1994 Chevy S-10 stalls

SYNERGYTECH

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1994 CHEVROLET S-10
6 CYL
2WD
AUTOMATIC
93,000 MILES

My 94 s10 runs good at highway speeds, fast acceleration between 70 and 80, but when coming to a stop, when it reaches a certain low rpm it dies and at that point it takes starting fluid to restart unless it sets for awhile.I installed a new fuel pump, filter and regulator, no codes are showing but 12, it never malfunctions at running speeds.I don't think any parts I installed were really needed.

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WRENCHTECH

MECHANIC
20,757 POSTS

Is this a Vortec engine?

You can tell by the 8th digit of the VIN#
It will be a "W" or a "Z"

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Tuesday, August 17th, 2010 AT 7:42 AM

SYNERGYTECH

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The eighth number is a Z

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Tuesday, August 17th, 2010 AT 4:58 PM

WRENCHTECH

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That means you have a low pressure TBI fuel injection system. The only thing I could suggest is to check the EGR valve for any carbon holding it open. If it was just stalling I would say clean the throttle body and replace the IAC but that won't do anything for the hard starting problem. Double check your fuel pressure. It should be 9 to 13 PSI.

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Tuesday, August 17th, 2010 AT 5:19 PM

SYNERGYTECH

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It has very snappy acceleration at highway speeds, this system has no schrader valve for checking the fuel pressure, I forget to mention it also has a new IAC valve that made no difference.I will however take a look at the egr valve.I checked the injectors with a light and they do not pulse at all while cranking after the engine has died unless it has cooled down for a while.

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Tuesday, August 17th, 2010 AT 8:41 PM

WRENCHTECH

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That tells us a lot. If your getting no pulse, then your likely looking at an ECM problem or a shorted fuel injector that's overloading the quad drivers in the ECM.