Question about 1997 Buick Century

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Missfiring on cylinder #2 all new plugs wires crank sensor cam sensor motor compression good fuel pressure good no vacume leaks and leak down test good

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  • Anonymous Mar 20, 2014

    theres missfire but theres no codes i chcecked the plugs wires checked if there was a vacume leak not sure wats going on

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  • 76 Answers

Prolly a fuel injector on that cylinder.

Posted on Apr 22, 2010

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2 Answers

I have a 2011 cruze 1.6,i have a missfire,have changed the plugs to no avail still missfireing,any help would be appresiated thanks


bad injector--bad coil --if misfire is not a constant cylinder than fuel pressure cam sensor/crank sensor and such

Jun 20, 2016 | Cars & Trucks

1 Answer

What are the probable causes of DTC P0300 on this unidentified vehicle?


plugs, wires, coils, low compression, bad pcm, improper fuel pressure, bad fuel, worn out cam, plugged injector, plugged cat, bad O2 sensor, bad MAF, and Vacuum leaks can cause multiple cylinder missfires along with many other things

Aug 15, 2015 | Cars & Trucks

4 Answers

I have a 1996 chevy Corsica with a code PO300.I have tried many repairs and still cannot repair this code


code p0300 refers to random/multiple cylinder/s ---misfire detected=== causes spark plug/s--HT lead/s--injector/s---ignition coil/s--low compression --wiring
Seeing as you have covered all the electrics, now concentrate on the injectors and fuel pressures
If you will do all injectors and the fuel pressure is where it is supposed to be ( pressure test) then you will have covered all bases
Low compression will be in the one cylinder only ans will remain in that cylinder regardless of injector or plug changes
I would leave that to the last resort as if it is random, it may be a loose valve seat insert that moves randomly causing a compression problem

May 24, 2015 | 1996 Chevrolet Corsica

2 Answers

Po 306 engine missfire on no 6


If all you say is correct, then smoke test the intake
& you should have a vacuum leak next to #6

Next do a cylinder leak down, verse a compression test

Always do leak down,don't care about compression until
you fail the leak down

Feb 08, 2013 | 2001 Ford Ranger Regular Cab

2 Answers

P0304, p0305, and p0306 on 02 Mustang 3.8l.


The page LINK here is the best i have read on misfire diagnosis, it is protected so I can't copy it but you can go to the link.

Jun 29, 2012 | 2002 Ford Mustang

1 Answer

Why do my car missfire


All possible causes
1. Wiring
2. Bad plugs/Coils/wires
3. clogged/leaky fuel injectors
4. Rich/Lean fuel mixture
5. Poor fuel pressure from fuel pump
6. Weak cylinder compression
7. Vaccum leak(s)
8. Faulty sensors (MAF, IATS, ISCA/M, O2 sensor(s), etc.)
9. Contaminated Fuel (gas)
10. Leaking intake/exhaust valves
11. Stuck intake/exhaust valves
12. Out of Time (valve timing)
13. Defective Engine Control Unit (ECU)
14. Blown Head Gasket
15. and the list goes on and on and on

Jun 30, 2011 | Hyundai Elantra Cars & Trucks

1 Answer

I have a 2000 gmc sierra 5.3 with a number 6 cylinder missfire. things i have done so far: 1. compression test on number 6 tested fine,as well as the rest of the cylinders 2. leak down test. Held...


I would check the valves for number 6. If one or both are burned, stuck or out of adjustment it would cause your problem. If a cam lobe for that cylinder is burned or badly worn it could be the culprit.

Jan 10, 2010 | 2000 GMC New Sierra 1500

2 Answers

I have Low compression in Cylinder 6 and a missfire code. I'm pretty sure it's not rings, how can I test to see if its valves. And is it a common problem with S10 4.3 vortec motors?


Leak down tester, swap the spark plug for the tester, have the motor set where both valves are closed, that means taking off the valve cover, inject the air and watch the gauge.
If it leaks quickly then suspect valves, squirt in a bit of oil and try again, if no change you have a suspect. If you have good compression on the other cylinders then I would agree on the rings.

Aug 27, 2009 | 1996 Chevrolet S-10 Pickup

1 Answer

Have a 2003 Taurus, 3.0 engine that has a misfire on #2 cylinder. Replaced all spark plugs, wires, coil, replaced the fuel injectors, crank sensor, cam sensor, still have a misfire on #2 cylinder. It has...


Sound like an air / vacuum leak to me.
Re-check for an air leak on #2 cylinder inlet manifold.
Use a propane torch (unlit, of course) to flood propane gas around inlet manifold/head flange & gasket area.
If there is any change in idle speed during this test you have a vacuum leak.

Aug 18, 2009 | Ford Taurus Cars & Trucks

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