KA skipping/jerking at speed, stalling when ideling/stopping

[BlueTyGator]

I Have a 92 240 KA24DE. Yesterday it started running really rough around town. I can set the cruise and it will go fine for a few seconds then begins to surge like I'm tapping the gas pedal. If I try to hold it at a RPM (say 3500) she jerks so hard I can't keep my foot in the same spot. When I put it in neutral or when I come to a stop I have to hold the pedal in some to keep it from stalling. Only seems to be a problem when there's no heavy load on the engine. If I gun it she purrs just right all the way up. But speeds around town it's barley drivable... Also this started shortly after I filled up the tank (chevron 93). Ordinarily I get about 50 miles before the needle budges off full. Since I filled it up I have gone 23 miles and I'm down to 3/4 of a tank...... Possible bad gas??

Recent Parts Added:

Distributor capRotor buttonPickupK+N Air filterPlugs and wiresFuel FilterCTSStage 3 clutchFlywheel

I'm thinking Fuel pump, MAF, or O2 sensor... Please help!!!

[ArdmoreS14]

Sounds kinda like the same problem I was having on my 95. At first I thought it was the EGR when I replaced that it still had the problem. Dis-connect the TPS check all the pins scrap them off some. Blow out the connector just clean it all up. That solved my problem. If it was your MAF you wouldnt really be able to floor it and move very fast. The O2 sensor can cause the bad fuel mileage, but wont cause it to do all that. Is your engine light on? Run a self diognostic with the ECU, some codes wont turn the light on your dash but will save the code in your ECU. And your fuel pump is unlikely too because most of the time they will just go out. What about the fuel filter. is it new? If not put a new one on before you tear into the car looking for a problem. I would try the TPS though, that seems to be alot of peoples problem.

[BlueTyGator]

Ok so I pulled the Ecu codes and got

33 O2 sensor45 injector leak

Only thing is both these codes should have thrown my engine light on. but didnt....?

going to tear into the TPS procedure tomorrow.

Should I go ahead and replace the o2 first???

Any help is greatly appreciated.Thanks in advance

[ArdmoreS14]

Yeah they should have turned your light on. When You did the diog. did the light flash the code too? Maybe a bad bulb? First replace the injector, or all 4 might as well while your in there. The O2 sensor can wait because its not gonna make the car run that bad. Mine was out for months, and my fuel mileage suffered a little but no driveablity issues. It can wait, cause the injectors are gonna be kinda pricey. I would still do the TPS thing too, but the injector is likely the cuase of all you problems.

[(Yoshi)]

This happened to me and it was an injector. To check to make sure let the car idle and then pull and replace one spark pluge wire at a time to see which has little to no effect on the idle of the car. And if you want to save on fuel injectors post a wtb in the nissan parts clasified and I do believe that maximas have the same motor as the 240 and same injectors. There are a couple more of them do a google search then check junkyards for them. But I got my fuel injector for I think 15 or 25 shipped from someone on here.

[ArdmoreS14]

Dont all maximas have 6's? You thinking about the altima?

[(Yoshi)]

eh prolly Im not 100% sure, I found a sheet that had a list of cars w/ ka24de but can't remember what was on it or where I found it. GOOGLE!!!

Edit- here is list of usa cars w/ the ka24de

Nissan XterraNissan Frontier93-01 Nissan Altima91-98 Nissan 240SX (dur)93-97 Nissan Bluebird

[ArdmoreS14]

Dont all the trucks have the KA except the newer ones

[(Yoshi)]

no I don't think so

[BlueTyGator]

Dont really got the dough to replace ingectors right now.. so i pulled the wire on the O2 sensor and all the symptoms cleared up... Until this morning, right after I cranked her up she was missing and searching for an idle betwen 500-1500 and stalling for about 5 minutes. reved it a couple of times and the problem went away again.

Gonna go into town and pick up a new O2 sensor today...

Also after I disconnected the o2 sensor I ran it for a few minutes then rechecked the codes, 5-5. I expected the O2 code to go away since I disconnected it but whats the deal with not having the leaky ingector code anymore. If they were really bad it would still throw the code right? Possible fluke in the computer???

[(Yoshi)]

I strongly think its your injectors or at least a injector...

If you want to save money post a wtb here on nico or look for one of the cars in the list at a junkyard and grab the injectors...

[BlueTyGator]

Ok couple more things,

first I've been looking on the fourms for injectors, seeing alot of different sizes (450cc, 550cc, ect)

How will the size effect the car? (power, fuel consumption, ect)

Is there a certain brand that is better than others?

What kind of other modifications will I have to make if I go with a High-flow system? How much will it cost? (ballpark)

Moving on....

I, for some reason decided to clean the terminals on my old O2 sensor and reinstall it after resetting the ecu... Now it runs fine. So was my O2 sensor not realy bad after all??? Havn't rechecked the ecu yet (afterwork today)

Why would it have thrown a O2 code If there wasnt a problem? Because of a leaky injector right?

[180fan]

bigger injectors = lower fuel economyhigh flow system? depends on how much power you're making first. The more power you make, the more stuff you'll need. You should look to invest in at least an aftermarket fpr if you're gonna jump up your injectors.

the o2, was probably just a loose or bad connection. The injector is still an injector code though. That's the biggie you should deal with. The o2 sensor, replace at your next tune up.