95 J30 starting problem

[jhuddy1234]

I'm having a problem wherein my J30 starts, then the rpms drop and the engine cuts off. When the engine is warmed up it fires up fine, but when cold i have to give it gas. It's basically flooding itself. I've had throttle body cleaned, new plugs, oil, etc. But still same problem. Local mechanic was stifled.Note: even when warmed up the rpms drop to 800 range before "catching" and going up again to over 1000.I'm baffled.Any suggestions?

[RideInMyJ]

how old is your battery?

[TakDrift]

What brand spark plug did you put in? If you put in Bosch plugs that is a big problem. I've researched this thread and also in the "Infiniti Articles" thread and recommends against using Bosch and use NGK specifically. The J30 manual will give you the specific number. After reading the articles in this forum about the spark plugs, I took a look at the recent Bosch plugs I installed, around 4k to 5K since I installed them. The plugs were fouled and I also noticed that there was a more prominent exhaust fumes with these plugs even after the engine was warm. Check the brand of spark plug. Hopefully this helps.

Greg

[jhuddy1234]

The battery is new. It cranks just fine and I can get it started but i'm worried about the long term effects of this problem. I'm not sure about the plugs, as my now ex-mechanic installed them. But this problem occured before and after the plugs have been changed.Also, if anyone knows of good Inf. mechanics in DC/VA metro area let me know.

[TakDrift]

Check your plugs especially the #5 and #6. There is crossmember that links the left and right throttle bodies and it interferes with the removal and installation of those plugs. It makes a regular socket tool extender contact the plug at an extreme angle that the plug insulator (the white part on the plug) will get cracked and cause spark problems. I've found a fix to this by just having the socket wrench just below the crossmember when removing and installing. I've seen a cracked plug firsthand. I removed my #5 plug and it was cracked in two places from top to bottom. That was when I realized I had those idling and erratic throttle response. And do definitely replace them with NGK. PFG5R-11, if I'm not mistaken.

[jhuddy1234]

Thanks, tho' it has been happening before and after the plugs were changed. I'm wondering if it's an airflow sensor or somesuch. It seems to be getting too much fuel.