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engine sputtering

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lilwood22
New User

Oct 22, 2008, 5:18 AM

Post #1 of 4 (1671 views)
post icon engine sputtering Sign In
Year:1998
Make:chevy
Model:malibu
Engine Size3.1
Mileage:165000

driving car engine light came on and started blinking. thought it was bad gas. used gas treatment. replace fuel filter, air filter and spark plugs.


way2old
Veteran / Moderator
way2old profile image

Oct 22, 2008, 5:24 AM

Post #2 of 4 (1668 views)
Re: engine sputtering Sign In
Have the trouble codes read. This will give you a place to start your diagnosis. Post back the EXACT code number and we can help you more.



Being way2old is why I need help from younger minds


autojoe
User

Oct 22, 2008, 10:08 AM

Post #3 of 4 (1661 views)
Re: engine sputtering Sign In
The code will probably be code P0300....A Misfire code.If the check engine light is flashing then there is a chance that you can damage your catalytic converter by driving vehicle.Many things can cause this....anything from plug wires,faulty ignition coils,bad maf,fuel pressure,egr or injector problems.even system grounds but not very likely.It is hard to diagnose without proper testing equipment.Could do a tuneup plugs wires.Take coil packs off and look for carbon tracking and do resistance testing.Test fuel pressure with gauge.Injectors need special tools.Could get a spark tester at local auto parts and hook to each plug wire and ground to negative battery terminal and start car and see if crisp blue spark do on all plugs.The injectors are hard to test unless remove plenum and hook a noid light to each one and start and see if injector pulses.That does not tell you in injector is bad just that the circuit going to injector is bad.would need a labscope and a tool that does injector balance testing looking for roughly around the same amount of pressure drop on all injectors.Just some thoughts.


autojoe
User

Oct 23, 2008, 10:20 AM

Post #4 of 4 (1638 views)
Re: engine sputtering Sign In
I wanted to add the sputtering may be injector related.





 
 
 






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