1992 Toyota Celica Car stalls at idle.

TEHKRYPTYK

MEMBER
1992 TOYOTA CELICA
4 CYL
FWD
AUTOMATIC
100,000 MILES

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.

5 Replies

KHLOW2008

MECHANIC
41,814 POSTS

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.

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Friday, March 6th, 2009 AT 6:37 AM

TEHKRYPTYK

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4 POSTS

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.

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Friday, March 6th, 2009 AT 2:15 PM

KHLOW2008

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41,814 POSTS

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.

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Saturday, March 7th, 2009 AT 5:50 AM

TEHKRYPTYK

MEMBER
4 POSTS

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.

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Sunday, March 8th, 2009 AT 9:48 PM

KHLOW2008

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41,814 POSTS

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.