I have a 1993 Maxima SE. It started to hick-up about two months ago. The car has benn sent to a certified Nissan mechanic to try to fix the problem. the problem with the car is that while driving, it will act as if you cut it off, but it will still be running. It will start bucking until you let off of the gas. After you press the gas again it will strighten out for a while and start bucking again. The tachometer bounces during the bucking. The crankshaft position sensor has been replaced along with the power transistor unitand mass air flow sensor. I checked the coil packs and all seemed within range. I am looking for any help avaliable. I will be checking the forums for any help. The maxima is a dual over head cam V-6. Thanks for the help.

 

Did you put in new spark plugs? Are they Bosch or NGK?



Mine did the exact same thing as you describe and I did all of the same stuff you did. I even swapped in a different ECU and throttle position sensor. It was one of the rear coil packs causing all of my trouble. I know these are expensive, but driving your car this way is not very safe. I almost got in a couple of wrecks during it's little bucking sessions.

I would also replace the o2 sensor, just for good measure (if you haven't done so already).

 

have the injectors been checked?
did you inspect the coils for cracks?
pulled the plugs to check for fouling?

 

A coil pack can look good and work most of the time and still fail under stress. Get one of each and swap them two at a time.

 

I just swapped mine one at a time. I bought some used ones from someone who wrecked a pefectly running car.

 

Mine did the same thing when it was cold. But then I just sat down and we had a good chat and I guess we just came to an understanding. It never happened again.

 

it was th coils on mine to

they looked fine and checked out on ameter but they were definitly the cause of my bucking

 

o2 sensor was my problem; bucking went away real quick

Now i'm having power loss issues......HOORAY!

 

losing power when the engine gets warm? Especially after 30-60 minutes of driving?

Probably your knock sensor.

 

All 3 packs? I can't see just one causing my car to buck like a manual learning newbie.

 

hmmm mine did that recently as it turns out the altenator was shot, well not shot completely but weak, i bouthg a new battery thinking that was the problem and it solved it for a while till i was on my way back from new york to my home in pa when the altenator finally decided to give the ghost but i had all the syptoms you did, crazy buck and crazy rpms... i hope this helps...

 

The spark plugs are ngk. Another question that maybe you can answer. Will the computer form a 94 Maxima fit the 93. They both have the same engine but the 93 is distributorless and the 94 is not.

 

What did u say to him?


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Tleteach
"The spark plugs are ngk. Another question that maybe you can answer. Will the computer form a 94 Maxima fit the 93. They both have the same engine but the 93 is distributorless and the 94 is not.

No, it will not.

Tst: Clean the coil packs, spray over insulating lacquer layer, might eve work...

Lots of things go wrong when ol' computers get ctrl over u car:
http://www.cardomain.com/memberpage/748507/14

 

he has a VE which is distributorless.
the VG has a distributor.
both were available from the 92 model year to the 94 model year (which appears to have ceased production by april of 94)

 

Thats why I told him to tst if lacquer works on the packs as it works on the distributor; like this:
"Tst: Clean the coil packs, spray over insulating lacquer layer, might eve work..."

 

I have this same problem. But I have a VG. I am going to be replacing the o2 sensor in the next few days. If thats not the problem, does anyone have any suggestions?

I just recently replaced dist cap, wires, plugs, & fuel filter to try and remedy this problem. But its still there.

 

Mine did that too, replaced coil and fuel filter and haven't seen the problem since. It's a VG BTW.

 

The car hick-uped with my wife and she stomped the gas peddle to the floor and since then we have not had any trouble with the car. Still don't know what caused the orginal problem. Thanks for the help.

 

Good thing it went away! I had the same problem....I replaced the 02 sensor plus I pulled the injector plugs, blow some compressed air in it (coz they were corroded), plugged it back in....buckling went away! I couldn't pin point whether its the 02 or the plugs.

 

--->TPS

read: http://www.cardomain.com/memberpage/748507/6
http://www.cardomain.com/memberpage/748507/14

 

I replaced my o2 sensor two days ago and it fixed my problem.

 

I had this happen to a car of another make (Toyota Supra) and it was a hairline crack in the intake plenum to the throttle body. Under acceleration the motor mount would flex, opening up the crack just a little allowing un-metered air into the throttle body. The computer would dump in more gas to compensate and the bucking would start. Under idle or deceleration the crack was shut completely. The fix was a 60.00 intake plenum hose. Hope this helps. Ed Fisher Dallas, Tx

 

Mass-Air Flow Sensor was my problem here. The "bucking" is a the maxima's fail-safe mode, which does not allow the car to go above 2200 RPM when in that mode.

I solved the sudden "cutoff" thing with a new fuel filter

 

My Maxima started bucking again. Would a change in the humidity have any bearing on the problem. thanks

 

Humidity affects cracked distr cap, and high voltage systems, insulate or replace.

Humidity affects clygol micro chrystal remnants from past cooland leak over engine compartment: particles sucks water from air causing short circuits. U dont see them; wash off with lots of water.