Zorad1000
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- Jan 1, 2019
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My ‘99 Suburban k15000 starts fine and runs great as long as it isn’t idling . But as soon as it goes into closed loop the engine dies . It has always started right back up . This problem started a couple of years ago then it went away on its own . Now it has started doing the same thing. When it first started a couple of years ago , I replaced the idle air control motor. That seemed to help a little but the problem was still there just not as bad , but now it is worse than before...I have a scanner and checked for codes , there are none . I watched the o2 sensors and all 4 seem to be working but the downstream bank 1 o2 sensor seems a little high most of the time . Just before the engine dies maybe 15 seconds before all 4 o2 sensors go to about .900 and the fuel trim goes to -30.5 on both banks . Then the engine dies . It always starts right back up . I forgot to mention that I had replaced the bank 2 catalytic converters last year , but I knew that it was bad and the engine light was on with the code for the converter... just wondering if anyone could help me out with this problem?