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3.4 dohc miss fires. by ricksmastermix
Started on: 01-11-2019 05:42 PM
Replies: 4 (99 views)
Last post by: Dennis LaGrua on 02-12-2019 09:43 AM
ricksmastermix
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Report this Post01-11-2019 05:42 PM Click Here to See the Profile for ricksmastermixClick Here to visit ricksmastermix's HomePageClick Here to Email ricksmastermixSend a Private Message to ricksmastermixEdit/Delete MessageReply w/QuoteDirect Link to This Post

My 3.4 dohc 86 Fiero seems to idle OK, but as soon as I accelerate, it starts to miss fire on one or more cylinders.

It's cold outside, so I want to go out to garage with a troubleshooting plan. Any ideas?

Thanks.

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Daryl M
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Report this Post01-11-2019 10:28 PM Click Here to See the Profile for Daryl MClick Here to Email Daryl MSend a Private Message to Daryl MEdit/Delete MessageReply w/QuoteDirect Link to This Post

Rent a heated garage???
Sorry, I just had too.
Daryl

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msweldon
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Report this Post01-12-2019 11:03 AM Click Here to See the Profile for msweldonClick Here to Email msweldonSend a Private Message to msweldonEdit/Delete MessageReply w/QuoteDirect Link to This Post

Could be a failing ICM, coil pack(s), wires, or 7x CKP...
https://easyautodiagnostics...e-and-crank-sensor-1

OBD II or I LQ1? MAP sensor only or MAP and MAF? Any DTCs set?

Maybe check for a carbon fouled spark plug to locate the bad ignition circuit.

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ricksmastermix
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Report this Post02-09-2019 08:50 AM Click Here to See the Profile for ricksmastermixClick Here to visit ricksmastermix's HomePageClick Here to Email ricksmastermixSend a Private Message to ricksmastermixEdit/Delete MessageReply w/QuoteDirect Link to This Post

OBD I

I will check the plugs, coils and ICM first.
Thanks.

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Dennis LaGrua
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Report this Post02-12-2019 09:43 AM Click Here to See the Profile for Dennis LaGruaClick Here to Email Dennis LaGruaSend a Private Message to Dennis LaGruaEdit/Delete MessageReply w/QuoteDirect Link to This Post

 
quote
Originally posted by ricksmastermix:

OBD I

I will check the plugs, coils and ICM first.
Thanks.

Good first steps. Use a spark checker on each plug wire, check fuel pressure and fuel quality. Then scan to see if engine is running lean.

------------------
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