My truck is running lean on the driver side! I pulled the plugs and the passenger side was burnt with no carbon and the driver side were all the same but with black carbon on all of them! the truck was shaking before i pulled them and now that I replaced them it was running good, now that ive ran it for a couple of days its shaking again. I checked it at autozone and it was coming up as running lean!! can you help me out?? my email is firstname.lastname@example.org
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Re: 1998 gmc jimmy
If your engine is a Vortech, most likely you have an intake leak going on. This is very common with the 5.7L Vortech and the 4.3L Vortech. A leaking intake will causing one side of the engine to lean and the other side will be normal.
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Just a thought,pull the dist.cap and make sure the rotor has no side to side play ,thinking maybe a bad upper bushing in the dist.Also,if the EGR valve has carbon and soot built up on the piston it will make it idle really poor ,but run ok. Might pull the EGR and clean it with intake cleaner. Hope this helps.
More than likely bank 1 sensor has a possible vacuum leak, or a lean misfire on that side of the bank.(lean misfire happens when gap of spark plug are exceed due to wear), As for the 02 sensor I agree that it is reporting the true engine condition on that side of the bank
It's on the lower corner of the radiator on the side facing the engine. If you pop the hood and shine a light down there, you should see it. Some are on drivers side, some passenger side. Depends on where your radiator hose is. It's usually on the other side. It should just be a plastic plug. Some are hex shaped (wrench for removal) some look like a plastic wing nut. It could also either be black or white.
It's usually easier to get to from the top side bending over. From underneath, the core support (cross member to some folks) is usually in the way unless you scoot back far enough under the truck to look up at the radiator. Doing this is also a sure way to get anitfreeze on yourself when you pull the plug. Been there/done that. Haha.
i have a 96 and an 01, go under the truck from behind the drivers side front tire, the drain plug is at the back of the oil pan just behind front skid plate, the oli filter is right behind the front bumper , there is a trap door to get to the filter, but that's only for 4x4 or awd modle's, 2wd filter's are on the drivers side of the enging infront of the starter
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.
you have to remove seat cover on back and bottom of seat . there is a long plastic clip sowed to seat covers . push in and un hook then you can pull seat cover up to see bolts. dont pull to hard or you will rip seat cover .