Question about GMC Jimmy

1 Answer

I HAVE 1998 JIMMY 4.3 VORTEC IT KEEPS FALING THE PLUGS, BLOWS OUT A LOT OF BACK SMOKE WHAT WOULD BE CAUSING THIS?

Posted by on

1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    Superstar:

    An expert that got 20 achievements.

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

  • Master
  • 6,784 Answers

Hi. This black smoke will be the result of a failed O2 sensor. It could be bank 1 or 2. I would recommend to run a diagnostic scan, if not done so already. The scan will isolate the affected sensor, and confirm the issue, as well. This issue will create back-pressure, which will choke out your cylinders and destroy your catalytic converter if the affected deices are not replaced soon. If you smell a rotten egg like odor coming from the exhaust, this will confirm that the catalytic converter is damaged along with the O2 sensor(bank one or two).

This condition will also damage spark plugs, due to the back pressure created by this issue.


Although the O2 sensors and catalytic convert may be the actual culprits here, there are other locations that may cause this as well. I will list he other possible culprits below.

1 MAP sensor - This sensor could be faulty of disconnected. Replace if needed.(this will show on the diagnostic scan results if it is indeed damaged)

2 Coolant temperature sensor - Check the connectors at the sensor for splits of disconnections. This sensor will induce your symptoms as well, if damaged. This will show on the diagnostic scan, as well.(if damaged)

3. Canister Purge Valve - This is part of the emissions assembly. This valve, if damaged, will induce the symptoms you have described. Replace if needed.(This will show on the scan if damaged)

4. Fuel Injector Pressure Regulator - This is another fail point in this situation, as well. This device may be damaged. Replace if needed.

Posted on May 11, 2010

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

Can I put a 1997 Astro Van AWD 4.3 Vortec motor into a 1998 GMC Jimmy?


There is no way that everything will be perfect. Although if you take you time and change over the sensors, maybe exhaust manifolds, etc. the motor should work. A little time looking it over several times when it is out of the vehicle will save you a lot of headache later. Please rate my answer so I am rewarded points for it.

Jan 27, 2012 | 1998 GMC Jimmy

2 Answers

I have a 4WD 1998 GMC Jimmy 4.3L Vortec V6 and it started running hot then it shut off and wouldn't start back up... do you think there would be any way to fix without replacing the whole engine


IS THEIR WATER IN THE OIL? CHECK THE PLUGS TO SEE IF THEIR WET.YOU MIGHT PUT SOME PLUGS IN IT IF WET TO SEE IF IT WILL RUN.THEN PUT SOME HEADGASKETS ON IT.BUT IN REALITY NEW MOTOR WOULD BE BEST.

Aug 26, 2011 | 1998 GMC Jimmy

1 Answer

On start up will start then shut sown 3 or 4 times what will cause this


If this is a 4.3 vortec, it is probably a crankshaft sensor going bad=you can try unplugging/plugging it back in to see if it helps, but they usually don's last very long when they start to go. Held in with one bolt, not expensive and easy to replace although you have to lie under the car to do so.

Jan 23, 2011 | 1996 GMC Jimmy

1 Answer

I have a 1998 gmc 1500 350 vortec. just replaced 8 leaky fuel inj. now it has smoking exhaust no power terrible gas milage . and the plugs on one side of motor r fine but the other side...ALL 4 plugs r...


The 8 leaky fuel injectors might have been caused by a bad fuel return regulator. But, that put aside, the 4 plugs misfiring on one side can be caused by a bad computer or connections to the computer.

Aug 18, 2010 | 1998 GMC Yukon

1 Answer

98 gm blazer has black soot from muffler giving code insufficiant switching o2 sensor bank 1 and 2 any ideas ?


Your Jimmy is running rich, air fuel ratio is not correct. Start with cleaning your MAF sensor, a dirty MAF sensor will cause your engine to run rich or lean, other causes would be a faulty fuel pressure regulator. Start with the simple and to common and try cleaning your MAF sensor, you can pick up a can of MAF sensor cleaner at most auto parts store like Auto Zone or Part Source.
Also make sure your engine is running at the proper operation temperature 190", cold running engine will cause the ECM to run your engine rich. Causing the back soot and fouling up your spark plugs and intake ports with carbon.
The ECM was programed to recognize the 4.3 vortec to run at 190" and anything cooler will cause it to run rich and poor on economy.
Thank you for using fixya and good luck.

Apr 27, 2010 | 1998 GMC Jimmy

2 Answers

Hard to start and when it does a lot of black smog came out of the exhaust. Already change the map sensor.


check your fuel injectors for them sticking open. will the engine idle and if so how well? this should be a vortec motor which has spider injection. big pain. let me know.

Dec 28, 2009 | 1998 GMC Jimmy

2 Answers

98 gmc jimmy smokes real bad and burns lots of gas


The smoke is probably a black smoke from burning excessive fuel. That fuel injection system has seperate plastic runners going to each cylinder inside the intake manifold, I think it was nick-named the spider, they go bad and need to be replaced. Problem could also be the fuel pressure regulator, I think it's also under the intake manifold. The bottom line is that you have to remove the intake and look for your problem.

Oct 05, 2009 | 1998 GMC Jimmy

5 Answers

98 GMC JIMMY V6 4.3L VORTEC 4W DRIVE


My husband said to take tire off and go through the firewall to get to that one plug. That's what he done.

Nov 04, 2008 | 1998 GMC Jimmy

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

Related Topics:

33 people viewed this question

Ask a Question

Usually answered in minutes!

Top GMC Experts

yadayada
yadayada

Level 3 Expert

75744 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...