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Hesitation when accelerating

240K views 56 replies 25 participants last post by  Dakbadu  
#1 · (Edited by Moderator)
I have a 2003 Nissan Murano, and following a complete tune-up by a local mechanic, I am having a slight acceleration problem. Once the car is warmed up, when I accelerate from a dead stop, the engine hesitates if I don't give it enough gas. Once I am above 2000 rpm and cruising along, I can accelerate without any problem. The mechanic told me that the onboard computer might need to be "re-flashed" since power was cut off to the system during the tune-up. He said that this would have to be done at a Nissan dealer.
Any thoughts?
 
#2 ·
You're not the only one having this problem. You're going to have to be more specific for us to help you diagnose it. At this point, it's either the throttle body, ground under the dash, or a bad CVT. Depending on the failure characteristics will tell which one is at fault.

So, describe in detail what is happening to your RPM's. From a complete stop you push on the gas pedal. Do you observe either:

1) The RPM's stay low. When you give it more gas the MO will hesitate a bit and then race off.
2) The RPM's follow the gas pedal but the MO stays put. Eventually the MO will take off.

If it's #1 then you're Throttle Body is bad or you have a bad ground under your dash.
If it's #2 then you're CVT is bad and it's time to replace it.
 
#3 ·
The problem is more like #1. It doesn't do this all the time, but enough to be annoying. The hesitation feeling is like the vehicle is jerking somewhat. It accelarates as I give it more gas, but acts as if it is not given enough fuel to get the job done. This is especially a problem when I go from a virtual idle and have to go up a slight incline. It jerks once or twice, and as the rpm's rise above 1500 or 2000, the car runs smoothly.
 
#35 ·
Hi Doctor! I'm having the same issue. How was your problem solved?? A relearn needs to be performed? This starts to happen to me when i changed the camshaft position sensor bank 1....the mech told me the sensor is original...but i didn't see it...i read in another post that somebody experienced the same when he put a non original camshaft position sensor....as soon as he bought the one from the dealer nissan it stopped!!...

Please i need some light...a poor woman in need of some direction...don't want to be scammed...!!
 
#4 ·
Sounds like you will need to perform the Idle Relearn procedure as your ECM may has lost its memory due to prolonged battery disconnection. You can perform the procedure yourself (steps are posted elsewhere on this forum, I just cannot remember where!) or have dealer do it for you.
 
#5 ·
my 04 sl is doing the same thing. Some days it runs perfect and others it does it all day. It seems to be around 1200rpms and worse when it's hot and under load like when the ac is on. Almost acts like its in to low of gear. I've replaced plugs, cam sensors, crank sensor, air filter, all vacume lines, battery, and cleaned the throttle body and maf sensor. I wish we could figure it out. I love my mo but this is driving me crazy.
 
#6 ·
My 05 Murano is doing the same thing. Starts fine. Idles fine. but, from a complete stop, it's almost like it doesnt even know I'm pressing the gas pedal. for 5-10 seconds it barely starts creeping and then, at about 1000 RPM or so, it goes like normal.

As long as I'm moving (10 mph or more), it drives fine.

It doesnt do it all the time, though. And when it happens, it's usually within the first 5 minutes of driving on surface streets. If I get pas that five minute mark, then I'm good to go all day. Well, at least until I turn off the car.

It's a crapshoot. I've got it at the dealership as we speak and even they can't figure it out yet since it appears to be so random.:confused:
 
#7 ·
Right after I posted this I got a call from the dealership. They were able to get the problem to occur while they were driving it around, so they were able to get a good reading from the computer.

It was the transmission. More specifically, the valve body. It's shot. I'm not sure exactly, but I'm guessing something is preventing pressures from building... maybe a seal or something that's gone bad. Thank God Nissan extended the warranty to 120,000 miles. I'm at 110,000 now.
 
#11 ·
INTERESTING!!!

My MO just turned over 107K miles. If this problem is related to the valve body then I'll definitely be turning it over to my local Nissan dealership! I've noticed the tranny not responding some this year already. If it happens consistently then I'll be taking it over for sure.
 
