The CTS is a common failure for a TBI engine. The cutting out you are experiencing is the huge amount off fuel being adding intermittently as the PCM sees an engine temp of -40* when the sensor fails. It is enough added fuel to stall the engine and cause the issues you are having. Ignition cut out issues are usually followed by exhaust backfire.
89 K1500 Scottsdale 5.7L 5spd 3:42 RamJet cam Dart iron TBI heads 427 PCM swap
95 C2500 Cheyenne 6.5L turbo diesel 4L80e 4:10 DB2-4911 Manual pump conversion 0411 PCM trans control 2Bar COS
05 Outback XT 2.5L turbo gas auto
I have experienced the engine backfire as the ICM failed. Didn't know what it was at the time.
Ran the experiment today, unplugged the CTS and the engine stalled and would not restart. Jumpering it seemed to run fine. Both cases threw the correct error code. Since I already ordered the ICM and CTS I'll swap both parts.
jumpering the connector and the vehicle running better is a good sign. I haven't seen this problem personally in over 10 years. as i stated before it is part of my TBI tuneup "recipe".
i made a mistake it's a 369 not 395. check what module you have currently. 048 will pull 6* of timing by 5000 rpm. 369 will add 2* by 3600. on a stock motor you should notice an improvement going to a 369 module. if you tune the timing tables it shouldn't matter what module you use.
Last edited by tayto; 10-20-2021 at 06:07 PM.
I can only buy what's currently being sold. Not sure what the 369 module converts to these days. The D1984 is advertised as the "police" module. I assume that means it has a better performance profile, but who knows... I do have an older module that is marked as a 369 module. I'm keeping it as a spare.
One thing that just occurred to me also check the connector at the CTS, have had to replace one or two of those over the years as well.
89 K1500 Scottsdale 5.7L 5spd 3:42 RamJet cam Dart iron TBI heads 427 PCM swap
95 C2500 Cheyenne 6.5L turbo diesel 4L80e 4:10 DB2-4911 Manual pump conversion 0411 PCM trans control 2Bar COS
05 Outback XT 2.5L turbo gas auto
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