1992 Toyota Celica Car stalls at idle.

1992 TOYOTA CELICA
100,000 MILES • 4 CYL • FWD • AUTOMATIC
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TEHKRYPTYK
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The car starts but won't idle. If I give it gas it will rev up, but it feels like it's missing. I checked for spark at the plugs, and all of them spark intermittently (like 1 or 2 times a second when I crank it). I put in new plugs, wires, cap, rotor, and coil. Still the same problem.
Mar 6, 2009 at 12:31 AM
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KHLOW2008
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Hi tehkryptyk, Thank you for the donation. Problem seems to be idling related and not a starting problem. Can you keep the engine running with accelerator pedal depressed? If it is idling problem, here is a checklist.


https://www.2carpros.com/forum/automotive_pictures/192750_Stall92Celica_1.jpg

Mar 6, 2009 at 6:37 AM
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TEHKRYPTYK
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I can keep the car running if I hold the accelerator pedal down, but it feels like it is missing. If I let the RPMs drop below 2000 the engine will stall.

-Update-
I just had a buddy help me double check some things. The plugs are firing more than I thought. They seem to bee firing like they should. Also, he noted a hissing sound coming from the throttle body. We pulled the intake off and it is quite loud. Tested the resistance on the IACV B+ to ISCO is 22.5 Ohms and B+ to ISCV is 25.2 Ohms.
Mar 6, 2009 at 2:15 PM
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KHLOW2008
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Is the Check Engine Light indicating when engine is running?

What is the engine model code? 4AF-E ?

With air intake off and engine running at more than 2000 rpm, there would be a loud hissing noise as air is being sucked into the cylinders.

Standard resistance for test should be 19.3 to 22.3 ohms. Seems the specs is slightly out.
Mar 7, 2009 at 5:50 AM
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TEHKRYPTYK
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No check engine light, only code that comes up is IAT sensor malfunction (because I unhooked it with the intake). Engine is a 5S-FE 2.2 federal. I went back through and checked a few things. A friend suggested a vacuum leak. I capped off the line to the MAP sensor and the outlet from the manifold and the car ran smoother but started to back fire. Does this mean a vacuum leak or bad Map sensor, or what?

I appreciate all the help.
Mar 8, 2009 at 9:48 PM
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KHLOW2008
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By disabling the MAP sensor, the ECM would provide backup data for running the engine so it would misfire at times.

Since vehicle is equipped with MAP sensor, any vacumn leakage should incerase the rpm and cause surging instead of stalling. The problem i most likely a faulty MAP.
Mar 10, 2009 at 12:18 PM