idle issues... PCM is freakin out

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Sep 1, 2006 | 09:02 PM

dabe

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Staging Lane

Joined: Jul 2004

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From: Garner, NC

idle issues... PCM is freakin out

ok....i was at rpm today dialing in the 150 shot ....all went well with that....

jay, jeff and i decided on trying to fix my idleing issues....well....i definately have issues....

heres the problem...

reset the TPS sensor

turn the Key to run position but had the motor off.....and the TPS reads 0%

start the motor and it now reads 2%....thats just by starting the car...so the car is in part throttle tables now....idles like ****....the idle hunts around

now...we got the car rolling bout 20 mph on the dyno and stopped it and the tps went back to 0%....car idles fine!

we switched TPS's...same problem....

what yall think it is...PCM??

Sep 2, 2006 | 04:29 AM

ringram

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Joined: Aug 2005

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From: Sunny London, UK

Try reflashing a later year OS

Sep 2, 2006 | 12:49 PM

P Mack

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From: Phoenix

Did you mess with the tb or tb screw while adjusting the idle? Is it a FAST tb?

Sep 2, 2006 | 04:36 PM

dabe

Thread Starter

Staging Lane

Joined: Jul 2004

Posts: 81

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From: Garner, NC

stock tb...its definately closed....

i still dont get why when the car is off it reads 0 but when its started its 2....but if i roll the car 50 feet and stop its at 0.....

here are the codes i got after swapping pcms...

ok...swapped tb and pcm....NOTHING...same ****....

i got a whole bunch of old codes and an unknown

C0266 - Unknown (Current)
U1000 - Class 2 Communication Malfunction (History)
B0026 - LF/Driver Frontal Deployment Loop (Single Stage or Stage 1) Open (History) (Current) (Immature)
U1000 - Class 2 Communication Malfunction (History) (Immature)
C0240 - Unknown (History)
B1001 - Option Configuration Error (History) (Immature)
U1000 - Class 2 Communication Malfunction (History) (Immature)
U1301 - Class 2 Short to Battery (History) (Immature)
U1016 - Loss of Class 2 Communication with VCM (History) (Immature)
U1040 - Loss of Class 2 Communications with ABS (History) (Immature)
U1096 - Loss of Communications with IPC (History) (Immature)

Continuous Tests
Misfire: Complete
Fuel System: Complete
Comprehensive Component: Complete

Once Per Trip Tests
Catalyst: Complete
Heated Catalyst: n/a
Evaporative System: Incomplete
Secondary Air System: Complete
A/C System Refrigerant: n/a
Oxygen Sensor: Incomplete
Oxygen Sensor Heater: Incomplete
EGR System: Complete

Sep 2, 2006 | 05:06 PM

P Mack

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From: Phoenix

You could try loosening the tps mounting screws, and rotate it clockwise and hold it while you retighten it. That way the tps will read 0 when it's closed. If it's reading above 0%, the car will think you're holding the gas pedal open so it wont try to hold an idle with the iac.

Sep 2, 2006 | 05:07 PM

P Mack

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From: Phoenix

Those are some interesting codes. Maybe try checking all your ground wires.

Sep 2, 2006 | 05:48 PM

dabe

Thread Starter

Staging Lane

Joined: Jul 2004

Posts: 81

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From: Garner, NC

Quote:

Originally Posted by P Mack

the thing is...when i have the car off it reads 0%

when i start the car it jumps to 2%....

i drive the car 100 yards and come to a stop and it reads 0%