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Old 01-22-2017, 06:50 PM   #1
DButcher
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Default 2005 Saturn Ion 2.2 P0300 code

Hi, new member here.

I wanted to thank all the people that have shared their knowledge, i have learned allot.

I bought a 500 dollar car for my daughter, single mother starting over again.

The car would not start so i did the following:

charged battery
did compression test; 215 214 216 215
engine cranks and fires but will only run on fast idle, stalls, engine light on.
Codes: P0300, P0121, P0107
Cleared codes
Bought car for 500 and started reading this forum, thank you
installed new ICM, Coils, spark plugs
engine starts, idles at 7-800rpm, rough with rpm needle jumping +- 100rmp
test drive, runs good at speed, smooth, power to spare, good acceleration
engine light back on, P0300, P0121 rough idle but doesn't stall
Cleared codes
Cleaned MAF sensor, cleaned throttle body, new MAP sensor
engine starts, very cold day -15, High idle, 1,100 rpm to start, then as engine warmed up, smooth idle.
Took for test drive, all good for 10 minutes in city conditions went home
idling smooth in driveway, i turned the heater blower motor off, engine starts rough idle again, revs up just fine, rough idle back.
P0300 code again.

HElp!

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Old 01-22-2017, 07:39 PM   #2
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Default Re: 2005 Saturn Ion 2.2 P0300 code

Welcome to SaturnFans, DButcher! You've done good work thus far to have eliminated two of the three trouble codes! Since the P0300 DTC showed up again (Random Misfire Detected) you might consider replacing the spark plug boots. There could be a bad spark conductor wire (the spring-like item) which is partially or fully fractured over one or more of the spark plugs.

http://www.rockauto.com/en/catalog/s...ug)+boot,10150

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Old 01-22-2017, 07:40 PM   #3
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Default Re: 2005 Saturn Ion 2.2 P0300 code

swapped out another new ICM
Same rough idle
Injector balance test good
disabled each injector seperatly while running, each made difference to idle so i think their all fine.
unpluged, cleaned and repulgged all sensor and connectors

same rough idle

I sure don't want to take to dealership

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Old 01-22-2017, 07:42 PM   #4
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Default Re: 2005 Saturn Ion 2.2 P0300 code

Quote:
Originally Posted by pierrot View Post
Welcome to SaturnFans, DButcher! You've done good work thus far to have eliminated two of the three trouble codes! Since the P0300 DTC showed up again (Random Misfire Detected) you might consider replacing the spark plug boots. There could be a bad spark conductor (the spring-like item) wire which is partially or fully fractured over one or more of the spark plugs.
Yep, did that with coils, rubber boots, they were all together in one plastic piece that the ICM bolts into.

even tried 4 new plugs, thats 8, i'll have extras. T

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Old 01-23-2017, 01:33 PM   #5
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Default Re: 2005 Saturn Ion 2.2 P0300 code

Quote:
Originally Posted by DButcher View Post
swapped out another new ICM
Same rough idle
Injector balance test good
disabled each injector seperatly while running, each made difference to idle so i think their all fine.
unpluged, cleaned and repulgged all sensor and connectors

same rough idle

I sure don't want to take to dealership
Pierrot mentioned spark plug boots? New? Total miles on car? Did you use dielectric grease the NEW boots?

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Old 01-23-2017, 07:46 PM   #6
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Default Re: 2005 Saturn Ion 2.2 P0300 code

HI,

05, 120,000 miles. 215 psi compression. Timing chain or tensioner has not been done. no noise from timing chain on cold start up or other time.

Yes, new rubber boots came with the duel coil pack, yes used Dielectric grease on boots. The scanner shows random missfire on all 4 cylinders, not just one. no missfires when running 1200 rpm and higher

New: ICM, Coils, plugs, rubber boots, MAF, MAP,

Cleaned throttle body interior. Cleaned all connectors to sensors.

I guess O2 sensors next, maybe get the TPS checked.

Did i read somewhere that TPS need to be reset? battery off for 10 min?

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Old 01-24-2017, 10:57 AM   #7
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Default Re: 2005 Saturn Ion 2.2 P0300 code

Check for damaged wiring around the front right part of the engine around the oil filter and where the engine & transmission come together. There is a TSB that says a frayed wire in this area causes an intermittent short to ground which causes a misfire. I was unable to find a copy of this TSB to link.

There is another TSB that says the ECM may have memory loss due to low voltage/battery being disconnected and needs to be reprogrammed (link here).

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Old 01-26-2017, 07:41 PM   #8
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Default Re: 2005 Saturn Ion 2.2 P0300 code

Update

Thanks for all the tips.

Took car into GM to diagnose, gave then 2 hours max.

They first told me the timing Chain needs to be replaced!! 1800-2000 $$
I told them they are wrong, if chain was skipped compression would not be 215 and the car would not run great under load. Good try you Bandits

called back and said the PCM was not communicating, I asked them if they mean the ECM, no they argued there is an ECM and a PCM???

A little reaseach proves they really have no friggin clue.

