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Nissan sentra wont accelerate


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tj210409
Novice

Dec 16, 2013, 2:44 PM

Post #1 of 10 (2781 views)
post icon Nissan sentra wont accelerate Sign In

I have a 98 nissan sentra 1.6L. When I first start my car for the day it doesn't have much issue speeding up. Once it warms up completely it starts to stutter when I try to accelerate and wont go. It struggles to get over 20mph and eventually gets so bad that the gas pedal ceases to work and the car will die. I have to let it sit and get cold before it will restart. No lights on except check engine but the Only code I have coming up is vacuum cut valve bypass valve. I did new spark plugs, crankshaft position sensor and fuel filter. I'm at a loss for what to do next.


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Dec 16, 2013, 2:46 PM

Post #2 of 10 (2780 views)
Re: Nissan sentra wont accelerate Sign In

What is the code number?
How many miles on the car?



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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



tj210409
Novice

Dec 16, 2013, 3:18 PM

Post #3 of 10 (2768 views)
Re: Nissan sentra wont accelerate Sign In

P1491 I checked it out and that code is vacuum cut valve bypass valve malfunction. It just turned over 100,000 miles....


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Dec 16, 2013, 3:34 PM

Post #4 of 10 (2765 views)
Re: Nissan sentra wont accelerate Sign In

I would probably have the exhaust system pressure tested for restrictions. You should see no more than 1 PSI.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



tj210409
Novice

Dec 16, 2013, 6:54 PM

Post #5 of 10 (2756 views)
Re: Nissan sentra wont accelerate Sign In

How do I do that


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Dec 16, 2013, 7:00 PM

Post #6 of 10 (2755 views)
Re: Nissan sentra wont accelerate Sign In

They will remove the upstream 0/2 and install a low scale pressure gauge.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



tj210409
Novice

Dec 17, 2013, 6:17 AM

Post #7 of 10 (2745 views)
Re: Nissan sentra wont accelerate Sign In

Is it something shops do?


Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Dec 17, 2013, 6:24 AM

Post #8 of 10 (2744 views)
Re: Nissan sentra wont accelerate Sign In

Yes. Your symptoms are consistent with a restriction and at least needs to be ruled out BEFORE the converter which is most likely but could be a bent up pipe after the cat/con, T



tj210409
Novice

Dec 17, 2013, 6:38 AM

Post #9 of 10 (2738 views)
Re: Nissan sentra wont accelerate Sign In

Is there any way to check it myself


Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Dec 17, 2013, 7:03 AM

Post #10 of 10 (2737 views)
Re: Nissan sentra wont accelerate Sign In

Do you have a vacuum gauge, assorted hose and "T" fitting available to you? If not stop now and go get this checked for normal backpressure.


If you did and can identify ACTUAL MANIFOLD VACUUM source hose and connect in should read about 18Hg +/- (Hg = inches of mercury) at idle. Deduct 1 Hg for each 1,000 ft of elevation you are at. Then, without load on engine raise RPM to about 2,000 and it should read the same as at idle. Old but telling of a restriction if it reads lower. Some would loosen exhaust before converter and see if power returns just a quick test.


You want to save a buck and understand but if you don't have stuff for testing it's not practical IMO for DIY never mind the fix whatever is found. You can ask for a diagnosis only and decide on doing it or not yourself. You decide that and take the consequences of breaking something for lack of some experience in what the actual problem is.......


Tom


The actual backpressure # is much preferred. As HT said not more than 1 PSI.







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