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2004 Chevy Impala 3800 vacuum line diagram

My 2004 impala (3800 engine) is misfiring. It was lean and I replaced the O2 sensor but it is now misfiring at 2500 rpm. It misfires regularly when I give it gas. on the open road, it begins misfiring at 35 mph. I replaced the plugs and wires also. I found a vacuum hose that was cracked and replaced it but I wonder if there are others and this could be the cause of the misfire.

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6ya6ya
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Posted on Jan 02, 2017

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SOURCE: I got 96 chevy c2500 pickup, 5.7 vortec, engine

Check your bank 2 plugs for colour (do they look hot like they running hot ). Check you EGR Exhaust Gas Recirculation valve (looks like a 80mm diameter spaceship with a vacuum line to the top of it) If this remains closed the engine runs very hot and causes misfire. Possible causes are EGR not opening are 1) perforated diaphragm 2) encrusted valve stem 3) clogged exhaust gas feed pipe. A quick check for function: run the engine and remove the vacuum tube. The engine note should change as the tube is connected and then disconnected. Also pushing on the underside of the EGR with your fingers to lift the diaphragm to open the valve should also result in change in engine note. If its not working just disassemble the EGR and clean with carb cleaning spray, also clean the exhaust gas feed pipe likewise.

Posted on May 04, 2010

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SOURCE: Engine code: Misfire cylinder 1. Replaced plugs

There should be no built up fuel or oil in cylinder. The fuel will be burned off immediately, and there should have been very little unless you have a leaking injector. The only way oil will enter the cylinder is if you have a mechanical failure like worn rings or leaking valve seals.If after replacing the plugs and wires did not correct all or the skip after the first start up and road test then you have another issue causing the skip

Posted on May 23, 2010

emissionwiz
  • 76164 Answers

SOURCE: have 2004 chevy impala 3.4lt idles rough stalls at stops cel on code reads multiple misfires bank one lean replaced plugs, wires,and all 3 coil packs

Please read the info on this at this LINK

Posted on Jun 14, 2012

Testimonial: "Thank you. Found a leaking fuel pressure regulator leaking into the vacuum line. Replaced it, and engine runs great, idles smooth, but now it will not start when engine is cold. Can you help with this?"

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2001 Chevy Impala 3.8L. P0171 lean fuel code. We have replaced the MAF from a previous code. O2 sensors scan good, as does the fuel pump all within specs. Car is running like junk. 81K, Dropped Cat...


DTC P0171 - System Too Lean (Bank 1)
Basically this means that an oxygen sensor in bank 1 detected a lean condition (too much oxygen in the exhaust). On V6/V8/V10 engines, Bank 1 is the side of the engine that has cylinder #1.

Note: This DTC is very similar to P0174, and in fact your vehicle may show both codes at the same time.

According woth your previous tasks, inspect all vacuum and PCV hoses, replace if necessary.

Oct 04, 2011 | 2004 Chevrolet Impala

1 Answer

I have a 05 chevy impala check engine code p0036 n p0142 bank one sensor two which sensor do I replace


If you have access to a scan tool, check the signal voltage for the Bank 1,3 oxygen sensor with the engine at normal operating temperature. Is it stuck low currently? If so, increase RPM for a few seconds and see if it affects the reading. If it begins working with increased RPM, check for holes in the exhaust near the O2 sensor that may cause a false lean. If the exhaust pipe is intact, the sensor is sluggish, replace it. If the Bank 1,3 O2 sensor voltage reading remains low with increased RPM, unplug it and then observe the reading. It should have increased to about 0.5 volts or thereabouts. If it did, check for water intrusion or other connector problems. If none are found, replace the shorted O2 sensor.

Jul 14, 2011 | 2005 Chevrolet Impala

2 Answers

03 impala, Car has minimum power 0-30 and then full power...Why?


if it said bank 1 lean, probaly it is an o2 sensor, but if bank 1 and 2 are lean then you have a vacuum leak. a hose or the intake. was there 1 code or more?

Aug 12, 2009 | 2003 Chevrolet Impala

2 Answers

Chevy impala2002


A P0300 code is a random cylinder misfire code and could be caused by a bad plug, plug wire, or fuel injector. The P0171 is bank one o2 sensor is reading lean w/ both of these combined could mean a vacumm leak.. Hope this helps.

Nov 26, 2008 | 2003 Chevrolet Impala

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