Question about GMC Sierra 2500

1 Answer

My cng truck runs fine on nat gas,when switched back to unleaded gas truck stalls,what is the fault ,how is the two computers controlled,what deos the switch turn off.

Posted by on

1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

    Vice President:

    An expert whose answer got voted for 100 times.

  • Master
  • 850 Answers

Tune up for gas is different in the timing compared to lead or unleaded fuel by upto 12 degrees
the two computers control the engine management & the transmission
when you switch between nat gas & fuel a solenoide is activated to block ether so they cant mix
if they did mix your gas would freeze the fuel & you would see the fuel pipes start to get iced up
Cheers Rob

Posted on Jul 29, 2009

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
goodluck!

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

2000 gmc savanna, Van starts up fine but when I get to a stop it will stall sometimes and the other times it will act like it wants to stall when I give it gas, runs great when it gets going


The first thing you need to do here is have the computer control system scanned for fault codes and an have a engine running test done to see what is going on in the automatic idle speed control system.

Oct 26, 2016 | 2000 GMC Savana

1 Answer

Code P1388 and P1399


P1388 JEEP - ASD or CNG (compressed Gas) Relay Control Circuit Possible causes - Faulty ASD Relay (most common cause)
- Faulty CNG Relay
- ASD or CNG Relay harness is open or shorted
- ASD or CNG Relay circuit poor electrical connection
- ASD or CNG Relay poor ground or supply voltage condition

P1399 is a related to the P1388 failure.

Jun 27, 2016 | 2000 Jeep Grand Cherokee

2 Answers

2005 mercury montego starts but will stall out


Hello
The engine and transmission in this cars drive train are fully electronically controlled by a computer called the PCM (Power Train Control Module). Whenever a problem like this occurs the computer stores a record of the problem (there are of course some exceptions to this, like the fuel pump for instance) in the form of a fault code in its memory, to read these fault codes you must have the systems memory scanned with a special tool. Once the fault code(s) are read you then must perform the appropriate diagnostic testing to find and resolve the problem(s) DO NOT REPLACE ANY PARTS UNTIL THE DIAGNOSIS & TESTING IS COMPLETED.

Jul 12, 2012 | 2005 Mercury Montego

1 Answer

Were is the mass airflow sensor in a 1999 doge intrepid


Mass Airflow sensor is attached to the air breather system usually near the air filter. Its usaully a square box looking thing with a wiring harness on it. Here is a pic of one below, but keep in mind this is not a pic of one from a intrepid

2_7_2012_8_37_37_pm.jpg

Feb 07, 2012 | 2003 Nissan Altima

2 Answers

I mistakenly put a regular gas in it when its an UNLEADED FUEL only model an automatic 1994 geo tracker


Hi!!
At the pump, when it says Regular, it means Regular Unleaded Gasoline, the one that says Super, is Super Unleaded Gasoline, the only difference between the two is the octane rating. Both will work just fine on your vehicle.
Good Day! Don't forget to rate this post!!

Sep 20, 2010 | 1994 Geo Tracker

2 Answers

NO POWER WHEN ACCELERATING, STALLS OUT , TROUBLE STARTING RUNNING SLUGGISHLY. ALREADY CHECKED ONE FUEL SENSOR, AND CO2 SENSOR.


Replace the fuel filter on van and check the spark plugs for a fouling condition. If the van in question has not been serviced in a while you might think of doing it to correct your problems. Check all the filters and replace spark plugs. Hope this will help you.

May 24, 2010 | 1992 Dodge Caravan

1 Answer

Stumbling idle, stalls when throttle opens


If the car is running that bad the check engine light should be on and code/s stored in the pcm along with a snapshot of what is going on at the time the code is set. A possible solution is to check the Mass Airflow Sensor or the MAP (manifold absolute pressure) sensor depending on which your vehicle is equipped with. The engine may run until the engine computer switches to closed loop fuel control (means its warmed up and the pcm is in control of the fuel trim) and then stall upon accel. Be sure you have checked all the basics first.

Apr 18, 2009 | 2000 Suzuki Esteem

1 Answer

Honda Civic 1995 Ex - KNOCKING on CNG


clean your air filter and try it .... normally on CNG at low Rpms it has unstable running



Oct 18, 2008 | 1995 Honda Civic

6 Answers

Right gas


Regular unleaded (87 octane) is the correct grade.

Jun 15, 2008 | 2000 Nissan Maxima

Not finding what you are looking for?
Cars & Trucks Logo

Related Topics:

71 people viewed this question

Ask a Question

Usually answered in minutes!

Top GMC Experts

yadayada
yadayada

Level 3 Expert

74896 Answers

Freddy

Level 3 Expert

1311 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22095 Answers

Are you a GMC Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...