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Misfire help
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<blockquote data-quote="austin21" data-source="post: 17039644" data-attributes="member: 205451"><p>So I’ve almost narrowed it down to a few things. My compression test kit just got here today. Going to perform that this weekend</p><p></p><p>Here are my findings so far:</p><p>- All 8 spark plugs are new (same ones from initial replacement)</p><p>- coils are new, tested spark with each one.</p><p>- Fuel injectors are good, fuel is also getting into bank 1 (evidence on the spark plugs)</p><p>- verified power and ground to the fuel injector connectors with a power probe. Each connector was getting 12v and good ground.</p><p>- replaced both bank 1/2 o2 sensors before the cats</p><p>- tested alternator for shits and giggles. That’s fine.</p><p>- reset the KAM with SCT tuner after all of that. No change.</p><p></p><p>After letting the car run to get up to temp. The driver side (bank 2) high flow cat gets up to 400 Fahrenheit. Bank 1 cat is only 150 degrees.</p><p></p><p>What I haven’t ruled out:</p><p>Compression test - is this a low probability considering all 4 cylinders on bank 1 appear to be misfiring?</p><p></p><p>ECU issues - who knows, current ECU was a refurb.</p><p></p><p>Fuel pressure - the fuel pressure test kit I got didn’t have the right adapter. So I will be looking at this again if compression test is good.</p></blockquote><p></p>
[QUOTE="austin21, post: 17039644, member: 205451"] So I’ve almost narrowed it down to a few things. My compression test kit just got here today. Going to perform that this weekend Here are my findings so far: - All 8 spark plugs are new (same ones from initial replacement) - coils are new, tested spark with each one. - Fuel injectors are good, fuel is also getting into bank 1 (evidence on the spark plugs) - verified power and ground to the fuel injector connectors with a power probe. Each connector was getting 12v and good ground. - replaced both bank 1/2 o2 sensors before the cats - tested alternator for shits and giggles. That’s fine. - reset the KAM with SCT tuner after all of that. No change. After letting the car run to get up to temp. The driver side (bank 2) high flow cat gets up to 400 Fahrenheit. Bank 1 cat is only 150 degrees. What I haven’t ruled out: Compression test - is this a low probability considering all 4 cylinders on bank 1 appear to be misfiring? ECU issues - who knows, current ECU was a refurb. Fuel pressure - the fuel pressure test kit I got didn’t have the right adapter. So I will be looking at this again if compression test is good. [/QUOTE]
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