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Old 12-10-2014, 03:31 AM   #1
CaptainMouse64
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2002 SL1
Question Check engine light on have OBD codes.. help?

Hi everyone. So the check engine light came on. I hooked up my OBD scanner and it produced these codes:



As you can see, 2 codes popped up

P0442
P1301

I also have this data taken from the scanner:




The engine starts rough and I am losing power during acceleration, very noticeable on hills. I also have a rough idle where the RPM'S do not hold steady and go from 800 to 1,500 RPM'S at random. Vibration in the cabin very noticeable. I have also heard a water rushing sound and/or "sloshing" near the front passenger side towards the engine. Almost always on start up, and vanishes when the engine gets hot. It does not always happen but seems directly related to how cold it got the previous night. I tested the anti-freeze with a tester it registered OK and I did a complete flush a year ago. I change the oil on time religiously and use Mobil 1 filters and high milage full synthetic oil. Transmission fluid was replaced before car went in long term storage. All fluids are topped off and check weekly. I have not noticed a leak in the cooling system and no drips appear after the car is parked for a long time.


The car was in long term storage for 3 months and was taken out of mothballs and has been running fine for 2 weeks. The problems started when it started to go under 32 degrees outside and freezing weather, etc.

Any help would be most welcome, I feel something ominous is taking place as the old girl has never run this choppy before.

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Old 12-10-2014, 11:54 AM   #2
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Default Re: Check engine light on have OBD codes.. help?

Storage for any length of time presents a host pf problems besides normal wear and tear of every day use.

Are you using OBD Wiz or Scantool? The screen copy seems to be similar to my OBD Wiz from Scantool. Nice toy after some familiarization.

P1301 doesn't exist so this can be eliminated altogether. P0442 may be the typical gas cap gasket seal not sealing completely and either needs some grease to rejuvenate dry rot or cap replacement. Examine the cap carefully and gas neck for debris preventing a good seal. Evaporative emissions tests check for low pressure and vacuum in the entire fuel system and gas caps are the first place to check. It gets complicated after this.

A small evap system leak doesn't cause poor engine running so you may have more than one problem. Storage for any time presents unusual problems; rotting parts from corrosion already occurring, critters nesting in places to clog air flow, chewing thru wiring, etc..

What's odometer mileage? If high, ever consider a catalytic converter disintegrating as time and mileage goes by? A clogged exhaust system (think constipated) can be a mystery problem unless a simple test is tried; removing the front pre-cat O2 sensor for an alternate exhaust hole and a brief LOUD drive. If engine power is suddenly restored, replace the catcon. Other issues may cause erratic engine problems too.

Dirty/clogged air filter? Worn spark plugs? Corrosion on ignition system parts?

The technical (geek) chart appears to display your engine during cold start running @1175 rpm with engine coolant temperature @102.2F and parked (0 speed).

Next time, if you're curious and want to learn more, try logging/recording (unless its automatic) or take a 'snapshot' at speed, preferably with someone riding shotgun to manipulate the software while you drive. Pick a stretch of straight road lasting at least 5 seconds at whatever speed you choose to record values. Recording values at any steady highway speed will add more information for more info about engine operations. This can be used as a baseline/database to compare normal engine runs to everything else not normal. One or several warm idle normal snapshots along with chosen speed snapshots are sufficient to use for troubleshooting later when problems occur.

Last edited by fdryer; 12-10-2014 at 11:59 AM..

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Old 12-10-2014, 12:21 PM   #3
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Default Re: Check engine light on have OBD codes.. help?

Errr, just noticed OBD wiz in the header...............

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Old 12-13-2014, 08:29 AM   #4
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Default Re: Check engine light on have OBD codes.. help?

It'll take a week or so but, you might consider getting the fuel injectors professionally cleaned and rebuilt. I had a car that had sat up burn a valve because of that. I use Witchhunter performance for cleaning but, if you have a local shop with the equipment that's the way to go.

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