Question about 2001 Chevrolet Astro

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Can not clear a 303 code HELP!!!!

I have done all this and still have the 303 code flashing light when you step on gas. P0303 is cylinder #3 misfire detected. Start by changing the spark plug. If that doesn't clear it then try changing the plug wire. If that doesn't clear it, then you might need to look at the injector.

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After you make a repair you need to clear the computer codes. Try taking the pos cable off the battery for 5 or 10 minutes, then put it back on, DO NOT let the pos. cable touch anything on the car, wrap a thick rag around it.

Posted on Nov 10, 2013


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Posted on Jan 02, 2017

tragedy lok
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SOURCE: misfire of the #3 cylinder, 4.3 6 cyl


Posted on Aug 18, 2009

  • 95 Answers

SOURCE: Check engine light on. I

Chek that the car computer is working properly .Seek for a professional electrical-mechanic that can check an diagnose your car computer. Sammyc47

Posted on Feb 21, 2011


What money?

Who is working on it,a repair shop?

Plugs don't fix a misfire
A bad coil would,if you got the correct one.

There are no computers used for any automotive
diagnostic work what so ever,unless you run scan
tool software on your notebook

Need to continue to look at all data related to
whatever problem you now have,since changing
plugs & coil

No check lights on dash, doesn't mean they aren't
stored in data

You could have worn out O2 Sensors,Bad TPS Sensor,
Vacuum Leaks & Evap Issues,& any number of things

Look at fuel trim,timing,smoke test intake & evap

Posted on Aug 23, 2011

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Car shakes during idle

Those are misfire codes 300 is multiple misfires, 301 is same but is cylinder 1, 303 is cylinder 3. This could be injectors or coil packs.

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Po 303 304 code 97 honda civic

You have done everything except touch on what is wrong . code p0303 refers to cylinder 3 misfire detected===causes ---engine mechanical fault---wiring---ignition/ furl system---injector---RCT/MAF sensor--ECM
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have a compression test done as there are two adjacent cylinders and it may be a head gasket problem

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Error code po 303 316 354 355 356

P0303 Cylinder 3 Misfire Detected
P0316 Engine Misfire Detected on Startup (First 1000 Revolutions)
P0354 Ignition Coil "D" Primary/Secondary Circuit
P0355 P0356 Ignition Coil "F" Primary/Secondary Circuit
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Multi-Diag Access J2534

Apr 15, 2013 | 2005 Ford Escape

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303 misfire code

Trouble Code: P0303

Cylinder 3 Misfire Detected

Possible Causes:

Air leak in the intake manifold, or in the EGR or PCV system.Base engine mechanical fault that affects only one cylinder.Fuel delivery component fault that affects only one cylinder (i.e., a contaminated, dirty or sticking fuel injector).Ignition system problem (coil or plug) that affects one cylinder.TSB 00-06-04-024 contains a repair procedure for this code.Here's what is listed for this code.303 means it's cylinder 3 that has a problem.To check injector,may be dirty,is to trade it out with another cylinder and see if the problem has left cylinder number 3 and it's at where the injector went.Was the spark that you replaced oily or clean.Could be a mechanical problem,bad piston ring,usually a oily plug in this case.Check for leaks by number 3.

Dec 31, 2012 | 2001 Chevrolet Astro

1 Answer

What are codes 302 303 misfire that come up and how do i fix it

the codes are p0302 and p0303 p0302 if a misfire in cylinder number 2 p0303 is a misfire in cylinder number 3

Mar 30, 2012 | 1997 Honda Accord

1 Answer

Hi I have a 2005 ford freestar have replaced plugs & wires still running rough code 303.

The code should be P0303..cylinder #3 misfire detected. If you have replaced the plugs and wires and the misfire is still there, then the next thing to look at would be the injector for that cylinder. Since your car has a common coil for all six cylinders, I doubt that is the problem. You can also swap two of the plug wires to rule out a bad spark plug wire. Same goes for the plug. If you swap anything just do one thing at a time. If the misfire moves then you can isolate the bad part. Be sure to clear the code each time, before testing.

Jun 26, 2011 | 2005 Ford Freestar

1 Answer

I would like to know what does this codes means 300 302 303 304 305 and what to do to fix it. I have change the sparks and cables, the coils and the Orings of the ingectors. please help me

P0300 random/ multiple misfire detected
P0302 misfire cylinder #2
P0303 Misfire cylinder #3
P0304 Misfire cylinder #4
P0405 Misfire Cylinder #5

This is pretty common thing, and if you have already changed out the wires, coils, and and plugs then you maybe having trouble with the ECU. The good news is that there are local shops (not as expensive as dealerships) that can either flash or replace your ECU. If you don't have a local shop in your area that does this kind of work, then you will be stuck with the dealership.

Good luck,

Jun 02, 2011 | Toyota Corolla Cars & Trucks

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Have misfire, code P0316, any ideals? 86,000 miles on

2004 Marauder and 2003-2004 Mustang vehicles built before 12/19/2004 equipped with 4.6L 4V/5.4 4V engine may exhibit a runs rough, lacks power, and engine misfire, prompted by a MIL light and DTC codes P0301, P0302, P0303, P0304, P0305, P0306, P0307, P0308, and P0316.
Diagnose engine for engine misfire concern. If diagnostics determine an engine misfire which is characterized by leakage through exhaust valve(s), only replace the affected cylinder head(s).
1. Perform relative compression check on all cylinders. If abnormal, check cylinder leakage and actual compression for "low" cylinders refer to Workshop Manual (WSM), Section 303-00.
2. If leakage/compression check indicates a valve train concern, per valve train diagnostics in WSM, Section 303-00, replace cylinder head and cam assembly, pipe plugs and timing chain tensioner, per procedure outlined in WSM, Section 303-01.
3. If cylinder leakage and compression tests are inconclusive, perform misfire diagnostic, per TSB 05-22-8.


Feb 26, 2011 | 2004 Ford Freestar

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440 and 441 relate to the evaporative prurge flow system and 303 is a misfire detectec in cylinder 3.

May 07, 2009 | 2004 Chrysler PT Cruiser

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