Question about 1986 Chevrolet S-10 Blazer

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When apply throttle at full speed ,engine will die.Also in park will idle proper ,but once apply to drive engine will surge . Then I disconect line from egr and engine no longer surges in drive.

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Sounds like e.g.r. valve is stuck and not fuctioning because of carbon build up, you will have to take off and clean, and clean inside intake where it bolts on, use a shop vac for that, also you can buy a screan gasget at any auto parts store to keep any particals you miss in intake from geting back into e.g.r. valve. this should cure both your problems.

Posted on May 17, 2009

  • curtis mccabe May 22, 2013

    actally, that wasnt my question at all...AT idle, it will surge up then down, the lower it drops te highr it will go, until it bottoms outand dies.

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HI
first I would like to tell you, do this procedure only if the 5th digit of your VIN is C or K.

Description

The engine control module (ECM) learns the idle position of the throttle plate to ensure the correct idle. Anytime the throttle body is cleaned or replaced, the ECM must learn the new throttle position. The idle may be unstable or a DTC may set if the throttle position is not learned.

Conditions for Running the Throttle Learn Procedure

• DTCs P0101, P0102, P0103, P0107, P0108, P0111, P0112, P0113, P0506, and P0507 are not set.

• The engine speed is between 450-4,000 RPM.

• The manifold absolute pressure (MAP) is greater than 5 kPa.

• The mass air flow (MAF) is greater than 2 g/s.

• The ignition 1 voltage is greater than 10 volts.

Throttle Learn

Important: Do NOT perform this procedure if DTCs are set. Refer to Diagnostic Trouble Code

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4. Ignition OFF for 60 seconds.

5. Start and idle the engine in PARK for 3 minutes.

6. After the 3 minute run time the engine should be idling normal.

Important: During the drive cycle the check engine light may come on with idle speed DTCs. If idle speed codes are set, clear codes so the ECM can continue to learn.

* If the engine idle speed has not been learned the vehicle will need to be driven at

speeds above 70 km/h (44 mph) with several decelerations and extended idles.

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