Lt1 Closed Loop issues
Lt1 Closed Loop issues So, I'm having a new issue that is leaving me scratching my head. I haven't had time to do a full inspection checking for burnt plug wires or harness. All of a sudden my car has a lack of power, shakes/shudders at WOT and backfires at low rpms. Went through the ignition system and ICM tested bad. Replaced it but didnt fix the issue. 02 on the scan tool is within proper V range although I'm wondering if it's a false positive. FP at wot is good, hooked a FP Guage up and taped it to the window. Car pulls like a raped ape in open loop with no issues. Wondering if anyone else has experienced the same issue. Freaking just dont have the time to do a full diagnostics right now. Barley even have enough time to enjoy the car. Mods in my sig
Last edited by Ruken; Aug 14, 2018 at 01:05 PM.
Additional checks:
CTS & IAT (resistance value at ambient temp with engine cold and/or hot... hot should be resistance equivalent to 170-215*F)
MAF (you can unplug it but if the speed density tables aren't populated it'll just run a different or additional flavor of crap)
And yeah, PE mode ignores O2 output and goes straight to PE mode VE & timing tables so it'll clear up at WOT if spark and fuel are good, which you verified...
CTS & IAT (resistance value at ambient temp with engine cold and/or hot... hot should be resistance equivalent to 170-215*F)
MAF (you can unplug it but if the speed density tables aren't populated it'll just run a different or additional flavor of crap)
And yeah, PE mode ignores O2 output and goes straight to PE mode VE & timing tables so it'll clear up at WOT if spark and fuel are good, which you verified...
Additional checks:
CTS & IAT (resistance value at ambient temp with engine cold and/or hot... hot should be resistance equivalent to 170-215*F)
MAF (you can unplug it but if the speed density tables aren't populated it'll just run a different or additional flavor of crap)
And yeah, PE mode ignores O2 output and goes straight to PE mode VE & timing tables so it'll clear up at WOT if spark and fuel are good, which you verified...
CTS & IAT (resistance value at ambient temp with engine cold and/or hot... hot should be resistance equivalent to 170-215*F)
MAF (you can unplug it but if the speed density tables aren't populated it'll just run a different or additional flavor of crap)
And yeah, PE mode ignores O2 output and goes straight to PE mode VE & timing tables so it'll clear up at WOT if spark and fuel are good, which you verified...
54k miles on body and motor, if my visual inspection and further diag dosent prove fruitful. The next step is checking plugs, Compression and leakdown test
