Question about 1991 Chevrolet S-10

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1991 S10 2.5L throttle body idles to fast

1991 S10 2.5L throttle body idles too fast. Vacuum lines match the diagram located on top of radiator.

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A vehicle that old will suffer from brittle and cracked vacuum lines. I would say there is a bad, or several bad lines leaking away vacuum from the intake manifold. Don't forget to check the hose going to the PCV on the valve cover. A vacuum leak will also cause the engine to stumble and miss intermittently when idling.

Posted on Jun 26, 2009

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R & R motor and where do the vacum lines


There re few direct links showing exact vacuum line diagrams.I suggest you to refer the direct links.

Click the link below:-----
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How to locate the vacuum leak? http://howtobyme.blogspot.in/2012/01/how-to-locate-vacuum-leak.html

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Vacuum Hose Routing Diagram For 1995 Chevrolet Corvette Throttle Body?

http://schematicsdiagram.blogspot.com/2011/12/vacuum-hose-routing-diagram-for-1995.html

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VACUUM DIAGRAMS For Audi A4?

http://repairhelpcenter.blogspot.com/2011/11/vacuum-diagrams-for-audi-a4.html

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VACUUM DIAGRAMS For VW Passat? http://vwrepairhelp.blogspot.com/2011/11/vacuum-diagrams-for-vw-passt.html
------------- Vacuum line diagram For 1996 Chevrolet Lumina? http://schematicsdiagram.blogspot.com/2011/12/vacuum-line-diagram-for-1996-chevrolet.html
-------------- Vacuum Hose Routing Diagram For 1995 Chevrolet Corvette Throttle Body? http://schematicsdiagram.blogspot.com/2011/12/vacuum-hose-routing-diagram-for-1995.html
------------- Vacuum diagram for Isuzu? http://technoanswers.blogspot.com/2012/01/vacuum-diagram-for-isuzu.html


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Ford 4 wheel drive vacuum solenoid working system? http://technoanswers.blogspot.in/2012/02/ford-4-wheel-drive-vacuum-solenoid.html

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These will help.
Thanks.

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1 Answer

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To me it sounds like the (fuel pressure valve) located on the end of the fuel rail, by the throttle body, also check vacuum line.

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My 1991 Celica GTS has a fast idle even when the engine is warm. I have already turned the idle adjust screw all the way down.


The idle on these is controlled electronically by an IAC solenoid (idle air control). Adjusting the screw will not do anything to adjust your idle down. Chances are you could have a vacuum leak, or a faulty IAC solenoid. I would start by checking for vacuum leaks.

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There are couple of things I would check out that would cause this problem.

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2. The air tube that goes from the Mass Air Flow Sensor to the throttle body. Check for leaks that would bypass air from going through the Mass Air Flow Sensor.

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if this is a throttle body motor which probably is check for vacuum leak were the throttle body bolts on to the intake .the gaskets go bad after awhile .or listen to here a hissing sound try to locate and you might find a vacuum leak there.

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The most common cause of this is a air pocket in the cooling system, If you've done a coolant flush, changed a hose, radiator, etc..Im not saying that every honda that has a surging idle has this problem but I've worked at a honda dealership for over 10 years and I see this quite often. Let the car idle with the cap off for a while and if that still doesnt do it, jacking up the car as high as you can on the left side while its idling works too..theres a 25 tool thats basically just a funnel that stops this problem if you do alot of your own mechanical work.

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1 Answer

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You may need to adjust your TPS. That is the little black box that hangs off the side of the throttle body.

It should be adjusted so that the switch opens as the TB cracks open.

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