Question about 2002 Honda S2000

1 Answer

Rough idle with check engine light

Rough idle with a check engine light that keeps going on and off. compression low on one of the cylinders but that was after my valve adjusment. the difference from the other cylinders is around 40. so whats wrong with it? could it be my injectors? i also just changed my spark plugs. i have no loss in power too. the car is a honda s2000 year 07 with 80000 miles

Posted by on

  • Steeler Ed May 11, 2010

    Please post the code that the check engine light is generating.

    If you had a valve adjustment and now there's low compression in a cylinder, I'd say the valve is not seating properly. If it was an injector, you'd notice a drop in power and MPG.



1 Answer

  • Level 2:

    An expert who has achieved level 2 by getting 100 points


    An expert that gotĀ 5 achievements.


    An expert whose answer gotĀ voted for 20 times.


    An expert who has answered 20 questions.

  • Expert
  • 68 Answers

Usually a rough idle on a Honda is a result of the idle speed being too low. What is your RPM suring idle now. Try to increase it using the screw on the idle air control by only a quarter turn at a time. Hope this helps.

Posted on May 09, 2009


1 Suggested Answer

  • 2 Answers

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

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.

Posted on Jan 02, 2017


Add Your Answer

Uploading: 0%


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



Related Questions:

1 Answer

I'm showing a misfire on my van po 300 & po301 it idles rough but runs good on freeway. how do I fix this .I've relaced the ignition/spark plug coil. the check engine light still on

Well number one has a misfire, so if the fuel injector is OK and all ignition concerns are good, the cylinder may have low compression, check all the engine cylinder pressures, no cylinder should read lower than 5% of the highest PSI reading of the other cylinders.

Feb 09, 2017 | Cars & Trucks

1 Answer

What are the probable causes of recurrent DTC P0302?

Check the compression on the cylinder. Compare it to specs and to the other cylinders. If the compression is too low, it can cause misfiring. Low compression could be due to piston ring wear, cylinder wall wear, or improper valve seating.

Feb 14, 2016 | 1998 Volvo V90

2 Answers

Troubleshooting a rough idle

Have the engine computer scanned for trouble codes. Misfires are from loss of fuel, spark, or compression. Check the fuel pressure, check that all spark plugs are getting spark, and if all good so far, test engine compression. Low compression in a cylinder will cause misfires and loss of power.

It could also be a vacuum leak- a loose or cracked vacuum hose or an intake gasket leak.

Jul 27, 2014 | Dodge Stratus Cars & Trucks

1 Answer

1990 4runner

A couple of possible problems, low compression on one or more cylinders, possibly a burned valve, possible headgasket leaks, have the compression tested and checked for a headgasket leak, both of these conditions would cause a rough idle and then seem to run normally when warmed up.

Jun 20, 2014 | 1990 Toyota 4Runner

1 Answer

Will the heads have to be pulled in order to check so see if it is a valve that is causing low compression? How long can you drive on a p0303 ?

Low compression does not require head removal. Do a compression test on a cylinder, then squirt some oil in the spark plug hole. Do the compression test on that cylinder again. If the compression goes up then the rings are worn. P0303 is a misfire in cylinder 3. This lets unburnt gas into the catalytic convertor. The cat can overheat, melt and be ruined. If the check engine light is blinking don't drive the car. A misfire is either no gas, no spark or low compression. The quivering light can be from idle or failing alternator. Put the probs of a multimeter on the battery posts. Set the meter to volts dc. Start the car the voltage should be between 13 and 14.6 volts. Anything more or less points to an alternator problem.

Apr 25, 2014 | 2006 Dodge Stratus

2 Answers

Why low compression in 3rd cylinder?

If you have low compression on that cylinder you could need new rings on pistions but I am thinking maybe your problem lies in the valves. I would have the valves checked first.

Apr 24, 2014 | 2006 Dodge Stratus

1 Answer

Low compression in cylinder 1 and burning oil

If your rings are worn or the cylinder wall is gouged, pressure will escape and oil will leak into the cylinder and get burned. Keep your eye on the oil level and you should be ok for a while. If you live in a warm climate, you might try a slightly heavier weight oil.

Mar 27, 2017 | 2003 Honda Accord

1 Answer

Stopped at light. Oil light came on engine died. Restarted no power real rough. Won't idle. Is there a safety shutoff on loss of oil press. Any suggestions. 1997 3.1 lumina

Hi. This issue has several causes, but the oil light indicator is a strong sign of low pressure in the engine. This will cause the engine lubrication rate to drop, thus, producing a illuminated oil light, and erratic Oil pressure readings. The necessary actions are to have a manual oil pressure test ran on this engine, asap. When running a manual oil pressure test, you will discover if the true oil pressure is low, or normal. If the test proves that the oil pressure is, indeed, low, this will confirm that the Oil pump is suspect.

Now, if the true readings given during the manual oil pressure test are indicating that the pressure is normal, this will be the result of a failed sending unit(oil pressure switch). Although the oil pressure is suspect, this is not your only issue here. There seems to be a abnormal compression rate, present. This is causing the rough idle, and erratic RPMs. I recommend to administer a engine block compression test, as well. This test will discover if , indeed, there are issues within the cylinder heads, and block structure, such as a worn head gasket, cylinder wall issues, and cracked block. Normally, these issue will send signs, like white, or gray smoke out the tail pipe, or discolored oil. It will, also, promote erratic RPM ratings, and a rough idle. Have the oil pressure test, and engine block compression test ran, asap.

Once the test are administered, you will be able to isolate the actual problem areas, more accurately. Check the spark plug wire sets, and ignition assembly for faults, also...

Feb 20, 2011 | 1997 Chevrolet Lumina

1 Answer

2003 cartier 4.6L 120K miles. Rough idle, at idle only.

has anyone checked for a vacum leak? a vacum leak will cause rough idle at idle. check the lines from the pcv valve.

Mar 21, 2009 | 2003 Lincoln Town Car

Not finding what you are looking for?
2002 Honda S2000 Logo

534 people viewed this question

Ask a Question

Usually answered in minutes!

Top Honda Experts


Level 3 Expert

76682 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22219 Answers

Kevin Daniels

Level 3 Expert

1455 Answers

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

Answer questions

Manuals & User Guides