I have a 94 Yukon 5.7 litre, 260,000 miles, 4WD. EFI. Runs great but I had to replace fuel pump about 2000 miles ago and it seems like it uses alot more gas than it did before. My issue is that here lately whenever i am in drive at a light the engine light comes on. As soon as I drive off, two seconds later it goes out. I thought low oil but it was fine I even changed out the pressure sensor to no avail. All vaccuum lines, cap, plugs and wires appear fine. In park it idles between 1000 to 1200 RPM oil PSI is around 40-60, in drive its 600 to 800 RPM oil PSI is around 15-20. It also seems to only do it when it warms up. Doesnt leak any oil either. And I dont have any constant codes to troubleshoot. Any ideas?
94 YUKON 5.7 engine light at idle
- Thread starter batin76
- Start date
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SunlitComet
OBS Jedi-Do Good
turn key to on and start then short to each other the last two upper pins A and B on the diagnostic connector under left dash.
observe check engine light. pay attention to it flash rate is it fast and constant is it slower and does it stay on more or off more when the light is on at all. try this at a steady speed too.
observe check engine light. pay attention to it flash rate is it fast and constant is it slower and does it stay on more or off more when the light is on at all. try this at a steady speed too.
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