grabbergreendart

my 03 neon has lost its power to climb hill on the hyway. have to drop it to 3rd for even the smaller hills. also noticed battery light is on and when got home the batt was dead. could that make ignition messed up? its a 03 2.0 16valve manual. any help?

mr340

I would start by checking the charging system, bad alternator will cause the car to run off of the battery, once the battery voltage drops the spark gets weak causing power loss.

grabbergreendart

also check engine lights been on for about a month. it is an o2 sensor thats about 90 bucks.

blue 68 gts

If the MIL is on for the o2 sensor, replace it.

The o2 sensor could be causing it to surge and have a loss of power. Gives off false readings of lean / rich air fuel mixtures.

If you continue to have the problem, go w/ what Mr 340 said.


Oh, is it an automatic or a 5 speed?

My girlfriends automatic PT Loser is REALLY GUTLESS going up hill. I have to tach it up to about 5k RPM to have any sort of power.

1966sportfury

yes! battery was dead. it would cause it to be short on power

grabbergreendart

found my charging problem. wire comes from harness into the pos part on starter. any ideas how to fix 100%? looks like someone had same prob but jimmy fixxed it with butt clamp and wrong wire.

grabbergreendart

grabbergreendart

so that wire is a fusible link. wire speck shows it needs to be a 12 ga black that goes from the pos wire on starter towards the generater. do i need to just run down to autozone and pick up link?

grabbergreendart

the trouble code is P 0420. Upward catyltic converter efficiency below threshold. any ideas fo the fix?

grabbergreendart

----P0420 Catalyst efficiency below threshold. My favorite, Here is why the code is set. Starting in 1996 every vehicle for sale in the U.S. had to have a way of monitoring Catalyst function. The job of the Catalytic Converter is to take Carbon Monoxide (a by product of internal combustion) and convert some of it back to Oxygen, this is done with three precious metals, temperature & fuel mixture. There is an Oxygen Sensor, or O2 sensor mounted in front of the Catalyst and one after. The ECM (Engine Control Module) uses data from the O2 sensors to know if the Catalyst is doing its job of creating Oxygen. Now the ECM does not constantly monitor the Catalyst system, this starts to get a bit complicated but depending on how the vehicle is being driven it is not always possible for the Catalyst to function properly as such in the ECM’s programming it will only monitor the Catalyst function after certain events have been met in a drive cycle. Once the ECM is looking at Catalyst it uses the voltage values created by the front and rear O2 sensors to determine if the Catalyst is working with in the programmed threshold. there are a couple of ways to properly test a Catalyst, but the most accurate way is to do a Catalytic Converter efficiency test. This test involves running the vehicle until it is up to temperature, then install a 4 or 5 gas analyzer probe into the tail pipe of the exhaust, then shutting the vehicle off, disabling spark and fuel (to keep the vehicle from starting), injecting propane into the intake manifold, and cranking the vehicle over and obtaining the readings from the gas analyzer. The reason for the test procedure is to remove the ECM, Mixture and O2 sensors from the loop, to purely test the Catalyst’s ability to function and it is a pass or fail test with a few Grey areas. It is not possible to simulate this test with a generic scan tool in the Auto parts store parking lot. A failed Catalyst is just one of many possible causes of this code and at the time of writing this article the list price for a one piece Catalytic Converter (found in most 1999 to 2004 models) from Subaru was $974.00 not including labor or gaskets. If the Catalyst is not the cause which is very possible and the culprit is a O2 sensor there are other possible ramifications of not repairing the vehicle properly. If the Catalyst has failed, reasons as to why need to be investigated to avoid a quick repeat of the failure. The number one cause we see at the shop is a failed head gasket allowing coolant into the exhaust and degrading the Catalytic Converter and or 02 sensors. But we have also seen contaminated gas, slow O2 sensors, and Mixture problems cause this as well. You have to remember the Catalyst function is measured by the ECM as seen through the “eyes” of the O2 sensors. If you live in Washington State and fail an Emissions test as a result of a check engine light and a PO420 code set, you can request they perform a tail pipe test and if it passes so should your car. Why is this? There is chatter that there is a disconnect in some cases between oxygen content in the exhaust and cars that will still run below the legal “measured” tail pipe Emissions standards for that year.

blue 68 gts

Yea, replace it.