Help us help you. By posting the year, make, model and engine near the beginning of your help request, followed by the symptoms (no start, high idle, misfire etc.) Along with any prevalent Diagnostic Trouble Codes, aka DTCs, other forum members will be able to help you get to a solution more quickly and easily!

2000 cadillac sts 4.6 northstar

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3 years 3 days ago #48258 by Fastrider750
2000 cadillac sts 4.6 northstar was created by Fastrider750
rough idle,rich running no apparent vac leaks maf replaced been tuned and well maintained by owner no dtcs problem appeared suddenly.data for cts shows 62 f then 64 after 3 mins map data looks good can the coolant sensor be bad even though data looks good?

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3 years 3 days ago #48263 by Cheryl
Replied by Cheryl on topic 2000 cadillac sts 4.6 northstar
Maybe fuel pressure regulator leaking.

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3 years 3 days ago #48264 by John Curtis
Replied by John Curtis on topic 2000 cadillac sts 4.6 northstar
What are STFT and LTFT? What happens to those values of you raise rpm to 2500?
Also 02 data.
Making Pressure Differential Sensors (PDA Sensors) for pressure pulse diagnostics.
Currently servicing Central Texas.

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3 years 3 days ago #48267 by Hardtopdr2
Replied by Hardtopdr2 on topic 2000 cadillac sts 4.6 northstar
test the iac see if it moves to adjust idle when running rough. odds are it is sticking or going bad. would also be worth while to clean throttle body

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