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I have a 2001 saturn l300 just had one of the two flex pipes replaced yesterday and the noise stopped and everything was however my check engine light came on so I brought it in and it said multiple misfires????? Wtf does this mean the guy said it cud be the plugs n cables or fuel pump or injector and that I shud buy cheapest first until problem stops...not best advice... I recently replaced the egr valve as well and that's y I had to replace flex pipe...the car runs good but stopping at a light it will vibrate not shake... besides the cat underneath what else is there filter wise? I wanna say the guy said fuel filter but wud it be underneath next to the cat? I don't think so? Someone heeeellllpp meee

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Posted on Jan 02, 2017

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SOURCE: I got a 99 tahoe 5.7 vortec with multiple misfires

this is one of those situations that a professional diag would of saved you alot of money. Its possible you just got bad gas and your injectors are partially clogged. An 02 sensor would not give multible misfires. EGR would only misfire at idle if stuck partially open since its suppose to be open cruising. Fuel filter would give you a starvation issue but if the misfires happens at idle then the filter most likley is ok.
Data from a professional data scanner will store the conditions when the misfire occurs. Also for a chevy each cylinder will have a misfire counter and one can see the misfire happening as it happens. If its idling and misfiring and gets better as you rev it up most likely you have clogged injectors or a intake vacuum leak. You can test for a intake leak by spraying the intake area with water(idle will faulter if it draws water in), or use brake cleaner (idle will raise when fluid gets drawn in).

If no leaks are found I would do an injection service or at least add two bottles of techron to a full tank, drve till half a tank then top off again.

Also if the catalytic converter is clogged the backpressure could cause all sorts of misfire issues. Removing the two upfront 02 sensors and driving will indicate the exhaust is clogged or not. We put a pressure sensor in place of the 02 sensor. If the pressure is above 5psi this would indicate some blockage. It should be below 3psi at 2000 rpm. Also if you have K/N filter the oil from it will coat the maf sensor wires in time,, (always). You can remove the sensor and spray the wires with brake cleaner to clean. DO NOT touch them. They can be brittle. Look at the wires for color. They should be shiny silver. If its coated the PCM will not see the air volume or accurately see the air temperature. Without this information the PCM will not add enough fuel which will create a misfire.

Posted on Jul 07, 2010

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SOURCE: Obd test says multiple misfires for my saturn l300

Sounds like its not firing on all cylinders. Try getting plugs replaced or have somebody put a timing light on it to see the cylinders is firing correctly!

Posted on Nov 01, 2012

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