1990 Honda Civic Stalling above idle

Tiny
TNTMARINE
  • MEMBER
  • 1990 HONDA CIVIC
  • 1.6L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 200,000 MILES
Engine stalls above idle unless throttle is pressed SLOWLY. It acts like a carb. Vehicle with a bad accelerator pump. I have replaced fuel pump, fuel filter, pressure regulator, O2 sensor, distributor cap, rotor, spark plugs. No codes flashing on dash or ECU.
Wednesday, December 17th, 2014 AT 12:15 PM

8 Replies

Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
Those symptoms are characteristic of either low fuel pressure or a bad Mass Air flow sensor. I would certainly take a pressure test before assuming that is good.
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Wednesday, December 17th, 2014 AT 1:32 PM
Tiny
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Thanks for the answer. The car runs fine at high RPM 2500 or more, but stalls just above idle. Will check the MAF sensor. I might have more questions. Thanks again.
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Wednesday, December 17th, 2014 AT 8:53 PM
Tiny
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Upon inspection of my 1990 Honda Civic EX, I don't find the MAF sensor located in your photo. Where is it? Thanks.
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Wednesday, December 17th, 2014 AT 9:25 PM
Tiny
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You're right. I checked and in this year they used a MAP sensor instead of a MAF. That still could be the issue but some scan tool testing would be necessary first.
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Thursday, December 18th, 2014 AT 2:10 AM
Tiny
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Thanks for the reply. I have located the reference to the MAP sensor in my Chilton manual #30200, page 4-31, Figure 60, but no picture of where in or on the engine the MAP is located. Do you have a picture or description? Thanks again.
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Thursday, December 18th, 2014 AT 10:03 AM
Tiny
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I believe it's mounted on the firewall.

https://www.2carpros.com/images/external/41935408.gif
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Thursday, December 18th, 2014 AT 11:13 AM
Tiny
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Before I drop another $352 on the Manifold Absolute Pressure Sensor as a "maybe" fix, what are your thoughts about the Throttle Position Sensor possibly being the problem?
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Friday, December 19th, 2014 AT 10:06 AM
Tiny
WRENCHTECH
  • MECHANIC
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Sure, that's possible.

You shouldn't be dropping any money on anything but testing. Throwing parts at it is not the way to approach it.
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Friday, December 19th, 2014 AT 1:51 PM

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