Question about 1989 Chevrolet S-10 Blazer

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Why does my 1989 chevrolet s10 surge and idle up

Why does my 1989 chevrolet s10 truck surge when i drive and why does it idle up and down all the time even when its just sitting there idling

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You may have a bad idle air control valve, I would also check for a vacuum leak, from a vacuum hose or a broken vacuum tee.

Posted on Jul 14, 2010

Testimonial: "thanks for the advise i will check the iddle control valve "

  • backwoodzjdu Oct 20, 2010

    could be cloged fuel filter, cheap fix

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1995. WHEN I START IT IDLES NORMAL BUT SURGES BUT IF I DONT TAKE OFF IT CLICKS AND IDLES MUCH FASTER BUT AFTER I AM ON THE ROAD IT RUNS GREAT NEED SOME HELP WHAT CAN I TRY


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1989 cevrolet s10 4 cylinder 2.5 engine idles idles to high for to long when first started


check the setting on the automatic choke . loosen the 3 screws on the mounting ring and turn the cap a few points to allow the choke to come off earlier.. If it is heated by pipes from the manifold ensure that the hot air is getting to the choke operating bi-metal spring. If electric ensure that the current is getting to the heater in the cap.

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Go to your local shucks or auto zone and they can check any codes behind your check engine light and it's free. It sounds like one of two things a O2 sensor or your mass airflow sensor but they will tell you for sure

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The idle on that model is computer controlled & non adjustable.You might try cleaning the idle air controll circut on the throttle body with carb cleaner.Good luck,
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1 Answer

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Hi! I had the same problem with my 88 2.8 Ltr. Had dirty fuel Injectors. Put in fuel Inj. cleaner in gas tank, after a couple of days, runs like a dream,no more problems. Give it a try. Take care,Leo B. Flushme@shaw.ca

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Engine pulsates during idle and from second to third gear


Try checking for vaccum leaks, use carb cleaner and spray it around the base of carb, vaccum hoses, edges of intake manifold, take pliers and squeeze the big line to brake power booster & see if it changes, pull the pcv valve out and cover with your finger see if it changes idle.

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