Ghost in my dash
New Member
Joined: 07-02-07
Posts: 119
Likes: 0
From: Lake Echo, NS
Both the tach and the speedo are electronic gauges that are connected through the ecu. What you are seeing as pulses is the charge bleeding off some of the capacitors within the ecu unit. It is totally normal.
What was really strange was the gremlin in the original ecu programming on the 2005 models that would blink the highbeam and brake light in the dash at totally random intervals every couple days while driving. Made me think I was seeing things for the first 2 months I had the car. A re-flash as the dealer with an upgraded program fixed it.
What was really strange was the gremlin in the original ecu programming on the 2005 models that would blink the highbeam and brake light in the dash at totally random intervals every couple days while driving. Made me think I was seeing things for the first 2 months I had the car. A re-flash as the dealer with an upgraded program fixed it.
Senior Member
Joined: 04-07-07
Posts: 1,765
Likes: 0
From: Cincy
it's some type of self cleaning process for something, i forget. Search for it, it has been explained
#PIC4317C: Noise From The Rear Of Vehicle - keywords canister cold CVS click evap knock L61 LE5 solenoid tick vent - (Jan 31, 2008)
Subject: Noise From Rear of Vehicle
Models: 2006-2007 Saturn ION
2006-2008 Chevrolet Cobalt
2007-2008 Pontiac G5
2006-2008 Chevrolet HHR
2005-2008 Pontiac Pursuit
with Engine RPO L61 or LE5
This PI was superseded to update models and model years. Please discard PIC4317B.
The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.
Condition/Concern:
A noise may be heard from the rear of vehicle; typically 3-5 knocks during initial cold start. The noise may sound like someone outside of the vehicle is tapping on the back window or on the rear exterior body panels.
Recommendation/Instructions:
This noise is from the vehicle's EVAP canister vent solenoid going through the diagnostic cleaning cycle, which is part of the software calibration set-up. Replacing the EVAP canister may not resolve the issue when the vehicle is re-exposed to a cold start. No parts should be replaced. This should be considered a normal condition for 2008 and previous model years.
Please follow this diagnostic or repair 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.
#PIC4317C: Noise From The Rear Of Vehicle - keywords canister cold CVS click evap knock L61 LE5 solenoid tick vent - (Jan 31, 2008)
Subject: Noise From Rear of Vehicle
Models: 2006-2007 Saturn ION
2006-2008 Chevrolet Cobalt
2007-2008 Pontiac G5
2006-2008 Chevrolet HHR
2005-2008 Pontiac Pursuit
with Engine RPO L61 or LE5
This PI was superseded to update models and model years. Please discard PIC4317B.
The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.
Condition/Concern:
A noise may be heard from the rear of vehicle; typically 3-5 knocks during initial cold start. The noise may sound like someone outside of the vehicle is tapping on the back window or on the rear exterior body panels.
Recommendation/Instructions:
This noise is from the vehicle's EVAP canister vent solenoid going through the diagnostic cleaning cycle, which is part of the software calibration set-up. Replacing the EVAP canister may not resolve the issue when the vehicle is re-exposed to a cold start. No parts should be replaced. This should be considered a normal condition for 2008 and previous model years.
Please follow this diagnostic or repair 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.
Last edited by bgbearcatfan; May 16, 2008 at 07:07 PM. Reason: Automerged Doublepost
Senior Member
Joined: 12-12-05
Posts: 5,456
Likes: 0
From: Moosomin, Saskatchewan
Jeese, people worry about the littlest things. If i had a tire fall off, i'd worry. Some needles pulsing? woop-dee-do.
Mine hasn't done either of these, anyway (pulsating needles or clunk in the trunk).
Mine hasn't done either of these, anyway (pulsating needles or clunk in the trunk).
Senior Member
iTrader: (1)
Joined: 02-08-08
Posts: 3,726
Likes: 0
From: Fayetteville/Linden, NC/Myrtle Beach, SC
You should go back and smack them in the face. It is one of two things, if while running it is solinoids in the evap system, if parked it is the fuel pump. Both completely normal unless you have less than 1/4 tank of gas or 3/4 tank of gas and the evap solinoids still sound. The car is not capable of exicuting a evap test unless it is between 1/4 and 3/4 tank.
Senior Member
Joined: 03-14-06
Posts: 1,230
Likes: 0
From: missouri
my 06 ss/sc does it what it is when the guages loose total power the servo's / motors go into a rested settled posistion. once u turn on your key they do back to the 0 rpm and 0 mph.
like others have stated there is nothing to worry about i noticed this same problem when i was doing my clearing behind my guages to get ready for a color change..
its totally normal now for the trunk thing i have never herd it
anyways later and have a good night sleep
like others have stated there is nothing to worry about i noticed this same problem when i was doing my clearing behind my guages to get ready for a color change..
its totally normal now for the trunk thing i have never herd it
anyways later and have a good night sleep
Senior Member
Joined: 10-14-06
Posts: 3,623
Likes: 1
From: Vancouver, BC
Thread
Thread Starter
Forum
Replies
Last Post
