Question about Chevrolet Corvette

2 Answers

I have 1999 c5 corvtte the problem is when engine is idling and up to 2500 rpm theres a small missfire the engine just jolts ever 5 seconds. there are on noboard fault codes.i have a diablo turner and it it show sensor faults which condict each other (like bank1 senser1 low input then the next one say the opposit and sono you end up with so many senser faults if they were true it wouldnt run ) it starts and driver perfect exsept it is using more fuel .i did have a faulty ht leads .its had new ht lead and plugs.that did make it run better. it said temp sensor and oxeygen senser faulty i replaced them and it still reads faulty.i have unplug ecu,s and clean contacts with switch cleaner spray .in seems like the ucu is miss read all enging sensers and altering the fueling lean and rich that making it idle fault .ps i have cleaned all the earths ect i have no idea how to cure it regard derek uk

Posted by on

  • pamdella May 08, 2009

    your answer is of no use i need more hands on information please

×

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.

  • Master
  • 3,267 Answers

Since you have observed that most of the sensors are not showing proper signal and you have also you have recently changed the ht head & the leads. Well this also plays a major role for the sensors to read, analyze and make necessary adjustments to almost everything to do with the engine to run smoothly. Its related to the timing control of combustion too. A major change requires a calibration of the entire sensor and control functions which can only be done at the service center computer which will then reset all the sensors so that proper fuel-air mixture is optimum thus eliminating the misfiring and the fuel consumption. Once the sensors have been calibrated with the computer, all readings should then be accurate which will correct both your problems................sodeep

Posted on May 08, 2009

  • 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.

    Vice President:

    An expert whose answer got voted for 100 times.

  • Master
  • 413 Answers

Having car trouble that you can't figure out? Or need some guidance to make a repair? If you have access to the Web, you can get help any time, any day--from POPULAR MECHANICS and the companies that make the parts and tools you're using.

It's easy to search the Web if you know where to look. Although new Web sites go up every day, the major companies have had them for a long time--and keep upgrading them. And if you go to periodically updated lists of manufacturers and their Web sites, you can pick up the new ones.

The PM.Zone is a great place to look first. If you check the Automotive area, you'll be able to select from a broad choice of Saturday Mechanic features that have appeared in the last four years. So if you remember that not long ago we ran an article on the problem you have now, check the list and pull up the fully illustrated article.

Want basic how-to information? Point your browser to http://www.autosite.com to find Owning Your Car and, under it, a choice of repairs and maintenance, or reference materials. Both have details on doing a broad range of jobs, but are very short on the illustrations that appear in a typical Saturday Mechanic.

Factory Service Bulletins
Is there a factory problem involved, and perhaps a bulletin that provides the fix? To find out, go to http://www.alldata.com/, the URL for a leading automotive service information provider for professional mechanics. The consumer information section leads you to TSBs (technical service bulletins), and if you plug in the year, make and model of your car, the Web site provides you with a list of bulletins by number and issue date, with a one-sentence description. In some cases the description isn't much, but in others it could be a good lead, such as "Intermittent pull under hard braking--vehicles with ABS" (antilock brakes). If that's your problem, it's worth finding out if the factory fix applies by checking the bulletin. There are many ways to get factory bulletins, including the Popular Mechanics CD-ROM for your car.

Less comprehensive sources of factory bulletins, but with specific detail on those bulletins covered, are at Web sites of two trade associations: the Automotive Parts Rebuilders Association (http://www.apra.org/) and the Automotive Engine Rebuilders Association (http://www.aera.org/).

Do You Want To Ask A Mechanic?
Ask a mechanic via a note or e-mail. CompuServe has a forum in its automobile area called What Ails It? Post your question and you're likely to get answers from friendly professional mechanics all over the country. The Auto Channel (http://www.theautochannel.com). has a Repair & Maintenance icon that leads you to Ask The Experts, lists of frequently asked questions (FAQs) and the opportunity to e-mail your query to Pete the Mechanic. The C.A.R. Show Site (http://www.thecarshow.com) is the site of a radio program that provides on-the-air automotive diagnosis for listeners. If you don't get the program in your area, the site has an e-mailbox (carshow@toledolink.com) that will get you an answer.