#12 ·
Nissan released a bulletin last year, Nissan Publications


IF YOU CONFIRM There is a slight vehicle hesitation type feel and/or a surge type feel when all of the following conditions are present: Speed between 10 and 45 mph, and Transmission torque converter clutch is engaged (lock mode), and Engine RPM between 1200 and 2000, and Light acceleration. IMPORTANT NOTE: Very slight vehicle hesitation type feel and/or surge type feel under these conditions are a normal operating characteristic of this vehicle and are within design specifications for the vehicle. However, for those customers who are particularly sensitive to this characteristic of their vehicle, the actions in this bulletin may be performed for customer satisfaction. ACTIONS 1. Refer to Step 2 in the Service Procedure to confirm this bulletin applies to the vehicle you are working on. 2. If this bulletin applies, make sure the customer is informed of the Customer Information in this bulletin. 3. If after informing the customer of the Customer Information, the customer voluntarily choosesto have the condition addressed with the specification change, then: Reprogram the TCM, and Install the Torque Rod Service Kit listed in the Parts Information. See this bulletin for further detail.
 
#19 ·
Don't know what to say... could be a number of things. Yeah CVT might be going bad, maybe a line pressure problem, who knows. There is a TSB for first gen muranos with updated valve bodies for hesitations but i think there has to be a code stored in the tcm, can't remember. Its impossible for me to tell you whats wrong with it from here, unfortunately your at the tech's mercy but hopefully they will get your issue resolved.

As for the hoping nissan recalls something, not sure what you want them to recall, the entire CVT? And do what with it, replace it with a standard automatic transmission? You've already got a 120k mile warranty! What else do you want from them?

Its not just Nissan having issues, guys. All manufacturers have issues, just go to any forum. Even... yes.. .Toyota! For every few guys complaining about something on a forum, there are thousands of similar models out there working just fine. My 04's got just over 125k on the same CVT, transfercase, engine, diff, etc. All i've ever needed to be done was an exhaust manifold, tires, belts and spark plugs and i've known this car since it was brand new as it was my sisters.
 
#21 ·
It's the Valve Body

After taking my 05 back to the dealership for the second time, they were finally able to experience the problem. After a while they were able to pull the code P0868. Transmission fluid pressure low. This is referenced in bulletin ntb05-084a.

Long story short... replace the valve body. Get it done before 120,000 miles and it's under warranty.
 
#22 ·
Did your check engine light come on for them to pull the P0868 code? I'm starting to think we have 2 different causes to the same hesitation failure mode. Either you have bad grounds, throttle body, or accelerator pedal or the valve body in the CVT is wearing out. Thus far, I have hesitation off and on when at a stand still trying to accelerate. When I notice this, I will have hesitation in all situations. A restart of the engine will resolve it temporarily. But...important part, I have yet to throw a code.

The other cause sounds like you're having hesitation while moving. Sound right?
 
#23 ·
No check engine light ever came on. The code came up while they had a Nissan laptop plugged into the car and they were driving it around. Hesitation only happened from a complete or near-complete stop. Once I got going it was fine... Until the next time I had to stop. I got the car back 2 days ago and the issue hasn't come back.
 
#24 ·
I have an appointment with Reliable Nissan here in Albuquerque to look at my issue. Has happened 2 days in a row and I"m worried. Talked to them, and the preliminary discussion indicated they would have to swap out the entire CVT!!! Not good for a 1 car family. :(
 
#25 ·
After digging into this more, to meet the TSB you have to experience the following:

1) Acceleration hesitation.
2) MIL light not on.
3) TCM stores a code of P0868.

Will hopefully have the TCM code stored so I can get it fixed. The other 2 conditions have already been met.
 
#26 ·
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#28 ·
I'm having this exact issue :| Unfortunately, I'm at 140k! I thought it might have been due to plugs (Bosch). In the winter, I get what feels like a misfire under light acceleration at the conditions listed in an earlier post...

Is there a way for me to self-diagnose this issue better? I have symptoms which seem more like Warhammers first scenario (sluggish on acceleration from stop).