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Car stalls

Tiny
GERALD WISE
  • MEMBER
  • 1993 NISSAN 240SX
  • 2.4L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 70,000 MILES
Car will start and and run very fast for about five seconds and then stall. Pressure on fuel pump is good and fuel pressure regulator checks okay. I also checked injectors with noid light they checked okay. Engine will run very rough if you pump accelerator. But also a lot of black smoke car will start right back up after stalling. Okay, I found that the cruise was stuck causing the fast start. That is fixed. The problem still exist with the car stalling. The fuel pressure at turn of key is 42 psi. Start car and pressure runs at 34 psi. Runs nice for about five to ten seconds and then just shuts off like something turned off the fuel. But car will start right back up.
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Friday, March 3rd, 2017 AT 3:21 PM

13 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,643 POSTS
Hey GERALD,

Please unplug the mass air flow sensor to see if the engine changes. If this sensor is shorted it will cause the mixture to be way off. Also check the air intake tube for leaks/cracks.

Check for vacuum leaks,

https://www.2carpros.com/articles/how-to-use-an-engine-vacuum-gauge

Please run some tests and get back to us so we can continue helping you.

Best, Ken
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Monday, March 6th, 2017 AT 11:45 AM
Tiny
GERALD WISE
  • MEMBER
  • 9 POSTS
Hi Ken Well I unplug the Mass sensor as you suggested and the engine starts right up and runs and as soon as I plug it back in it is dead in the water. It being so old I think I will buy a new one.I really want to thank you for your help. How do I go about sending in a donation. Thanks again Jerry
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Monday, March 6th, 2017 AT 2:28 PM
Tiny
GERALD WISE
  • MEMBER
  • 9 POSTS
Hey Guys I replaced the Mass Air Flow sensor and the car is now running. My only problem now is that I can start it up and I have to give it a little gas untill it warms up and then it will run at about 1400 rpms for a few seconds and then drop down to about 800 rpms for a few seconds and it just keeps this up. It runs great going down the road at about 50 mph. Thanks for your help. Jerry
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Monday, April 3rd, 2017 AT 1:14 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,643 POSTS
It sounds like you have a vacuum leak or a IAC that is dirty, here are two guides that will help you get the problem fixed.

https://www.2carpros.com/articles/how-to-use-an-engine-vacuum-gauge

and

https://www.2carpros.com/articles/how-to-replace-an-idle-speed-control-motor-iac

Please let us know what happens.

Best, Ken
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Monday, April 3rd, 2017 AT 2:00 PM
Tiny
GERALD WISE
  • MEMBER
  • 9 POSTS
I have already replaced the IAC valve motor which is under the intake manifold. So I guess I will be looking for a vac leak. Thanks again
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Monday, April 3rd, 2017 AT 7:50 PM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Have you tried cleaning throttle plate on both sides? Around shaft area so tps willwork good they get sticky/gummy
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Tuesday, April 4th, 2017 AT 6:49 AM
Tiny
GERALD WISE
  • MEMBER
  • 9 POSTS
I will give it a try. Thanks
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Tuesday, April 4th, 2017 AT 3:28 PM
Tiny
GERALD WISE
  • MEMBER
  • 9 POSTS
OK I found my problem. It was the hose off the bottom of the throttle body to the Air maf tube. It was not on all the way causing a air leak. Thanks for your help Guys. It's running like a Scaulded Dog now. As we used to say!
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Thursday, April 6th, 2017 AT 10:36 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,643 POSTS
Glad you could get it fixed please use 2CarPros. Com anytime we are here to help

Best, Ken
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Thursday, April 6th, 2017 AT 4:35 PM
Tiny
GERALD WISE
  • MEMBER
  • 9 POSTS
Well I'm back. I had the car running great until it got warmed up. The Tach started jumping up and down and then stalled. Waited till it cooled down and started right back up. Someone told me it sounded like the crank sensor but I don't know if it's on the top of the trans or on the bottom or if this could be my problem. Thanks for your time
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Thursday, April 13th, 2017 AT 3:41 PM
Tiny
GERALD WISE
  • MEMBER
  • 9 POSTS
OK The car seemed to run fine until it warms up. Then the tach will jump up and down and then stops. What do you feel could be causing this problem.
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Saturday, April 15th, 2017 AT 9:10 PM
Tiny
GERALD WISE
  • MEMBER
  • 9 POSTS
I meant to say the engine stops
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Saturday, April 15th, 2017 AT 9:11 PM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Disconnect the tach wire and see if I t makes a difference then run test described in pic. Also when asking another question please repost not as a reply
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Sunday, April 16th, 2017 AT 8:11 AM

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