Changed Cat and pre cat in Feb 2014 Changed 4 Sparks in july 2014 Changed 2 coil packs in july 2014 changed coil pack connector in sept 2014 due to open connection causing p0304 code changed gasket between cat and resonator last month. Things still to do: Change Valve cover smoke test check for oil in spark check cat efficiency
Those cars are notorious for engine problems unfortunately. The exhaust valves tend to warp from heat after around 200k miles. Therefore throwing the O2 codes. Best outcome and cost effective thing I can recommend is replacing the engine with a new or low mileage engine.
Testimonial: "Ok guys sorry for the long delay. I have figured out in the time i spent messing around that it was a couple of things that gave me trouble. _________________P0420 Code_____________________ 1. bank 1 o2 sensor was bad 2. there was a crack in the exhaust pipe _________Misfire or random misfire code_________ 3. I also had oil on the coil pack that eventually gave me the P0303 code. 4. Valve Cover was bad 5. Alternator failed 6. Spark tube seals are bad _____________Things Im still not sure of________ 7. Smoke from the tailpipe (once every 2 weeks) but just cleared itself up (??) 8. Oil soaked coil pack #4 (no malfunctions) not sure why there is oil there. 9. rattling at low rpms (could be a heat shield) 10. P0420 code still crops up. No performance related issues present (is it stuck in the system)"
SOURCE: 2003 grand am 3.4 code p0304
More likely a plugged injector as that code is specific to cylinder # 3 These engines are also very prone to failed intake manifold gaskets and stuck valve lifters. I think I'd start with a compression test, if that's good, go injector. If the compression is bad, you've got a can of worms. Hold off on the O2, I don't think it's related.
SOURCE: service engine light comes on , p0420 code
the light can be caused by any one or combination of over 200 trouble codes, go to any kragen or Autozone parts store and ask for a trouble code test, it is free, then record the code(s) they come up with and post them back on fixya
SOURCE: No spark from coil pack
The most common reasons for them going out are not using dielectric
grease properly when installing, and from washing your engine.
I believe this was a huge issue with Volkswagen vehicles
SOURCE: 2003 chev malibu wont start due to lack of spark
That car has 2 crank sensors , did you replace both? One is at the front crank pulley and the other is behind and low on the engine block, above oil pan. Be sure the ICM (ign control module has a good ground, (black wire) it grounds at a bracket where the trans bolts to the engine approx at the 2 o'clock position.
Testimonial: "the check the ground was a good suggestion, i will do that at my first opportunity"
SOURCE: 04 Pontiac Vibe bad gas mileage without a code and then the p0420
that code is from having the plugs wires reversed as you did and the o2 senors regrsitered the overload on gas emmions once you remove the battery cables for about 5 minutes and then recconect and run the engine it should be okay
reading should be fairly steady. Typically the P0420 code triggers the Check Engine Light if the readings of the two sensors are similar. This is indicative of (among other things) a converter that is not working as efficiently as it should be (according to specs). It is part of the vehicle emissions system.243 views
Usually answered in minutes!
×