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Questions about vehicle engines. Most engines in road-going vehicles are 4-stroke internal-combustion gasoline or diesel engines.

3 votes
Accepted

is there any way to adjust my idle speed - 2003 Cadillac CTS

Aftermarket tuners/PCM flashers (such as HP Tuners) will allow you to do this. However, HP Tuners costs about $600, so your best bet would be to find a friend or shop who already has one, unless you …
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  • 481
3 votes

Squeaking Noise when Cold Start. Suspect something wrong with belts, Also engine missing whe...

Simply pull one plug wire at a time and run the engine. The engine will run rough, but if the miss is still present, you know that the cylinder for which you pulled the coil pack is not faulty. … When you pull a plug wire and the miss is gone (the engine does not run much worse), then you have found the faulty coil pack. …
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2 votes
1 answer
2k views

Normal spark advance for 96 LT1 engine? STFT also varies bank 1 vs bank 2. What does it mean?

I used my HP Tuners as a scan tool on my 96 LT1 in an Impala SS. The "Advance" as read by the tool sits at -12 deg at idle, then goes down to -35 deg if I rev it (no load) to about 2k RPM. I'm interpr …
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