Question about 1994 GMC Sierra

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Truck is backfiring and missfiring.

My truck backfires after decelerating on the highway and is missfiring. ive been told it is because the timing and needs a tune up. ive also been told its the fuel pump.

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  • 216 Answers

Have the misfire diagnosed and the backfiring will be fixed also. The backfiring is caused by the "over-rich" fuel mixture in the exhaust stream and is igniting within the exhaust. Fix the misfire (which will cause the rich condition) and the backfire will be gone.

Posted on Apr 27, 2014

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Posted on Jan 02, 2017

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SOURCE: Truck broke down wont start.

There is no Inercia Switch to reset Like Ford
Have you Double Checked All Underbody wiring for fuel pump ,OPEN In Pink/blk tracer fuel power lead,also
Oil Sending unit on most GM Vehicles have the ability to turn OFF GROUND to Fuel Pump Relay as a Proyection Against LOW OIL Pressure in engine.


Fuel Cutoff Mode
The PCM cuts OFF fuel from the fuel injectors when the following conditions are met in order to protect the powertrain from damage and improve driveability:

  • The ignition is OFF. This prevents engine run-on.
  • The ignition is ON but there is no ignition reference signal. This prevents flooding or backfiring.
  • The engine speed is too high, above red line.
  • The vehicle speed is too high, above rated tire speed.
  • During an extended, high speed, closed throttle coast down-This reduces emissions and increases engine braking.
  • During extended deceleration, in order to prevent damage to the catalytic converters

Posted on Jan 26, 2009

  • 90 Answers

SOURCE: hard start when air temp is cold, backfires when warm

Try this, remove (MAF) Mas Air Flow sensor,(be sure key is OFF) so you don't set a trouble code when disconecting wire conector, with some throttle body/air intake cleaner from the outlet side of MAF, spray the sensor clean, let dry, reassemble.Remove snorkle from throttle body, and with a old tooth brush, clean throttle body& plate with cleaner, may take a couple of cans if throttle is badly 'coked' up. Hope this helps.

Posted on Feb 01, 2009

haider_alhar
  • 90 Answers

SOURCE: why does my 1998 gmc truck backfire and stutter sometimes stall when driving

my friend the car backfires if its runing lean ( insufficient fuel ) or runing rich ( insufficient oxygen ) this mostly in carbourated cars would make incomplete compustion . in engine with fuel injuction there may be a leak in the intake valve that makes the fuel to burn in the exhaust pipe . so check for leak asap

Posted on May 29, 2009

dennymulford
  • 1055 Answers

SOURCE: backfiring through exhaust

you may need too replace the timing gear!!!!!!

Posted on Jun 06, 2009

  • 74 Answers

SOURCE: just put new timing kit on 95 gmc sonoma 2.2liter

click the ignition so #1 cylinder is at top dead center then pull youre distributer cap off make sure the rotor is pointing towards # 1 cylinder if not you re timing is 180 deg off pull the distributer out a little and turn the rotor to # 1 cyl you probaly dont have the timing marks lined up correct if the timing is off it will back fire either out the air filter or exhaulst ..

Posted on Nov 13, 2009

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94mazdaB2300 2.3 Has No power,backfires,running rich.R&R plugs,wires,timing belt,coil pack,02 sensor,feedback sensor,massairflow,catalytic converter. Still runs bad


Check the vacuum hoses.

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Truck backfires at even throttle


check for leaking injectors and vacuum leaks as there is fuel getting into the exhaust system and igniting. check ignition timing as it may be retarded too far.

Mar 23, 2014 | 1996 GMC Sierra

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2002 neon revs up to 4000rpms at start and idles up an ddown 1500rpms-2000rpms after. and begins to backfire near engine .


Engine system needs inspection on case of backfire:-----


Check out related help links to troubleshoot the vehicle backfire issues:-----

Feels like backfire from engine when decelerating?

http://schematicsdiagram.blogspot.in/2012/02/feels-like-backfire-from-engine-when.html


-------------

Jeep Backfires?

http://technoanswers.blogspot.in/2012/02/jeep-backfires.html


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Nissan Pathfinder stalls and bucks on Acceleration?

http://technoanswers.blogspot.in/2012/02/nissan-pathfinder-stalls-and-bucks-on.html

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Nissan Pathfinder Backfires?

http://technoanswers.blogspot.in/2012/02/nissan-pathfinder-backfires.html
----------
These will help.
Thanks.

