ENGINE IS SURGING AND WONT IDLE - 1994 Chevrolet S-10 Blazer

Question 1

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1991 GMC C1500, 5.7 liter 350. Why is my A/C and heat are causing my engine to surge?.

If the operation of your A/C and heat is causing your engine to surge in your 1991 GMC C1500 with a 5.7-liter 350 engine, there could be a few possible causes for this issue:

Engine Load: The A/C and heat systems place an additional load on the engine, especially when the compressor engages. This extra load can affect the engine's idle and cause surging. It's possible that the engine is not able to handle the increased load, leading to fluctuations in RPM.
Idle Control System: The idle control system, including the idle air control valve (IAC), may be malfunctioning or not compensating properly for the increased load when the A/C or heat is turned on. This can result in unstable idle and engine surging. The IAC valve may need cleaning or replacement.
Electrical Issues: Faulty electrical connections, such as loose or corroded wires or connectors, can cause intermittent power supply to the A/C and heat systems. In turn, this can lead to fluctuations in engine performance, including surging.
Vacuum Leaks: Check for any vacuum leaks in the A/C and heat system components, as well as the engine's intake manifold and vacuum lines. Vacuum leaks can disrupt the engine's air-to-fuel ratio, leading to unstable idle and surging.
A/C Compressor Issues: The A/C compressor itself may be malfunctioning, causing excessive drag on the engine. This can result in surging when the A/C is engaged. A faulty clutch, compressor bearing, or internal component may be the cause.
Engine Performance Issues: Other underlying engine performance problems, such as ignition system issues, fuel delivery problems, or worn-out engine components, can contribute to surging when the A/C or heat is in use.

To diagnose and resolve the issue, it is recommended to consult a qualified mechanic or an automotive technician who can perform a thorough inspection of your vehicle. They will be able to assess the specific conditions and components involved, perform necessary tests, and identify the root cause of the surging problem.

Jul 10, 2023 • GMC Cars & Trucks

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01 volvo s80 t6 surging when at idle, cleaned Electronic Throttle Control and it got better. Unpluged the map sensor whil running and nothing happened. No change in engine running at all.

No, remove and clean or replace the IAC valve...use trottle body cleaner or brake cleaner..IAC means Idle Air Control...cheers

Nov 14, 2017 • Volvo Cars & Trucks

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Service engine soon light on 171 174 surging idle

Hi try this video it may help you find the fault it covers the codes on 4.0l engine. Ford Explorer 4 0L SOHC Rough Idle P0171 P0174 Lean Codes

Jun 23, 2017 • 2000 Ford Expedition

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Engine pics

throttle position sensor try

If you need further help, I’m available over the phone at https://www.6ya.com/expert/richard_b59056c0c62ecb00

Dec 21, 2013 • Cars & Trucks

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Surging idle

Bad throttle position sensor.

Nov 24, 2013 • GMC Yukon Cars & Trucks

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Got a 99 Nissan Altima 2.4, t-chain broke... replaced head and all t-components... start up surging idle and whistling off idle... engine runs smooth and great power off idle

the surging and whistling sounds like there might be a vacuum leak that is causing this.recheck all vacuum lines and surfaces were this is a gasket that seals a vacuum source.smooth running and good power off idle suggest this leak only affects the motor at a low(idle)rpm.

Apr 14, 2011 • 2005 Nissan Altima

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I'm having a problem with fast idle and surging on a '92 Toyota Paseo, MT. I have found the two lines broken off the BVSV, could this be causing the high idle/surging?

If BVSV is to do with the brake vacuum servo unit, then yes, it could easily be the cause of the high idle speed. This will cause the engine to run lean too, and admit dust and particles into your engine.

