Question about 1999 GMC Jimmy
Is there a way to test the MAF and 02 Sensors on a 1999 GMC Jimmy?
Replace the fuel pump with another one.
This is a common issue.
Don't use an "aftermarket" pump; buy one from Chevy.
I just had this exact same issue in my shop. The truck would run for a bit, and then just stop. I had the truck towed in, and the fuel pressure was good. Drove it for a while, with the gauge hooked up and taped to the windshield, I could see the fuel pressure start to drop off. I told the owner that she needed a new fuel pump.
The owner told me that the pump was 2 months old. I went ahead and changed it anyway. A new fuel pump cured the problem.
Testing the MAF and the O2s is not going to tell you anything. A failure, an open or a short would set the check engine light.
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Posted on Jan 25, 2009
You've mentioned the plugs. How was the plugs? I just replaced all of my oxygen sensors last week because I was kind of having the same problem with my 99 GMC Jimmy. My Jimmy is running just fine now after I replaced all of my oxygen sensors. I bought them from O'Reilly for $52.99 a piece, AutoZone was selling it for $59.99 a piece. I had to disconnect the battery for a few minutes after I installed my new sensors. All is cool now.
Posted on Apr 28, 2009
For it to bog down and have no exhaust fuem leads me to believe it is getting a lack of fuel. I know you said the fuel pump is putting out enough and something about the MAF (Mass Air Flow Sensor) and the O2 (Oxygen sensor) but to tell the truth, it maybe getting those signals because the circuit in question is so far below level that those two look too much. If I'm not mistaken there is a pressure regulator between the fuel line and the injectors. This device could be clogging or almost sticking shut. Any help here? If this is helpful, please post as such. TY
Posted on Jan 27, 2009
Does it idle fine? just bogs out driving? if fuel filter is clogged it would show good pressure but would not have the volume to keep up under load need a gauge on it while driving. also if cat convertor is stopped up it would bog out. this would be indicated by convertor getting extremely hot. there is really no quick fix guidde i can give you need to be able to see data while it is acting up. I doubt it is o2 sensor. check your maf for trash in it.
Posted on Jan 25, 2009
The distributer is bad the gears on the end are wore down to a point that what makes it bog lack of spark. its actually flooding out ... been there done that.....
Posted on Mar 02, 2010
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