Nov 28, 2012 | 1995 Honda Accord

1 Answer

Its a 1995 eclipse gs. Cranks but doesnt start. The fuel pump kicks in and fuel rail has gas flowing. Its just backfires and sounds bad in general. Ive had several people look at it and no one can so


There are few possibilities that cause such problems.
No start problem,backfire issues.
I suggest you few help links related to these issues.

Car not starting or turning over indicates towards multiple possibilities. It can be issue with battery or weak battery. But if battery checks out ok, then it can be starter issue or faulty alternator or problem with low fuel pressure or no spark at spark plugs due to dirty spark plugs or faulty ignition coil or injectors getting cracked or dirty and needs to be cleaned.


To confirm the problem, the basic troubleshooting is required.


Click this link below and follow the troubleshooting:------
http://technoanswers.blogspot.in/2012/02/car-starting-issues.html

-----------
Headlights flickering and car hesitates to start? http://howtobyme.blogspot.in/2012/02/headlights-flickering-and-car-hesitates.html

---------
Starts fine but dies in few seconds?


http://howtobyme.blogspot.in/2012/05/1994-toyota-pickup-starts-fine-but-dies.html

--------
Turns over but not start? http://whatisbyme.blogspot.in/2012/05/1989-toyota-pickup-truck-turns-over-but.html

-----------
Feels like backfire from engine when decelerating? http://schematicsdiagram.blogspot.in/2012/02/feels-like-backfire-from-engine-when.html
--------- Jeep Backfires? http://technoanswers.blogspot.in/2012/02/jeep-backfires.html
----------- Nissan Pathfinder stalls and bucks on Acceleration?

http://technoanswers.blogspot.in/2012/02/nissan-pathfinder-stalls-and-bucks-on.html

---------
Nissan Pathfinder Backfires?

http://technoanswers.blogspot.in/2012/02/nissan-pathfinder-backfires.html

----------------
Car not starting? http://repairhelpcenter.blogspot.in/2012/02/car-not-starting.html
--------- Engine turns over but will not fire or start? http://technoanswers.blogspot.in/2012/07/engine-turns-over-but-will-not-fire-or.html
---------- Car will not start? http://repairhelpcenter.blogspot.in/2012/02/car-will-not-start.html

---------


These help links will help.
For more help keep updated.Thanks.

Oct 21, 2012 | Cars & Trucks

1 Answer

1988 k1500 backfires and almost dies when warmed up and on highway when giving more gas


Usually when you get a backfire thru the intake the problem is timing or a lean fuel mixture.
If you are sure the ignition system is in good condition, I would have the fuel pressure tested.
You could also have a vac leak that is random, or a problem with the throttle position sensor. But if the sensor has failed you should get a trouble code and check engine light.

Sep 18, 2012 | 1993 Chevrolet K1500

1 Answer

I have problems with my 98 chevy k1500 pickup on the highway. Once i hit about 65 mph it wont accelerate and it backfires. also, after i come to a stop and try to accelerate up to highway speeds again,...


If it is running bad enough to be backfiring, the Check Engine light should be on. I would start with scanning the engine computer for fault codes.

Feb 20, 2011 | 1998 Chevrolet K1500

1 Answer

1999 Grand Cherokee backfires through carb. when starting to take off. When at highway speeds its fine, and it does'nt do it all the time. There is a check engine light on.


it sounds like you may have a missfire which could be caused by faulty spark plug or ignition leads i would check these first

Jun 05, 2009 | 1999 Jeep Cherokee

1 Answer

Constant backfire on deceleration 88 chevy 4.3 V 6


Check for exhaust leaks. Esp Leaks toward the front of the car. Hold your hand over the tail pipe using a rag and see where the loud hissing noise comes from. Repair the leaks and I bet the backfiring goes away

Good Luck

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