Check The Appropriate Web Sites
Go to a manufacturer's Web site to learn about its parts, tools or equipment. You may find that there's an e-mail address for technical questions, or a hotline phone number. In most cases, there's also useful tech service information right at the site. Examples:

• Cooper Automotive's many brands include Moog suspension parts, Precision universal joints and Wagner brakes. Its Web site (http://www.moogauto.com) provides Tech Tips for each brand. You'll find a lot of answers to common service problems in the area covered by the brand's parts.

• A.E. Clevite, a manufacturer of engine bearings, offers several services at its site (http://www.engineparts.com). It has an area called Motorhead Heaven, which leads you to Paging Dr. Dipstick for answers to FAQs, and an e-mail address for special problems. The Tech Stuff section has a lot of information on engine overhaul work, including profusely illustrated instructions for installing engine bearings.

• Turn to http://www.bwdautomotive.com/ for the conglomerate that includes Borg Warner transmissions and Niehoff ignition. Under Things You Should Know, in the We Can Help area, you'll find Tech Tips by make and year of car.

• The maker of SunPro diagnostic equipment for Saturday mechanics has tips on using testers (http://www.actron.com). It also has a demonstration program of a scan tester that you can download, so you can do a "virtual tryout" of the tool before you buy one.

• Doing high-performance upgrades to your car? If you're considering or using Edelbrock parts, the company's Web site (http://www.edelbrock.com). has lots of tech help, even a detailed report on setting up its Performer series of carburetors.

An excellent list of Web sites (with links) for automotive aftermarket parts, tools and equipment companies is maintained by Automotive Week, a weekly newsletter for people who work in the industry. At its Web site, http://www.auto-week.com, go to Hot Links to get the list to make up for other additions.

Do A Web Search
Even if you haven't got a clue, do a Web search. You might be pleasantly surprised. It's often worthwhile to start with the automotive section of any search engine and look for any specifics in which you may be interested. Searches by makes and specific models of cars often lead you to enthusiast clubs, handy if you're trying to restore an oldie. The more focused your search, the more likely it is to yield good information, of course. But we took a relatively broad term, "rack and pinion steering," and one search engine produced a couple of good, basic illustrated technical articles on this and other types of steering, one from AC Delco, another from a road emergency service. You never know. But there's a lot of information you can get on the Web if you learn how to click and look.

Posted on May 08, 2009

1 Suggested Answer

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

Add Your Answer

Uploading: 0%

my-video-file.mp4

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

×

Loading...
Loading...

Related Questions:

1 Answer

Engine idles up to 2500 and after 5 or 7 seconds, goes back down to 1200 rpm 2002 escort SOHC


Clean out the throttle body carefully and replace the auxilliary air idle valve. There is a resetting process for this valve so dont just fit and hope!
Check on Google or forums but i think ...when fitted you turn on ignition but dont start car , then put the accelerator pedal slowly to fully open, hold it for a min then release. start and drive car until warm and the recheck.
If the idle is high then settles it is not an air leak. It is something stuck that then releases which is only throttle flap or idle valve. It is always a goid idea to replace fuel, oil, air filters on normal service intervals.
Roger

Apr 22, 2014 | 2002 Ford Escort

1 Answer

Have a '99 silverado that will not idle


I would check the idle air control valve that is the what controls rpms

Apr 15, 2013 | 1999 Chevrolet Silverado 1500

1 Answer

'99 silverado 5.3 engin will not idle runs at 2500 rpm and drops down to 1000 rpm the back up to 2500 rpm -------------------------


which car is it?

problem with 1993 Geo Prizm '99 silverado 5.3 engin will not idle runs at 2500 rpm and drops down to 1000 rpm the back up to 2500 rpm -------------------------

Apr 15, 2013 | 1993 Geo Prizm

1 Answer

I have a 2008 mercury Milan with nearly 60k miles on it. When I come to a stop the rpm drops by 1000 then recovers quickly. What should I do to fix the problem? Any suggestions will be greatly appreciated.


