Question about 1993 GMC Suburban

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Engine starts runs ruff for 3 to 4 seconds idles upt to 1500 rpm and the runs perfectly but check engine light comes on.

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Hi!!
You should start by scanning the trouble codes. AutoZone, Checkers and similar autoparts stores have this FREE service. Once you'll get the trouble codes and description, come back to us and will help you to fix your vehicle.
A 4 THUMBS rating is appreciated for answering your FREE question. Thank you for using FixYa

Posted on Oct 02, 2010

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Posted on Jan 02, 2017

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1 Answer

Truck dies when idling


HI
first I would like to tell you, do this procedure only if the 5th digit of your VIN is C or K.

Description

The engine control module (ECM) learns the idle position of the throttle plate to ensure the correct idle. Anytime the throttle body is cleaned or replaced, the ECM must learn the new throttle position. The idle may be unstable or a DTC may set if the throttle position is not learned.

Conditions for Running the Throttle Learn Procedure

• DTCs P0101, P0102, P0103, P0107, P0108, P0111, P0112, P0113, P0506, and P0507 are not set.

• The engine speed is between 450-4,000 RPM.

• The manifold absolute pressure (MAP) is greater than 5 kPa.

• The mass air flow (MAF) is greater than 2 g/s.

• The ignition 1 voltage is greater than 10 volts.

Throttle Learn

Important: Do NOT perform this procedure if DTCs are set. Refer to Diagnostic Trouble Code

(DTC) List - Vehicle.

1. Start and idle the engine in PARK for 3 minutes.

2. With a scan tool, monitor desired and actual RPM.

3. The ECM will start to learn the new idle cells and Desired RPM should start to decrease.

4. Ignition OFF for 60 seconds.

5. Start and idle the engine in PARK for 3 minutes.

6. After the 3 minute run time the engine should be idling normal.

Important: During the drive cycle the check engine light may come on with idle speed DTCs. If idle speed codes are set, clear codes so the ECM can continue to learn.

* If the engine idle speed has not been learned the vehicle will need to be driven at

speeds above 70 km/h (44 mph) with several decelerations and extended idles.

7. After the drive cycle, the engine should be idling normally.

* If the engine idle speed has not been learned, turn OFF the ignition for 60 seconds

and repeat step 6.
8. Once the engine speed has returned to normal, clear DTCs.
Good Luck

Mar 04, 2014 | 1995 GMC Sierra

1 Answer

2005 chrysler town and country when i start the van it shaking vibration hard in park and in reverse it and in neutral and in drive it perfect.it drives good on highways no shaking


try to increase the idle-rpm..
Example - at standstil condition when you start your van, have look at rpm... say 1000 or 1200 or 1500.. whatever it may be..
Keep idle-rpm a little bit higher, if previously it was 1200rpm then set it to 1500 rpm..
If the problem is solved then..
1) clean ur airfilter
2) check spark plug condition
good or bad... if bad then replace..
3) check fuel supply line, if it is damaged or folded

Nov 22, 2013 | Cars & Trucks

1 Answer

Idle on start up is ruff oncei drive it is ok?


Anytime the check engine light is on, you should check the computer for trouble codes. The codes will point you in the direction of the problem and what to troubleshoot.

Aug 23, 2012 | 1990 Chevrolet C1500

1 Answer

My cars Idle RPM often remains high in the range of 1500 - 2000 and ocassionally Check Engine light comes on, However Check Engine Light dissapear as soon as cars moves on engine power. Did some one has...


a better question is why is idle so high? could be a vaccum leak or other issue. Adjusting the idle circuit is not the answer. Since the check engine light did come on perhaps you can retrieve a trouble code...maybe even a bad tps

Feb 17, 2011 | 2002 Suzuki Esteem

1 Answer

I have a audi a4 2.0 computer came up with cylinder 4 misfire.swapped coil pack 3 and 4 still same problem. so that eliminates coil pack problem. when you rev the engine to 3000 rpm it clears then when the...


It's the plug wires, I would peek at the engine at night when it is dark,and running to see if you can see a spark jumping across there. I'm surprised the code didn't say plug wires. Hope this helps.

Sep 05, 2010 | 1999 Audi A4

1 Answer

1998 Chev 1500. 305 T.B.injection. Engine runs a little ruff when first started hot or cold but smooths out perfect after about 10 min of running. Check engine light on.


If you haven't already changed plugs and wires, do that first, but i suspect you have an intake gasket or a head gasket leaking. It runs rough when you start it because of coolant in the cylinder. After it clears out and dries, it will run fine. That would especially be the case if you have to add coolant occasionally.

Aug 15, 2010 | 1999 Chevrolet Silverado 1500

1 Answer

Hi I have 2000 BMW 320i. Lumpy idle when cold and oil light for


Your oil is a little low, and the timing may be off a bit but if it smooths out after warm it is probably ljust
low oil.

Jun 29, 2009 | 2000 BMW 3 Series

1 Answer

Engine surges at rpm over 1500


Look for a vacuum leak (lines and intake), Is the engine light on, were any codes present? A faulty EGR or IAC could cause the problem too. Check the throttle cable for any restrictions.

May 27, 2009 | 1996 Chevrolet Cavalier

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