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Having a misfire on my 1998 chevy truck 5.7. compression is good wires, plugs, injectors all check out good. what else could it be?

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You forgot to mention whether it is a constant misfire, an on-load misfire or a light throttle misfire?

Try checking the spark power on each cylinder.
Locate the defective cylinder if you can.
Check for intake air leaks including vacuum pipes and hoses and the brake booster and egr system.

Forget about a compression test - these are rarely precise enough and only a cylinder leakage test will pin-point the smallest of valve seat defects, especially the intake...

Posted on May 09, 2017


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2004 Sorento began with code P0305, cyl #5 misfire. Inspected and replaced plugs, wires, and coil pack on cyl #2. Repair shop told me cyl #5 injector bad so they replaced. Still has misfire.I suggeste

If you had code P0305, I don't know why they would have done anything to the #2 cylinder but if they have already replaced the plugs, wires and injector; here are a few more items to check:
1) Check connections from ECM. Look for any corrosions or bent/broken pins.
2) Check the fuel line pressure
3) Check the engine compression
4) And if the above are good, then you will probably have a defective ECM

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could be the fuel injector if it is stuck open or shorted to ground. check the compression first on that cylinder. if the compression is good check the fuel pressure bleed off time. if the pressure drops more than 20psi in 15 minutes it very well could be a faulty injector.

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Hello I have a 1999 Chevy Blazer with a 4.3L I keep getting the code Multiple misfire or misfire cyl 5. I have replaced the crank sensor, cam sensor, ignition module, map sensor, injectors, fuel filter,...

Make sure plugs are gapped correctly and coil pack is good . If can't feel it missing could be a false code generated by computer . Hope this helps

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I have a 1998 D1500 318 V-8 3.2L . The computer keeps tripping the check engine light and coding cylinder 4 misfire--yet the plug is good and the distributor cap is not problem??

Hi, there are 2 common reasons for a single cylinder misfire you have not addressed it: faulty fuel injector and burnt valve.
You need a voltmeter to test the injector:
Check the resistance across the injector terminals. It should be about 12 ohms. If open or shorted, replace the injector.
After removing an injector, apply 12 volts DC across the terminals. A "click" should be heard. If not, replace the injector.
If ok, then you need to do an engine compression leakdown test with cylinder compression gauge. if compression leaks down in that cylinder, then you have a burnt valve causing the misfire

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Have a misfire on cylinder 3

Here is what to check let me know if you need help checking this out
most common misfire causes on the cars I've worked on have been:
  1. Spark plugs
  2. Spark plug wires
  3. Ignition coil
  4. Fuel injector
  5. Wiring to fuel injector
  6. Timing Belt
  7. Vacuum leak or stuck open EGR
  8. Contaminated fuel or bad fuel pump
  9. Weak compression
  10. Blown head gasket

Jul 14, 2010 | 1998 Dodge Durango

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1998 oldsmobile Intrigue #3 misfire

I would check compression as well A low compression will also cause a misfire.I have seen where a valve was closing perfect for a couple of days then not so good for a couple of days and so on . so do cyl leakage test. and good luck

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1998 buick century cylinder 5 misfire

it sounds like you have low compression on cyl 5 might be bent valve.

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Code p306 misfire on injector 6

Random misfires are usually caused by a leaking vaccum pipe, and will only be apparent at idle and sometimes at low engine speeds under part throttle.
Isolated misfires are usually caused by a faulty injector, coil pack, ignition lead, or low compression.

Well, you're going to have to check the spark plug,  spark plug wire, the coil pack, low compression, and the ignition lead, which only really leaves the injector, or even an intake leak at the offending cylinder. 

Start the engine and then spray intake spray or the like around the intake at the offending cylinder and see if the engine note changes. If it does, then you have an intake leak, otherwise, they need to check the injector in the offending cylinder. 

Good luck and hope this helps. It might just be time for a tune up: new spark plugs and wire or some fuel injector cleaner every fill up for now.

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