Check out related help links to troubleshoot these problem:----Click the link below:---Idles Fine but RPM jumps in drive mode? http://technoanswers.blogspot.in/2012/07/idles-fine-but-rpm-jumps-in-drive-mode.html
---------Mitsubishi Lancer rpm needle bounces? http://technoanswers.blogspot.in/2012/02/mitsubishi-lancer-rpm-needle-bounces.html
--------How to adjust rpm on 2009 dodge charger SRT8?


http://schematicsdiagram.blogspot.com/2011/12/how-to-adjust-rpm-on-2009-dodge-charger.html
---------
Engine cuts out at 3000 RPM? http://schematicsdiagram.blogspot.com/2011/12/engine-cuts-out-at-3000-rpm.html

---------

Cold start problem and vehicle shudder around 2500 to 3500 rpms
http://repairhelpcenter.blogspot.com/2012/10/cold-start-problem-and-vehicle-shudder.html

---------
High rpm in neutral? Inconsistant high RPM in neutral? http://technoanswers.blogspot.in/2012/02/high-rpm-in-neutral-inconsistant-high.html

-----------
Jetski Sputters and Low RPM? http://whatisbyme.blogspot.in/2012/07/jetski-sputters-and-low-rpm.html

--------
Fuel Injection Problem And RPM suddenly increases http://whatisbyme.blogspot.in/2012/07/fuel-injection-problem-and-rpm-suddenly.html

----------
2005 Toyota Highlander: Engine runs hard RPM below 3000? http://whatisbyme.blogspot.in/2012/05/2005-toyota-highlander-engine-runs-hard.html

---------
1987 Toyota Camry: RPM Drops going Up hills? http://whatisbyme.blogspot.in/2012/05/1987-toyota-camry-rpm-drops-going-up.html

-----------
Cruise Control stops working, Excessive cranks to start the engine and RPM goes max 2500 http://whoisbyme.blogspot.in/2012/07/cruise-control-stops-workingexcessive.html

----------
1990 Toyota 4Runner: Engine cuts off when reaches 2000 RPM?


http://whatisbyme.blogspot.in/2012/05/1990-toyota-4runner-engine-cuts-off.html

------------
1999 Toyota Camry: Erratic stalling and high engine RPM at idle?


http://whatisbyme.blogspot.in/2012/05/1999-toyota-camry-erratic-stalling-and.html

---------
1995 Toyota LS: Misfire at idle or low RPM http://whatisbyme.blogspot.in/2012/04/1995-toyota-ls-misfire-at-idle-or-low.html

-----------
Lexus RX: Tapping noise under Valve Cover At Low RPM? http://technoanswers.blogspot.in/2012/04/lexus-rx-tapping-noise-under-valve.html

----------
These will help.
Thanks.

Nov 22, 2012 | Cars & Trucks

1 Answer

Driving on the road the RPM goes higher wituout speedind


Check out related help links to troubleshoot these problem:----Click the link below:---Idles Fine but RPM jumps in drive mode?http://technoanswers.blogspot.in/2012/07/idles-fine-but-rpm-jumps-in-drive-mode.html
---------Mitsubishi Lancer rpm needle bounces?http://technoanswers.blogspot.in/2012/02/mitsubishi-lancer-rpm-needle-bounces.html
--------How to adjust rpm on 2009 dodge charger SRT8?


http://schematicsdiagram.blogspot.com/2011/12/how-to-adjust-rpm-on-2009-dodge-charger.html
---------
Engine cuts out at 3000 RPM?http://schematicsdiagram.blogspot.com/2011/12/engine-cuts-out-at-3000-rpm.html

---------

Cold start problem and vehicle shudder around 2500 to 3500 rpms
http://repairhelpcenter.blogspot.com/2012/10/cold-start-problem-and-vehicle-shudder.html

---------
High rpm in neutral? Inconsistant high RPM in neutral?http://technoanswers.blogspot.in/2012/02/high-rpm-in-neutral-inconsistant-high.html

-----------
Jetski Sputters and Low RPM? http://whatisbyme.blogspot.in/2012/07/jetski-sputters-and-low-rpm.html

