Rough idling, code P1345? [Archive] - Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum

: Rough idling, code P1345?


redtb
09-10-2006, 11:07 PM
I just bought a 2002 Trailblazer LS with 90K on it. I've had it for about a week now. It ran great, sounded great, and drove great until yesterday, after I filled up on gas. While I was parking at my house, I noticed that the engine was running rough at low RPM, but it smoothed out when I revved it. But soon the SES light came on. I have one of those IBDII gadgets so I hooked it up and it gave me error P1345 - "Manufacturer Controlled Ignition System or Misfire." Could bad gas have made it run rough? Everything was fine until I filled up.

The whole situation is odd. It was just inspected a week ago, the engine is very clean, and the rough idling only happens once in a while. Sometimes the engine dies at stop signs. But other times it is smooth as silk when I stop. When I clear the error codes, the engine runs like new, but the error is persistent, coming back at random times. Help! :cry:

VIN 1GNDT13S122161905

chester0001
09-11-2006, 06:27 AM
I just bought a 2002 Trailblazer LS with 90K on it. I've had it for about a week now. It ran great, sounded great, and drove great until yesterday, after I filled up on gas. While I was parking at my house, I noticed that the engine was running rough at low RPM, but it smoothed out when I revved it. But soon the SES light came on. I have one of those IBDII gadgets so I hooked it up and it gave me error P1345 - "Manufacturer Controlled Ignition System or Misfire." Could bad gas have made it run rough? Everything was fine until I filled up.

The whole situation is odd. It was just inspected a week ago, the engine is very clean, and the rough idling only happens once in a while. Sometimes the engine dies at stop signs. But other times it is smooth as silk when I stop. When I clear the error codes, the engine runs like new, but the error is persistent, coming back at random times. Help! :cry:

VIN 1GNDT13S122161905

Heres a couple of non expensive steps that can resolve this.
1 new fuel filter (its under the truck in the left frame)
2 clean throttle body
3 run some injector cleaner in your gas tank
4 pull the coils and clean or change the plugs (normally they dont need changing before 160000 km) but if youre at 90000 miles they are probably due.

tblazed
09-11-2006, 09:09 AM
Looked up that code...

P1345 GM "Camshaft To Crankshaft Position Correlation Fault"

Maybe a sensor ( camshaft or crankshaft position) is failing or has a bad connection at the plug.



Codes can be looked up here..

http://www.iequus.com/support/obd2_definitions.php

04TBEXT
09-11-2006, 09:36 AM
redtb,
Check this out...


Document ID# 1588416
2002 Chevrolet TrailBlazer - 4WD


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Subject: SES Light with a P1345 or P0016 and a Possible Rough Idle - kw 4.2 camshaft condition control DTC idle intermittent light LL* MIL performance poor repair rough solenoid #PI00156C - (01/26/2005)



Models: .




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The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in the PI.

Condition/Concern:
Some 2002 - 2004 models that are equipped with the 4.2L (VIN S - RPO LL8) engine may experience a SES Light due to a P0016 or P1345 DTC and a possible rough idle.

Recommendation/Instructions:
If the SI diagnostics do not isolate a cause, the following information may help:

• Control of the Cam Phaser Actuator solenoid is inhibited when a P0016 (04 Model Year) or P1345 (02 - 03 Model Year) DTC is stored.


• If this DTC started after recent internal engine repairs, inspect for proper engine mechanical timing. With the camshaft cover removed and the #1 cylinder at top dead center, make sure that the darkened chain links are lined up with the alignment marks on the exhaust and intake cam sprockets. At this point, J44221 should fit over the rear cam flats and the word Delphi (on the front of the Cam Phaser Actuator sprocket) should be parallel with the front edge of the cylinder head. Note: It may take up to 14 crankshaft revolutions before all timing alignment marks line up with each other.


• Engines built after 2/5/01 include a thin friction washer (P/N 12573950) between the dampener and the crank gear and the torque specification was increased to 110 ft-lbs plus 180 degrees to prevent crankshaft gear and alignment pin damage. If there is any history of the crank dampener bolt ever being loose, the crankshaft gear and alignment pin may be damaged, which can cause these DTCs.


• If a P0016 or P1345 is resetting without any engine performance concerns but the SI diagnostics and the above information did not isolate a cause for the DTC, replace the Cam Phaser Actuator sprocket.


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Please follow this diagnosis process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed.

Models:
(04 Buick Rainier S1 T1 with the 4.2L engine) and (02 03 04 Chevrolet TrailBlazer S1 T1 with the 4.2L engine) and (02 03 04 GMC Envoy S1 T1 with the 4.2L engine) and (02 03 04 Oldsmobile Bravada S1 T1 with the 4.2L engine)

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GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the information.
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Document ID# 1588416
2002 Chevrolet TrailBlazer - 4WD