279.00 bucks later and they can't be sure. But some preasure test proved the catalytic converter is good

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Old 01-26-2017, 11:31 PM   #9
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Default Re: 2005 Saturn Ion 2.2 P0300 code

1-Your Ion has; one engine control module (ECM), one body control module (BCM), a drive by wire system consisting of an electric throttle actuator/electronic pedal/ecm, anti-lock brake module, airbag module, etc.. Why your local GM dealer can't differentiate between ecm, pcm and bcm is a mystery but as long as you're willing to leave your credit card I'm sure they'll figure it out as long as you're paying....... Its a good thing you declined their offer to continue diagnosing. Some call this phase 'guessing'. And GM is supposed to have well trained technicians. Perhaps this dealer fell short of sending techs to school?

2-Its funny how GM claims no communications with the pcm (actually ecm) when the error codes (P0300 and P0121) are ecm diagnostic errors relayed to the bcm to output to the OBD II connector. Yeah, there's definitely a comm problem........between a tech and using their expensive sophisticated Tech II scantool compared to you using (what did you use to decode these errors?) a much less sophisticated reader most of us try not spending too much money on to retrieve check engine light codes.

My OBD Wiz on tablet cannot read/display the precat O2 sensors but will display the post cat sensors. It was confirmed recently with some email enquiries. Despite this flaw, its an excellent tool. I still use it to have info for all around troubleshooting and saved $$$$ instead of paying anyone (dealer, repair shop, specialist) to read and fix most problems.

3-At 120k miles and the catcon (proven to be clear?) not blocking exhaust flow suggests other issues not explored. Tried a fuel pressure test with a loaner (Autozone, Advance Auto)? With advanced mileage, tests are needed to rule out things not addressed. Fuel filter replaced (every 100k miles)?

Replacing the map sensor corrects for P0107 but may not be the end of it. P0300 for general misfire is explained in the service manual starting with the crankshaft sensor outputting precise timing signals to the ecm in order for the ecm to operate the entire EFI system. Its difficult to prove a faulty crank sensor is contributing to this problem - the majority of crank sensor symptoms are; intermittent failures related to engine heat, outright failure and partial failure with strange engine running problems. Partial failures with the engine running seemingly fine but with issues not easily identified are the most difficult to diagnose and may need GM's Tech II to monitor crank sensor signals. For the rest of us, replacing it is the only option on the chance its faulty.

4-O2 sensor monitoring; the precat sensor varies voltage output between 0.1-0.9 volt and may be seen on a reader. The post cat O2 sensor displays a non varying voltage as a result of measuring catcon efficiency.

Last edited by fdryer; 01-26-2017 at 11:46 PM..

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Old 01-27-2017, 11:25 AM   #10
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Default Re: 2005 Saturn Ion 2.2 P0300 code

fdryer

Thanks, kinda over my head on some stuff but thanks none the less.

Don't know the brand my son's auto tech buddy used, but it was a shop model from where he works, looked expensive.

I"m going to try and autowreckers for a ECM today, will try and take as many sensors and such as possible.

Question, Do I take it to GM to get flashed or does it have to be installed in vehicle. Looking for a procedure.

I'm getting to the point of no return, i'm into this little car for allmost what it's worth.....................

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Old 01-27-2017, 02:43 PM   #11
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Default Re: 2005 Saturn Ion 2.2 P0300 code

All used/donor ecm/bcm/pcm can be reused without GM reprogramming them insofar as mating them to an existing vehicle. GM's factory theft system, Passlock, shares a fuel password between engine computer and bcm that must be relearned when transferring modules from one vehicle to another. GM created two methods, a ten or thirty minute procedure; ten minutes using GM's Tech II scantool or thirty minute procedure without it. The thirty minute procedure is used at home but the remotes are lost and must be programmed by GM.

30-Minute Learn Procedure

Turn ON the ignition, with the engine OFF.
Attempt to start the engine, then release the key to ON. The vehicle will not start.
Observe the SECURITY telltale. After approximately 10 minutes, the telltale will turn OFF.
Turn OFF the ignition, and wait 5 seconds.
Repeat steps 1-4 two more times for a total of 3 cycles/30 minutes. The vehicle is now ready to relearn the Passlockô Sensor Data Code and/or passwords on the next ignition switch transition from OFF to CRANK.

Important

The vehicle learns the Passlockô Sensor Data Code and/or password on the next ignition switch transition from OFF to CRANK. You must turn the ignition OFF before attempting to start the vehicle.

Start the engine. The vehicle has now learned the Passlockô Sensor Data Code and/or password.
With a scan tool, clear any DTCs if needed. History DTCs will self clear after 100 ignition cycles.

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Old 01-27-2017, 06:42 PM   #12
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Default Re: 2005 Saturn Ion 2.2 P0300 code

Great, thanks

found one at autowreckers from 05 ion, 100 bucks

we'll see tomorrow if the GM Tech got this diagnoses correct for the 270.00 bucks

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Old 02-04-2017, 09:12 PM   #13
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Default Re: 2005 Saturn Ion 2.2 P0300 code

Hello

Just an update for anyone who might learn from this.

Apparently someone, before i bought it, installed a wrong used ECM!

And ontop, the one i got from the wrecker, with matching numbers, is the same, which is wrong! Returned and found the proper 12599726 ECM

So after plugs, coils, rubber boots, ICM, Timing chain tensioner, MAP sensor, etc. etc, with hours spent trying to figure out this damn engine

It runs like a top.

Cheers

always double check to make sure an old vehicle has the correct parts to start with. Double check

Thanks everyone for the help

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Old 02-05-2017, 12:15 PM   #14
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Default Re: 2005 Saturn Ion 2.2 P0300 code

You have spare ignition parts for future troubleshooting

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