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Sentra: I have a 93 1.6 Sentra that won't accelerate when climbin…

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I have a 93 1.6...
I have a 93 1.6 Sentra that won't accelerate when climbing hills
Submitted: 3 years ago.Category: Nissan
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Answered in 7 hours by:
5/31/2015
Nissan Mechanic: Mike V., Nissan Technician replied 3 years ago
Mike V.
Mike V., Nissan Technician
Category: Nissan
Satisfied Customers: 27,763
Experience: Nissan factory trained and Certified Subaru Technician.
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Hi there, Just to be clear, it accelerates on a flat road without any issues at all?
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Customer reply replied 3 years ago
If u push the gas slow it's ok
If u push it too fast it bogs down
Nissan Mechanic: Mike V., Nissan Technician replied 3 years ago
Ok, sounds like your maf might be the problem even though it is new, however, if the car has a plugged converter you might have the same symptom. If possible disconnect the front pipe before the converter and see if the car has better acceleration. if it does then you know the converter is blocked. It's going to be loud of course, but it's a good way to test it.Please try it and let me know.Thanks.
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Customer reply replied 3 years ago
I removed the cat and test
At idle no load revs up fine.has a slight hesitation if u push the throttle fast.
At idle under load if push the throttle fast it will hesitate at 1800 rpm
If I push it slow it will go to bout 2000-2200 steady for bout 4-5 seconds and drop back to 1800 with hesitation
Nissan Mechanic: Mike V., Nissan Technician replied 3 years ago
Is the check engine light on?
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Customer reply replied 3 years ago
No check engine light
Nissan Mechanic: Mike V., Nissan Technician replied 3 years ago
You need to check the timing at this point. With a timing light it should be about 15 BTDC, it sounds like the timing is not advancing. This could be a problem with the distributor or the ecm, if it's not advancing that is.
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Customer reply replied 3 years ago
Is there a way to test if the ecm is advancing.
Also can you tell me the proper way to adjust the timing on this vehicle.
Nissan Mechanic: Mike V., Nissan Technician replied 3 years ago
The only way to tell if the timing is being advanced is with a scan tool that can see the timing that the computer is seeing.HERE is a link to setting the timingWhat happens next:Just Answer will now charge you for the full amount of your question.My goal is to provide you with 5-star service. If you cannot rate me at least 3-5 stars, we will keep working on this.Just Answer does not compensate me for my time and effort; you do with a 3-5 star rating.Follow up questions are included in your question price even after rating.
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Customer reply replied 3 years ago
I will try a ecm
Does it need to be programmed
Can u give me a connector end view of the ecm.93 Sentra a.t. 1.6l
Customer reply replied 3 years ago
I just replaced the ecm with a used one.still same problem although sometimes it can rev pass 2000 when holding brk under load/same as before.
Nissan Mechanic: Mike V., Nissan Technician replied 3 years ago
Did you put a timing light to the car to first determine if the timing was on?
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Customer reply replied 3 years ago
Yes I did the timing again got it to 10 degrees.
Nissan Mechanic: Mike V., Nissan Technician replied 3 years ago
Ok, if you had to reset the timing then I am thinking the distributor is no good. Once you lock it in it should stay there. If you are having to reset it, then there is either an issue with the distributor or the timing chain
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Customer reply replied 3 years ago
I don't think it moved. I just wanted to do it again following ur post
Nissan Mechanic: Mike V., Nissan Technician replied 3 years ago
hmm, ok.No check engine light usually limits our possibilities.I would say next we have to check the fuel pressure to see if the issue lies there. Also, check the fuel pressure regulator vacuum line and make sure there isn't any fuel in it.Fuel pressure should run about 40 psi when the engine is at idle, 36 would be acceptable as well.
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Customer reply replied 3 years ago
Ok how do you test the fuel regulator
Nissan Mechanic: Mike V., Nissan Technician replied 3 years ago
The fuel pressure regulator is just a vacuum diaphram, if there is fuel in the vacuum line then its not any good. Also, you can unplug the vacuum line and see if the fuel pressure increases, if it does, then the regulator is doing its job.
