Soilsack
09-18-2011, 03:17 AM
As a disclaimer I feel it needed to be said that I have attempted searching and all it is getting me is more confusion.
I'm having some issues with a stock KA engine. Rough idle, random stalls, bad mpg, service engine light.
1998 Nissan 240SX SE with 98,000+ miles.
Stock KA24DE engine with new stock air intake, stock exhaust, new electrical system.
An explination of the issues is as follows:
1A) When at rest and I have the A/C on it idles fine. When I turn the A/C off the RPMs drop to around 250 and shudders. Sometimes it is able to fight its way back to about 750 RPMs and sometimes it stalls. If I assist with the accelerator or turn the A/C off while driving it seems to stablize.
2A) The service engine light is on and the OBDII reads that the O2 sensor left bank is reading the system is too lean.
3A) I'm only getting about 15 mpg combined. I admit I do drive it hard sometimes but I feel that it shouldn't be THAT low. It's not like I'm gunning it at every light and flooring it to 100mph.
What I am considering, looking into, and am asking about:
1B) What would be the likely cause of my issue?
2B) I am considering sea foaming the engine. Is this a good idea?
3B) I also want to do a full tune up after seafoaming. Change oil and filter, change fuel filter, change spark plugs, and possibly change the O2 sensors. Can any of this be avoided and are there any recomendations as to brands/manufacturers. Also what type of oil do you suggest for a stock KA?
4B)Are there any other things that I should look into replacing/repairing?
Please answer each concern/question by addressing the number value I have assigned (e.x. "1A) [answer here]") simply to streamline the process.
Any help or info. is appreciated.
I'm having some issues with a stock KA engine. Rough idle, random stalls, bad mpg, service engine light.
1998 Nissan 240SX SE with 98,000+ miles.
Stock KA24DE engine with new stock air intake, stock exhaust, new electrical system.
An explination of the issues is as follows:
1A) When at rest and I have the A/C on it idles fine. When I turn the A/C off the RPMs drop to around 250 and shudders. Sometimes it is able to fight its way back to about 750 RPMs and sometimes it stalls. If I assist with the accelerator or turn the A/C off while driving it seems to stablize.
2A) The service engine light is on and the OBDII reads that the O2 sensor left bank is reading the system is too lean.
3A) I'm only getting about 15 mpg combined. I admit I do drive it hard sometimes but I feel that it shouldn't be THAT low. It's not like I'm gunning it at every light and flooring it to 100mph.
What I am considering, looking into, and am asking about:
1B) What would be the likely cause of my issue?
2B) I am considering sea foaming the engine. Is this a good idea?
3B) I also want to do a full tune up after seafoaming. Change oil and filter, change fuel filter, change spark plugs, and possibly change the O2 sensors. Can any of this be avoided and are there any recomendations as to brands/manufacturers. Also what type of oil do you suggest for a stock KA?
4B)Are there any other things that I should look into replacing/repairing?
Please answer each concern/question by addressing the number value I have assigned (e.x. "1A) [answer here]") simply to streamline the process.
Any help or info. is appreciated.