Question about 1995 GMC Suburban

1 Answer

Hello...I have a '95 GMC K2500 Suburban with a 5.7L that failed a recent emissions test. I replaced the spark plugs, removed and cleaned the EGR...cap, rotor wires look OK...truck re-tested worst

Posted by on

  • danajoemcdon
    danajoemcdon Jan 11, 2013

    *re-tested WORSE, not "worst" like I originally posted - WTH?

×

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.

    Master:

    An expert who has achieved Level 3.

  • GMC Master
  • 511 Answers

Retarding the timing will cool the combustion which will lower the Hydrocarbon number,it will run bad but after a passed e test put the timing back to an advanced state which may help with the stumble.

Posted on Jul 24, 2017

6 Suggested Answers

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

  • 375 Answers

SOURCE: adjust timing on 1998 GMC K2500 pick up 5.7 liter

It has to be done with a scanner. You can adjust this distributor, but there are no timing marks to watch as you move it. There is a timing mark on the balancer and on the timing cover for referencing Top Dead Center #1 cylinder only, but it is only used for dropping the distributor in to get the engine up and running. A scanner is needed to properly adjust the timing. Connect the scanner and look for a data parameter labeled ‘cam offset’ or possibly ‘cam ******.’ It will be listed in degrees. Start the engine, and bring it up to 1500 rpm. Note the reading. If the timing specification is not within plus or minus two degrees of zero, you need to move the distributor. You can move the distributor with the engine running but the timing will not change. After you move the distributor, the ignition has to be cycled off to let the computer learn the new timing spec. Restart the engine, bring it up to 1500 rpm and see what the new spec is. You must repeat this procedure until you get the timing into the specification as mentioned above. Once you have it set to spec, the code should clear.

Posted on May 18, 2008

  • 1 Answer

SOURCE: 1995 GMC JIMMY

I had a problem just like that on my blazer and it turned out to be the wire harness on the fuel injectors. It could also be your fuel injectors, had to replce mine at 85000

Posted on Aug 04, 2008

  • 232 Answers

SOURCE: 1991 gmc med duty truck with 454 tbi ,backfires, no power.

By module do you mean computer? There's nothing wrong with it. Yea, replace all ignition components with new ones. New cap, rotor, wires and spark plugs.

Posted on May 18, 2009

emissionwiz
  • 75797 Answers

SOURCE: Misfires 96 gmc sierra 5.0

I suggest you have the injectors tested by the dealer, the sludge buildup will not cause a miss fire. to clean the throttle body use carberator spray while holding the engine idle high.

Posted on Aug 05, 2009

  • 491 Answers

SOURCE: fails idle emissions test hc

High HC?
****** ignition timing....this will lower HC but raise other values during test.
Do you have room to increase other values?
After test return timing to the most advanced position without spark knock under load for best MPG.

Posted on Aug 11, 2009

Add Your Answer

Uploading: 0%

my-video-file.mp4

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

×

Loading...
Loading...

Related Questions:

1 Answer

Did not pass emissions test for hydrocarbons


When was You're last Tune up?
Check the Spark Plugs to make sure the Gap is correct. HC is unburned fuel ,Check the Air filter and Replace as necessary,If coil over plugs Make sure to replace the Boots on the coils as they have a tendency to Bleed and wont show a trouble code.otherwise Change the Spark Plug Wires this should Clear You're Problem

Dec 31, 2014 | GMC Cars & Trucks

1 Answer

Will 1995 half ton fit 1995 three quarter ton tranfercase


gmc and chevy k1500 pickup and suburban years 95-99
k2500 pickup years 95-98
k2500 suburban 95-96
gmc k2500 and yukon 95-98
I hope that helps if so please rate my answer

Dec 26, 2014 | Cars & Trucks

1 Answer

SPARK PLUG GAP 1996 GMC SUBURBAN V8 4WHEEL DRIVE GAS ENGINE


it should be 0.060 there is an emission info tag possibly on the fan shroud or radiator support that has the gap info in the bottom corner.

Jan 25, 2014 | 1996 GMC Suburban

2 Answers

Will start but wont run


get a spark tester ,this is only a basic test .check the coil for a spark if found remove the lead from the spark plug. plug in the tester. turn the engine over to test for a spark each time. if no spark found check and clean the contacts in your distributor cap and rotor arm then refit test for a spark. at the lead to the spark plug .if found now remove your plugs one at a time .smell for fuel .if found change the plugs.

Dec 21, 2013 | 1998 GMC Sierra

1 Answer

Fail smog for high emission


you need to do a major tuneup !!!!!!! replace air & fuel filters, spark plugs & plug wires, distributor cap & rotor, replace OXYGEN SENSOR, change oil & filter, hopefully your catalitic converter is ok, if not , it should be replaced !!!!!!!!!!! together w/tuneup would be the best way to assure passing emissions !!!!!!!!

Mar 25, 2013 | 1993 Chevrolet Suburban

1 Answer

Not getting any spark with 1998 Suburban K2500 5.7 Had an issue with the battery the other day. Died on me in a parking lot. Tried jumping but would not start. Put a new battery in the next day and all...


Check the Ignition Control Module. Usually these are mounted in the base of the distributor - the distributor wire harness plugs into it. If you already changed that, then I would have the ECM ( Engine Control Module ) tested. I really hope it is the ICM - they are much cheaper than the ECM!!
Good luck and I hope this helps!!

Dec 05, 2010 | 1999 GMC Suburban

1 Answer

Fails idle emissions test hc


High HC?
****** ignition timing....this will lower HC but raise other values during test.
Do you have room to increase other values?
After test return timing to the most advanced position without spark knock under load for best MPG.

Aug 11, 2009 | 1991 GMC K2500

1 Answer

My 1992 Ford f150 failed emissions test co was to


theres 3 things ur emisans fail on 1 spark plugs 2 air filters need changing 3fuil filter so yes a full service should do it change ur oil fuil filter air filter oil filter and oil

Mar 04, 2009 | GMC Yukon XL Cars & Trucks

1 Answer

Engine died while driving, cranks but won't start.


not all scanners a created equal. You need to check for trouble codes...............but it must be fixec by now.

Dec 10, 2008 | 1996 GMC Suburban

Not finding what you are looking for?
1995 GMC Suburban Logo

Related Topics:

50 people viewed this question

Ask a Question

Usually answered in minutes!

Top GMC Experts

yadayada
yadayada

Level 3 Expert

75797 Answers

Freddy

Level 3 Expert

1311 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22114 Answers

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

Answer questions

Manuals & User Guides

Loading...