Question about 1996 Chevrolet G10
I have a 1996 Chevy Express 1500 conversion van with a 5.0 vortech equipped. When cold (first start of the day or after sitting long enough to cool completely down from it's normal operating temperature) it idles fine and does not bog down at all. If you drive it from cold, it will warm up and run perfectly with no bogging or hesitation. Shut it off, wait about 5 minutes to half an hour and start it up again, then drive and it will bog down on gradual acceleration (but not hard acceleration) for the first minute to two minutes. (Acts almost as if it's flooding while running). I've replaced the plugs (checked the gap to verify correct), rotor, distributor cap, fuel filter and plug wires. I have gotten two codes: Cylinder 7 misfire (occured only once) and P0420 Bank 1 Catalyst below threshold. However, the problem started about a month ago and the errors only happened yesterday and today. At my wit's end here. Please help with suggestions? (I'm going to try to get a compression test tonight and praying it's not a valve/head gasket or cam issue)
I have a 1996 chevy express conversion van 5.7 liter I have misfire in all cylinder after the truck is warmed up I have new plugs cap rotor wires new o2 sensor. o2 sensor has been changed 3 times in 3 months I was told by my mechanic it was my catalytic convertor dose that sound right please let me know thanks Vince
Posted on Oct 27, 2011
Van runs in park, but put it in gear and hit the gas it stalls everytime? im thinking map sensor. any advice. its a 1996 g10 conversion
Posted on Apr 16, 2010
The cylinder 7 misfire is likely a symptom of the problem, not the problem itself.
Typically, the catalytic converter has an oxygen sensor in front and behind it. When the vehicle is warm and running in closed loop mode, the upstream oxygen sensor waveform reading should fluctuate. The downstream 02 sensor reading should be fairly steady. Typically the P0420 code triggers the check engine light if the readings of the two sensors are similar. This is indicative of (among other things - such as faulty sensors in the "emissions loop") a converter that is not working as efficiently as it should be.
I do not believe that it is a problem with a valve/head gasket or cam.
Posted on Jan 13, 2009
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