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Customer reply replied 3 years ago
Fuel pressure is at 36 psi at idle.
Regulator disconnected goes to 45 psi.
At 1800 rpm with hesitation goes to 45 psi
Nissan Mechanic: Mike V., Nissan Technician replied 3 years ago
Nothing wrong with that at all.I am going to open this up for the other experts as I am out of ideas. Please don't reply or it will lock it back to me and they won't see the question or be able to reply.
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Nissan Mechanic: Jay, Nissan Technician replied 3 years ago
Jay
Jay, Nissan Technician
Category: Nissan
Satisfied Customers: 21,811
Experience: 20+yrs experience with Nissan & Infiniti Trained & Certified.Currently still working for Dealer
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Hi, My name is*****'m happy to help you. During our conversation, I may be presenting you with different things to try, and ask you some Questions to get a better understand of the issue so I can answer your question properly. So stick with me to the end, and I am sure we should be able to get this issue resolved for you! Based on the description on how it will accelerate when lightly applied but bogs when heavier applied does sound like a MAF sensor. I know you replaced it. Can you tell me where you brought it? Let me know, Thanks Jay!
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Customer reply replied 3 years ago
I got the maf from a running vehicle
Same kind car and engine
Same part number
Customer reply replied 3 years ago
Hello is anyone there
Nissan Mechanic: Jay, Nissan Technician replied 3 years ago
I take it you don't have a scanner to monitor fuel trim readings right?
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Customer reply replied 3 years ago
I have a scanner that can monitor fuel trims
Nissan Mechanic: Jay, Nissan Technician replied 3 years ago
Wow.. Perfect! .. Can you give me the Short Term Fuel Trim readings at idle when warmed up? I will be online tomorrow evening around 7 pm EST and be online till around 11 or 12 at night. Let me know..
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Customer reply replied 3 years ago
The short term trim is 100% at idle
The long term is 120
Customer reply replied 3 years ago
The pid is showing st alpha
Nissan Mechanic: Jay, Nissan Technician replied 3 years ago
Cool, the alpha readings are around 100? Ignore long term right now.. Only Alpha... That is around 100% at idle?
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Customer reply replied 3 years ago
Yes st alpha is 100% at idle
Nissan Mechanic: Jay, Nissan Technician replied 3 years ago
i would think you have a exhaust restriction maybe. I would try dropping the exhaust and see if that helps.
Drop it after the catt converter.
Let me know..
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Customer reply replied 3 years ago
I dropped the exhaust after the cat same prob
Hesitates at 1800 rpm under load while holding brake
Nissan Mechanic: Jay, Nissan Technician replied 3 years ago
if the catt is clogged dropping the exhaust after it won't change the condition. You want to drop it before the catt
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Customer reply replied 3 years ago
I dropped it before the cat already still same problem
Nissan Mechanic: Jay, Nissan Technician replied 3 years ago
Is the Alpha Moving or is it locked at a 100% at idle?
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Nissan Mechanic: Jay, Nissan Technician replied 3 years ago
Oh .. You mentioned you replaced the MAF sensor didn't you!.... Where did you get it?
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Customer reply replied 3 years ago
Yes st alpha is locked at 100%
I got the maf from a running vehicle same part#same car and engine
Can it be knock sensor?
Nissan Mechanic: Jay, Nissan Technician replied 3 years ago
No, if it's locked that means the 02 sensors are not working either. This sounds like it maybe a after market MAF sensor. They tend to do this and can cause this type of running issue. I would recommend getting a MAF sensor from the dealer, after market ones never work right. After Market MAF sensors never tend to meter air properly and if they do, they lock around 100% and flat line 02 sensor operation which makes you think it's something else when it's the MAF sensor all along. If you have any more questions on this, please feel free to ask. If not, and you're satisfied with my help, please Rate me. I hope I have provided you with Excellent Service. Thanks Jay!
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