Question about 1998 GMC Savana

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1998 gmc savana with 101000 miles, starts but runs poorly. Skips and sputters, backfires thru trottle body. Code reads mass air flow sensor bad, replaced wirh another one. Didn't help. Now engine tries to start but won't. You can hear the fuel pump running. Checked for fuel going to trottle body ,has fuel pressure there. Where do I check next?

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This sounds like the timing is out, backfires, have you tried checking the plug wires, spark plugs, and did you reset the code after installing the MAF sensor?

Posted on Sep 03, 2010

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Posted on Jan 02, 2017

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I was putting you in a thinking position.
Yes,if you disconnect the MAF-it will not start. Or if the computer has no input or control over airflow,as a result of a defective sensor.

Now, without your vehicle and some testing, I don't know if it is bad.
You suggested it wouldn't matter and would start.
Only replace it ,if you get it tested, and there is a problem. There is nothing you can do, and good luck finding a repair shop, that will do anything but replace it, and hope for the best,at your expense.

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1 Answer

G.M.C. Savana 5.7 cranks but will not start. Its getting spark and fuel but still does not start.. Ran fine yesterday. obd2 code came up as po102 map sensor. I don't think this is the problem. Van should...


Let go with your theory

You get a PO102 MAF code.( Mass Air Flow Sensor)
Lets say the sensor is somehow not working correctly,and as you say,it has spark and fuel

I would guess, you think, the engine would be happy, having no idea how much air it is getting. Kind off like the computer will somehow overlook it is controlling an air pump in the first place.

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You need to look for a hole or loose fitting clamps where your air duct runs from your air filter to the throttle body where the gas enters the motor. Any leak in this ductwork will make your vehicle hard to start and run poorly because too much air is getting past the mass air flow sensor.

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You shouldn't run with the mass airflow sensor disconnected. That's probably the problem. Is it bad or shy is the mass airflow sensor disconnected?

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