--------
Fuel Injection Problem And RPM suddenly increaseshttp://whatisbyme.blogspot.in/2012/07/fuel-injection-problem-and-rpm-suddenly.html

----------
2005 Toyota Highlander: Engine runs hard RPM below 3000?http://whatisbyme.blogspot.in/2012/05/2005-toyota-highlander-engine-runs-hard.html

---------
1987 Toyota Camry: RPM Drops going Up hills?http://whatisbyme.blogspot.in/2012/05/1987-toyota-camry-rpm-drops-going-up.html

-----------
Cruise Control stops working, Excessive cranks to start the engine and RPM goes max 2500 http://whoisbyme.blogspot.in/2012/07/cruise-control-stops-workingexcessive.html

----------
1990 Toyota 4Runner: Engine cuts off when reaches 2000 RPM?


http://whatisbyme.blogspot.in/2012/05/1990-toyota-4runner-engine-cuts-off.html

------------
1999 Toyota Camry: Erratic stalling and high engine RPM at idle?


http://whatisbyme.blogspot.in/2012/05/1999-toyota-camry-erratic-stalling-and.html

---------
1995 Toyota LS: Misfire at idle or low RPMhttp://whatisbyme.blogspot.in/2012/04/1995-toyota-ls-misfire-at-idle-or-low.html

-----------
Lexus RX: Tapping noise under Valve Cover At Low RPM?http://technoanswers.blogspot.in/2012/04/lexus-rx-tapping-noise-under-valve.html

----------
These will help.
Thanks.

Nov 22, 2012 | 2008 Toyota Avalon

1 Answer

BMW 523i 1999 model


your car is not suppose to idle at 500 rpm . 800 to 950 is the proper idle, unfortunately it is controlled by the computer. have you checked the idle speed control valve? also check the air flow meter

May 28, 2009 | 2001 BMW 5 Series

1 Answer

Suzuki Baleno (esteem) 1999. Engine Idle RPM not stable


you probably need to check the butterfly. its the compinent that controls how much air goes into the engine if it is weared than in idle state air leaks into the engine sometime more sometimes less and cause fluctuations in rpm

secondly there is a rpm switch which controls the rpm you can replace that switch and check

May 18, 2009 | 1999 Suzuki Esteem

1 Answer

My 1987 turbo toyota supra will only rev up to 2500 rpm then cut out like a governer. when it drops to about 2000 rpm it will rev back up only to 2500 rpm. at an idle it runs rough


The throttle position sensor has an idle switch in it that tells the car's computer that the throttle is positioned at idle. If the idle switch sticks in the idle position, the computer will not allow the engine to rev more than 2500 rpm. In your case, I think the switch is stuck.

First, see if you can get the trouble codes to come up. Rig a jumper wire and jump between the "T" terminal and the "E1" terminal in the car's "Diagnostics" box. It is a small black box on the driver's side of the engine compartment near the battery. Open the lid and on the inside of the lid it has a map of the terminals.

Once you hook up the jumper wire, turn the ignition switch to on but do not start the car. If there are codes, the check engine light (orange) will blink the 2 digit code. It blinks the first digit, pauses, then blinks the second digit. The code for the throttle position sensor is code "41". That is, four blinks...pause...then one blink. If this code comes up, change the throttle position sensor. (If there are no codes, the check engine light will steadily blink once per second until you turn the key to off.) Don't forget to remove the jumper wire when you are finished.

Apr 10, 2009 | Toyota Tundra Cars & Trucks

1 Answer

1997 chevy truck rpm slow to return to idle


check operation the throttle control motor or cable if used ( broken /missing return spring

Jul 13, 2017 | 1996 Chevrolet Blazer

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

Related Topics:

59 people viewed this question

Ask a Question

Usually answered in minutes!

Top Chevrolet Experts

yadayada
yadayada

Level 3 Expert

75066 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22095 Answers

Jeff Turcotte
Jeff Turcotte

Level 3 Expert

7754 Answers

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

Answer questions

Manuals & User Guides

Loading...