Pontiac

Pontiac Problems? Ask a Mechanic for Answers ASAP

Ask an Expert,
Get an Answer ASAP!

Pontiac
This answer was rated:

What does the camshaft position actuator solenoid do?

On earlier engines, they incorporated and EGR valve to help lower emissions. By recirculating the exhaust gases, not only were the valves cooled, (thus the introduction of unleaded gas) but harmful exhaust gases were lowered. The EGR valve was one of the BIGGEST innovative enhancements for gas engines in the late 80's, early 90's.

With the sophistication electronics, we can now control engine valve timing by turning the camshaft as the engine is running. This is done with oil pressure to these valves and special "camshaft reluctors" on the cams themselves. By controlling valve timing, (for emissions and cooling the valves) we can eliminate the EGR valve. 

It is extremely important to keep the engine oil clean as the camshaft solenoids have a fine mesh screen to only allow clean oil in. 

These valves are expensive. In the neighborhood around $100.00. 

Read full interaction below »
Ask Your Own Pontiac Question

Resolved Question:

What is "cam solenoid" and estimated cost of parts?
Submitted: 7 years ago.
Answered in 22 minutes by:
5/30/2010
Mark
Mark, ASE Certified Technician
Category: Pontiac
Satisfied Customers: 847
Experience: 34+ yrs Dealership Exp. - Fully State & ASE Certified - GM Master & GM World Class Tech
Verified
Greetings, my name is Mark.

I can only assume what you are in reference to as your terminology is really not used. Camshaft position solenoid actuator is about as close as I can come.

On earlier engines, they incorporated and EGR valve to help lower emissions. By recirculating the exhaust gases, not only were the valves cooled, (thus the introduction of unleaded gas) but harmful exhaust gases were lowered. The EGR valve was one of the BIGGEST innovative enhancements for gas engines in the late 80's, early 90's.

With the sophistication electronics, we can now control engine valve timing by turning the camshaft as the engine is running. This is done with oil pressure to these valves and special "camshaft reluctors" on the cams themselves. By controlling valve timing, (for emissions and cooling the valves) we can eliminate the EGR valve.

It is extremely important to keep the engine oil clean as the camshaft solenoids have a fine mesh screen to only allow clean oil in.

These valves are expensive. In the neighborhood around $100.00.

Hope this helps shed a little light.

Below is a description of the system.

Camshaft Actuator System Description

Camshaft Position (CMP) Actuator System

The camshaft position (CMP) actuator system is used on both the intake and exhaust camshafts. The CMP actuator system is used for a variety of engine performance enhancements. These enhancements include lower emission output through exhaust gas recirculation (EGR) control, a wider engine torque range, improved gas millage, and improved engine idle stability. The CMP actuator system accomplishes this by controlling the amount of intake and exhaust valve overlap.

CMP Actuator System Operation

The camshaft position (CMP) actuator system is controlled by the control module. The control module sends a pulse width modulated 12-volt signal to each CMP actuator solenoid to control the amount of engine oil flow to a camshaft actuator passage. There are 2 different passages for oil to flow through, a passage for camshaft advance and a passage for camshaft retard. The camshaft actuator is attached to each camshaft and is hydraulically operated to change the angle of each camshaft relative to crankshaft position (CKP). Engine oil pressure (EOP), viscosity, temperature, and engine oil level can affect camshaft actuator performance. The control module calculates the optimum camshaft position through the following inputs:

Engine speed
Manifold absolute pressure (MAP)
Throttle position indicated angle
CKP
CMP
Engine load
Barometric pressure (BARO)

A locking pin keeps the CMP actuators in the parked position to avoid valve train noise upon engine start-up. The parked position is 0 degrees of camshaft actuation. The locking pin will release the actuator after the EOP is sufficient to overcome the locking pin spring pressure. The exhaust CMP actuators also have return springs. The return springs are necessary to assist the CMP actuators to return to the parked position due to the rotational inertia of the valve train components upon engine shutdown. The control module uses the following inputs before assuming control of the CMP actuator:

Engine coolant temperature (ECT)
Closed loop fuel control
Engine oil temperature (EOT)
EOP
Engine oil level
CMP actuator solenoid circuit state
Ignition 1 signal voltage
BARO


camshaft position (CMP) actuator solenoid valve.
Object Number:(###) ###-#### Size: SH
Mark
Mark, ASE Certified Technician
Category: Pontiac
Satisfied Customers: 847
Experience: 34+ yrs Dealership Exp. - Fully State & ASE Certified - GM Master & GM World Class Tech
Verified
Mark and 87 other Pontiac Specialists are ready to help you
Ask your own question now
Customer reply replied 7 years ago
Would synthetic oil minimize the problem? What would be estimated cost of repair?
Hello back and thank you so much for your payment. You're most generous.

