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Old 06-29-2014, 03:53 PM   #1 (permalink)
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Default P0171 / P0174 (possible vacuum leak?)

-I'm working on my girlfriend's 2004 Suzuki Verona to clear the following codes: P0171 P0174 P0300 P0301 P0302 P0303
-Her dad took it to a garage, and they changed the #5 cylinder coil and MAF (didn't clear the codes and cost over $400)
-My l/t fuel trim on both banks is high (25%+)
-I've changed all spark plugs (needed to anyway)
-The PCV valve appears to be clogged (have a replacement on order)
-Tested vacuum pressure on the manifold and it's OK (18-20" Hg)
-I *think* I hear a faint hiss towards the back of the engine, but I can't find it. I've checked all the lines I can see and sprayed carb cleaner with no noticeable result.

Next step? Suggestions? I need to clear these codes ASAP to pass emissions!
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Old 09-17-2014, 03:31 PM   #2 (permalink)
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Bump. Still no luck. Took it to the shop and they can't figure it out. They checked it for vacuum leaks and didn't find any. Next step??
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Old 12-05-2014, 04:23 PM   #3 (permalink)
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Same deal with my girlfriends 04 Verona. Loss of power at speed, MIL lit up, codes for misfires, mix is rich and O2 sensor bank 2 sensor 1 is slow to respond. 04 Verona is inline 6, #1 is on passenger side. There are 2 catalytic converters, one for bank 1 (cyl 1-2-3) and one for bank 2 (4-5-6). Each converter has upstream and downstream O2 sensors. When Verona runs rich due to misfire or bad O2 sensor, the cat converter(s) can overheat and melt down inside.

The gap on #6 plug was way wide. I replaced plugs, coils and both upstream O2 sensors and cleaned the MAF sensor (in the big pipe coming off the air filter) with Mass Airflow Sensor cleaner. It starts and idles fine, no more O2 code but still no power no acceleration & misfires in bank 2 at speed. Vacuum and compression are ok. Since its one bank, this seems to rule out vacuum, pcv, MAF or throttle issues. Suspecting clogged bank 2 rear catalytic converter, (the one toward the center line between engine and firewall) I removed the upstream O2 sensor from the cold engine to relieve any back pressure, engine ran with full power. Seems to confirm clogged rear cat converter.

So the dealer told me its 3 hours shop time because they have to go from the top and remove the intake manifold to get to it. Suzukipitstop.com (you can RENT the repair manual there for $3.95 for 24 hours) shows procedure from the bottom, maybe an hour.

My local muffler shop quoted me $1500 for the part. That's suggested retail from your good friends at Suzuki. I found it online for $215. Anybody know if that rear converter can be removed without taking off the intake manifold?
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Old 08-19-2015, 01:28 AM   #4 (permalink)
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Dude man what the heck yoy doing ? Dude I mean seriously your hard earned money isnt worth this pice of junk the miss fire will never be cleared this is indication of the engine approaching its death plz do us and your gf a favour and get rid of it NOW
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