Question about 1988 Chevrolet K1500

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Truck idles at @1100rpm

Truck idles at @1100 rpm have checked for vaccum leaks changed base gasket changed egr map and still same what am i missing

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1988 chevrolet pickup 3/4 ton k2500 clubcab will not idle down

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Will try this solution in the am on wed very thankful for the help

Posted on Sep 23, 2008

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Is the check engine light on and if so what are the codes
on that model check to see if the map is getting vacuum if it is not getting vacuum the map sensor port at the throttle body is plugged very common

Posted on Sep 23, 2008

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Posted on Jan 02, 2017

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My sirion 2003 the idle speed not steady some times 1000 rpm 1100rpm some times 1200 rpm and not going down . When i remove the battery cable and reconnect it the idle speed become normal but only for few...

Did you clean or replace the iac valve?? If so,start inspecting all vacuum hoses & fittings,gaskets and components that operate off of vacuum.If you cant locate a leak visually, connect a 1' long piece of rubber hose to the valve on a small,handheld propane torch.Open the valve slightly so propane comes out,start the engine and let it idle then run the hose across all of the components listed above.If the engine idle surges upwards,the component you just passed over has a leak.
A defective tps can also cause a high or flucuating idle.

Jan 20, 2018 | Cars & Trucks

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1991 Chevy Caprice has a mild miss fire and stall at low rpm: This is my latest update: I checked and cleaned the EGR,PCV,IAC valve, M.A.P sensor and Throttle body(bore/butterfly). with carb cleaner....

Do you have the idle speed turned up to keep it from dying? Because it is high. Check engine light on? Have you checked for vacuum leaks at the gasket under the throttle body? How does the car run under acceleration? You might have a worn distributor shaft.

Jun 22, 2010 | 1991 Chevrolet Caprice

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1988 F-150 4.9 six. Pulled codes and it showed egr valve was not closing. Changed egr valve and now when driving there is a miss when engine warms up. Did not have the miss before I changed egr valve.

Check to make sure you didn't accidentally loosen a spark plug wire or broke/disconnected a vacuum hose.

A trick you can try; spray WD40 around the area you were working in, and see if the idle changes. If the idle changes then the problem is associated with a vacuum leak in that area....look for loose/cracked vacuum line.


Nov 20, 2009 | 1988 Ford F 150

4 Answers

Im having ERG problems. Vaccum leak somewhere. Check engine light came on. check all around the engine for hoses off. could not find any.

Check for

vacuum leaks on intake manifold,

the air tube between the air filter.

intake manifold vacuum hose.

clean throttle plate with Berryman carburator cleaner

SEE sample picture HERE

Also remove carbon built up behind the EGR valve and the EGR passage tube.


Vacuum leak WILL offset the intended 14.7 to 1 air fuel ratio.

More un-metered air (leaks) will lean out the fuel mixture.

Use small amount of Berryman carb clearer at potential air leak area will help you identify trouble spot.

At idle,just spray and listen for the RPM surge.

The in-rush of carb clearer will increase the RPM on the motor.

Record the problem spot(s) and address it later.


EGR carbon built up require 2+ hours to clean from start to finish.

You will need a new EGR base gasket before your start.

Locate and remove the EGR valve after the vehicle is cool down.

Carefully record the connector and vacuum line (for older vehicle) location by drawing an easily to follow diagram.

Remove the EGR valve.

Inspect the location of the carbon built-up inside the valve and the EGR passage tube.

SOAK these areas with WD-40 spary.

You will need a small screwdriver,cloth hanger and lot of newspaper and time to get this cleaning done right.

RE-SOAK the carbon and let it sit for over-night will also help.

One the last round,pass a shop vacuum of the EGR valve and the passage pipe.

Install the new EGR gasket and connectors.

Allow the vehicle to warm up outdoor to burn up any remaining WD-40.

Take it for a test drive.

Please rate my answer if it's useful to you.



Sep 21, 2009 | 2000 Mazda 626

1 Answer

Engine starts,reaches high rpm,then slowly returns to a rough idle, misses badly,no backfire,surges as if searching/adjusting air/ fuel/est,timing light shows mark constantly changing/erratic,engine then...

Vacuum leaks. Check all hoses and intake bolts. Leaking EGR or plugged PCV valve. Air filter plugged. Leaking head gasket. Worn timing chain. Camshaft lobes worn. Valves burned or leaking. Fuel idle control system or sensor. Good luck!

Apr 18, 2009 | 1991 Chevrolet Camaro

2 Answers


Check for vaccume leaks and also you PCV valve. check the hose too. Visually inspect every vaccume hose you can find. Sounds like a leak .

Oct 30, 2008 | 2002 Nissan Sentra

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