Question about 1993 GMC Sierra K1500

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1993 gmc sierra 5.7 starts rough, black fuel smoke, smooths out and runs fine after 15 secs.... changed egr ealve not solenoid thinking map sensor? help

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When you shut off the motor, see if fuel is dripping from the injectors. It sounds like one might be leaking.

Posted on Jul 04, 2010

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Posted on Jan 02, 2017

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1 Answer

Why does my truck stall when I plug in the map sensor?


If that's all you have to offer then I would say your map sensor is bad...

May 09, 2014 | 1991 GMC Sierra

1 Answer

1993 gmc sierra 4wd runs rough after engine warms up.At stop lights she will stall out if i dont keep foot on break and give a little gas. any suggestions ?


Question, does this pickup blow black smoke on idle or at a stop sign. If so check your map sensor might be plugged up or unplugged or bad.

Mar 05, 2014 | 1993 GMC Sierra K1500

1 Answer

1998, gmc,K2500, 5.7l, 250,000km, starts good but idle is very rough and lots of black smoke, lots of power, runs good, but again, lots of black smoke. After you run the truck for awhile, idle is good, but...


A bad coolant temp sensor for the ECM will cause that problem ... they are cheap and easy to replace. One other possibility is a piece of carbon stuck in the EGR causing an internal vacuum leak ..
Good luck.

Apr 27, 2011 | 1998 GMC Sierra

2 Answers

Want to know what a code PO171 means(system too lean bank1).car idles rough and blows black smoke when you rev it up.and is also misfiring.?


If the car is thinking its lean, but its blowing black smoke then it sounds like its confused. Sounds like the o2 sensor is bad. How does it run when its cold?

Feb 12, 2011 | Pontiac Sunfire Cars & Trucks

1 Answer

2003 GMC Sierra Has recently developed rough idle/lope at idle which sometimes goes away. Runs fine otherwise. Scan codes-Lean condition bank1 and bank2. Random misfires on all cylinders. Fuel pressure...


You never replace anything, on a Wishing,Hoping,Pushing,Poking,diagnostic approach

You learn the vehicles Systems,Test,then Replace,if you have a failed component.

Work on the Misfire Issues.
Then you lean O2 Codes will go away.

Not a the plugs.

Think lean---Vacuum leaks,EGR Valve leak,EVAP System leaks,anything with a hose that lets air into the intake system.
Exhaust System leaks,near sensors

Nov 24, 2010 | 2003 GMC Sierra 1500

3 Answers

95 GMC Sierra 4x4 350 5.7 rough idle problem


It sounds like a MAP sensor going bad. MAP is short for manifold absolute pressure sensor, it senses the manifold pressure and applies the right amount of gas with the right amount of ignition timing so the car runs and performs well if this does not work properly. It throws off the whole loop cycle for the computer, which in turn makes it run badly and get poor fuel economy. It can causes the engine to have a lack of power, combined with a loss of fuel economy. Poor take offs and sometimes an occasional stalling may occur if the MAP sensor is faulty and sending the wrong signals to the ECM.
Hope this helps and thank you for using Fixya.
Here is a link that my help you in the future. http://www.troublecodes.net/GM/

Mar 16, 2010 | 1995 GMC Sierra

2 Answers

My truck has a hard time starting when its the first time of the day and it backfires and blows white smoke during this process but after running the RPMs up for a while it finally smooths out and runs...


My 94 chevy with a 5.7 seems to foul a couple of spark plugs at the back of the engine on the drivers side quite quickly. My uncle who is a mechanic said he has seen same problem many times on that engine.
I sugest you pull your plugs and clean or replace if necessarry.
The first time I changed the plugs on the truck to fix a rough idle , I started at the back of the passenger side and worked my way around.
Of course , the last 2 that I got to were the problem...... Heartless uncle just laughed.
Also , white smoke just at start up could indicate worn valve stem seals.

Feb 28, 2010 | 1993 GMC Sierra

1 Answer

2003 DODGE NEON RUNS ROUGH


Try cleaning the EGR valve first



electronic Tempture Control
ECT sensor
symptoms
Potential Symptoms

Symptoms of a P0118 could include:

* Very poor fuel economy
* A no start condition
* Vehicle may start, but run very poorly, blowing black smoke, running very rough and misfiring
* Illumination of MIL
EGR valve

Usually a fault in the control circuit, will leave no noticeable symptoms other than the Malfunction Indicator Lamp (MIL) illumination. However, if the EGR control solenoid
is stuck open due to debris, etc. the code may be accompanied by misfire under acceleration, rough idle, or engine dying altogether.

Dec 22, 2008 | Dodge Neon Cars & Trucks

2 Answers

Sputtering, chugging, black smoke - won't restart when hot


check your tail pipe for a "clog" engine not breathing correctly.

Jun 22, 2008 | 1993 GMC Sierra K1500

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