Apr 19, 2010 • 1992 Toyota Paseo

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1answer

1990 geo metro engine surges up and down when stopped..... prevous owner told me he turned the idle down. So, is the surging a direct result of idle adjustment or something else? ...and where is the idle...

hi sounds like your engine is surging due to incorrect mixture now your idle screw is on the thottle cable were it connects to the carb and the mixture screw is on the carb body as an approx guide turn the mixture screw fully in then out two and a half turns that should help but y may need to fine ajust later

Nov 15, 2009 • 1990 Geo Metro

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I have a 91' honda civic hatchback and it starts idle surging.

Check and make sure your coolant level is up. If it's up, your idle air control valve is faulty or your cold start solenoid isn't working anymore. Both are activated by the engine water temp.

Feb 15, 2009 • 1990 Honda Civic

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Olds alero 2.4 idle fuel pressure

most likely idle air control sensor or low engine coolant I know sounds funny but IAC uses coolant to regulate idle. Idle air control valve or throttle body positioning sensor.

Dec 10, 2008 • 1999 Oldsmobile Alero

Question 2

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The MOST LIKELY cause of an engine surging and refusing to idle is a vacuum leak. Check all vacuum line connections. You can also pinch rubber vacuum hoses off one at a time near the intake manifold to see if the engine idle changes, - don't forget to check the hose to the brake booster. If pinching off the booster hose fixes the running problem it is possible that the booster itself is leaking if you can't find any leak in the hose.

You can check for vacuum leaks at the intake manifolsd gaskets and throttle body base by squirting some carburetor cleaner around these areas. If you spray this into a vacuum leak area, you will hear a change in engine RPM.

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ENGINE IS SURGING AND WONT IDLE - 1994 Chevrolet S-10 Blazer

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Related Questions:

1991 GMC C1500, 5.7 liter 350. Why is my A/C and heat are causing my engine to surge?.

01 volvo s80 t6 surging when at idle, cleaned Electronic Throttle Control and it got better. Unpluged the map sensor whil running and nothing happened. No change in engine running at all.

Service engine soon light on 171 174 surging idle

Engine pics

Surging idle

Got a 99 Nissan Altima 2.4, t-chain broke... replaced head and all t-components... start up surging idle and whistling off idle... engine runs smooth and great power off idle

I'm having a problem with fast idle and surging on a '92 Toyota Paseo, MT. I have found the two lines broken off the BVSV, could this be causing the high idle/surging?

1990 geo metro engine surges up and down when stopped..... prevous owner told me he turned the idle down. So, is the surging a direct result of idle adjustment or something else? ...and where is the idle...

I have a 91' honda civic hatchback and it starts idle surging.

Olds alero 2.4 idle fuel pressure

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1994 S-10 Blazer

1991 GMC C1500, 5.7 liter 350. Why is my A/C and heat are causing my engine to surge?.

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ENGINE IS SURGING AND WONT IDLE - 1994 Chevrolet S-10 Blazer

1 Answer

Anonymous

Add Your Answer

Attachments: Added items

Related Questions:

1991 GMC C1500, 5.7 liter 350. Why is my A/C and heat are causing my engine to surge?.

01 volvo s80 t6 surging when at idle, cleaned Electronic Throttle Control and it got better. Unpluged the map sensor whil running and nothing happened. No change in engine running at all.

Service engine soon light on 171 174 surging idle

Engine pics

Surging idle

Got a 99 Nissan Altima 2.4, t-chain broke... replaced head and all t-components... start up surging idle and whistling off idle... engine runs smooth and great power off idle

I'm having a problem with fast idle and surging on a '92 Toyota Paseo, MT. I have found the two lines broken off the BVSV, could this be causing the high idle/surging?

1990 geo metro engine surges up and down when stopped..... prevous owner told me he turned the idle down. So, is the surging a direct result of idle adjustment or something else? ...and where is the idle...

I have a 91' honda civic hatchback and it starts idle surging.

Olds alero 2.4 idle fuel pressure

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1994 S-10 Blazer

1991 GMC C1500, 5.7 liter 350. Why is my A/C and heat are causing my engine to surge?.

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