Usually when the these solenoids fails, it is a hard failure. You will need to have them replaced. By looking at the repair procedure, I can't imagine the cost for labor being too intensive.

I only say that because I have never seen these fail on your engine. AND, I only say that because I want to encourage you to have your car fully checked out and diagnosed by a qualified repair facility. Sometimes code numbers only point you in the direction of a needed repair.

In your case, you could have what these solenoids are controlling that is the issue. It may not be the solenoids themselves. It could be the actuators. It also could be the cam sensors themselves.

I have worked on numerous engines (other than yours) that have the double overhead cam system. I have put cams, actuators, and even cylinder heads on these engines for codes that indicate the correlation between the cam and crank is off.

Thanks again and good luck to ya.........
Mark
Mark
Mark, ASE Certified Technician
Category: Pontiac
Satisfied Customers: 847
Experience: 34+ yrs Dealership Exp. - Fully State & ASE Certified - GM Master & GM World Class Tech
Verified
Mark and 87 other Pontiac Specialists are ready to help you
Ask your own question now
Ask Mark Your Own Question
Mark
Mark
Mark, ASE Certified Technician
Category: Pontiac
Satisfied Customers: 847
847 Satisfied Customers
Experience: 34+ yrs Dealership Exp. - Fully State & ASE Certified - GM Master & GM World Class Tech

Mark is online now

A new question is answered every 9 seconds

How JustAnswer works:

  • Ask an ExpertExperts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional AnswerVia email, text message, or notification as you wait on our site. Ask follow up questions if you need to.
  • 100% Satisfaction GuaranteeRate the answer you receive.

JustAnswer in the News:

Ask-a-doc Web sites: If you've got a quick question, you can try to get an answer from sites that say they have various specialists on hand to give quick answers... Justanswer.com.
JustAnswer.com...has seen a spike since October in legal questions from readers about layoffs, unemployment and severance.
Web sites like justanswer.com/legal
...leave nothing to chance.
Traffic on JustAnswer rose 14 percent...and had nearly 400,000 page views in 30 days...inquiries related to stress, high blood pressure, drinking and heart pain jumped 33 percent.
Tory Johnson, GMA Workplace Contributor, discusses work-from-home jobs, such as JustAnswer in which verified Experts answer people’s questions.
I will tell you that...the things you have to go through to be an Expert are quite rigorous.

What Customers are Saying:

Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help.

Mary C.Freshfield, Liverpool, UK

This expert is wonderful. They truly know what they are talking about, and they actually care about you. They really helped put my nerves at ease. Thank you so much!!!!

AlexLos Angeles, CA

Thank you for all your help. It is nice to know that this service is here for people like myself, who need answers fast and are not sure who to consult.

GPHesperia, CA

I couldn't be more satisfied! This is the site I will always come to when I need a second opinion.

JustinKernersville, NC

Just let me say that this encounter has been entirely professional and most helpful. I liked that I could ask additional questions and get answered in a very short turn around.

EstherWoodstock, NY

Thank you so much for taking your time and knowledge to support my concerns. Not only did you answer my questions, you even took it a step further with replying with more pertinent information I needed to know.

RobinElkton, Maryland

He answered my question promptly and gave me accurate, detailed information. If all of your experts are half as good, you have a great thing going here.

DianeDallas, TX

< Previous | Next >

Meet the Experts:

GM Tech (Cam)

GM Tech (Cam)

Pontiac Technician

2,379 satisfied customers

GM Grand Master Technician 2007. 14 years experience.

Dave Nova

Dave Nova

Pontiac Technician

2,014 satisfied customers

ASE Master Certification. GM World Class Certification

Gary

Gary

Pontiac Technician

1,436 satisfied customers

15 years GM master tech/15 years ASE master

Ron Z.

Ron Z.

- Pontiac Tech -

761 satisfied customers

18+yrs experience. State Inspector and Pontiac Diagnostics

Don - Mo Lurch

Don - Mo Lurch

Pontiac Mechanic

551 satisfied customers

GM, Chevrolet Cert., Heavy Line Mech, Race Shop Owner, Mobile Electronics.

