take the car to the dealer to find out why i always have that hesitation under 2k rpm the guy plug it and he see the mixture was a little to rich, after he plug a vaccum tester and my vaccum was to poor, they charge me 120.00 for check it.

so i change the egr valve he say me maybe its leaking i buy a brand new one for 240.00 i change it myself because they are running at 86$ per hour and its the same thing.

i don't know what to check more maybe its my maf sensor but thats 600.00 dollars on the scanner my maf was ok but the guy tell me its not shure

but there a few thing maybe can help you guy to help meif the air is cold the car is not running so bad hesitate but not like when i'm in the trafic and its hot outside friday here when i came back from the city the temperature outside was 24 celsius the hesitation was terrible when its raining its the same thing when i start the car in the morning there is no hesitation for the first 5 minutes

someone can help me please. i like that car and i want to keep it but maybe the reason gone get me.

[maxnix]

NGK Iridium are not OEM specification.

Post in the Infiniti Mechanic Forum for a response. You do not have an engineering question or comment.

[marc.r]

do you think that can only be my problem now

[sparkplugs.com]

as long as the plugs are correct for your vehicle and correct heat range, they dont have to be oem specific - iridiums should run better than your standard copper plugs - we can double check your part# just to be safe though.

[driverdriver]

I strongly recommend running OEM spark plugs on the J. Running non-OEM plugs do a lot of strange things to the engine and can cause damage. Just run a search and check out all the posts.

[marc.r]

Hi again

I try oem plug platinum i was sensing a vibration in idle position, so i clean and put back my iridium plug and there is no vibration anymore.

But i find to a little adjustable screw on the back off the motor, at the left side if your looking at the motor from the front side.

Thats i think is the iacv unit i try to turn it because my idle rpm was at 600rpm and the motor was shaking, so i open that screw at max position the rpm goes up to 800.

Now the hesitation is there again, but the acceleration is better and my motor was shaking at 800 with the oem plug so i put back iridium plug and the shaking disapear.

But i still have the hesitation, i always put premium fuel with 1 pint of octane boost when i full up my tank.

i order a maf sensor they are $600.00 i found one on ebay and a ecu Computer Unit i will receive it soon i will see if thats gone fix my problem.

Modified by marc.r at 11:26 PM 5/17/2005
Modified by marc.r at 11:27 PM 5/17/2005