Question about Cars & Trucks

2 Answers

02 Monte Carlo SS 3800 SERIESII V6, no mods. - Cars & Trucks

02 Monte Carlo SS 3800 SERIESII V6, no mods. Replaced MAP, IAC, TPS, ECM, Air Filter, Ignition module. No codes! Engine wants to idle from 1500 to 2300 rpm. If I am cruising at 1800 rpm and take my foot off the gas, the engine stays at 1800 rpm and the car almost drives itself. If I mess with the intake before the throttle body it will run right for a couple of miles then goes back to idling hi. Never seen this before. Please help

Posted by on

2 Answers

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    Superstar:

    An expert that got 20 achievements.

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

  • Cars & Trucks Master
  • 5,495 Answers

Try this. Get a spray bottle of water and mist the area with the engine running. If the RPM changes or it stalls, you have a Vacuum leak in that area.

I am not sure what you are touching to temporarily solve your problem. You may have a bad throttle position sensor or a part called an idle speed control solenoid.

Now some makers use split level intake manifolds which have 2 chambers. They are switched by Vacuum or Electric solenoids.

It sounds like you are getting extra air into the engine, which is the same thing as opening the throttle. Spray the water around Vacuum solenoids with the engine running, if one is cracked , it may draw air. Check your EGR valve for venting.

I hope my solution helps you.

Posted on Oct 25, 2012

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

    President:

    An expert whose answer got voted for 500 times.

  • Cars & Trucks Master
  • 2,620 Answers

Sounds like a faulty mass air flow sensor.Try spraying the small thin wires with a nono-chlronated brake cleaner then let it dry for 10-15 minutes then re-install.Make sure to reset the computer whether you clean it or replace it with a new one.

Posted on Oct 25, 2012

6 Suggested Answers

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
goodluck!

Posted on Jan 02, 2017

  • 321 Answers

SOURCE: buick lesabre nightmare

Need to get a scan tool and look at the data stream while it is running for alot more info.Also any trouble codes.Sounds like initially,the engine isn't getting any fuel.I would have a pressure gauge connected to the fuel rail on the engine,so i could monitor the fuel pressure while all this is going on.Items to look at on the data stream would be timing,what timing is the PCM commanding for the engine.Also,have you checked for continuos power feed to the coils during this no start condition,and fire at the plugs while cranking.You could possibly still have spark,but maybe it is extremely weak?I have seen bad ignition switches cause weird problems before too.Many things power up through the ignition switch,just a thought.Have also seen bad PCM's cause strange problems..38 volts is a little on the low side for GM.Usually see those at,at least .50 and up,and rise steadily while pressing the throttle,up to just under 5.0 volts.Potentiometer with 5 volt supply.Vacuum leak can be checked with engine running at a steady idle speed,spray brake cleaner all around the intake manifold and listen for engine speed change.

Posted on Jul 31, 2008

cbaroni78
  • 44 Answers

SOURCE: high idle 1997 Madza 626 4 cylinder auto transamission

The PCM controls idle speed to ensure good driveability. The PCM will only attempt to maintain the desired idle speed when it “knows” the throttle is closed. A throttle switch or the TPS input is used to determine when the throttle is in the idle position. Motors and solenoids are used by most PCM’s to control idle speed. Many PCM’s are programmed to attempt to control the idle speed by adjusting spark timing and then by controlling the idle speed actuator. Some computers of the early 80's did not control idle speed.

Posted on Oct 19, 2008

mkv0525
  • 358 Answers

SOURCE: High rpm (fast idle)

it is normal. car is designed to do this when engine is cold. it called open loop. when it warms up it is called closed loop.

