99 Sentra Hesitation On Acceleration?? - Nissan Forum
GA16DE 1.6L Engine Engine Discussion: 91-99 Sentra, 95-98 200SX, 91-93 NX1600

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#1 Old Mar 3rd, 2008, 01:12 PM
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99 Sentra Hesitation On Acceleration??

I have this problem and got directed here, hope u guys can help. Im having a hesitation problem when I accelerate from a take off or in general when I accelerate on the highway. I have done some reasearch and replaced the plugs, wires, and filter already. After more thinking I realize its maybe an airflow issue cause there is no form of hesitating when its at idle, only when I accelerate. Im told it may be the MAF or 02 Sensors? When I took the Air inlet on the intake u can hear it sort of gasping for air in the intake. Im confused. Thanks...
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#2 Old Mar 3rd, 2008, 08:48 PM
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May not help,but just some input.Bad MAF will sorta limit your RPM to only 2000;a bad O2 sensor will significantly drop the gas mileage,and will throw a check engine light.
Have you ever changed the PCV valve?It's like a $10 replacement,even if it doesn't cure the problem it sure will help a little.I am leaning toward the MAF.Have it checked.

Also suggest to clean the IACV when you check the MAF,and change the fuel filer if you didn't do it.

Last edited by joeli16; Mar 3rd, 2008 at 08:53 PM.
#3 Old Mar 3rd, 2008, 08:53 PM
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I actually got the codes read earlier and were against the MAF. Nothing else read bad. Its malfunctioning, ima get it replaced tommorrow. And yes, im getting poor gas mileage, like 18MPG on the highway. THANKS
#4 Old Mar 4th, 2008, 11:26 AM
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Well, went this morning to get a replacment MAF from a junkyard. They tried 3 they had and the car did the same on hesitation on acceleration. Im very confused dont know what to do. He told me it may be a short since the car should shut of when the MAF is disconnected, it kept running when disconnected. Im confused....
#5 Old Mar 4th, 2008, 12:14 PM
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What were the codes ?
Read up on the IAVC as this causes this and it may need cleaning.
Good Luck..

2003 Pathfinder from 2004 SE 4WD
1997 SER 5sp Manual from new Rear Ended 2009 !!
Gone to the Knacker yard...
New ride 3.0 manual RWD not a Nissan !!!
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#6 Old Mar 4th, 2008, 12:27 PM
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I went to AutoZone and it read the MAF was malufuctioning. I was told it could be a vireity of things in that loop. I went out to the junkyards, the guy told me if the MAF was bad it may be hard to start. I have no issues at all. Just it hesitating on acceleration and wasting alot of gas. Im getting about 17mpg now on the highway.


Im reading the Haynes Manual now, wheres that located?
#7 Old Mar 4th, 2008, 04:20 PM
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I have had your symptons before on a nissan vehicle, it wasnt the sentra but it was on my 240sx. It was getting really bad gas mileage, it would hesitate upon acceleration and bog down. The first thing I would suggest is to check your timing to see where it stands. Mine was severely retarded when I bought the car. The next thing was the coolant temp sensor. Now, im pretty sure if this sensor is bad it would show a code for it. The last thing I replaced was the TPS. My computer did not show a code for it but after testing it with a volt-meter, i deteremined it was bad. When i replaced it, everything worked perfectly. My retarded timing was caused lack of power; the coolant temp sensor caused horrible gas mileage and caused the car to move violently back and forth; and the TPS caused a horrible hesitation form a dead stop and from a steady cruising speed. I hope this helps out a little bit and you can get some ideas of what to check.
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#8 Old Mar 4th, 2008, 09:30 PM
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Well, today was my first day back at work and I again had access to all my tools including my DMM. I followed the Haynes Manual and checked the voltage on the MAF. It says at idle im supposed to read 1.3v~1.7v, I was reading at 2v. With engined revved up to 4,000rpm im supposed to get a reading of 4v, I was reading at 3v. With the inginition on and engine off im supposed to see a reading of less that 1v, I was reading at 1v. Im assuming since all 3 of these readings failed the MAF is bad. Ima try that tommorrow.
#9 Old Mar 5th, 2008, 11:52 PM
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You don't say what yr and engine you have. some of the earlier cars had a bad ground problem, and dirty contacts were also common.

2003 Pathfinder from 2004 SE 4WD
1997 SER 5sp Manual from new Rear Ended 2009 !!
Gone to the Knacker yard...
New ride 3.0 manual RWD not a Nissan !!!
1997 Sentra GXE from new .... Sold 2008
2001 Sunny N16 RHD from new (N16 Nissan Bluebird Sylphy) Sold
#10 Old Mar 6th, 2008, 01:09 AM
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Sorry, its a 1999 GXE 1.6L
#11 Old Mar 6th, 2008, 09:01 AM
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Well thats well away from the ground problems, but i would still clean the contacts.
The low reading indicates less Airflow not more, so wouldn't it run Lean not rich ???
As mentioned and others have reported a bad temp sensor causing bad mileage.
If the MAF is bad its meant to go into limp home mode and not rev above 2000 or 3000 rpm.
good luck, sorry i cant help more.
My car did throw a TPS code, I removed the plug and tested it with a meter and it was fine, replaced the plug and no more codes.

2003 Pathfinder from 2004 SE 4WD
1997 SER 5sp Manual from new Rear Ended 2009 !!
Gone to the Knacker yard...
New ride 3.0 manual RWD not a Nissan !!!
1997 Sentra GXE from new .... Sold 2008
2001 Sunny N16 RHD from new (N16 Nissan Bluebird Sylphy) Sold
#12 Old Mar 6th, 2008, 09:44 AM
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I purchased the MAF already, see what happens. If no cure, Ill try the TPS. Im also told to clean the ERG? Would bad 02 Sensors cause this hesitating?
#13 Old Mar 6th, 2008, 10:54 AM
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I would suggest you replace the MAF and check the voltage readings. If its now OK I would search here for IACV and the cleaning instructions.
I am not sure the EGR has been much of a problem and even if it was I don't think it would give you these symptoms, but thats my guess not fact.

2003 Pathfinder from 2004 SE 4WD
1997 SER 5sp Manual from new Rear Ended 2009 !!
Gone to the Knacker yard...
New ride 3.0 manual RWD not a Nissan !!!
1997 Sentra GXE from new .... Sold 2008
2001 Sunny N16 RHD from new (N16 Nissan Bluebird Sylphy) Sold
#14 Old Mar 6th, 2008, 10:58 AM
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Where would the IACV be? I have tried searching, even in the Haynes book. I cant seem to find it, i guess im passing it up. THANKS
#15 Old Mar 7th, 2008, 02:03 AM
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Here you go,IACV cleaning thread:
http://www.nissanforums.com/b13-91-9...-pictures.html

I agree with dark knight,you should check your timing too.If it's way below 10 degree,your car will run like crap.
If it's not the MAF,the next thing to check/change is O2 sensors and coolant temp sensor.
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