Question about 1999 GMC Safari
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Posted on Jan 02, 2017
SOURCE: 1997 gmc jimmy
Sounds like the cpi injector assembly. The fuel pressure regulator may be leaking. Or the poppet valves on the injectors may be sticking or shot. I replaced almost every part on my truck and that is what it ended up being the whole time. It's a common problem on these models. Hope this helped
Posted on Mar 04, 2009
SOURCE: 02 sensors not ready
The code P0420 indicates that the catalytic converter is not functioning efficiently. This could be because the cat is damaged or the engine is not running very well and the cat cannot keep up with the emissions. You should ensure that the spark plugs and ignition components are in top shape before replacing anything else. If a compression check reveals a low cylinder, you will not be able to prevent this code as even a new cat cannot keep up with a dead miss. If the state of tune and the compression is good, then you'll likely need a cat.
I've posted the drive cycle just so you know what to do when you have resolved the code.
Do not leave the key in prior to the cold start or the heated oxygen sensor diagnostic may not run.
Posted on May 14, 2009
it can be two things the cat pluging up or the evap canister valve is stuck open or the fuse is blown check fuses first if ya need more help post here and I will give ya some more info.
Posted on Aug 20, 2009
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