Question about 1998 Chevrolet K1500

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I have a 98 gmc K-2500 that is fouling the plugs on the right bank only. I have run compression test on it and they are all in the 170 to 180 range. I had problems with the o2 sensor but i have fixed that. I'm wondering if my intake maybe leaking oil into the right side or if my water temp (it has been running cold, 160 or so) may be what is affecting it. I know my gas milage has bottomed out. And i have been loosing oil somewhere, But it is not somking blue, only black from over fueling the right side.

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If you are not getting good spark you will foul plugs. If you have black smoke the fuel pressure regulator might be bad. It is located on the end of one of the fuel rails, it has vacum on it

Posted on Mar 14, 2009


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I have a toyota corolla 2003 and it did not pass the emission test due to a sensor with code P0175

so get it fixed? no engine size posted. so ???? impossible to be accurate.
or DIY, you have tools? and skills. to do that.
it means the Oxygen sensor has issues.
means bank 2 is stuck rich
bank 2 means car is V6. bank 2 means bank with #2 cylinder loc.

for much better, reasons and test. see here

is this the only DTC code.??? no others, and did you use a scan tool
that can read all Toy codes, like P1xxx ? codes factory codes.
if not you missed the boat.
my wild guess. (i do tests in real world)
bank 2 is rich.
due to what?
1: misfiring, ever do a tune up? see fouled spark plugs bank 2, look.
2: injector leaking.

there are lost of tests, im not going to list them all.
but it takes tools and time.
compression at spec. bank 2?
or bad COP on bank 2,

Jan 14, 2014 | 2003 Toyota Corolla

2 Answers

1997 GMC Sierra 5.7 has bad miss on left bank (2 4 6 8).

Don't know if you did the work or paid someone

If you paid someone ,then they failed to do what was
necessary to properly resolve ALL issues

Entire right bank appears to have a leaking intake gasket,
that is my guess,only a guess

Dec 12, 2012 | 1997 GMC Sierra

1 Answer

My 2004 ford freestar with the 3.9L has been fouling out plugs with some consistency. they look to be oil fouled did compression test and they 1)195 2)200 3)200 4)205 5)200 6)205. any ideas od why they...

You need to have the rings replaced. Do the compression check again on a cold motor with this exception, add a small amount of oil to each cylinder. First do the test on the cylinder and record the pressure then add a small amount of oil and redo the test and compare the compression. I am attempting to identify if the problem is rings, valves or head gasket. I am concerned about cylinder 1. The compression is within range however the readings you provided indicate uneven compression. If after you add the oil the pressure evens out across the cylinders the problem is rings. If you get the same readings during both test the problem is the Head Gasket or a need to have a valve job done. The fouling is caused by oil getting past the rings or seals. Use regular oil in this test preferably in a hand oiler. Two to three squirts should be enough. DO NOT USE WD40 OR OTHER SPRAY LUBRICANTS. Those will damage your cylinder walls.

Aug 09, 2011 | 2004 Ford Freestar

1 Answer

Smoke from one exhust pipe and rough idle ,455 v8,changed oil,changed valve cover gaskets and cleaned fuel tank changed fuel fliter,smokes at idle and driving.

The cause may be from worn valve seals on that bank of the engine, and oil enters the combustion chamber fouling the spark plug(s). A Compression test will be needed to verify if it is the seals or piston rings not sealing.

Apr 14, 2010 | 1972 Oldsmobile 98

1 Answer

98 gmc 2500 backfiring in exhaust

your catalytic converter/s is/are plugged.
there is 2 of them coming out of both banks ( sides) of the motor. they join to one main pipe that goes to the muffler at the back of the vehicle.

you can take it to a muffler shop and they can test the pressure in your cat. converters for cheap or free. that will tell you if they are wrecked or not.

i would get it checked out asap because if your cats are the problem they well break your o2 sensors for the cats.

if you need to fix them you can do it cheeply by drilling holes in the cats to let the air out.

hope this helps

Apr 09, 2010 | 1998 GMC Sierra

1 Answer

1986 ford ranger that is running very rich

If you have fuel in your oil, your piston rings are bad. Get a compression tester from your local auto parts store and do a compression test on each piston. If compression drops, then my theory is confirmed. The only repair is rebuilding the engine, or buying a new engine. Replacing rings is very intensive work. It's easier to simply purchase a crate motor.

Jan 02, 2010 | 1986 Ford Ranger 2WD

2 Answers

Runs rough and keeps fouling out new spark plugs

sounds like too rich of a mixture check for vacuum leaks and check fuel press regulator

Apr 23, 2009 | 1996 Mazda Millenia

1 Answer

98 Chevy 5.0 fast idle

try cleaning the throttle plate with the right cleaner . from a auto parts store.

Feb 28, 2009 | 1998 Chevrolet C1500

1 Answer

4 wd low range will sometimes engage 4wd high will never engage

I had a very similar problem with my 98 gmc 2500. The 4 low would engage - though the upshifts were erratic, but no 4 high though the light sometimes came on. I changed out the electric shift solenoid or whatever it is called, on the transfer case and it worked fine after that. A fairly simple fix that can be done in 15 minutes. Hope this helps.

Dec 08, 2008 | 1998 GMC Jimmy

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