Posted on May 21, 2009

  • 412 Answers

SOURCE: 1998 ram 1500 5.9 gas rough idle,hissing sound from air filter

SHOWING MISFIRES ON SCAN TOOL?IF NOT,ENGINE CONTROLLER HAS NOT LEARNED MISFIRE MONITOR..WILL HAVE TO BE DRIVEN A BIT FOR RELEARN..IF YOU CAN SEE MISFIRES..MISFIRING ON MORE THAN 1 OR ALL CYLINDERS?CHECK UNDERSIDE OF IGNITION COIL FOR CRACKS..IF NOT CRACKED,YOU MAY HAVE A FAULTY CRANK SENSOR..ANY CORRODED PLUG WIRES AT DISTRIBUTOR CAP?ALSO CHECK IF ANY OIL PRESENT IN INTAKE MANIFOLD..GASKET ON BOTTOM OF INTAKE MAY BE BROKEN CAUSING AN INTERNAL VACUUM LEAK

Posted on Jun 22, 2009

  • 1 Answer

SOURCE: 1999 vw cabrio engine cuts out

I had the exact problem with my wifes 99 Cabrio - parked for 9 months. Ended up having to have the shop reprogram the ECU - it then worked fine.

Posted on Aug 20, 2009

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

Where is the fuel pump restart switch on a chevy


How can you tell if you're timing chain need to be replaced?? On my 2002 Monte just keep turning

Sep 17, 2014 | 2002 Chevrolet Monte Carlo

1 Answer

Car won't idle


First if the "service engine" light is on I would have a local retailer or garage see what the codes are. For possible TPS, IAC, or mass air flow problems. TPS being "throttle position sensor" IAC being "idle air control" If a light is not currently present, listen under the hood for a hissing noise or signs of a vaccum leak.

Feb 13, 2014 | 2005 Chevrolet Monte Carlo

1 Answer

2001 Monte Carlo SS cranks but won't start


run the fault codes again and fix all of what is suggested in the causes.

Jan 10, 2014 | 2001 Chevrolet Monte Carlo

1 Answer

Where is the oil pressure switch located on a 202 monte carlo ss 3800


It is just above the oil filter. it is easy to see if you pull off the right front tire

Oct 31, 2012 | Cars & Trucks

2 Answers

My monte carlo has code p0507 what is it and how can i fix it


possible causes
- Dirty throttle body
- Electric throttle control actuator misadjusted or damaged
- Faulty Electric throttle control actuator
- Intake air leak
- Poor electrical connection to the Intake Air Control (IAC) valve
solution !!!
If there are no intake leaks, clean throttle body, adjust engine idle and erase engine code. If the code comes back you may have to replaced the Electric Throttle Control Actuator (Motor) to repair the problem.

Jan 28, 2011 | 2000 Chevrolet Monte Carlo

2 Answers

1995 chevy 4.3 idling at 2300 rpms


1995 S-10 Chevy Blazer just replaced fuel pump now it is idles at 1500 RPM's what should I do.

May 29, 2009 | 1995 Chevrolet S-10 CA Edition

1 Answer

2003 Monte Carlo SS Hesitates and Dies after running for awhile


The ck engine light should not be ignored, what sensor was shown to be bad ? Have it scanned again and replace the sensor that is bad if it still runs rough you might want to consider a tune up. Plugs, wires, fuel and air filter's and clean the throttle body with some gumout. It could also be the IAC motor Idle Air Control. Good Luck

May 10, 2009 | 2003 Chevrolet Monte Carlo

2 Answers

2002 Monte Carlo SS starting when it wants


The Starter silenoid is probably what the problem is. And the knocking could that be a loose starter? The two problems doesn't seem connected.
God Bless Greg

Nov 21, 2008 | 2002 Chevrolet Monte Carlo

Not finding what you are looking for?
Cars & Trucks Logo

Related Topics:

136 people viewed this question

Ask a Question

Usually answered in minutes!

Top Cars & Trucks Experts

yadayada
yadayada

Level 3 Expert

75744 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22114 Answers

Randy Ohler

Level 3 Expert

14585 Answers

Are you a Car and Truck Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...