John

John

GM FACTORY CERTIFIED TECHNICIAN

514 satisfied customers

ASE A1-A8 w/L1 GM master technician.Factory certified/40 years experience

car tech

car tech

ASE Certified Technician

446 satisfied customers

25 years master tech and shop owner

< Previous | Next >

Related Pontiac Questions
It,s turning over but won,t start.It was driving fine and I
It,s turning over but won,t start.It was driving fine and I parked for about two hours when I WENT TO LEVE IT TURNS OVER FINE BUT WON,T START. … read more
tim37857
tim37857
Mechanic
High School or GED
71 satisfied customers
Ecm and injectors are not communicating with each other.
ecm and injectors are not communicating with each other. injectors replaced and 2 reman. ecm's installed and no starting. motor does turn over … read more
roy
roy
Associate Degree
3 satisfied customers
I cannot open my trunk to put the top down. My battery in my
I cannot open my trunk to put the top down. My battery in my key must be dead. I am sure there must be another way to open the trunk. Cannot find one inside the car. … read more
Todd Audette
Todd Audette
Automotive Technician
Vocational High School
134 satisfied customers
How can I check the left front door latch actuator on my
Second opinion] How can I check the left front door latch actuator on my 2008 Pontiac G6 fd sedan before I re- install it? … read more
GM Tech (Cam)
GM Tech (Cam)
Pontiac Technician
Vocational, Technical or Trade Scho
2,379 satisfied customers
How can I check the left front door latch actuator on my
How can I check the left front door latch actuator on my 2008 Pontiac G6 fd sedan before I re- install it? … read more
Chad Farhat
Chad Farhat
Owner
Associate Degree
4,403 satisfied customers
Low beam lights do not work but high beam does running
low beam lights do not work but high beam does running lights work … read more
Thomas Ragusa
Thomas Ragusa
Network Systems Administration
152 satisfied customers
My car is saying that there is a door ajar. This just
My done light will sometimes go off. Sometimes it will start to go off then come back on… read more
Todd M
Todd M
Owner
ASE Certification
1,479 satisfied customers
I parked the car and turned everything that I could off, but
I parked the car and turned everything that I could off, but the parking lights are still on and there doesn't seem to be anything I can do to get them to turn off. … read more
Todd Audette
Todd Audette
Automotive Technician
Vocational High School
134 satisfied customers
2007 Pontiac torrent 3.4L codes: P0404, EGR position
2007 Pontiac torrent 3.4L codes: P0404, EGR position performance P1779, torque delivered signal common cause for these codes? Vehicle has a new OEM EGR… read more
fordguy4u
fordguy4u
Automotive Tech
Vocational, Technical or Trade Scho
70 satisfied customers
I bought factory replacement speakers for a 99 Pontiac Grand
I bought factory replacement speakers for a 99 Pontiac Grand AM GT. The factory speakers had two connectors but the new speakers have one. How can I get the factory am to kick in if it's not connected… read more
Don - Mo Lurch
Don - Mo Lurch
Pontiac Mechanic
Vocational, Technical or Trade Scho
551 satisfied customers
97 firebird no power to the instrument cluster and will not
97 firebird no power to the instrument cluster and will not start. checked the battery and unhooked it. … read more
Chris (aka - Moose)
Chris (aka - Moose)
Vocational, Technical or Trade Scho
108 satisfied customers
No heat. And yes. 2006 Pontiac grand p. Chances thermostat,
keep getting air in system , also have bad lower intake… read more
Chris (aka - Moose)
Chris (aka - Moose)
Vocational, Technical or Trade Scho
108 satisfied customers
Have a crank sensor gone bad but there are two crank sensors
Have a crank sensor gone bad but there are two crank sensors apparently but when it comes up on computer it says crank sensor a but no one seems to know which one a is … read more
Joecamel90
Joecamel90
Technician
Associate Degree
24 satisfied customers
I have an 05 Pontiac Vibe base model 5 speed manual
I have an 05 Pontiac Vibe base model 5 speed manual transmission I replaced the clutch pedal sensor twice car still won't start any ideas … read more
Peter Bagley
Peter Bagley
master technition
Vocational, Technical or Trade School
1,010 satisfied customers
Rough idle at 200 degrees running temp, wants to stall.
Rough idle at 200 degrees running temp, wants to stall … read more
Mechanic01
Mechanic01
1,659 satisfied customers
I have a 2000 Grand am gt and I'm having it throw some
Hi I have a 2000 Grand am gt and I'm having it throw some lights on the dash ONLY when I turn the fan on on the climate control. No codes appear when I scan the vehicle tho. … read more
Pete
Pete
Mechanic
Construction, Plant Fitter
57 satisfied customers
I have a 2001 Grand am that won't start. They are good. I
Yes, I have replaced the spark plugs they were wet. It started fine in the morning but would not start in the afternoon. … read more
David Craig
David Craig
OWNER/MECHANIC
Associates
4,388 satisfied customers
Not start. I have change my 2 fronts stwoke and now in dash
I have change my 2 fronts stwoke and now in dash i have no engine ligth and is whittin direct assit … read more
Pete
Pete
Independent Auto Technician
Vocational, Technical or Trade Scho
138 satisfied customers
Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Show MoreShow Less

Ask Your Question

x