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i need help with my 1996 impala ss. misfire #6

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i need help with my...

i need help with my 1996 impala ss. misfire #6

Submitted: 1 year ago.Category: Chevy
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Answered in 1 minute by:
1/10/2016
Chevy Mechanic: Chris (aka-Moose), Technician replied 1 year ago
Chris (aka-Moose)
Chris (aka-Moose), Technician
Category: Chevy
Satisfied Customers: 49,097
Experience: 16 years of experience
Verified

Welcome, I'm Chris (aka Moose) I'm an independent contractor here at Just Answer.

What have you done trying to address this single cylinder misfire?

Does it misfire all the time or intermittent?

Thanks for asking your question and letting me try to help you.

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Customer reply replied 1 year ago

when engine is cold and i reset codes and start up it takes about 4-5 until check engine light starts flashing then goes steady. car idles fine.

before i got this code i just finished changing timing cover gaskets and seals. and new temp sensor between spark plug 6 & 8.

ever since i get this code.

i've replaced crank sensor optispark plugs wires.

checked for vacuum good

swapped 6 & 3 injectors

noid light on injector and spark plug good

compression 120psi.

Chevy Mechanic: Chris (aka-Moose), Technician replied 1 year ago

Can I assume you have ruled out the plugs and wires?

Have you remove the valve cover to check for a broken or weak valve spring?

Have you checked the compression?

Thanks for asking your question and letting me try to help you.

If you are unable to rate my response GOOD or EXCELLENT now. Please let me know why ( if I need to help more) and when you will be able to.

Follow up/Reply as many times as needed before or after rating.

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Customer reply replied 1 year ago

yes plugs and wires and optispark are new.

have not removed valve cover yet but did a compression and got about 120 psi, how would i check valve spring being weak?

Another expert told me to check the vacuum system and said that if it checks ok then that should rule out any internal problems any truth?

Chevy Mechanic: Chris (aka-Moose), Technician replied 1 year ago

I see for some reason more information you wrote prior just showed up, so I asked questions you already answered, sorry.

A vacuum test will tell you if there is a valve issue. You want to see 12-18 in hg of vacuum at ht idle and you want to see it steady.

Compression is a little low, was that the reading on all cylinders?

You would use a hammer handle to push down on the valves when closed to see if this cylinder ones near it press down easier than the others.

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Customer reply replied 1 year ago

Could a bad sensor somewhere in the system cause a fault and give me the misfire? what are some sensors to be checking

Chevy Mechanic: Chris (aka-Moose), Technician replied 1 year ago

A sensor issue should store a trouble code and effect more cylinders. I do not believe a sensor is at fault here.

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Chevy Mechanic: Chris (aka-Moose), Technician replied 1 year ago

I like to stay in contact with my customers that appear not pleased, still working on the concern, or have not rated yet. I assume you were not pleased with my help. I hate that you have spent money to get an answer but left not happy. Can you tell me why, or can I help more. If its more help you need just reply and we can pick up where we left off.

Thanks Chris

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