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Misfire and motor dies when you stop or let off the fuel

Tiny
COOPERK1982
  • MEMBER
  • 1993 NISSAN ALTIMA
  • 2.4L
  • 4 CYL
  • 2WD
  • MANUAL
  • 215,000 MILES
93 Nissan Altima 2.4L Idles very rough. Misfires and when driving car stutters and dies when you come to a stop. First I pulled the plug wires to check the plugs which I have already done a full tune up on once before and there was oil in the hole. So I replaced the gaskets, plugs, wires, new fuel filter, cleaned the mass air flow, cleaned the throttle bottle and ran some sea foam through it and still having the same problem. Check engine light has not come on. Cap and rotor have been replaced as well. I would greatly appreciate any ideas you may have.
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Monday, October 5th, 2015 AT 8:09 AM

8 Replies

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Check fuel pressure with a gauge and check for a vacuum leak. Shold be 34 psi at idle with vacuum and 43 without auto parts rent gauge
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Monday, October 5th, 2015 AT 9:38 AM
Tiny
COOPERK1982
  • MEMBER
  • 6 POSTS
No vac leaks. Was thinking it could be pressure regulator, will check fuel pressure and let you know what I find. What do you think about the possibility of it being the IAC valve?
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Monday, October 5th, 2015 AT 10:02 AM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
The iac valve shouldn't make it run rough it's usually low fuel pressure or a misfire so scan for codes too.
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Monday, October 5th, 2015 AT 1:11 PM
Tiny
COOPERK1982
  • MEMBER
  • 6 POSTS
I cant find the check valve for the fuel pressure. I'm looking along the fuel rail but I do not see it.
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Monday, October 5th, 2015 AT 1:15 PM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
I think you mean regulator see pic it has a vacuum line going to it. Ther eis no pic just explanation of where it is.
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Monday, October 5th, 2015 AT 3:25 PM
Tiny
COOPERK1982
  • MEMBER
  • 6 POSTS
Ok fuel pressure checks out. Think it could ignition coil maybe? Not sure where to look at this point.
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Friday, October 9th, 2015 AT 6:11 AM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Check compression and then clean throttle plate on both sides and iac hole with choke cleaner. Other than that I have no other commentst.
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Friday, October 9th, 2015 AT 7:14 AM
Tiny
COOPERK1982
  • MEMBER
  • 6 POSTS
Already cleaned throttle body. I will check compression and clean out the IAC hole. Thanks for all your help. Hopefuly this works cause I dont want to get rid of it because its been a good car with great gas mileage.
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Friday, October 9th, 2015 AT 7:59 AM

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