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#1
11-14-2011, 09:28 PM
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1993 1.8L cold start issue
I have a 1993 corolla that runs fine once warm. The problem is a cold idle problem. When starting it cold, it dies unless you feather the throttle. I can keep it running by feathering the throttle until it warms up. Once warm it runs fine. If I let off of the throttle at all during the warmup period, it dies instantly. How does the choke work on these vehicles? Could it be a IACV problem? Anything else it could be?
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#2
11-16-2011, 10:13 AM
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Re: 1993 1.8L cold start issue
I would definitely check the Idle Air Control (IAC) valve for operation. You can remove and spray the mechanical plunger to remove any build-up, but don't try to compress the plunger. If you do you could break the servo motor or small teeth that move the plunger. And don't spray the electrical portion that is outside the throttle body (TB). Also spray down the plunger seat in the TB.
Another possibility is the engine coolant temperature (ECT) sensor is faulty. This can make the engine's computer think the temp is hot when it isn't. Test for continuity and correct operation...it's located just before the uppper radiator hose connects to the engine.
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Current Garage: 2009 Honda CR-V EX 2006 Mazda 3i 2004 Chevrolet Silverado 2500HD 2003 GMC Envoy XL 2000 Honda ST1100 2000 Pontiac Sunfire Vehicle History: 2003 Pontiac Vibe AWD - 1999 Acura Integra GS - 2004 4.7L Dakota Quad Cab 4x4 - 1996 GMC Jimmy 4wd - 1995 Chevrolet C2500 - 1992 Toyota Camry LE 2.2L - 1992 Chevrolet S10 Ext. Cab 4.3L - 1995 Honda ST1100 - 1980 Yamaha XS400 - 1980 Mercury Bobcat.
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#3
11-16-2011, 12:39 PM
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Re: 1993 1.8L cold start issue
What is the typical resistance value I should read? 1-10 ohms or something like that?
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#4
11-16-2011, 01:30 PM
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Re: 1993 1.8L cold start issue
Test the resistance hot and cold. There should be a significant difference between them. Although I don't have a manual for the engine, a Camry 4-cylinder engine would have resistances of 2-4 kohms cold and around 0.2-0.4 kohms hot.
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Forum Guidelines:http://www.automotiveforums.com/vbulletin/guidelines.html "What we've got here is a failure to communicate"
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#5
11-18-2011, 01:34 PM
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Re: 1993 1.8L cold start issue
Checked the resistance. Hot it gets to .4K, cold it will get to 5K. Seems to be OK. On a side note I pulled the connector off and stuck a 4k resistor in and the idle kicked up to 1400 like I would expect. Put it back on the Temp sense and it still ran horrible. Once the car is warm I noticed that turning on the lights the idle drops hard and struggles to recover. It eventually does though.
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#6
11-18-2011, 05:36 PM
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Re: 1993 1.8L cold start issue
Your experiment with the resistor seems to indicate the ECT sensor or connector is the problem. If the ECM was seeing 4 kOhms from the sensor, the engine would run like you saw it run with the resistor if the engine was cold. Double check the connection to the sensor. It may not be making a good connection - corrosion, bent parts in the connector, etc.
Do you have a cold-start injector? If so, there are 3 or 4 parts in that circuit that could cause this problem.
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Forum Guidelines:http://www.automotiveforums.com/vbulletin/guidelines.html "What we've got here is a failure to communicate"
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