!!car acting very weird!!

[bruce240]

:help lately my car has been a little laggy and then today on the way home it barely wants to start out in 1st and almost goes back down to 0 rpm, then when i shift to 2nd it backfires and hesistates, from 2nd to 3rd its does the same and same for all gears.also then sometimes, when accelerating id be flooring the gas and the car does nothing, i switch gears it worksfor awhile... then the gas has no effect on that gear.. and it just keeps doing that

any ideas?

[hotshot240sx]

you may be having a computer problem, thats what it sounds like..other than that i would think its ur transmission...good luck on figuring it out...

[fenrisx]

I was gonna guess it might be the fuel pump but you said something about it backfiring. My 92 Pontiac Sunbird was starting where it wouldn't hardly go..even floored(sucked when pulling into traffic). My granddad and I put a new fuel pump on it and all was fine. I haven't really delt with a 240..just throwing my 2 cents in.

[rudeboy]

well a quick check of all the hoses under your hood might help.i found a fuel leak one day when i took forever to start.when you get in and turn the key to the ON position do you HEAR the fuel pump?

[bruce240]

well i checked my fuel pressure already and it is fine, could it still be the fuel pump? also could it be my spark plug wires, it not firing corectly, leading to backfire.

[Boehm]

I've seen this with everything but the backfire with mine when the MAF slips loose.

Check to make sure it on good. Also check wiring.

Is your ecu giving you a code? It might be able to find the problem for you.

[bruce240]

i havent actually diagnosed my ECU i have no idea how. and am worried about playing with the "brains" of my sweet car.

[nismo240]

I BASICALLY HAVE THE SAME PROBLEM WITH MY CAR!! IT'S WEIRD IT DOESN'T WANT TO ACCELLERATE RIGHT FOR SOME REASON....THANKS FOR THE ABOVE INFO. THOUGH! I AM CHANGING OUT MY CLUTCH AND PRESSURE PLATE AND THE BEARINGS SO THE CAR MIGHT BE A LITTLE BETTER.......

[technoman]

Are you guys seeing alot of black smoke coming from the muffler?It is possable that the mass air flow meter is not reading correct.

[bruce240]

nope there was no black smooke.i actually just figured it yesterday, it was the distributor cap, it had white stuff all over it, bought a new one for $10.00 and the car drives!! still hesitates when accelerating tho, and i have a new clutch and all. so nismo it might not fix yur prob. thx for replys guys.

[technoman]

I would suggest cleaning all wiring contacts Nissans are prone to corrosion. Clean every connector you can find and unplug. HINT the TPS is always dirty and clean the temp sensor connector and air flow meter connector. This will help.

Also try the "wiggle" test on the engine harness to see if there is change.

[bruce240]

thx techno i will try that and keep ya updated

[bruce240]

well techno u are a f-ing GENIUS. i unplugged my temp sensor and started car, at first it didnt even start then finnally it fires up and a huge cloud of balck/gray/purple/white/pink/nasty colors come out form exhaust. anyways, i put plu sensor back and THERE is no LAG

[technoman]

You should clean it with some kind of contact cleaner to get out the corrosion. Out of the wire.

[bruce240]

well actually its kinda funny, cause yesterday i had no lag, but today after i dropped my bro off at school i noticed the same lag again, does this mean i need new o2 sensor, clean MAF, or a new temp?

[technoman]

Well you should NOT unplug sensors and then go start your motor. You just set off the check engine light. Who knows how many or what codes are there. Id suggest you have the ECU read to see whats codes are there. You may need to replace your ECU temp sensor. But I would clean all my sensors with diode electrical cleaner. Clear the ECU of all codes and see if the check engine light comes back on and that will be your problem.......

[bruce240]

well i diagnosed the ecu today.... and it didnt some up with any codes. it said my engine worked fine. plus my engine light hasnt been on but i know it works cause i did the bulb test.

[technoman]

what year is your car?

[bruce240]

93'

[technoman]

If the problem continues ask Dr John. I apprenticed under him for a wile when I worked for Nissan. He is a very good Nissan Tech! Or take it to some one you know who can diagnose the car for you.

[bruce240]

the problem gets really bad when its cold outside, but it will still be noticible when its hot.