Question about 1991 Chevrolet S-10 Blazer

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Will not hold idle when in drive or reverse 1991 S10 Blazer

Have replaced idle air control sensor (IAC) and collant temp sensor (CTS). No check engine lights or codes. will work if idle is set high. Have checked fuel filter and (TPS) both seem to be fine.

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Well Boys
If I tell you how to fix the S10 Problem are you going to send me $10.00Regard.

Regards,

Posted on Nov 28, 2008

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Idles rough 1991 Nissan truck


Tune up, EGR valve dirty, collant temp sensor bad, IAC dirty.

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COULD THE GAS PEDAL CABLE CAUSE THIS CODED PO507 to be high


Extracted from Engine-Codes.com

Code P0507

Possible causes

- Dirty throttle body

- Electric throttle control actuator misadjusted or damaged

- Faulty Electric throttle control actuator

- Intake air leak

- Poor electrical connection to the Intake Air Control (IAC) valve


help.jpg What does this mean?

Tech notes

If there are no intake leaks, clean throttle body, adjust engine idle and erase engine code. If the code comes back you may have to replaced the Electric Throttle Control Actuator (Motor) to repair the problem.



There is a factory service bulletin for the following Chevrolet models:



2006-2008 Chevrolet Trail Blazer

2007-2008 Chevrolet Avalanche

2007-2008 Chevrolet Express

2007-2008 Chevrolet Silverado

2007-2008 Chevrolet Suburban

2007-2008 Chevrolet Tahoe

Chevrolet Factory Service Bulletin OBDII Code P0507


What does this mean?

When is the code detected?

Thi P0507 code sets when the Powertrain Control Module (PCM) detects an engine speed outside of the Idle Air Control (IAC) valve range of control.

Possible symptoms

- Engine Light ON (or Service Engine Soon Warning Light)

- Engine hard to start

- Rough or erratic idle speed

P0507 Chevrolet Description

The Idle Air Control (IAC) valve is a Powertrain Control Module (PCM) controlled stepper motor located on the throttle body. The stepper motor drives a valve pintle which protrudes into a passage that bypasses the throttle plates. The PCM commands the IAC valve pintle to extend to decrease the idle speed. The bypass air flow is reduced and the idle speed decreases as the pintle approaches its seat. The PCM retracts the IAC valve pintle away from its seat to increase the idle speed. The retracting of the IAC valve pintle allows more air to bypass the throttle plates. One of the PCMs uses for the IAC system is to maintain a desired idle speed. This DTC sets when the PCM detects an engine speed outside of the IAC\'s range of control.





Read more: http://engine-codes.com/p0507_chevrolet.html#ixzz3ObdI2chF

Jan 11, 2015 | 2001 Chevrolet Blazer

1 Answer

1994 chevy s10 blazer sputtering and dies


Check the IAC (Idle Air Control Valve) and the TPS (Throttle Position Sensor) they are a very common issue on that truck

Feb 25, 2013 | 1994 Chevrolet S-10 Blazer

1 Answer

'93 chevy S-10 Blazer 4wd (automatic) high idle & I have already replaced the idle air control/throttle positioning sensor & have checked for vaccuum leaks. (none of the above have fixed the...


dont know if this will help but have you replaced the coolant sensor (by the thermostat ) and the pigtail that connects it to the wiring also the map sensor may be part of the problem my 92 s10 did some what of the same thing and I replaced the temp sensor and that didnt fix it untill I put a new pigtail that connects to the wireing my son had a blazer that also did that I think ( its been a while ago ) and we replaced the map sensor and that fixed it

Sep 17, 2011 | 1993 Chevrolet S-10 Blazer

1 Answer

1995 Blazer with Vortec V-6 was running fine until 4 days ago. Check engine light came on, now it starts and idles fine, but when placed in gear, idle drops, engine bogs and dies. I am targeting the Idle...


IAC idler air control valve bumps up the RPM and doesnot let the engine to die, how ever if its not the IAC then Ide be looking at the TEMP sensor which migh have a fair line crack or may be the MAF mass air flow sensor might be bad, seems like the engine is not geting air, check the air filter first.

Feb 28, 2011 | 1995 Chevrolet Blazer

1 Answer

Need location of coolant temp sensor so it can be replaced


Here it a pic of the CTS for the computercoolant temp sensor
engine.jpg


(1) EVAP Canister Purge Solenoid
(2) Fuel Pulse Dampener
(3) Fuel Rail with Injectors
(4) Crankcase Vent
(5) Left Bank Ignition Coils/Modules
(6) Left Bank HO2S Sensor 1
(7) Engine Coolant Temperature (ECT) Sensor
(8) Fuel Pressure Gauge Test Connector
(9) Throttle Position (TP) Sensor
(10) Idle Air Control (IAC)
hope it helps if you need more info just ask!dont forget to vote on the answer thanks have a good day DB

Aug 19, 2010 | 1999 Pontiac Firebird

1 Answer

My 1997 blazer idles real high all the time, costing me gas. what sensor would control this problem. Is this sensor inside the motor or on the block or manifold.


Check your IAC (Idle Air Control) valve or MAF sensor.
CLICK HERE to read more.

MAF sensor is located Under hood, driver side, front engine area, behind air cleaner housing, mounted in air intake duct. $175 new $100 remanuf.

IAC is $84.99 and should be on top rear of engine - driver's side


b1b5e2e.jpg Thanks for using FixYa - a VERY HELPFUL rating is appreciated for answering your FREE question.

Jul 13, 2009 | 1997 Chevrolet Blazer

1 Answer

No idle wants to die


IAC or idle air control behind the throttle body may be at fault. any check engine light on? Advance Auto will diagnose check engine light for free.

Apr 21, 2009 | 2004 Dodge Ram 1500

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